A single main beam gantry crane

Abstract

This utility model relates to a single-girder gantry crane, including a gantry crane body with a main girder, a support frame slidably connected to the main girder, a horizontally arranged I-beam traveling beam installed below the support frame, the I-beam traveling beam being rotatably connected to the support frame, a rack installed on the bottom surface of the I-beam traveling beam, and a lifting trolley also installed on the I-beam traveling beam. The lifting trolley includes a U-shaped wheel frame with its U-shaped opening facing upwards, traveling wheels rotatably connected to the top two sides of the U-shaped wheel frame located outside the I-beam traveling beam, a drum device with a hook installed at the bottom of the U-shaped wheel frame, and a rotating shaft located below the rack installed inside the U-shaped wheel frame. The two ends of the rotating shaft are rotatably connected to the U-shaped wheel frame, and a traveling motor is driven to one end of the rotating shaft. A first gear meshing with the rack is also coaxially mounted on the rotating shaft. In use, this utility model can improve the positioning accuracy when the lifting trolley moves to its position within a small range in the front-rear direction.

Description

Technical Field

[0001] This utility model belongs to the field of lifting equipment technology, and in particular relates to a single main beam gantry crane. Background Technology

[0002] Currently, existing single-girder gantry cranes typically include a horizontally arranged main girder, with outrigger structures installed at both ends of the main girder. Each set of outrigger structures has a ground beam installed at its bottom, on which a trolley traveling mechanism is installed. In addition, lifting components such as electric hoists that can move along the main girder are slidably connected to the main girder.

[0003] In use, if we assume the length of the main beam is the left-right direction, the electric hoist can move left and right when it moves along the main beam; then, when the gantry crane moves along the preset track via the trolley traveling mechanism, the electric hoist can move back and forth. However, this method of moving the electric hoist back and forth by moving the entire gantry crane is not convenient for accurate positioning after the electric hoist has reached its destination when it needs to move the electric hoist within a small range in the back-and-forth direction due to factors such as inertia. Therefore, there are still shortcomings and deficiencies in the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a single-girder gantry crane to solve the problems mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve the above problems is as follows: A single-girder gantry crane includes a gantry crane body with a single main girder. The main girder is horizontally arranged, and a support frame that can move along the main girder is slidably connected to the main girder. A horizontally arranged I-beam traveling beam is installed below the support frame. The top surface of the I-beam traveling beam is rotatably connected to the support frame. A rack parallel to the length direction of the I-beam traveling beam is installed on the bottom surface of the I-beam traveling beam, and a lifting trolley that can move along the I-beam traveling beam is installed on the I-beam traveling beam. The lifting trolley includes a U-shaped wheel frame with the U-shaped opening facing upwards. The top two sides of the U-shaped wheel frame are located outside the I-shaped traveling beam and are rotatably connected to traveling wheels that can travel on the I-shaped traveling beam. The bottom of the U-shaped wheel frame is located below the I-shaped traveling beam and is equipped with a drum device with a hook. A rotating shaft located below the rack is installed inside the U-shaped wheel frame. The axial line of the rotating shaft is parallel to the axial line of the traveling wheels. Both ends of the rotating shaft are rotatably connected to the U-shaped wheel frame. One end of the rotating shaft is driven to a traveling motor installed on the U-shaped wheel frame. A first gear that can mesh with the rack is also coaxially mounted on the rotating shaft.

[0006] Furthermore, vertically distributed connecting shafts are fixedly mounted on the top surface of the I-shaped traveling beam. The top end of the connecting shaft is rotatably connected to the bearing frame through an external toothed slewing bearing. The external toothed slewing bearing is connected to a drive device mounted on the bearing frame.

[0007] Furthermore, a fall-prevention ring coaxial with the connecting shaft is fixedly mounted on the support frame. The outer ring of the fall-prevention ring is located outside the support frame. Vertical rods located outside the fall-prevention ring are installed on the top surfaces of both ends of the I-shaped traveling beam. A horizontal rod located above the fall-prevention ring is fixedly mounted on the inner side of the top of each vertical rod to form an inverted L-shaped fall-prevention rod.

[0008] Furthermore, the gantry crane body also includes two horizontally opposite and spaced ground beams. The ground beams are perpendicular to the main beam in the horizontal direction, and a trolley traveling mechanism is installed on the ground beams. Vertically opposite support leg structures are also installed between the two ends of each ground beam and the end of the main beam.

[0009] Furthermore, the top of the support frame is slidably connected to the main beam via a movable trolley that can move along the main beam.

[0010] Furthermore, limit blocks are installed at both ends of the I-shaped traveling beam.

