Double-beam crane with crane carriage convenient to maintain

Abstract

The invention relates to a double-beam crane with a crane carriage convenient to maintain, which comprises two groups of longitudinal main beams on the double-beam crane, rails with I-shaped sections are welded and fixed on the lower end surfaces of the main beams, a horizontal bearing table is arranged below the space between the rails, and a plurality of vertical connecting columns are fixed on the lower end surface of the bearing table. The lower end of the connecting column is fixedly connected with a winch unit; a front bearing plate and a rear bearing plate which are staggered are arranged above the bearing table, transverse guide rails are formed on the lower end faces of the front sides and the rear sides of the bearing plates respectively, the two ends of each guide rail abut against limiting end blocks respectively, the limiting end blocks are welded and fixed to the bearing plates, a sliding base is fixedly connected to the portion, between the limiting end blocks, of the bearing table, and the guide rails are inserted into the sliding base. The hoisting trolley of the double-beam crane is provided with the lifting structure, so that the traveling wheels can be conveniently separated from the guide rails, and the traveling wheels can be replaced and maintained on the double-beam crane without hoisting the hoisting trolley to the ground to replace the wheels.

Description

Technical fields:

[0001] This invention relates to the technical field of double-girder cranes, and more specifically to a double-girder crane with a convenient-to-maintain lifting trolley. Background technology:

[0002] Double-girder cranes (also known as double-girder overhead cranes) are a type of lifting equipment widely used in industrial fields. They consist of two parallel main beams forming a bridge, equipped with a hoisting mechanism, a traveling mechanism, and a control system. The conventional structure of the hoisting mechanism is a winch unit, and the conventional structure of the traveling mechanism is a crane-traveling trolley, with the winch unit fixedly connected to the crane-traveling trolley. Existing double-girder cranes include two main beams, with I-beam steel rails fixedly connected to the bottom of the main beams. The crane-traveling trolley is connected to the rails via traveling wheels (including drive wheels and driven wheels) and moves along the rails. However, double-girder cranes inevitably experience malfunctions during use, especially when the traveling wheels of the crane-traveling trolley fail. The current maintenance method involves disassembling the crane-traveling trolley from the main beams and then hoisting it to the ground using other lifting equipment for replacement and repair. The entire maintenance process is very troublesome, especially for small businesses with limited space where large lifting equipment cannot be accessed. Not only is disassembly and reassembly difficult, but it also seriously affects their production. Therefore, for small and medium-sized double-girder cranes in small businesses, a structure that facilitates the replacement and maintenance of wheels is needed. Summary of the Invention:

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a double-girder crane with a convenient trolley for maintenance. The trolley of the double-girder crane is equipped with a lifting structure, which facilitates the removal of the traveling wheels from the guide rails. This eliminates the need to hoist the trolley to the ground to replace the wheels, allowing the replacement and maintenance of the traveling wheels to be performed directly on the double-girder crane.

[0004] A double-girder crane with an easy-to-maintain lifting trolley includes two sets of longitudinal main beams. A track with an "I"-shaped cross-section is welded and fixed to the lower end face of each main beam. A horizontal support platform is located below the track. Several vertical connecting columns are fixed to the lower end face of the support platform, and a winch unit is fixed to the lower end of each connecting column. Above the support platform are two sets of staggered support plates, front and rear. Transverse guide rails are formed on the lower end faces of the front and rear sides of the support plates. The two ends of the guide rails abut against limit blocks, which are welded and fixed to the support plates. A slide block is fixed to the support platform between the limit blocks, and the guide rail is inserted into the slide block. Several vertical fastening bolts are inserted into the support platform, and the upper ends of the fastening bolts are screwed and fixed inside the limit blocks.

[0005] Two sets of support plates are respectively fixed with oppositely oriented travel drive motors. The shafts of the travel drive motors pass through the side support plate inserts and are fixed with drive gears. Drive gears mesh with drive gears. Drive gears are connected to T-shaped drive shafts via keys. Drive shafts are connected to the side support plates via bearings. Drive wheels are connected to the drive shafts via keys. The end of the drive shaft extends out of the drive wheel and is screwed to a limit sleeve. Drive wheels are distributed at one end of the side support plate and driven wheels are provided at the other end of the side support plate. Drive wheels are connected to driven shafts via bearings. Drive shafts are inserted and fixed to the side support plates. The side support plates are respectively fixed to the sides of the two sets of support plates near the track. The drive wheels and driven wheels abut against the lower bottom surface of the inner side of the track.

