Crane with inclination prevention function for construction site

Abstract

The invention relates to the field of cranes, in particular to a crane with an anti-tilt function for a construction site, which comprises a crane and a lifting hook connected to the crane, a lifting ring is hung on the lifting hook, a display plate sleeve is connected to the lifting ring, and a square guide frame is slidably mounted in the display plate sleeve. The two ends of the square guide frame penetrate out of the upper end and the lower end of the display board sleeve, a display fixing piece is arranged between the display board sleeve and the square guide frame, a cross-shaped positioning frame is fixedly installed at the lower end of the square guide frame, the four ends of the cross-shaped positioning frame extend to form positioning protection plates, and the positioning protection plate located on one side is obliquely arranged. According to the trolley lifting device, the trolley can be conveniently lifted and carried, the phenomenon that the trolley inclines in the lifting and carrying process is avoided, meanwhile, the service life of the trolley is guaranteed, and it is guaranteed that when a cross-shaped positioning frame and the like are hung in the next trolley, the cross-shaped positioning frame and the like are not hindered by a lifting clamping plate.

Description

Technical Field

[0001] The present invention relates to the field of cranes, and particularly to a crane with an anti-tilting function for construction sites. Background Technique

[0002] As an indispensable heavy mechanical equipment in modern industry, cranes rely on diverse power systems such as electric motor drive and hydraulic drive, and cooperate with complex and delicate structural designs such as truss type and box type to build a three-dimensional material handling system in fields such as construction, manufacturing, and logistics. Taking port cranes as an example, through the coordinated operation of the luffing mechanism, hoisting mechanism, and slewing mechanism, they can accurately load and unload dozens of tons of containers within seconds; crawler cranes in mines rely on a powerful hydraulic system to complete the hoisting and transfer of large mining trucks on rough terrains. Among them, on construction sites, in order to meet the needs of construction, it is often necessary to use cranes to lift and transport handcarts loaded with materials such as cement.

[0003] However, during actual lifting and transportation, when it is necessary to lift a handcart full of cement and sand to the working surface of a high-rise building, there are significant drawbacks in the traditional operation process. Workers need to first bend down to wind and fix the rough lifting rope on the frame of the handcart, and then connect the lifting rope to the hook on the crane to carry out the lifting and transportation. The process is rather cumbersome, resulting in inconvenient lifting and transportation. Moreover, the handcart is prone to tilting after being lifted, and it is easy to spill the materials inside the handcart. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies in the background technique and propose a crane with an anti-tilting function for construction sites.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A crane with an anti-tilting function for construction sites, including a crane and a hook connected to the crane. A lifting ring is suspended on the hook, and a display board sleeve is connected to the lifting ring. A square guide frame is slidably installed inside the display board sleeve. Both ends of the square guide frame penetrate through the upper and lower ends of the display board sleeve. A display fastener is provided between the display board sleeve and the square guide frame. A cross positioning frame is fixedly installed at the lower end of the square guide frame. Four positioning protection plates extend from the four ends of the cross positioning frame. One of the positioning protection plates is inclined, and two hanging ears symmetrically extend from the upper end of the positioning protection plate on the other side. Pulling and hanging frames are connected to the four sides of the display board sleeve. The lower ends of the four pulling and hanging frames are all connected with hook-shaped frames. The hook-shaped frames are slidably connected to the cross positioning frame. Hook-shaped ends of the four hook-shaped frames all extend with lifting clamping plates. The four lifting clamping plates are respectively aligned with the four positioning protection plates. The lifting clamping plates are parallel to the positioning protection plates. The four positioning protection plates match the inner walls of the handcart.

[0006] Preferably, door hanging brackets are fixedly installed on the upper parts of the front and rear ends of the display board sleeve. A hanging shaft is disposed through the middle of the upper end of the door hanging bracket. The hanging shaft is in contact with the door hanging bracket, and the upper end of the hanging shaft is fixed to the lower end of a hanging ring. The door hanging bracket serves to connect the display board sleeve and the hanging ring, and the hanging shaft serves to enable the door hanging bracket to rotate.

