Small anti-collapse electric gantry crane

Abstract

The present application relates to the field of prefabricated construction hoisting, and in particular to a small anti-collapse electric gantry crane, comprising a track, a gantry hanger and an anti-collapse bracket. The track is located on both sides of the inspection pit, and the gantry hanger is straddled on the track and can slide along the track. The gantry hanger includes a support frame slidably connected to the track and a crossbeam for installing a lifting component. The anti-collapse bracket is rotationally connected to the support frame in a one-to-one correspondence. Rotating the anti-collapse bracket to form an angle with the plane where the support frame is located can increase the lateral stiffness of the support frame, thereby enhancing the structural stability of the gantry hanger. A tie piece is provided between the support frame and the crossbeam, which can reduce the deformation deflection of the crossbeam and alleviate the stress concentration phenomenon by increasing the force points of the crossbeam. The present application has the effect of improving the structural stability of large-span lightweight hoisting equipment to meet the hoisting needs of the inspection pit construction in the depot.

Description

Technical Field

[0001] The present application relates to the field of prefabricated construction hoisting, and in particular to a small anti-collapse electric gantry crane. Background Art

[0002] In the construction of column-type inspection pits used for subway vehicle depot maintenance, in order to actively respond to the call of the green integrated building concept, the column-type inspection pits were transformed from the original cast-in-place structure to an assembled structure, that is, the structural components originally cast at one time were disassembled into prefabricated retaining walls and prefabricated columns, which were then transported to the construction site for assembly after mass production was completed in the factory.

[0003] However, because the column inspection pit is located inside the garage, a single-story frame structure with limited span and height, the interior space is too narrow to accommodate the large lifting equipment required. Considering the prefabricated components weigh between 200 and 350 kg, lightweight lifting equipment was sufficient.

[0004] The span of existing light gantry cranes is generally within 10 meters, which cannot meet the needs of large-span operations in tunnels. If the span of a gantry crane is too large, it is easy for the bracket to deform or even the structure to become unstable during use. Summary of the Invention

[0005] In order to improve the structural stability of large-span lightweight lifting equipment and meet the lifting needs of vehicle inspection pit construction in the depot, the present application provides a small anti-collapse electric gantry crane.

[0006] The present application provides a small anti-collapse electric gantry crane adopts the following technical solution:

[0007] A small anti-collapse electric gantry crane, comprising:

[0008] Tracks, wherein two tracks are provided, the two tracks are laid along the length direction of the inspection pit, and the inspection pit is located between the two tracks;

[0009] A door-type hanger comprises a support frame and a crossbeam, wherein two support frames are provided and correspond one to one with the track, the support frames can slide along the track, the support frames are planar frame structures, the plane formed by the support frames is a first plane, the track and the first plane are coplanar, the crossbeam is fixedly connected between the two support frames, and an anchor is connected between the support frame and the crossbeam, the anchor is used to reduce the deflection of the crossbeam;

[0010] There are two anti-overturning brackets, which are rotatably connected to the support frame in a one-to-one correspondence. The anti-overturning brackets are a planar structure, and the plane formed by the anti-overturning brackets is a second plane. When the first plane and the second plane are coplanar, the anti-overturning brackets can move with the support frame; when the first plane and the second plane are not coplanar, the anti-overturning brackets can be fixed to the ground.

[0011] By adopting the above technical solution, anti-overturning brackets rotatably connected to the support frame are provided on both sides of the portal hanger. When the first plane where the support frame is located is coplanar with the second plane where the anti-overturning bracket is located, the anti-overturning bracket is in a movable state and can slide along the track with the support frame; the anti-overturning bracket is rotated to form an angle between the first plane and the second plane. In use, the two planar structures of the anti-overturning bracket and the support frame fixed to the ground form a three-dimensional structure together, thereby improving the anti-lateral displacement stiffness of the support frame and enhancing the structural stability of the portal hanger.

[0012] Due to the large span of subway inspection pits, the portal hanger's beams are supported at both ends on support frames. Under load, the middle of the beam is prone to deflect downward. Therefore, installing anchors between the support frames and the beams can reduce beam deformation, increase the number of stress points on the beams, and alleviate stress concentration. This technical solution, by reinforcing both the support frames and the beams, enables the portal hanger to meet the construction requirements of large-span inspection pits and improves the stability of the overall structure.

[0013] Optionally, the support frame includes a top beam, a bottom beam and a column, the two ends of the top beam are each fixedly connected to the top end of the column, the two ends of the bottom beam are each fixedly connected to the bottom end of the column, the cross beam is fixedly connected to the top beam, and the length of the bottom beam is greater than the length of the top beam.

