CN215516406U - Novel double-trolley bridge crane - Google Patents

Abstract

A novel double-small-axle type crane comprises a bridge frame, wherein the bridge frame comprises an end beam, a cart travelling mechanism is assembled on the end beam, two ends of a main beam are fixed on the end beam, a main trolley and an auxiliary trolley are arranged above the main beam, the cart travelling mechanism comprises a cart first travelling wheel group and a cart second travelling wheel group, the cart first travelling wheel group and the cart second travelling wheel group respectively comprise cart travelling wheel frames, the cart travelling wheel frames are hinged below the end beam, cart travelling wheels are assembled on the cart travelling wheel frames, and a power output shaft of a cart travelling motor is fixedly connected with the cart travelling wheels; the main trolley comprises a main trolley frame, a main trolley travelling mechanism is arranged on the main trolley frame, and a main trolley lifting mechanism is arranged at the top end of the main trolley frame; the auxiliary trolley comprises an auxiliary trolley frame, an auxiliary trolley travelling mechanism is arranged on the auxiliary trolley frame, and an auxiliary trolley hoisting mechanism is arranged at the top end of the auxiliary trolley frame. The utility model has simple structure, can lift large-tonnage heavy objects and has stable operation.

Description

Novel double-trolley bridge crane

Technical Field

The utility model belongs to the technical field of crane equipment, and particularly relates to a novel double-small-axle type crane.

Background

A crane is a cyclic, intermittent motion machine primarily used for loading and unloading items, and a work cycle generally includes: the object taking device lifts the object from the object taking place by the lifting mechanism, the object is moved by the operation, rotation or amplitude variation mechanism, then the object is descended at the appointed place, and then the reverse motion is carried out, so that the object taking device is returned to the original position for the next working cycle. Between two duty cycles there is typically a brief pause. It follows that when the hoisting machine is operated, the mechanisms are often in a starting and braking state and a forward and reverse motion state which alternate with each other. The crane is an important hoisting device widely applied to various engineering constructions, and plays an important role in reducing labor intensity, saving manpower, reducing construction cost, improving labor productivity, accelerating construction speed and realizing engineering construction mechanization.

In some construction sites, a crane with a specific large tonnage is needed due to the fact that the lifted heavy object is heavy, a common single-beam bridge crane cannot meet working requirements, a crane walking mechanism of the existing crane mostly adopts a mode that two crane walking motors drive crane walking wheels to advance along a crane walking track, when the self weight of the crane is too large or the lifted heavy object is large, the phenomenon of skidding can occur between a driving wheel of the crane walking mechanism and the crane walking track, and the crane walking wheels at two ends of an end beam are easy to deflect due to the fact that the end beam is long, even can cause gnawing of the track, so that the structure of the existing large-tonnage bridge crane is unreasonable in arrangement.