[0007] Preferably, a lower limiting cap is coaxially embedded in the lower part of the outer surface of the hanging shaft. The lower limiting cap is in contact with the inner top surface of the door hanging bracket. An upper limiting cap is coaxially embedded in the upper part of the outer surface of the hanging shaft. The upper limiting cap is in contact with the upper end surface of the door hanging bracket. The lower limiting cap and the upper limiting cap serve to prevent the separation of the door hanging bracket and the hanging shaft.

[0008] Preferably, connecting plates are provided on the upper parts of the front and rear ends of the door hanging bracket. Threaded columns are disposed through both ends of the connecting plate. The ends of the threaded columns are fixed to the door hanging bracket. Nuts are screwed on the outer surfaces of the threaded columns. The nuts are pressed against the connecting plate. A counterweight ball is fixedly installed in the middle of the connecting plate. The connecting plate serves to carry the counterweight ball, and the threaded columns and nuts serve to fix the connecting plate to the door hanging bracket.

[0009] Preferably, a guide sleeve is slidably installed on the outer surface of the hook-shaped frame. The lower end of the guide sleeve is fixed to the cross positioning frame. An anti-detachment cap extends from the upper end of the square guide frame. Four counterweight blocks are evenly distributed near the middle of the upper end of the cross positioning frame. Hoop pieces are engaged with the upper ends and the lower ends of the counterweight blocks. Bolts are disposed through the ends of both hoop pieces. The guide sleeve serves to guide the hook-shaped frame, the anti-detachment cap serves to prevent the separation of the square guide frame and the display board sleeve, and the hoop pieces and bolts serve to fix the counterweight blocks to the cross positioning frame.

[0010] Preferably, lower connecting shafts are coaxially embedded through the opposite ends of the four hook-shaped frames. The lower end of the pulling hanging bracket is rotatably installed on the outer surface of the lower connecting shaft. An upper connecting shaft is coaxially embedded through the upper end of the pulling hanging bracket. An upper hanging claw is rotatably installed in the middle of the outer surface of the upper connecting shaft. The end of the upper hanging claw is fixed to the display board sleeve. The lower connecting shaft serves to facilitate the connection of the hook-shaped frame and the pulling hanging bracket, and the upper connecting shaft and the upper hanging claw serve to facilitate the connection of the pulling hanging bracket and the display board sleeve.

[0011] Preferably, the unfolding fastener includes two protruding shells that penetrate and are embedded in the upper parts of both sides of the display board sleeve. Fixed plate corners are slidably installed inside both of the protruding shells. The two fixed plate corners respectively abut against both sides of the square guide frame. The lower ends of the fixed plate corners are inclined near the corners of the square guide frame. A locking groove is formed in the upper part of the outer surface of the square guide frame. A release guide block is slidably installed in the lower part of the inner side of the locking groove. The protruding shells play a role in carrying the fixed plate corners, facilitating the lateral movement of the fixed plate corners to pass through the upper part of the release guide block, enabling the end of the fixed plate corner to abut against the lower inclined surface of the release guide block. When the four lifting clamping plates are unfolded, the fixed plate corners on the display board sleeve just move to the locking groove. Subsequently, the fixed plate corners extend under the push of the angle-pushing spring to be stuck at the upper edge of the locking groove, keeping the lifting clamping plates in the unfolded state. When the subsequent cross positioning frame and the like are lifted and placed into the next trolley, they will not be obstructed by the lifting clamping plates. The release guide block allows the fixed plate corners to automatically disengage from the locking groove, enabling the display board sleeve to drive the four lifting clamping plates to move towards each other and tightly hold on the outer walls around the trolley.