[0006] The two sets of bearing plates are each formed with a transverse guide groove. Four vertical angle irons are inserted into the guide grooves, each distributed at one of the four corners of a rectangle. The lower end of the angle irons is welded and fixed to the bearing platform, and the upper end extends out of the upper surface of the main beam and is fixed to a horizontal top plate. A horizontal rectangular lifting frame is inserted between the two sets of main beams. The four corners of the lifting frame abut against the inner side wall of the angle iron. The upper and lower end surfaces of the lifting frame are respectively fixed with longitudinal lifting plates. A vertical screw is inserted and fixed in the middle of the lifting plate. The upper end of the screw passes through the top plate and is screwed to a handwheel, which abuts against the upper surface of the top plate.

[0007] The lifting frame has two sets of obliquely placed support arms on the left and right sides of the frame, respectively. One end of the support arm is formed with a vertical stud. The stud passes through the lifting frame and is fitted with a torsion spring. One end of the torsion spring is inserted and fixed to the lifting frame, and the other end is inserted and fixed to the stud. A limit sleeve is screwed and fixed on the stud on the upper side of the torsion spring. The other end of the support arm is formed with a vertical support shaft. The support shaft is connected to a guide wheel through a bearing. The guide wheel elastically presses against the inner side wall of the two sets of main beams.

[0008] Preferably, the diameter of the driven wheel is equal to the diameter of the driving wheel, and the diameter of the driven wheel is less than the distance from the top plate to the main beam.

[0009] Preferably, the stud and the support shaft are both located on the upper side of the support arm, and the length of the support arm is greater than the horizontal distance from the lifting frame to the main beam.

[0010] Preferably, the distance from the side of the support plate away from the track to the track is greater than the length of the driven wheel and the driving wheel.

[0011] Preferably, the lower end face of the side support plate is flush with the upper end face of the bearing plate, and a vertical reinforcing bolt is screwed onto the side support plate at one end of the driven wheel, and the reinforcing bolt is inserted into the bearing platform.

[0012] Preferably, the main beam has a rectangular cross-section, and the distance between the upper and lower bottom surfaces inside the track is greater than the diameter of the driven wheel and the driving wheel.

[0013] Preferably, the head of the drive shaft abuts against the inner wall of the side support plate, and a bushing is inserted into the drive shaft between the outer wall of the side support plate and the driven gear.

[0014] The beneficial effects of this invention are as follows:

[0015] The trolley of this double-girder crane is equipped with a lifting structure, which makes it easy for the traveling wheels to be removed from the guide rail. Therefore, it is not necessary to lift the trolley to the ground to change the wheels. The replacement and maintenance of the traveling wheels can be carried out on the double-girder crane itself. Attached image description:

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 for Figure 1 Schematic diagram of the cross section at point AA;

[0018] Figure 3 for Figure 1 Schematic diagram of the cross section at point BB;

[0019] Figure 4 for Figure 1 A cross-sectional view at point CC.

[0020] In the diagram: 1. Main beam; 2. Track; 3. Support platform; 4. Connecting column; 5. Winch unit; 6. Support plate; 7. Limiting end block; 8. Fastening bolt; 9. Guide rail; 10. Slide block; 11. Side support plate; 12. Travel drive motor; 13. Drive gear; 14. Driven gear; 15. Drive shaft; 16. Drive wheel; 17. Limiting sleeve; 18. Driven shaft; 19. Driven wheel; 20. Angle iron; 21. Lifting frame; 22. Top plate; 23. Lifting plate; 24. Lead screw; 25. Handwheel; 26. Support arm; 27. Guide wheel. Detailed implementation method:

[0021] Example: See Figures 1 to 4As shown, a double-girder crane with a convenient lifting trolley includes two sets of longitudinal main beams 1 on the double-girder crane. A track 2 with an "I"-shaped cross-section is welded and fixed to the lower end face of the main beam 1. A horizontal bearing platform 3 is provided below the track 2. Several vertical connecting columns 4 are fixed to the lower end face of the bearing platform 3, and a winch unit 5 is fixed to the lower end of the connecting columns 4. Above the bearing platform 3, there are two sets of staggered bearing plates 6. Transverse guide rails 9 are formed on the lower end faces of the front and rear sides of the bearing plates 6. The two ends of the guide rails 9 abut against limit blocks 7, which are welded and fixed to the bearing plates 6. A slide block 10 is fixed to the bearing platform 3 between the limit blocks 7, and the guide rails 9 are inserted into the slide block 10. Several vertical fastening bolts 8 are inserted into the bearing platform 3, and the upper ends of the fastening bolts 8 are screwed and fixed inside the limit blocks 7.