[0011] The beneficial effects of this utility model by adopting the above technical solution are as follows: This utility model sets the lifting component as a lifting trolley, and assumes that the length direction of the main beam is the left and right direction when the lifting trolley moves, and the direction when the gantry crane moves along the preset track is the front and back direction when the lifting trolley moves. In use, when the support frame moves along the main beam, it can indirectly drive the lifting trolley to move left and right; and when the gantry crane moves along the preset track, it can drive the lifting trolley to move back and forth.

[0012] Based on this, by installing a rotatable I-beam traveling beam on the support frame, when the traveling motor is started, it drives the first gear to rotate. The first gear, in conjunction with the rack, causes the traveling wheels to move simultaneously along the I-beam traveling beam, allowing the crane trolley to move along it. Thus, when a small lateral movement of the crane trolley is required, rotating the I-beam traveling beam aligns it with the main beam, allowing the crane trolley to move along it. Because the gear and rack transmission provides precise positioning, the first gear... The gear and rack work together to ensure accurate positioning of the crane trolley when it moves slightly to its position in the left-right direction. When it needs to move slightly in the front-back direction, the I-beam traveling beam is rotated to make it perpendicular to the main beam in the horizontal direction, allowing the crane trolley to move along the I-beam traveling beam. Again, due to the precise positioning provided by the gear and rack transmission, the first gear and rack work together to improve the positioning accuracy of the crane trolley when it moves slightly to its position in the front-back direction compared to existing technologies. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 A schematic diagram of the structure of the middle part of the device; Figure 3 for Figure 2 Side view of the middle part of the device; Figure 4 This is a three-dimensional structural diagram of some of the devices of this utility model; Figure 5 for Figure 1 Side view of the middle part of the device.

[0014] Reference numerals: 1. Rack; 2. Lifting trolley; 21. U-shaped wheel frame; 22. Traveling wheel; 23. Hook; 24. Drum assembly; 25. Shaft; 26. Traveling motor; 27. First gear; 3. I-beam traveling beam; 4. Gantry crane body; 41. Main beam; 42. Ground beam; 43. Trolley traveling mechanism; 44. Outrigger structure; 5. Bearing frame; 6. Connecting shaft; 7. External gear slewing bearing; 8. Drive unit; 81. Drive motor; 82. Second gear; 9. Anti-fall ring; 10. Anti-fall bar; 11. Movable trolley; 12. Limit block; 13. Cover plate; 14. Protective cover; 15. Rail. Detailed Implementation

[0015] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0016] like Figures 1 to 5 As shown, this utility model provides a single main beam gantry crane, including a gantry crane body 4 with a main beam 41, and an electrical control system installed on the gantry crane body 4; the main beam 41 is horizontally arranged; a support frame 5 that can move along the main beam 41 is slidably connected to the main beam 41, and a horizontally arranged I-beam traveling beam 3 is installed below the support frame 5. The top surface of the I-beam traveling beam 3 is rotatably connected to the support frame 5, that is, the I-beam traveling beam 3 can rotate in the horizontal direction; a rack 1 parallel to the length direction of the I-beam traveling beam 3 is installed on the bottom surface of the I-beam traveling beam 3, and the rack 1 can be set to be the same length as the I-beam traveling beam 3; Furthermore, a lifting trolley 2 capable of moving along the I-beam traveling beam 3 is installed on the I-beam traveling beam 3. The lifting trolley 2 is electrically connected to the electrical control system of the gantry crane body 4. Specifically, in this utility model, the lifting component is set as the lifting trolley 2, and it is assumed that the length direction of the main beam 41 is the left-right direction when the lifting trolley 2 moves, and the direction when the gantry crane as a whole moves along the preset track 15 is the front-back direction when the lifting trolley 2 moves. In use, when the support frame 5 moves along the main beam 41, it can indirectly drive the lifting trolley 2 to move left and right; and when the gantry crane as a whole moves along the preset track 15, it can drive the lifting trolley 2 to move back and forth.

[0017] The lifting trolley 2 includes a U-shaped wheel frame 21 with the U-shaped opening facing upwards. The top two sides of the U-shaped wheel frame 21 are located outside the I-shaped traveling beam 3 and are rotatably connected to traveling wheels 22 that can travel on the I-shaped traveling beam 3. The bottom of the U-shaped wheel frame 21 is located below the I-shaped traveling beam 3 and is equipped with a drum device 24 with a hook 23. The drum device 24 is existing technology, that is, the drum device 24 includes a housing, a drum, a drum motor, a reducer, and a steel wire rope wound on the drum, etc. The hook 23 is connected to the steel wire rope through a movable pulley block. In use, the drum device 24 can drive the hook 23 to rise and fall by winding and unwinding the steel wire rope.