[0012] Preferably, a limiting post extends from the side surface of the fixed plate corner. One end of the limiting post penetrates out of the end of the protruding shell. The limiting post is slidably matched with the protruding shell. A column cap is embedded at one end of the limiting post. A push angle spring is wound around the outer side of the limiting post. One end of the push angle spring is fixed to the fixed plate corner, and the other end of the push angle spring is fixed to the inner side surface of the protruding shell. The limiting post plays a role in preventing the push angle spring from bending, and the push angle spring plays a role in pushing the fixed plate corner.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. When the crane drives the cross positioning frame to move downward, the cross positioning frame can enter the interior of the trolley. At this time, the positioning guard plate fits against the inner walls around the trolley, and at the same time, the hanging ear presses on the upper end of the trolley for positioning. Then, the crane drives the hook to move upward for lifting. At this time, the cross positioning frame remains stationary under the counterweight of the counterweight block, while the display board sleeve slides upward on the square guide frame under the lifting of the hook, thereby driving the pull suspension frame to move, so as to pull the hook-shaped frame and make the four lifting splints move towards each other to hold tightly against the outer walls around the trolley and fix it. At this time, the lifting splints are restricted by the trolley and cannot move further. Subsequently, the display board sleeve is continuously lifted, so that the display board sleeve and the square guide frame can move upward synchronously, thereby lifting the fixed trolley for lifting and handling. This process can automatically fix the trolley without manual fixing by workers, effectively facilitating the lifting and handling. At the same time, under the action of the four positioning guard plates, the lifting position can be positioned, enabling it to lift from the central part of the trolley to avoid tilting of the trolley during the lifting and handling process. Moreover, when the lifting splints hold tightly against the outer wall of the trolley, the positioning guard plate will support the lifting splints from the inner wall of the trolley, reducing the force on the trolley box hopper to avoid deformation and damage due to excessive holding force, thereby ensuring the service life of the trolley; 2. When the trolley is lifted and transported to the designated position, it can be lowered to the ground. At this time, the hook continues to move downward, and the display board sleeve slides downward on the square guide frame under the counterweight of the counterweight ball, thereby driving the pull suspension frame to move and causing the four lifting splints to unfold to release the fixation of the trolley. This process can automatically release the fixed trolley after lifting and handling, further facilitating the lifting and handling. And when the four lifting splints unfold, the fixed plate angle on the display board sleeve just moves to the locking groove. Subsequently, the fixed plate angle extends under the push of the push angle spring to be stuck at the upper edge of the locking groove, keeping the lifting splints in the unfolded state, so that when the subsequent cross positioning frame and the like are lifted and placed into the next trolley, they will not be hindered by the lifting splints. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the overall structural schematic diagram of a crane with an anti-tilting function for construction sites according to the present invention; Figure 2 is the schematic diagram of the hook part of a crane with an anti-tilting function for construction sites according to the present invention; Figure 3 is a crane with an anti-tilting function for construction sites according to the present invention Figure 2 magnified view of A in; Figure 4 is a crane with an anti-tilting function for construction sites according to the present invention Figure 2 magnified view of B in; Figure 5Schematic diagram of the counterweight ball of a crane with anti-tilting function for construction sites according to the present invention; Figure 6 Cross-sectional view of the display board sleeve of a crane with anti-tilting function for construction sites according to the present invention; Figure 7 Schematic diagram of the square guide frame of a crane with anti-tilting function for construction sites according to the present invention; Figure 8 Usage view of a crane with anti-tilting function for construction sites according to the present invention; Figure 9 Schematic diagram of the trolley of a crane with anti-tilting function for construction sites according to the present invention.

[0015] In the drawings, the list of components represented by each reference numeral is as follows: 1. Crane; 2. Hook; 3. Sling ring; 4. Counterweight ball; 5. Door hanger; 6. Square guide frame; 7. Cross positioning frame; 8. Pull hanger; 9. Guide sleeve; 10. Positioning guard plate; 11. Lifting splint; 12. Hook-shaped frame; 13. Anti-detachment cap; 14. Extension shell; 15. Display board sleeve; 16. Upper shelf claw; 17. Limiting column; 18. Fixed plate corner; 19. Push angle spring; 20. Lock groove; 21. Release guide block; 22. Hanging ear; 23. Counterweight block; 24. Bolt; 25. Hoop piece; 26. Lower connecting shaft; 27. Connecting plate; 28. Threaded column; 29. Nut; 30. Lower limiting cap; 31. Hanging shaft; 32. Upper limiting cap; 33. Upper connecting shaft; 34. Column cap; 35. Trolley. Detailed implementation manners