SUMMERY OF THE UTILITY MODEL

The utility model provides a novel double-trolley bridge crane for solving the technical problem of unreasonable structure of the existing bridge crane, which comprises two cart travelling rails which are laid on a steel structure roof truss in parallel and symmetrically, a bridge frame is arranged above the cart travelling rails, the bridge frame comprises two end beams which are arranged in parallel and at intervals, the end beams play a supporting role, cart travelling mechanisms are respectively assembled on the end beams, the cart travelling mechanisms are assembled on the cart travelling rails, each cart travelling mechanism comprises two cart first travelling wheel sets and two cart second travelling wheel sets, the two cart first travelling wheel sets are respectively arranged below two ends of each end beam, the two cart second travelling wheel sets are respectively and symmetrically arranged below the middle of each end beam, each cart first travelling wheel set and each cart second travelling wheel set comprise cart travelling wheel carriers, the cart travelling wheel carriers are hinged below the end beams through flange plates, the cart walking wheel frames are all provided with cart walking wheels, cart walking motors are fixed on the cart walking wheel frames at the end parts of the two end beams, power output shafts of the cart walking motors are fixedly connected with cart walking wheels far away from the end beams in a coaxial line mode, and the cart walking motors drive cart walking wheels to walk along cart walking tracks. Be equipped with two girders between two end girders, the girder plays the supporting role, and the both ends of girder can be dismantled respectively through the ring flange and fix on the end girder, have all laid the dolly track of walking on two girders, and the girder top is equipped with main dolly and vice dolly, and main dolly and vice dolly all assemble on the dolly track of walking, and main dolly includes main dolly frame. The main trolley travelling mechanism is arranged on the main trolley frame and assembled on a trolley travelling track on a main beam, the main trolley travelling mechanism comprises a main trolley travelling wheel frame arranged at four corners below the main trolley frame, the middle of the upper end of the main trolley travelling wheel frame is hinged on the main trolley frame, main trolley travelling wheels are symmetrically assembled on the main trolley travelling wheel frame, main trolley travelling motors are arranged on two main trolley travelling wheel frames on the right side of the main trolley frame, power output shafts of the main trolley travelling motors are fixedly connected with main trolley travelling wheels corresponding to the main trolley travelling motors in a coaxial line mode, and the main trolley travelling motors drive main trolley travelling wheels to freely move along the trolley travelling track. The top of main trolley frame is equipped with main trolley hoisting mechanism, main trolley hoisting mechanism includes the main trolley reel that the level set up, the top at the main trolley frame is fixed through the bearing frame is rotatable at the both ends of main trolley reel, main trolley hoisting motor is fixed with on the other main trolley frame top of main trolley reel, be equipped with the main trolley reduction gear between main trolley hoisting motor and the main trolley reel, main trolley hoisting motor passes through the main trolley reduction gear and is connected with the main trolley reel, the below of main trolley reel is equipped with the main lifting hook, the main lifting hook passes through wire rope and connects on the main trolley reel, main trolley hoisting motor drives the main trolley reel and rotates, the main trolley reel drives the main lifting hook through wire rope and hangs the heavy object in vertical direction. The auxiliary trolley comprises an auxiliary trolley frame, an auxiliary trolley travelling mechanism is arranged on the auxiliary trolley frame and comprises auxiliary trolley travelling wheels assembled at four corners of the auxiliary trolley frame, the auxiliary trolley travelling wheels are assembled on a trolley travelling track at the upper end of the main beam, an auxiliary trolley travelling motor is arranged at the left end of the auxiliary trolley frame close to the auxiliary trolley travelling wheels, a power output shaft of the auxiliary trolley travelling motor is fixedly connected with the auxiliary trolley travelling wheels at the left end of the auxiliary trolley frame in a coaxial line mode, and the auxiliary trolley travelling motor drives the auxiliary trolley travelling wheels to freely move along the trolley travelling track. The top of vice dolly frame is equipped with vice dolly hoisting mechanism, vice dolly hoisting mechanism includes the vice dolly reel that the level set up, the top at vice dolly reel is passed through the bearing frame rotatable fixation at the top of vice dolly frame in the both ends of vice dolly reel, vice dolly reel other vice dolly frame top is fixed with vice dolly and plays to rise the motor, be equipped with vice dolly reduction gear between vice dolly plays to rise motor and the vice dolly reel, vice dolly plays to rise the motor and is connected with vice dolly reel through vice dolly reduction gear, the below of vice dolly reel is equipped with vice lifting hook, vice lifting hook passes through wire rope and connects on vice dolly reel, vice dolly plays to rise the motor and drives vice dolly reel rotation, vice dolly reel drives vice lifting hook through wire rope and lifts by crane the heavy object.

Preferably, the cart walking wheel frames below the two ends of the end beam are respectively provided with a cart buffer, and the cart buffers play a role in buffering.

Preferably, the anti-collision limiting devices which are horizontally arranged are fixed on the main trolley walking wheel carriers on the right side of the main trolley, the anti-collision limiting devices are arranged to play a limiting role, and the main trolley and the auxiliary trolley are prevented from colliding.

Preferably, a cart guard rail is arranged on the bridge; a main trolley protective guard is arranged on the frame of the main trolley; and an auxiliary trolley protective guard is arranged on the auxiliary trolley frame.

Preferably, both sides of the main trolley speed reducer are provided with main trolley brakes, and the main trolley brakes play a role in emergency braking on a main trolley winding drum; and auxiliary trolley brakes are arranged on two sides of the auxiliary trolley speed reducer and play a role in emergency braking on auxiliary trolley winding drums.

Preferably, the cart walking motor, the main trolley walking motor, the auxiliary trolley walking motor, the main trolley lifting motor, the auxiliary trolley lifting motor, the main trolley brake, the auxiliary trolley brake and the anti-collision limiter are all connected with a power supply through cables, and the cart walking motor, the main trolley walking motor, the auxiliary trolley walking motor, the main trolley lifting motor, the main trolley brake, the auxiliary trolley lifting motor and the anti-collision limiter are all connected with the PLC through cables.