[0018] Furthermore, a rotating shaft 25 located below the rack 1 is installed inside the U-shaped wheel frame 21. The axial line of the rotating shaft 25 is parallel to the axial line of the traveling wheel 22. Both ends of the rotating shaft 25 are rotatably connected to the U-shaped wheel frame 21, and one end of the rotating shaft 25 is drivenly connected to a traveling motor 26 mounted on the U-shaped wheel frame 21. A first gear 27 that can mesh with the rack 1 is also coaxially mounted on the rotating shaft 25. Specifically, when the traveling motor 26 is started, it can drive the first gear 27 to rotate. The first gear 27 and the rack 1 cooperate to make the traveling wheel 22 move along the I-shaped traveling beam 3 at the same time, so that the crane trolley 2 can move along the I-shaped traveling beam 3. At the same time, it can ensure the stability of the crane trolley 2 when moving along the I-shaped traveling beam 3.

[0019] Based on this, since the I-beam traveling beam 3 and the support frame 5 are rotatably connected, when the trolley 2 needs to be moved slightly in the left-right direction, rotating the I-beam traveling beam 3 will make it parallel to the main beam 41, allowing the trolley 2 to move along the I-beam traveling beam 3. Because the gear and rack transmission can provide precise positioning, the first gear 27, in conjunction with the rack 1, ensures accurate positioning of the trolley 2 when it moves slightly in the left-right direction. Similarly, when the trolley 2 needs to be moved slightly in the front-back direction, rotating the I-beam traveling beam 3 will make it perpendicular to the main beam 41 in the horizontal direction, allowing the trolley 2 to move along the I-beam traveling beam 3. Again, because the gear and rack transmission can provide precise positioning, the first gear 27, in conjunction with the rack 1, improves the positioning accuracy of the trolley 2 when it moves slightly in the front-back direction compared to existing technologies.

[0020] The specific arrangement of the top surface of the I-beam traveling beam 3 and the bearing frame 5 for rotatable connection is as follows: Figure 1 and Figure 2 As shown, vertically distributed connecting shafts 6 are fixedly mounted on the top surface of the I-shaped traveling beam 3. The top end of the connecting shaft 6 is rotatably connected to the bearing frame 5 through an external toothed slewing bearing 7. Specifically, the inner ring of the external toothed slewing bearing 7 is connected to the bearing frame 5, and a cover plate 13 is coaxially fixed to the top end of the connecting shaft 6 and connected to the outer ring of the external toothed slewing bearing 7 through the cover plate 13. In addition, the external toothed slewing bearing 7 is driven by a drive device 8 mounted on the bearing frame 5, and the drive device 8 is electrically connected to the electrical control system of the gantry crane body 4. Specifically, the drive device 8 includes components vertically mounted inside the bearing frame 5. The drive motor 81 has an output shaft that passes through the support frame 5 and is fitted with a second gear 82 that meshes with the external teeth of the external gear slewing bearing 7. In use, when the drive motor 81 is started, the second gear 82 and the external gear slewing bearing 7 can drive the I-beam traveling beam 3 to rotate through the connecting shaft 6. After the I-beam traveling beam 3 has rotated to its position, the braking function of the drive motor 81 can prevent the I-beam traveling beam 3 from continuing to rotate. In addition, a protective cover 14 installed on the support frame 5 is provided on both the external gear slewing bearing 7 and the second gear 82.

[0021] Furthermore, such as Figure 1 and Figure 2As shown, a fall arresting ring 9 is fixedly mounted on the support frame 5, which is coaxial with the connecting shaft 6. The outer ring of the fall arresting ring 9 is located outside the support frame 5. Vertical bars located outside the fall arresting ring 9 are installed on the top surfaces of both ends of the I-beam traveling beam 3. A horizontal bar located above the fall arresting ring 9 is fixedly mounted on the inner side of the top of the vertical bar to form an inverted L-shaped fall arresting bar 10. Specifically, during use, if the rotating connection between the I-beam traveling beam 3 and the support frame 5 breaks accidentally, causing the I-beam traveling beam 3 to fall, the horizontal bar of the fall arresting bar 10 can hook the fall arresting ring 9, thereby reducing the safety hazard of the I-beam traveling beam 3 falling from a height.