[0014] By adopting the above technical solution, the top beam and the bottom beam are horizontally tied between the two columns. Since the length of the bottom beam is greater than that of the top beam, the support frame forms a flat trapezoidal structure that is narrow at the top and wide at the bottom, which further improves the structural stability of the support frame and makes it less likely to become unstable and collapse.

[0015] Optionally, each of the two top corners of the support frame is fixedly connected to one of the anchors, and one end of the anchor away from the support frame is fixedly connected to the crossbeam.

[0016] By adopting the above technical solution, a tensioning member is set at each of the two top corners of the support frame. There are four tensioning members at both ends of the beam to pull the beam upward from different directions, which is conducive to balancing the force on the beam and enhancing the stability of the beam while reducing deflection.

[0017] Optionally, the anti-fall bracket includes a turntable and two telescopic diagonal braces, the top of the telescopic diagonal brace is fixedly connected to the turntable, the bottom of the telescopic diagonal brace is provided with a hydraulic support foot, and the turntable is rotatably connected to the support frame.

[0018] By adopting the above technical solution, the turntable is rotatably connected to the support frame, and the top of the telescopic diagonal brace is fixedly connected to the turntable. The two telescopic diagonal braces form an angle with the turntable as the corner point. The telescopic diagonal brace rotates with the turntable to change the use state of the anti-overturning bracket. The anti-overturning bracket in the non-use state is fixed to the bottom beam of the support frame through the hydraulic support foot at the bottom of the telescopic diagonal brace, so that the anti-overturning bracket can move with the support; the turntable is rotated to make the telescopic diagonal brace rotate away from the plane where the support frame is located, and the telescopic diagonal brace is extended to fix the hydraulic support foot to the ground, thereby improving the stability of the support frame.

[0019] Optionally, the small anti-collapse electric gantry crane further includes a counterweight assembly, two of which are provided and correspond one to one with the support frame, and the counterweight assembly is fixedly connected to the support frame.

[0020] By adopting the above technical solution, since the light lifting equipment itself is light in weight, a counterweight assembly corresponding to the support frame can be set to add counterweight to the portal hanger, thereby improving the anti-collapse ability of the portal hanger.

[0021] Optionally, the counterweight assembly includes a counterweight block and a connecting rod, one end of the connecting rod is fixedly connected to the counterweight block, and the other end of the connecting rod is detachably fixed to the support frame.

[0022] By adopting the above technical solution, the counterweight block can be detachably fixed to the support frame through the connecting rod, and the counterweight components of different weights can be adjusted and replaced in time according to the lifting intensity to expand the scope of use of the gantry crane.

[0023] Optionally, the crossbeam is connected to the support frame by bolts, a clearance groove is provided at the end of the crossbeam, the connecting rod is passed through the clearance groove and is bolted to the support frame, an elastic part is provided on the outer sleeve of the connecting rod, and both ends of the elastic part are respectively in contact with the counterweight block and the crossbeam.

[0024] By adopting the above technical solution, the crossbeam is the main load-bearing component during hoisting and has a large deadweight. Furthermore, the crossbeam is located at the top of the support frame, making it difficult to remove and retrieve the crossbeam after construction is complete. Therefore, an elastic member can be installed on the connecting rod of the counterweight assembly, and a clearance groove can be provided at the end of the crossbeam, so that the ends of the elastic member abut between the counterweight block and the crossbeam. After removing the bolts between the end of the crossbeam and the support frame, the crossbeam can slowly fall along the connecting rod under the action of the elastic force, making the counterweight assembly also have a buffering function, minimizing the safety hazard caused by the crossbeam falling from a high position during removal.

[0025] Optionally, the support frame is provided with a plurality of sliding components along the length direction of the bottom beam, the sliding components including rollers and a mounting plate, the mounting plate being used to connect the rollers and the support frame, and the rollers rolling along the track to drive the support frame to move on the track.

[0026] By adopting the above technical solution, arranging multiple sets of sliding components along the length direction of the bottom beam can help the support frame maintain balance during movement.

[0027] Optionally, the mounting plate is straddled on the track, both ends of the mounting plate are rotatably connected to one of the rollers, and the mounting plate is hinged to the bottom of the support frame.

[0028] By adopting the above technical solution, a roller is connected to each end of the mounting plate, and the mounting plate is placed across the track so that the rollers are located on both sides of the track. At the same time, the mounting plate is hinged to the bottom of the support frame, which can improve the flexibility of the rollers and make the movement of the support frame on the track smoother.