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] The present invention provides a technical solution: As Figures 1-9A crane with an anti-tilting function for construction sites, as shown, includes a crane 1 and a hook 2 connected to the crane 1. A sling ring 3 is suspended on the hook 2, and a display board sleeve 15 is connected to the sling ring 3. A square guide frame 6 is slidably installed inside the display board sleeve 15. The display board sleeve 15 plays a role in driving the movement of the pulling and hanging frame 8. The two ends of the square guide frame 6 penetrate through the upper and lower ends of the display board sleeve 15. A display fastener is provided between the display board sleeve 15 and the square guide frame 6. The square guide frame 6 plays a role in enabling the display board sleeve 15 to move vertically. A cross positioning frame 7 is fixedly installed at the lower end of the square guide frame 6. Four positioning guard plates 10 extend from the four ends of the cross positioning frame 7. The cross positioning frame 7 plays a role in bearing the positioning guard plates 10. The positioning guard plate 10 on one side is inclined, which can adapt to the inner wall slope of the trolley 35. At the upper end of the positioning guard plate 10 on the other side, two hanging ears 22 symmetrically extend. The hanging ears 22 can press on the upper end of the trolley 35 to prevent the cross positioning frame 7 from falling. Pulling and hanging frames 8 are connected to the four sides of the display board sleeve 15. The lower ends of the four pulling and hanging frames 8 are all connected with hook-shaped frames 12. The pulling and hanging frames 8 play a role in driving the movement of the hook-shaped frames 12. The hook-shaped frames 12 are slidably connected to the cross positioning frame 7. The hook-shaped ends of the four hook-shaped frames 12 all extend with lifting clamping plates 11. The four lifting clamping plates 11 are respectively aligned with the four positioning guard plates 10. The lifting clamping plates 11 and the positioning guard plates 10 are arranged in parallel. When the lifting clamping plates 11 are tightened on the outer wall of the trolley 35, the positioning guard plates 10 will support the lifting clamping plates 11 from the inner wall of the trolley 35, reducing the force on the hopper of the trolley 35 to avoid deformation and damage due to excessive tightening force. The four positioning guard plates 10 match the inner wall of the trolley 35, ensuring that the four positioning guard plates 10 fit on the inner wall of the trolley 35 for positioning, thereby positioning the lifting position so that it can be lifted from the central part of the trolley 35 to avoid tilting of the trolley 35 during the lifting and handling process.

[0018] On the upper parts of the front and rear ends of the display board sleeve 15, a door hanging frame 5 is fixedly installed. In the middle of the upper end of the door hanging frame 5, a hanging shaft 31 is penetrated. The door hanging frame 5 plays a role in connecting the display board sleeve 15 and the sling ring 3. The hanging shaft 31 fits with the door hanging frame 5. The upper end of the hanging shaft 31 is fixed to the lower end of the sling ring 3. The hanging shaft 31 plays a role in enabling the door hanging frame 5 to rotate.

[0019] A lower limit cap 30 is coaxially inlaid on the lower part of the outer surface of the hanging shaft 31. The lower limit cap 30 fits on the inner top surface of the door hanging frame 5. An upper limit cap 32 is coaxially inlaid on the upper part of the outer surface of the hanging shaft 31. The upper limit cap 32 fits on the upper end surface of the door hanging frame 5. The lower limit cap 30 and the upper limit cap 32 play a role in preventing the separation of the door hanging frame 5 and the hanging shaft 31.