[0022] Two sets of support plates 6 are respectively fixed with oppositely oriented travel drive motors 12. The shafts of the travel drive motors 12 pass through the side support plates 11 and are fixed with drive gears 13. Driven gears 14 mesh with the drive gears 13. Driven gears 14 are connected to T-shaped drive shafts 15 by keys. Drive shafts 15 are connected to the side support plates 11 by bearings. Drive wheels 16 are connected to the drive shafts 15 by keys. The end of the drive shafts 15 extends out of the drive wheels 16 and is screwed with a limit sleeve 17. Drive wheels 16 are distributed at one end of the side support plates 11, and driven wheels 19 are provided at the other end of the side support plates 11. Driven wheels 19 are connected to driven shafts 18 by bearings. Driven shafts 18 are inserted and fixed to the side support plates 11. The side support plates 11 are respectively fixed to the sides of the two sets of support plates 6 near the track 2. Figure 3 As shown, the left side support plate 11 is fixed to the right side of the front bearing plate 6, and the right side support plate 11 is fixed to the left side of the rear bearing plate 6; the drive wheel 16 and the driven wheel 19 respectively abut against the lower bottom surface of the inner side of the track 2.

[0023] The two sets of bearing plates 6 are each formed with a transverse guide groove 61. Four vertical angle irons 20, each arranged at one of the four corners of a rectangle, are inserted into the guide groove 61. The lower ends of the angle irons 20 are welded and fixed to the bearing platform 3, and the upper ends extend beyond the upper surface of the main beam 1 and are fixedly connected to a horizontal top plate 22. A horizontal rectangular lifting frame 21 is inserted between the two sets of main beams 1, with the four corners of the lifting frame 21 abutting against the inner walls of the angle irons 20. Longitudinal... The lifting plate 23 has a vertical screw 24 (multiple screws 24 can be installed to distribute the force) inserted and fixed in the middle. The upper end of the screw 24 passes through the top plate 22 and is screwed to a handwheel 25, which rests against the upper surface of the top plate 22. Different sizes of double-girder cranes use different sizes of lifting trolleys. When the weight of the lifting trolley is heavy, multiple screws 24 can be installed. At the same time, a long steel pipe can be inserted into the handwheel 25 to drive the handwheel 25 to rotate by leveraging the force of the long steel pipe.

[0024] The lifting frame 21 has two sets of obliquely placed support arms 26 on the left and right sides of the frame, respectively. One end of the support arm 26 is formed with a vertical stud 261. The stud 261 passes through the lifting frame 21 and is fitted with a torsion spring. One end of the torsion spring is inserted and fixed to the lifting frame 21, and the other end is inserted and fixed to the stud 261. A limit sleeve 262 is screwed and fixed on the stud 261 on the upper side of the torsion spring. The other end of the support arm 26 is formed with a vertical support shaft 263. The support shaft 263 is connected to a 27 through a bearing. The guide wheel 27 is elastically pressed against the inner side wall of the two sets of main beams 1.

[0025] The diameter of the driven wheel 19 is equal to the diameter of the driving wheel 16. The diameter of the driven wheel 19 is less than the distance from the top plate 22 to the main beam 1. Therefore, the driven wheel 19 and the driving wheel 16 can move below the track 2 after leaving the track 2 during the descent of the top plate 22.

[0026] The stud 261 and the support shaft 263 are both located on the upper side of the support arm 26. The length of the support arm 26 is greater than the horizontal distance from the lifting frame 21 to the main beam 1. Normally, the support arm 26 is used as a tensioning arm to guide the movement of the crane trolley. When the support arm 26 moves upward and separates from the main beam 1, it is subjected to the action of the torsion spring. The support arms 26 on both sides of the lifting frame 21 rotate and abut together, so that the end of the support arm 26 is positioned directly above the main beam 1. Thus, the support arm 26 is used as a support foot to assist the crane trolley in moving up and down.