The scheme has the following advantages:

the cart travelling mechanism is provided, and the cart travelling motors are arranged at two ends of each end beam, so that the cart travelling mechanism is provided with four driving wheels, the slippage between the driving wheels and a cart travelling track is reduced, the transmission efficiency is enhanced, and meanwhile, the cart second travelling wheel group arranged in the middle of the end beam enhances the travelling stability of the crane; the main trolley can be used for hoisting heavy goods, the auxiliary trolley can be used for hoisting light goods, and the working efficiency can be improved and the energy can be saved by matching the main trolley and the auxiliary trolley; the arrangement of the cart buffer has a buffering effect on the bridge; the anti-collision limiting device has an anti-collision effect on the main trolley and the auxiliary trolley; the main trolley brake plays an emergency braking role on the main trolley winding drum, and the auxiliary trolley brake plays an emergency braking role on the auxiliary trolley winding drum.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic top view of the present invention;

FIG. 3 is a left side view of the present invention;

FIG. 4 is a schematic view of the main cart;

FIG. 5 is a schematic top view of the main cart;

FIG. 6 is a left side view schematic diagram of the main cart;

FIG. 7 is a schematic view of the structure of the auxiliary trolley;

FIG. 8 is a schematic top view of the auxiliary trolley;

fig. 9 is a left side view structural schematic diagram of the auxiliary trolley.

Reference numerals: 1. a steel structure roof truss; 2. a bridge frame; 3. a cart traveling mechanism; 4. a main trolley; 5. a secondary trolley; 6. a wire rope; 11. a cart walking track; 21. an end beam; 22. a main beam; 23. a trolley walking track; 24. a cart guard rail; 31. a cart first travelling wheel set; 32. a second traveling wheel set of the cart; 33. a cart traveling wheel carrier; 34. a cart travelling wheel; 35. a cart traveling motor; 36. a cart bumper; 41. a main trolley frame; 42. a main trolley travelling mechanism; 421. the main trolley walking wheel carrier; 422. a main trolley travelling wheel; 423. an anti-collision stopper; 424. a main trolley traveling motor; 43. a main trolley hoisting mechanism; 431. a main trolley winding drum; 432. a main trolley lifting motor; 433. a main trolley speed reducer; 44. a main lifting hook; 45. a main trolley brake; 46. a main trolley guard rail; 51. a sub-trolley frame; 52. a secondary trolley travelling mechanism; 521. a travelling wheel of the auxiliary trolley; 53. a secondary trolley traveling motor; 54. a lifting mechanism of the auxiliary trolley; 541. a secondary trolley winding drum; 542. a secondary trolley lifting motor; 543. a subsidiary trolley speed reducer; 544. a secondary lifting hook; 55. a sub-trolley brake; 56. and a subsidiary trolley guardrail.