[0029] Optionally, the track cross-section is I-shaped, including an upper flange, a lower flange and a web, the length of the lower flange is greater than the length of the upper flange, and the two ends of the web are fixedly connected to the upper flange and the lower flange respectively, and the roller includes a vertical wheel and a horizontal wheel, the vertical wheel abuts against the lower flange, the horizontal wheel is sleeved outside the vertical wheel and abuts against the web, the rotating shaft of the vertical wheel is a first rotating shaft, the rotating shaft of the horizontal wheel is a second rotating shaft, and the first rotating shaft and the second rotating shaft are vertically fixed.

[0030] By adopting the above technical solution, a track with an I-shaped cross-section is used, and the rollers are made into a form of nested horizontal wheels and vertical wheels, so that the vertical wheels roll on the lower flange, and the horizontal wheels abut against the web, so that the rollers are tangent to the track both horizontally and vertically during movement, thereby enhancing the mutual constraint between the rollers and the track, which is conducive to preventing the rollers from derailing; the length of the lower flange is greater than the length of the upper flange, which can make room for the rollers and facilitate the installation of the rollers.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. The anti-fall brackets are rotatably connected to the support frames on both sides of the beam. By rotating the anti-fall brackets, an angle is formed between the anti-fall brackets and the support frames, which are both planar structures, thus forming a three-dimensional structure. This improves the lateral stiffness of the support frames and enhances the structural stability of the portal hanger, making it less likely to collapse.

[0033] 2. By setting up tie bars between the support frame and the beam, the stress points of the beam are increased, stress concentration is alleviated, and the deformation deflection of the long-span beam is reduced, making the light lifting equipment suitable for the construction of long-span inspection pits;

[0034] 3. By arranging an elastic part on the outer surface of the connecting rod of the counterweight assembly, the elastic part abuts between the beam and the counterweight block. When the beam is removed, the elastic force enables the beam to slowly fall along the connecting rod, so that the counterweight assembly also has a buffering function, and tries to avoid the safety hazard caused by the beam falling from a high place when taking and placing the beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of a small anti-collapse electric gantry crane according to an embodiment of the present application.

[0036] Figure 2 This is a structural diagram of a small anti-collapse electric gantry crane when the anti-collapse bracket is not in use.

[0037] Figure 3 It is a schematic diagram of the anti-fall support structure.

[0038] Figure 4 yes Figure 1 A partial enlarged view of area A in the middle.

[0039] Figure 5 yes Figure 1 A partial enlarged view of area B in the middle.

[0040] Figure 6 It is a structural diagram of the roller.

[0041] Figure 7 yes Figure 1 A partial enlarged view of part C in the middle.

[0042] Description of reference numerals:

[0043] 10. Prefabricated components; 1. Track; 11. Upper flange; 12. Lower flange; 13. Web; 2. Gantry hanger; 21. Support frame; 211. Top beam; 212. Bottom beam; 213. Column; 214. Tension beam; 215. Connecting beam; 22. Cross beam; 221. Makeway groove; 23. Anchor; 3. Anti-fall bracket; 31. Turntable; 32. Telescopic brace; 33. Hydraulic support foot; 4. Counterweight assembly; 41. Counterweight block; 42. Connecting rod; 43. Elastic member; 5. Sliding assembly; 51. Roller; 511. Vertical wheel; 512. Horizontal wheel; 513. First rotating shaft; 514. Second rotating shaft; 52. Mounting plate; 6. Lifting assembly. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-7 This application is described in further detail.

[0045] The embodiment of the present application discloses a small anti-collapse electric gantry crane.

[0046] Reference Figure 1 The small, anti-collapse electric gantry crane includes a track 1, a gantry hanger 2, and anti-collapse brackets 3. The track 1 is located on both sides of the inspection pit, and the gantry hanger 2 is straddled and slidable along the track 1. The gantry hanger 2 includes a support frame 21 that is slidably connected to the track 1 and a crossbeam 22 for mounting the lifting assembly 6. The anti-collapse brackets 3 are rotatably connected to the support frame 21 in a one-to-one correspondence. Rotating the anti-collapse brackets 3 to form an angle with the plane of the support frame 21 can increase the anti-lateral displacement rigidity of the support frame 21, thereby enhancing the structural stability of the gantry hanger 2.