[0020] At the upper parts of the front and rear ends of the door hanger 5, connecting plates 27 are provided. Threaded columns 28 penetrate through both ends of the connecting plate 27. The connecting plate 27 serves to carry the counterweight ball 4. The ends of the threaded columns 28 are fixed to the door hanger 5. Nuts 29 are screwed onto the outer surfaces of the threaded columns 28. The threaded columns 28 and the nuts 29 serve to fix the connecting plate 27 to the door hanger 5. The nuts 29 are pressed against the connecting plate 27. A counterweight ball 4 is fixedly installed in the middle of the connecting plate 27.

[0021] A guide sleeve 9 is slidably installed on the outer surface of the hook-shaped frame 12. The lower end of the guide sleeve 9 is fixed to the cross positioning frame 7. The guide sleeve 9 serves to guide the hook-shaped frame 12. An anti-disengagement cap 13 extends from the upper end of the square guide frame 6. The anti-disengagement cap 13 serves to prevent the separation of the square guide frame 6 and the display board sleeve 15. Four counterweight blocks 23 are evenly distributed near the middle of the upper end of the cross positioning frame 7. Hoop pieces 25 are engaged with the upper ends and the lower ends of the counterweight blocks 23. Bolts 24 penetrate through the ends of the two hoop pieces 25. The hoop pieces 25 and the bolts 24 serve to fix the counterweight blocks 23 to the cross positioning frame 7.

[0022] Lower connecting shafts 26 are inserted through and inlaid in the opposite ends of the four hook-shaped frames 12. The lower end of the pulling hanger 8 is rotatably installed on the outer surface of the lower connecting shaft 26. The lower connecting shaft 26 serves to facilitate the connection between the hook-shaped frame 12 and the pulling hanger 8. An upper connecting shaft 33 is inserted through and inlaid in the upper end of the pulling hanger 8. The middle of the outer surface of the upper connecting shaft 33 is rotatably installed with an upper mounting claw 16. The upper connecting shaft 33 and the upper mounting claw 16 serve to facilitate the connection between the pulling hanger 8 and the display board sleeve 15. The end of the upper mounting claw 16 is fixed to the display board sleeve 15.

[0023] The unfolding fixture includes two protruding shells 14 embedded through the upper parts on both sides of the display board sleeve 15. Fixed plate corners 18 are slidably installed inside both of the two protruding shells 14. The protruding shells 14 serve to carry the fixed plate corners 18. The two fixed plate corners 18 respectively abut against both sides of the square guide frame 6. The lower ends of the fixed plate corners 18 are inclined near the corners of the square guide frame 6, which can facilitate the lateral movement of the fixed plate corners 18 to pass through the upper part of the release guide block 21, so that the ends of the fixed plate corners 18 can abut against the lower inclined surfaces of the release guide block 21. A lock groove 20 is formed in the upper part of the outer surface of the square guide frame 6. When the four lifting clamping plates 11 are unfolded, the fixed plate corners 18 on the display board sleeve 15 just move to the lock groove 20. Subsequently, the fixed plate corners 18 extend out under the push of the push angle spring 19 to be stuck at the upper edge of the lock groove 20, keeping the lifting clamping plates 11 in the unfolded state. When the subsequent cross positioning frame 7 and the like are lifted and placed into the next trolley 35, they will not be obstructed by the lifting clamping plates 11. A release guide block 21 is slidably installed at the lower part inside the lock groove 20. The release guide block 21 can enable the fixed plate corners 18 to automatically disengage from the lock groove 20, allowing the display board sleeve 15 to drive the four lifting clamping plates 11 to move towards each other and tightly hold the outer walls around the trolley 35.

[0024] A limiting column 17 extends from the side surface of the fixed plate corner 18. One end of the limiting column 17 penetrates out from the end of the protruding shell 14. The limiting column 17 serves to prevent the push angle spring 19 from bending. The limiting column 17 is in sliding fit with the protruding shell 14. A column cap 34 is embedded at one end of the limiting column 17. A push angle spring 19 is wound around the outer side of the limiting column 17. One end of the push angle spring 19 is fixed to the fixed plate corner 18, and the push angle spring 19 serves to push the fixed plate corner 18. The other end of the push angle spring 19 is fixed to the inner side surface of the protruding shell 14.