Detailed Description

As shown in fig. 1-9, a novel double small axle type crane comprises two large car running rails 11 laid in parallel and symmetrically on a steel structure roof truss 1, a bridge frame 2 is arranged above the large car running rails 11, the bridge frame 2 comprises two end beams 21 arranged in parallel and at intervals, the end beams 21 play a supporting role, the end beams 21 are respectively provided with a large car running mechanism 3, the large car running mechanisms 3 are assembled on the large car running rails 11, the large car running mechanism 3 comprises two large car first running wheel sets 31 and two large car second running wheel sets 32, the two large car first running wheel sets 31 are respectively arranged below two ends of the end beams 21, the two large car second running wheel sets 32 are respectively and symmetrically arranged below the middle of the end beams 21, the large car first running wheel sets 31 and the large car second running wheel sets 32 both comprise large car running wheel frames 33, the large car running wheel frames 33 are hinged below the end beams 21 through flanges, the cart travelling wheels 34 are assembled on the cart travelling wheel frames 33, cart travelling motors 35 are fixed on the cart travelling wheel frames 33 at the end parts of the two end beams 21, power output shafts of the cart travelling motors 35 are fixedly connected with cart travelling wheels 34 far away from the end beams 21 in a coaxial line mode, and the cart travelling motors 35 drive the cart travelling wheels 34 to travel along the cart travelling rails 11. Be equipped with two girders 22 between two end beams 21, girder 22 plays the supporting role, and the both ends of girder 22 can be dismantled through the ring flange respectively and fix on end beam 21, have all laid dolly walking track 23 on two girders 22, and girder 22 top is equipped with main dolly 4 and vice dolly 5, and main dolly 4 and vice dolly 5 all assemble on dolly walking track 23, and main dolly 4 includes main dolly frame 41. The main trolley travelling mechanism 42 is arranged on the main trolley frame 41, the main trolley travelling mechanism 42 is assembled on the trolley travelling rail 23 on the main beam 22, the main trolley travelling mechanism 42 comprises main trolley travelling wheel frames 421 arranged at four corners below the main trolley frame 41, the middle of the upper ends of the main trolley travelling wheel frames 421 is hinged on the main trolley frame 41, main trolley travelling wheels 422 are symmetrically assembled on the main trolley travelling wheel frames 421, main trolley travelling motors 424 are arranged on the two main trolley travelling wheel frames 421 on the right side of the main trolley frame 41, power output shafts of the main trolley travelling motors 424 are coaxially and fixedly connected with the corresponding main trolley travelling wheels 422, and the main trolley travelling motors 424 drive the main trolley travelling wheels 422 to freely move along the trolley travelling rail 23. The top end of the main trolley frame 41 is provided with a main trolley hoisting mechanism 43, the main trolley hoisting mechanism 43 comprises a main trolley winding drum 431 which is horizontally arranged, two ends of the main trolley winding drum 431 are rotatably fixed on the top end of the main trolley frame 41 through bearing seats, a main trolley hoisting motor 432 is fixed on the top end of the main trolley frame 41 beside the main trolley winding drum 431, a main trolley speed reducer 433 is arranged between the main trolley hoisting motor 432 and the main trolley winding drum 431, the main trolley hoisting motor 432 is connected with the main trolley winding drum 431 through the main trolley speed reducer 433, a main hoisting hook 44 is arranged below the main trolley winding drum 431, the main hoisting hook 44 is connected onto the main trolley winding drum 431 through a steel wire rope 6, the main trolley hoisting motor 432 drives the main trolley winding drum 431 to rotate, and the main trolley winding drum 431 drives the main hoisting hook 44 to hoist a heavy object in the vertical direction through the steel wire rope 6. The auxiliary trolley comprises an auxiliary trolley frame 51, an auxiliary trolley travelling mechanism 52 is arranged on the auxiliary trolley frame 51, the auxiliary trolley travelling mechanism 52 comprises auxiliary trolley travelling wheels 521 assembled at four corners of the auxiliary trolley frame 51, the auxiliary trolley travelling wheels 521 are assembled on a trolley travelling rail 23 at the upper end of the main beam 22, an auxiliary trolley travelling motor 53 is arranged at the left end of the auxiliary trolley frame 51 close to the auxiliary trolley travelling wheels 521, a power output shaft of the auxiliary trolley travelling motor 53 is coaxially and fixedly connected with the auxiliary trolley travelling wheel 521 at the left end of the auxiliary trolley frame 51, and the auxiliary trolley travelling motor 53 drives the auxiliary trolley travelling wheels 521 to freely move along the trolley travelling rail 23. The top end of the auxiliary trolley frame 51 is provided with an auxiliary trolley hoisting mechanism 54, the auxiliary trolley hoisting mechanism 54 comprises an auxiliary trolley winding drum 541 horizontally arranged, two ends of the auxiliary trolley winding drum 541 are rotatably fixed on the top end of the auxiliary trolley frame 51 through bearing seats, an auxiliary trolley hoisting motor 542 is fixed on the top end of the auxiliary trolley frame 51 beside the auxiliary trolley winding drum 541, an auxiliary trolley speed reducer 543 is arranged between the auxiliary trolley hoisting motor 542 and the auxiliary trolley winding drum 541, the auxiliary trolley hoisting motor 542 is connected with the auxiliary trolley winding drum 541 through the auxiliary trolley speed reducer 543, an auxiliary hoisting hook 544 is arranged below the auxiliary trolley winding drum 541, the auxiliary hoisting hook 544 is connected onto the auxiliary trolley winding drum 541 through a steel wire rope 6, the auxiliary trolley hoisting motor 542 drives the auxiliary trolley winding drum 541 to rotate, and the auxiliary trolley winding drum 541 drives the auxiliary hoisting hook 544 to hoist heavy objects through the steel wire rope 6.

Preferably, the cart running wheel frames 33 below the two ends of the end beam 21 are respectively provided with a cart buffer 36, and the cart buffers 36 play a role in buffering.

Preferably, the anti-collision stoppers 423 horizontally arranged are fixed on the main trolley walking wheel frames 421 on the right side of the main trolley 4, and the anti-collision stoppers 423 play a role in limiting, so that the main trolley 4 and the auxiliary trolley 5 are prevented from colliding.