[0027] The distance from the side of the support plate 6 away from the track 2 to the track 2 is greater than the length of the driven wheel 19 and the drive wheel 16. Therefore, after removing the fastening bolts, the support plate 6 can be moved to allow the driven wheel 19 and the drive wheel 16 to disengage from the track 2.

[0028] The lower end face of the side support plate 11 is flush with the upper end face of the bearing plate 6. A vertical reinforcing bolt is screwed onto the side support plate 11 at one end of the driven wheel 19. The reinforcing bolt is inserted into the bearing platform 3. When the crane trolley is working normally, the reinforcing bolt strengthens the connection between the side support plate 11 and the bearing platform 3, and improves the stability of operation. When it is necessary to disassemble and replace the driven wheel 19 or the drive wheel 16, the reinforcing bolt needs to be removed.

[0029] The main beam 1 has a rectangular cross-section, and the distance between the upper and lower bottom surfaces of the inner side of the track 2 is greater than the diameter of the driven wheel 19 and the driving wheel 16.

[0030] The head of the drive shaft 15 abuts against the inner side wall of the side support plate 11. A bushing is inserted on the drive shaft 15 between the outer side wall of the side support plate 11 and the driven gear 14. When disassembling the drive wheel 16, the drive shaft 15 does not move axially outward due to the head being limited. After removing the limiting sleeve 17, it is convenient to remove the drive wheel 16 from the drive shaft 15.

[0031] Working principle: This structure is a double-girder crane with a convenient lifting trolley for maintenance. Its technical solution is specifically embodied in the lifting trolley, such as... Figure 1 As shown, the traveling wheels (including drive wheels 16 and driven wheels 19) on the crane trolley are connected to the track 2. The drive wheels 16 are driven to rotate by the travel drive motor 12, so that they can move on the track 2. At the same time, the structure above the travel drive motor 12 is provided with multiple sets of support arms 26 and guide wheels 27, which can assist the movement of the crane trolley and avoid jamming or disengagement caused by the deviation of the traveling wheels during movement, thus effectively improving the stability of the crane trolley operation.

[0032] Simultaneously, when the traveling wheels malfunction and require replacement or repair, rotating the handwheel 25 drives the lead screw 24 upward, which in turn drives the support arm 26 upward. Once the support arm 26 is detached from the main beam 1, it can open. Then, rotating the handwheel 25 in the opposite direction allows the support arm 26 to support and abut against the main beam 1, enabling the top plate 22, angle iron 20, and bearing platform 3 to move upward. Consequently, the drive wheel 16 and driven wheel 19 can move upward and no longer press against the track 2. Next, removing the fastening bolts 8 allows the bearing plate 6 to be pushed horizontally, enabling the drive wheel 16 and driven wheel 19 to move laterally and detach from the track 2. Then, changing the rotation direction of the handwheel 25 causes the bearing platform 3 to move downward. Thus, when the drive wheel 16 and driven wheel 19 are moved below the track 2, they can be disassembled and replaced.

[0033] The drive wheel 16 can be replaced by removing the limit sleeve 17. The driven wheel 19 can be removed using a puller, and then a new driven wheel 19 can be installed.

[0034] The embodiments described are illustrative of the invention and are not intended to limit the invention. Any person skilled in the art can modify the embodiments without departing from the spirit and scope of the invention; therefore, the scope of protection of the invention should be as set forth in the claims.