[0025] When the trolley 35 is lifted and transported to the designated position, it can be lowered to the ground. At this time, the hook 2 continues to move downward, and the display board sleeve 15 slides downward on the square guide frame 6 under the counterweight of the counterweight ball 4, thereby driving the pulling and hanging frame 8 to move, causing the four lifting clamping plates 11 to expand, so as to loosen the fixation on the trolley 35. When the four lifting clamping plates 11 expand, the fixed plate angle 18 on the display board sleeve 15 just moves to the locking groove 20. Subsequently, the fixed plate angle 18 extends under the push of the push angle spring 19 and is stuck at the upper edge of the locking groove 20, keeping the lifting clamping plates 11 in the expanded state. When the subsequent cross positioning frame 7 and the like are lifted and placed into the next trolley 35, they will not be obstructed by the lifting clamping plates 11. Then, the cross positioning frame 7 and the like can be lifted and placed above the next trolley 35. Subsequently, the crane 1 drives the cross positioning frame 7 to move downward, enabling the cross positioning frame 7 to enter the interior of the trolley 35. At this time, the positioning guard plate 10 fits against the inner walls around the trolley 35, and at the same time, the hanging ear 22 presses on the upper end of the trolley 35 for positioning. Subsequently, continue to lower. At this time, the display board sleeve 15 continues to slide downward on the square guide frame 6, and the fixed plate angle 18 moves to the release guide block 21 and is laterally displaced under the drive of the inclined surface of the fixed plate angle 18 to pass through the upper part of the release guide block 21, so that the end of the fixed plate angle 18 can abut against the lower inclined surface of the release guide block 21. Then, the crane 1 drives the hook 2 to lift. At this time, the cross positioning frame 7 remains stationary under the counterweight of the counterweight block 23, while the display board sleeve 15 slides upward on the square guide frame 6 under the lifting of the hook 2, thereby driving the pulling and hanging frame 8 to move to pull the hook-shaped frame 12, causing the four lifting clamping plates 11 to move towards each other. The fixed plate angle 18 will move upward synchronously with the display board sleeve 15 and lift the release guide block 21. When the release guide block 21 moves upward and abuts against the upper edge of the locking groove 20, it will remain stationary. Subsequently, the display board sleeve 15 continues to slide upward on the square guide frame 6, and at the same time, the fixed plate angle 18 slides on the inclined surface of the release guide block 21, causing the fixed plate angle 18 to disengage from the locking groove 20 and abut against the surface of the square guide frame 6 to ensure that the display board sleeve 15 can continue to slide upward on the square guide frame 6, thereby driving the four lifting clamping plates 11 to continue to move towards each other, enabling the lifting clamping plates 11 to tightly hold on the outer walls around the trolley 35 and fix it. At this time, the lifting clamping plates 11 are restricted by the trolley 35 and cannot move further. Subsequently, continue to lift the display board sleeve 15, enabling the display board sleeve 15 and the square guide frame 6 to move upward synchronously, thereby lifting the fixed trolley 35 for lifting and transportation. This cycle continues. At the same time, under the action of the four positioning guard plates 10, the lifting position can be positioned so that it can be lifted from the central part of the trolley 35 to avoid the trolley 35 tilting during the lifting and transportation process. And when the lifting clamping plates 11 tightly hold on the outer wall of the trolley 35, the positioning guard plates 10 will support the lifting clamping plates 11 from the inner wall of the trolley 35, reducing the force on the box of the trolley 35 to avoid deformation and damage due to excessive clamping force, thereby ensuring the service life of the trolley 35.