[0047] Reference Figure 1 , two rails 1 are arranged relative to each other along the length direction of the inspection pit, and the support frames 21 slide above the rails 1 in a one-to-one correspondence, and the two ends of the beam 22 are respectively fixedly connected to a support frame 21. A tension member 23 is also connected between the support frame 21 and the beam 22. One end of the tension member 23 is fixed to the support frame 21, and the other end is fixed to the middle of the top surface of the beam 22. Setting tension members 23 on both sides of the beam 22 can increase the force points of the beam 22, thereby reducing the deformation deflection of the beam 22. The beam 22 is preferably an I-beam as the main load-bearing component, and an electric lifting component 6 is slidably connected to the beam 22. Considering that the weight of the prefabricated components 10 required for the construction of the inspection pit is 200~350kg, the lifting component 6 is preferably an electric hoist that is light in weight and easy to install, and the flange of the I-beam also serves as a slideway for the electric hoist.

[0048] Reference Figure 1 The support frame 21 is a planar frame structure, including a top beam 211, a bottom beam 212 and a column 213. The top beam 211 and the bottom beam 212 are parallel to the track 1. The two ends of the top beam 211 are fixedly connected to the top of a column 213, and the two ends of the bottom beam 212 are fixedly connected to the bottom of a column 213. The crossbeam 22 is fixedly connected to the center of the bottom of the top beam 211. The various parts of the portal hanger 2 are connected by steel components. The top beam 211, the bottom beam 212 and the columns 213 are welded, and the crossbeam 22 and the top beam 211 are connected by bolt welds. The length of the bottom beam 212 is greater than that of the top beam 211, which can make the support frame 21 form a planar trapezoidal structure that is narrow at the top and wide at the bottom, which is conducive to further improving the structural stability of the support frame 21 and making the support frame 21 less likely to become unstable and collapse.

[0049] Reference Figure 1, you can choose to extend the two columns 213 of the same support frame 21 upward, and then set a connecting beam 215 at the top of the two columns 213. A tension member 23 is fixedly connected to each of the two top corners of the support frame 21, and the end of the tension member 23 away from the support frame 21 is connected to 1 / 3 of the span of the beam 22. At this time, the beam 22 is divided into three equal spans, and the calculated span is shortened as much as possible. There are four tension members 23 at both ends of the beam 22 to pull the beam 22 upward from different directions, which is conducive to balancing the force on the beam 22 and enabling the beam 22 to enhance stability while reducing deflection. The tension member 23 is preferably a rigid pull rod or a flexible cable. In order to facilitate disassembly, the tension member 23 is fixed to the support frame 21 and the beam 22 with bolts. A tension beam 214 is also welded to the middle of the two columns 213. In addition to supporting the columns 213 to improve stability, the tension beam 214 is also used to connect with the anti-fall bracket 3.

[0050] Reference Figure 2 、 Figure 3 The anti-overturning bracket 3 includes a turntable 31 and two telescopic diagonal braces 32. The turntable 31 is rotatably connected to the center of the bottom surface of the tension beam 214. The top of the telescopic diagonal brace 32 is welded and fixed to the turntable 31, and a hydraulic support foot 33 is fixed to the bottom of the telescopic diagonal brace 32. The two telescopic diagonal braces 32 together form an angle with the turntable 31 as the corner point. The telescopic diagonal braces 32 rotate with the turntable 31 to change the use state of the anti-overturning bracket 3. The plane where the support frame 21 is located is the first plane, and the plane formed by the two telescopic diagonal braces 32 of the anti-overturning bracket 3 is the second plane. When the first plane and the second plane are coplanar, the anti-overturning bracket 3 is in a non-use state, and the telescopic diagonal brace 32 is fixed to the bottom beam 212 of the support frame 21 through the hydraulic support foot 33. At this time, the anti-overturning bracket 3 is stored in the plane of the support frame 21, so that it is convenient to slide along the track 1 with the support frame 21.

[0051] Reference Figure 1 、 Figure 3 When the turntable 31 rotates so that the first and second planes are not coplanar, the telescopic brace 32 is extended, securing the hydraulic support foot 33 to the ground. The anti-collapse bracket 3 is now in use. Together, the anti-collapse bracket 3 and the support frame 21 form a tower-like three-dimensional structure, thereby increasing the lateral stiffness of the support frame 21 and enhancing the structural stability of the portal hanger 2. The anti-collapse bracket 3 achieves optimal anti-collapse effectiveness when the first plane is perpendicular to the second plane.