Preferably, a cart guard rail 24 is arranged on the bridge frame 2; a main trolley protective guard 46 is arranged on the main trolley frame 41; the auxiliary trolley frame 51 is provided with an auxiliary trolley guard rail 56.

Preferably, both sides of the main trolley reducer 433 are equipped with main trolley brakes 45, and the main trolley brakes 45 play an emergency braking role for the main trolley winding drum 431; the auxiliary trolley brakes 55 are respectively arranged on two sides of the auxiliary trolley speed reducer 543, and the auxiliary trolley brakes 55 play an emergency braking role for the auxiliary trolley winding drum 541.

Preferably, the cart traveling motor 35, the main cart traveling motor 424, the auxiliary cart traveling motor 53, the main cart lifting motor 432, the auxiliary cart lifting motor 542, the main cart brake 45, the auxiliary cart brake 55 and the anti-collision stopper 423 are all connected with a power supply through cables, and the cart traveling motor 35, the main cart traveling motor 424, the auxiliary cart traveling motor 53, the main cart lifting motor 432, the main cart brake 45, the auxiliary cart brake 55, the auxiliary cart lifting motor 542 and the anti-collision stopper 423 are all connected with a PLC controller through cables.

The use process comprises the following steps:

when the crane is used, the cart travelling mechanism 3 drives the bridge frame 2 to move along the cart travelling rail 11, the cart travelling motor 35 drives the cart travelling wheel 34 to roll along the cart travelling rail 11, the cart travelling mechanism 3 drives the bridge frame 2 to move right above a heavy object to be hoisted, a main trolley 4 or an auxiliary trolley 5 is selected according to the mass of the heavy object, the main trolley 4 is selected when the mass of the heavy object is large, the main trolley hoisting motor 432 is started, the main trolley hoisting motor 432 drives the main trolley winding drum 431 to rotate, the main trolley winding drum 431 drives the main hoisting hook 44 to hoist the heavy object through the steel wire rope 6, the main trolley travelling mechanism 42 is started, the main trolley 4 freely moves along the trolley travelling rail 23 on the main beam 22, and the heavy object is moved to a designated position through the cart travelling mechanism 3 and the main trolley travelling mechanism 42 to be unloaded; when the weight of the heavy object is lighter, the auxiliary trolley 5 is selected, the auxiliary trolley lifting motor 542 is started, the auxiliary trolley lifting motor 542 drives the auxiliary trolley winding drum 541 to rotate, the auxiliary trolley winding drum 541 drives the auxiliary lifting hook 544 to lift the heavy object through the steel wire rope 6, the auxiliary trolley travelling mechanism 52 is started, the auxiliary trolley 5 freely moves along the trolley travelling track 23 on the main beam 22, and the heavy object is moved to a specified position to be unloaded through the trolley travelling framework 3 and the auxiliary trolley travelling mechanism 52.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "horizontal", "vertical", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.

Claims (10)

1. The utility model provides a novel two little axle cranes, including two parallels and the cart walking track of symmetry laying on steel construction roof truss, cart walking orbital top is equipped with the crane span structure, the crane span structure includes the end beam that two parallels and interval set up, all be equipped with cart running gear on the end beam, cart running gear assembles on cart walking track, be equipped with two girders between two end beams, the both ends of girder can be dismantled respectively through the ring flange and fix on the end beam, dolly walking track has all been laid on two girders, its characterized in that: the main beam is provided with a main trolley and an auxiliary trolley, the main trolley and the auxiliary trolley are assembled on a trolley travelling track, the trolley travelling mechanism comprises two trolley first travelling wheel groups and two trolley second travelling wheel groups, the two trolley first travelling wheel groups are respectively arranged below two ends of the end beam, the two trolley second travelling wheel groups are respectively and symmetrically arranged below the middle of the end beam, the trolley first travelling wheel groups and the trolley second travelling wheel groups respectively comprise trolley travelling wheel frames, the trolley travelling wheel frames are hinged below the end beam through flange plates, the trolley travelling wheel frames are respectively assembled with trolley travelling wheels, the trolley travelling wheel frames at the end parts of the two end beams are respectively fixed with a trolley travelling motor, and a power output shaft of the trolley travelling motor is coaxially and fixedly connected with the trolley travelling wheels far away from the end beam; the main trolley comprises a main trolley frame, a main trolley travelling mechanism is arranged on the main trolley frame, the main trolley travelling mechanism is assembled on a trolley travelling track on the main beam, and a main trolley hoisting mechanism is arranged at the top end of the main trolley frame; the auxiliary trolley comprises an auxiliary trolley frame, an auxiliary trolley travelling mechanism is arranged on the auxiliary trolley frame, and an auxiliary trolley hoisting mechanism is arranged at the top end of the auxiliary trolley frame.