[0026] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A crane with an anti-tilting function for construction sites, comprising a crane and a hook connected to the crane, characterized in that: A lifting ring is suspended on the hook, a display board sleeve is connected to the lifting ring, a square guide frame is slidably installed inside the display board sleeve, both ends of the square guide frame penetrate through the upper and lower ends of the display board sleeve, a display fastener is arranged between the display board sleeve and the square guide frame, a cross positioning frame is fixedly installed at the lower end of the square guide frame, positioning guard plates extend from the four ends of the cross positioning frame, the positioning guard plate on one side is inclined, and two hanging ears symmetrically extend from the upper end of the positioning guard plate on the other side. Pulling and hanging frames are connected to the four sides of the display board sleeve, hook-shaped frames are connected to the lower ends of the four pulling and hanging frames, the hook-shaped frames are slidably connected to the cross positioning frame, lifting clamping plates extend from the hook-shaped ends of the four hook-shaped frames, the four lifting clamping plates are respectively aligned with the four positioning guard plates, the lifting clamping plates and the positioning guard plates are arranged in parallel, and the four positioning guard plates match the inner wall of the trolley.

2. A crane with an anti-tilting function for construction sites according to claim 1, characterized in that: Door hanging frames are fixedly installed at the upper parts of the front and rear ends of the display board sleeve, a hanging shaft penetrates through the middle of the upper end of the door hanging frame, the hanging shaft is in contact with the door hanging frame, and the upper end of the hanging shaft is fixed to the lower end of the lifting ring.

3. A crane with an anti-tilting function for construction sites according to claim 2, characterized in that: A lower limiting cap is coaxially inlaid on the lower part of the outer surface of the hanging shaft, the lower limiting cap is in contact with the inner top surface of the door hanging frame, an upper limiting cap is coaxially inlaid on the upper part of the outer surface of the hanging shaft, and the upper limiting cap is in contact with the upper end surface of the door hanging frame.

4. A crane with an anti-tilting function for construction sites according to claim 2, characterized in that: Connection plates are arranged at the upper parts of the front and rear ends of the door hanging frame, threaded columns penetrate through both ends of the connection plates, the ends of the threaded columns are fixed to the door hanging frame, nuts are screwed on the outer surfaces of the threaded columns, the nuts are pressed on the connection plates, and a counterweight ball is fixedly installed in the middle of the connection plates.

5. A crane with an anti-tilting function for construction sites according to claim 1, characterized in that: A guide sleeve is slidably installed on the outer surface of the hook-shaped frame, the lower end of the guide sleeve is fixed to the cross positioning frame, an anti-detachment cap extends from the upper end of the square guide frame, four counterweight blocks are evenly distributed near the middle of the upper end of the cross positioning frame, and hoop pieces are clamped between the upper ends and the lower ends of the counterweight blocks, and bolts penetrate through the ends of the two hoop pieces.

6. A crane with an anti-tilting function for construction sites according to claim 1, characterized in that: Lower connecting shafts are penetrated and inlaid at the opposite ends of the four hook-shaped frames, the lower ends of the pulling and hanging frames are rotatably installed on the outer surfaces of the lower connecting shafts, upper connecting shafts are penetrated and inlaid at the upper ends of the pulling and hanging frames, and upper rack claws are rotatably installed in the middle of the outer surfaces of the upper connecting shafts, and the ends of the upper rack claws are fixed to the display board sleeve.

7. A crane with an anti-tilting function for construction sites according to claim 1, characterized in that: The display fastener includes two protruding shells penetrating and inlaid on the upper parts of both sides of the display board sleeve, fixed plate corners are slidably installed inside the two protruding shells, the two fixed plate corners respectively press against both sides of the square guide frame, the lower ends of the fixed plate corners are inclined near the corners of the square guide frame, a locking groove is opened on the upper part of the outer surface of the square guide frame, and a release guide block is slidably installed on the lower inner side of the locking groove.

8. A crane with an anti-tilting function for construction sites according to claim 7, characterized in that: A limiting column extends from the side surface of the fixed plate corner, one end of the limiting column penetrates through the end of the protruding shell, the limiting column is slidably matched with the protruding shell, a column cap is inlaid at one end of the limiting column, a push-angle spring is wound around the outer side of the limiting column, one end of the push-angle spring is fixed to the fixed plate corner, and the other end of the push-angle spring is fixed to the inner side surface of the protruding shell.

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