[0052] Reference Figure 1 When the load is too heavy, counterweight assemblies 4 can be installed adjacent to the gantry hanger 2, thereby reducing the lateral displacement requirements of the gantry hanger 2 and improving its anti-collapse capability. The counterweight assemblies 4 are detachably fixed to the support frame 21, making it easy to adjust and replace counterweight assemblies 4 of different weights according to the lifting intensity, thereby expanding the use range of the gantry crane.

[0053] Reference Figure 1 、 Figure 4 The counterweight assembly 4 includes a cast iron counterweight block 41 and a connecting rod 42. The connecting rod 42 is a round rod. The bottom end of the connecting rod 42 is embedded in the counterweight block 41, and a rod is pulled between the top and the support frame 21 to fix it, so that the connecting rod 42 can remain stable. A vertical through-hole groove 221 is provided at the end of the crossbeam 22. The groove 221 is arc-shaped and fits the outer peripheral wall of the connecting rod 42. After passing through the groove 221, the connecting rod 42 is bolted to the rod used to connect the support frame 21. Since the crossbeam 22 is the main load-bearing component for lifting and has a large deadweight, when the crossbeam 22 is disassembled after construction is completed, the crossbeam 22 located at a high place is easy to fall, which is inconvenient to take and put. Therefore, an elastic member 43 can be arranged on the outer surface of the connecting rod 42 of the counterweight assembly 4. The elastic member 43 is preferably a compression coil spring so that the elastic member 43 abuts between the counterweight block 41 and the crossbeam 22. After the crossbeam 22 is released from the support frame 21, the crossbeam 22 can slowly fall along the connecting rod 42 under the action of elastic force, so that the counterweight assembly 4 also has a buffering function, and minimizes the crossbeam 22 from falling from a high place during disassembly to cause safety hazards.

[0054] Reference Figure 1 、 Figure 5 The support frame 21 is provided with two sets of sliding assemblies 5 along the length of the bottom beam 212. The number of sliding assemblies 5 can be selected according to the length of the bottom beam 212. The sliding assembly 5 includes a roller 51 and a mounting plate 52. The mounting plate 52 is used to connect the roller 51 to the support frame 21. The roller 51 rolls along the track 1 to drive the support frame 21 to move on the track 1. The mounting plate 52 is strip-shaped and is arranged across the track 1. Each end of the mounting plate 52 is rotatably connected to a roller 51. Hinging the mounting plate 52 to the bottom of the support frame 21 can improve the flexibility of the roller 51, thereby making the movement of the support frame 21 on the track 1 smoother.

[0055] Reference Figure 5-Figure 7The track 1 has an I-shaped cross-section and includes an upper flange 11, a lower flange 12, and a web 13. The length of the lower flange 12 is greater than that of the upper flange 11. The two ends of the web 13 are welded and fixed to the upper flange 11 and the lower flange 12 respectively. The roller 51 includes a vertical wheel 511 and a horizontal wheel 512. The vertical wheel 511 abuts against the lower flange 12, and the horizontal wheel 512 abuts against the side wall of the web 13. The rotating shaft of the vertical wheel 511 is the first rotating shaft 513, and the rotating shaft of the horizontal wheel 512 is the second rotating shaft 514. The second rotating shaft 514 is vertically fixed to the center of the first rotating shaft 513, and the two vertical wheels 511 are respectively sleeved on the two ends of the first rotating shaft 513. A receiving groove is provided at the bottom of the horizontal wheel 512, and the horizontal wheel 512 is sleeved on the second rotating shaft 514 so that the vertical wheel 511 is located in the receiving groove. The roller 51 is made into a form of a horizontal wheel 512 and a vertical wheel 511 nested together, so that the roller 51 is tangent to the track 1 both horizontally and vertically during movement, thereby enhancing the mutual constraint between the roller 51 and the track 1, which is beneficial to preventing the roller 51 from derailing; the length of the lower flange 12 is greater than the length of the upper flange 11, which can make room for the roller 51 and facilitate the installation of the roller 51.

[0056] The implementation principle of a small anti-collapse electric gantry crane in an embodiment of the present application is: push the gantry hanger 2 assembled and fixed with the anti-collapse bracket 3 along the track 1 to the construction site, release the hydraulic support foot 33, rotate the telescopic diagonal brace 32 so that the second plane is perpendicular to the first plane, extend the telescopic diagonal brace 32 to the ground, lock the hydraulic support foot 33, and install the lifting assembly 6 to the bottom of the beam 22. At this time, the gantry hanger 2 is in use, start the lifting assembly 6, and lift the prefabricated component 10.