[0022] The specific configuration of the gantry crane body 4 is as follows: Figure 1 and Figure 5 As shown, the gantry crane body 4 also includes two horizontally opposite and spaced-apart ground beams 42. The ground beams 42 are perpendicular to the main beam 41 in the horizontal direction, and a trolley traveling mechanism 43 is installed on the ground beams 42. The trolley traveling mechanism 43 is electrically connected to the electrical control system of the gantry crane body 4. Specifically, the trolley traveling mechanism 43 is existing technology, that is, the trolley traveling mechanism 43 includes axles, trolley traveling wheels, and trolley traveling motors, etc. In use, as with existing technology, the entire gantry crane can move along a preset track 15 via the trolley traveling mechanism 43. In addition, vertically opposite support leg structures 44 are installed between the two ends of each ground beam 42 and the end of the main beam 41. Specifically, the specific arrangement of the support leg structures 44 is as follows: Figure 5 As shown, there is a certain space between the tops of the two sets of leg structures 44 at each end of the main beam 41. When the I-beam traveling beam 3 is parallel to the main beam 41, one end of the I-beam traveling beam 3 can be moved to the outside of the main beam 41, which makes it easier to use the crane trolley 2 to lift heavy objects located outside the track 15.

[0023] The specific arrangement of the support frame 5, which can move along the main beam 41, is as follows: Figure 1 As shown, the top of the support frame 5 is slidably connected to the main beam 41 via a movable trolley 11 that can move along the main beam 41. Specifically, the structure of the movable trolley 11 can refer to the setting method of the crane trolley 2 moving along the I-shaped traveling beam 3, that is, the movable trolley 11 includes a wheel frame, wheels, trolley traveling motor, etc.; and the movable trolley 11 is electrically connected to the electrical control system of the gantry crane body 4; when in use, after the movable trolley 11 is started, the support frame 5 can be moved along the main beam 41 by the movable trolley 11, thereby indirectly driving the crane trolley 2 to move along the main beam 41.

[0024] Furthermore, such as Figure 1 and Figure 2As shown, limit blocks 12 are installed at both ends of the I-beam traveling beam 3. The limit blocks 12 are mechanical limiters to prevent the crane trolley 2 from running over the limit, so as to avoid the crane trolley 2 from slipping off the I-beam traveling beam 3.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A single-girder gantry crane, comprising a gantry crane body with a single main girder, wherein the main girder is horizontally arranged, characterized in that: A support frame that can move along the main beam is slidably connected to the main beam. A horizontally arranged I-beam traveling beam is installed below the support frame. The top surface of the I-beam traveling beam is rotatably connected to the support frame. A rack parallel to the length direction of the I-beam traveling beam is installed on the bottom surface of the I-beam traveling beam. A lifting trolley that can move along the I-beam traveling beam is also installed on the I-beam traveling beam. The lifting trolley includes a U-shaped wheel frame with the U-shaped opening facing upward. The top two sides of the U-shaped wheel frame are located outside the I-beam traveling beam and are rotatably connected to traveling wheels that can travel on the I-beam traveling beam. The bottom of the U-shaped wheel frame is located below the I-beam traveling beam and is equipped with a drum device with a hook. A rotating shaft located below the rack is installed inside the U-shaped wheel frame. The axial line of the rotating shaft is parallel to the axial line of the traveling wheels. Both ends of the rotating shaft are rotatably connected to the U-shaped wheel frame. One end of the rotating shaft is driven by a traveling motor installed on the U-shaped wheel frame. A first gear that can mesh with the rack is also coaxially mounted on the rotating shaft.

2. A single-girder gantry crane according to claim 1, characterized in that: The top surface of the I-shaped traveling beam is fixed with vertically distributed connecting shafts. The top end of the connecting shaft is rotatably connected to the bearing frame through an external toothed slewing bearing. The external toothed slewing bearing is connected to a drive device mounted on the bearing frame.

3. A single-girder gantry crane according to claim 2, characterized in that: A fall-prevention ring is fixedly mounted on the support frame and is arranged coaxially with the connecting shaft. The outer ring of the fall-prevention ring is located outside the support frame. Vertical rods located outside the fall-prevention ring are installed on the top surfaces of both ends of the I-shaped traveling beam. A horizontal rod located above the fall-prevention ring is fixedly mounted on the inner side of the top of each vertical rod to form an inverted L-shaped fall-prevention rod.

4. A single-girder gantry crane according to claim 1 or 2, characterized in that: The gantry crane body also includes two horizontally opposite and spaced-apart ground beams. The ground beams are perpendicular to the main beam in the horizontal direction, and a trolley traveling mechanism is installed on the ground beams. Vertically opposite support leg structures are also installed between the two ends of each ground beam and the end of the main beam.

5. A single-girder gantry crane according to claim 1, characterized in that: The top of the support frame is slidably connected to the main beam via a movable trolley that can move along the main beam.

6. A single-girder gantry crane according to claim 1, characterized in that: Limit blocks are installed at both ends of the I-shaped traveling beam.

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