2. The novel double-trolley axle type crane according to claim 1, wherein the main trolley traveling mechanism comprises main trolley traveling wheel frames arranged at four corners below the main trolley frame, the middle of the upper ends of the main trolley traveling wheel frames are hinged on the main trolley frame, main trolley traveling wheels are symmetrically assembled on the main trolley traveling wheel frames, main trolley traveling motors are arranged on the two main trolley traveling wheel frames on the right side of the main trolley frame, and power output shafts of the main trolley traveling motors are coaxially and fixedly connected with the corresponding main trolley traveling wheels.

3. A novel double-trolley axle type crane as claimed in claim 2, wherein the main trolley hoisting mechanism comprises a horizontally arranged main trolley winding drum, two ends of the main trolley winding drum are rotatably fixed at the top end of the main trolley frame through bearing seats, a main trolley hoisting motor is fixed at the top end of the main trolley frame beside the main trolley winding drum, a main trolley speed reducer is arranged between the main trolley hoisting motor and the main trolley winding drum, the main trolley hoisting motor is connected with the main trolley winding drum through the main trolley speed reducer, a main hoisting hook is arranged below the main trolley winding drum, and the main hoisting hook is connected to the main trolley winding drum through a steel wire rope.

4. A novel double-trolley axle type crane as claimed in claim 3, wherein the auxiliary trolley travelling mechanism comprises auxiliary trolley travelling wheels assembled at four corners of the auxiliary trolley frame, the auxiliary trolley travelling wheels are assembled on trolley travelling rails at the upper end of the main beam, an auxiliary trolley travelling motor is arranged at the left end of the auxiliary trolley frame close to the auxiliary trolley travelling wheels, and a power output shaft of the auxiliary trolley travelling motor is fixedly connected with the auxiliary trolley travelling wheels at the left end of the auxiliary trolley frame in a coaxial manner.

5. A novel double-trolley axle type crane as claimed in claim 4, wherein the auxiliary trolley hoisting mechanism comprises an auxiliary trolley winding drum horizontally arranged, two ends of the auxiliary trolley winding drum are rotatably fixed at the top end of an auxiliary trolley frame through bearing seats, an auxiliary trolley hoisting motor is fixed at the top end of the auxiliary trolley frame beside the auxiliary trolley winding drum, an auxiliary trolley speed reducer is arranged between the auxiliary trolley hoisting motor and the auxiliary trolley winding drum, the auxiliary trolley hoisting motor is connected with the auxiliary trolley winding drum through the auxiliary trolley speed reducer, an auxiliary hoisting hook is arranged below the auxiliary trolley winding drum, and the auxiliary hoisting hook is connected to the auxiliary trolley winding drum through a steel wire rope.

6. A novel double small axle type crane as claimed in claim 5, wherein the large car buffers are arranged on the large car walking wheel frames below the two ends of the end beam.

7. The novel double-small-axle type crane as claimed in claim 6, wherein the horizontally arranged anti-collision stoppers are fixed on the main trolley traveling wheel carriers on the right side of the main trolley.

8. The novel double small axle type crane as claimed in claim 7, wherein the bridge frame is provided with a cart guard rail; a main trolley protective guard is arranged on the frame of the main trolley; and an auxiliary trolley protective guard is arranged on the auxiliary trolley frame.

9. The novel double small axle type crane as claimed in claim 8, wherein the main trolley brake is mounted on both sides of the main trolley reducer; and auxiliary trolley brakes are respectively assembled on two sides of the auxiliary trolley speed reducer.

10. The novel double-trolley axle type crane according to claim 9, wherein the cart traveling motor, the main trolley traveling motor, the auxiliary trolley traveling motor, the main trolley lifting motor, the auxiliary trolley lifting motor, the main trolley brake, the auxiliary trolley brake and the anti-collision stopper are all connected with a power supply through cables, and the cart traveling motor, the main trolley traveling motor, the auxiliary trolley traveling motor, the main trolley lifting motor, the main trolley brake, the auxiliary trolley lifting motor and the anti-collision stopper are all connected with a PLC (programmable logic controller) through cables.

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