Claims

1. A double-girder crane with an easily maintainable lifting trolley, comprising two sets of longitudinal main beams (1) on the double-girder crane, wherein a track (2) with an "I"-shaped cross-section is welded and fixed to the lower end face of the main beams (1), characterized in that: A horizontal support platform (3) is provided below the track (2). Several vertical connecting columns (4) are fixed on the lower end surface of the support platform (3). A winch unit (5) is fixed to the lower end of the connecting columns (4). Two sets of staggered support plates (6) are provided above the support platform (3). Horizontal guide rails (9) are formed on the lower end surfaces of the front and rear sides of the support plate (6). The two ends of the guide rails (9) abut against limit end blocks (7). The limit end blocks (7) are welded and fixed on the support plate (6). A slide block (10) is fixed on the support platform (3) between the limit end blocks (7). The guide rails (9) are inserted into the slide block (10). Several vertical fastening bolts (8) are inserted into the support platform (3). The upper end of the fastening bolts (8) is screwed and fixed inside the limit end block (7). Two sets of bearing plates (6) are respectively fixed with oppositely oriented walking drive motors (12). The shafts of the walking drive motors (12) pass through the side support plates (11) and are fixed with drive gears (13). Drive gears (14) mesh with drive gears (13). Drive gears (14) are connected to T-shaped drive shafts (15) by keys. Drive shafts (15) are connected to the side support plates (11) by bearings. Drive wheels (16) are connected to drive shafts (15) by keys. The end of drive shafts (15) extends outwards. The wheel (16) is screwed to a limit sleeve (17); the drive wheel (16) is distributed at one end of the side support plate (11), and the other end of the side support plate (11) is provided with a driven wheel (19). The driven wheel (19) is connected to the driven shaft (18) through a bearing. The driven shaft (18) is inserted and fixed on the side support plate (11). The side support plate (11) is fixed to the side of the two sets of bearing plates (6) near the track (2). The drive wheel (16) and the driven wheel (19) abut against the lower bottom surface of the inner side of the track (2). The two sets of bearing plates (6) are respectively formed with transverse guide grooves (61). Four vertical angle irons (20) are inserted in the guide grooves (61) and are distributed at the four corners of a rectangle. The lower end of the angle irons (20) is welded and fixed to the bearing platform (3), and the upper end extends out of the upper end of the main beam (1) and is fixed to a horizontal top plate (22). A horizontal rectangular lifting frame (21) is inserted between the two sets of main beams (1). The four corners of the lifting frame (21) abut against the inner side wall of the angle iron (20). The upper and lower end surfaces of the middle part of the lifting frame (21) are respectively fixed with longitudinal lifting plates (23). A vertical screw rod (24) is inserted and fixed in the middle of the lifting plate (23). The upper end of the screw rod (24) passes through the top plate (22) and is screwed with a handwheel (25). The handwheel (25) abuts against the upper end surface of the top plate (22). The lifting frame (21) has two sets of obliquely placed support arms (26) on the left and right sides respectively. One end of the support arm (26) is formed with a vertical stud (261). The stud (261) passes through the lifting frame (21) and is fitted with a torsion spring. One end of the torsion spring is inserted and fixed on the lifting frame (21), and the other end is inserted and fixed on the stud (261). A limit sleeve (262) is screwed and fixed on the stud (261) on the upper side of the torsion spring. The other end of the support arm (26) is formed with a vertical support shaft (263). The support shaft (263) is connected to a guide wheel (27) through a bearing. The guide wheel (27) is elastically pressed against the inner side wall of the two sets of main beams (1).

2. The double-girder crane with a convenient-to-maintain lifting trolley according to claim 1, characterized in that: The diameter of the driven wheel (19) is equal to the diameter of the driving wheel (16), and the diameter of the driven wheel (19) is less than the distance from the top plate (22) to the main beam (1).

3. A double-girder crane with a convenient-to-maintain lifting trolley according to claim 2, characterized in that: The stud (261) and the support shaft (263) are both located on the upper side of the support arm (26), and the length of the support arm (26) is greater than the horizontal distance from the lifting frame (21) to the main beam (1).

4. A double-girder crane with a convenient-to-maintain lifting trolley as described in claim 1, characterized in that: The distance from the side of the bearing plate (6) away from the track (2) to the track (2) is greater than the length of the driven wheel (19) and the driving wheel (16).

5. A double-girder crane with a convenient-to-maintain lifting trolley according to claim 4, characterized in that: The lower end face of the side support plate (11) is flush with the upper end face of the bearing plate (6). The side support plate (11) at one end of the driven wheel (19) is screwed with a vertical reinforcing bolt, which is inserted into the bearing platform (3).

6. A double-girder crane with a convenient-to-maintain lifting trolley according to claim 1, characterized in that: The main beam (1) has a rectangular cross-section, and the distance between the upper and lower bottom surfaces of the inner side of the track (2) is greater than the diameter of the driven wheel (19) and the driving wheel (16).

7. A double-girder crane with a convenient-to-maintain lifting trolley according to claim 1, characterized in that: The head of the drive shaft (15) abuts against the inner wall of the side support plate (11), and a bushing is inserted on the drive shaft (15) between the outer wall of the side support plate (11) and the driven gear (14).

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