[0057] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A small anti-collapse electric gantry crane, characterized in that: include: Track (1), wherein two tracks (1) are provided, the two tracks (1) are laid along the length direction of the inspection pit, and the inspection pit is located between the two tracks (1); A door-type hanger (2) comprises a support frame (21) and a crossbeam (22), wherein two support frames (21) are provided and correspond one to one with the track (1), the support frame (21) can slide along the track (1), the support frame (21) is a planar frame structure, the plane formed by the support frame (21) is a first plane, the track (1) and the first plane are coplanar, the crossbeam (22) is fixedly connected between the two support frames (21), and a tie member (23) is connected between the support frame (21) and the crossbeam (22), and the tie member (23) is used to reduce the deflection of the crossbeam (22); Two anti-fall brackets (3) are provided and are rotatably connected to the support frame (21) in a one-to-one correspondence. The anti-fall brackets (3) are planar structures. The plane formed by the anti-fall brackets (3) is a second plane. When the first plane and the second plane are coplanar, the anti-fall brackets (3) can move with the support frame (21); when the first plane and the second plane are not coplanar, the anti-fall brackets (3) can be fixed to the ground. A counterweight assembly (4), wherein two counterweight assemblies (4) are provided and correspond one to one with the support frame (21), and the counterweight assembly (4) is fixedly connected to the support frame (21); the counterweight assembly (4) includes a counterweight block (41) and a connecting rod (42), one end of the connecting rod (42) is fixedly connected to the counterweight block (41), and the other end of the connecting rod (42) is detachably fixed to the support frame (21); the crossbeam (22) and the support frame (21) are connected by bolts, and a clearance groove (221) is provided at the end of the crossbeam (22), and the connecting rod (42) is passed through the clearance groove (221) and is bolted to the support frame (21), and an elastic member (43) is provided on the outer cover of the connecting rod (42), and the two ends of the elastic member (43) are respectively in contact with the counterweight block (41) and the crossbeam (22).

2. The small anti-collapse electric gantry crane according to claim 1, characterized in that: The support frame (21) comprises a top beam (211), a bottom beam (212) and a column (213), wherein both ends of the top beam (211) are fixedly connected to the top end of one of the columns (213), and both ends of the bottom beam (212) are fixedly connected to the bottom end of one of the columns (213). The cross beam (22) is fixedly connected to the top beam (211), and the length of the bottom beam (212) is greater than that of the top beam (211).

3. The small anti-collapse electric gantry crane according to claim 2, characterized in that: The two top corners of the support frame (21) are each fixedly connected to one of the anchors (23), and one end of the anchor (23) away from the support frame (21) is fixedly connected to the crossbeam (22).

4. The small anti-collapse electric gantry crane according to claim 1 or 2, characterized in that: The anti-fall bracket (3) comprises a turntable (31) and two telescopic diagonal braces (32), the top of the telescopic diagonal brace (32) is fixedly connected to the turntable (31), the bottom of the telescopic diagonal brace (32) is provided with a hydraulic support foot (33), and the turntable (31) is rotatably connected to the support frame (21).

5. The small anti-collapse electric gantry crane according to claim 2, characterized in that: The support frame (21) is provided with a plurality of sliding components (5) along the length direction of the bottom beam (212), the sliding components (5) comprising rollers (51) and mounting plates (52), the mounting plates (52) being used to connect the rollers (51) and the support frame (21), the rollers (51) rolling along the track (1) to drive the support frame (21) to move on the track (1).

6. The small anti-collapse electric gantry crane according to claim 5, characterized in that: The mounting plate (52) is mounted across the track (1), and each end of the mounting plate (52) is rotatably connected to one of the rollers (51). The mounting plate (52) is hinged to the bottom of the support frame (21).

7. The small anti-collapse electric gantry crane according to claim 6, characterized in that: The track (1) has an I-shaped cross section and includes an upper flange (11), a lower flange (12) and a web (13). The length of the lower flange (12) is greater than that of the upper flange (11). Two ends of the web (13) are fixedly connected to the upper flange (11) and the lower flange (12), respectively. The roller (51) includes a vertical wheel (511) and a horizontal wheel (512). The vertical wheel (511) abuts against the lower flange (12). The horizontal wheel (512) is sleeved outside the vertical wheel (511) and abuts against the web (13). The rotating shaft of the vertical wheel (511) is a first rotating shaft (513), and the rotating shaft of the horizontal wheel (512) is a second rotating shaft (514). The first rotating shaft (513) and the second rotating shaft (514) are fixed vertically.

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