A crane arm anti-rollover mechanism and use method

Abstract

The present invention relates to the technical field of anti-rollover of crane boom, and discloses an anti-rollover mechanism of crane boom and a using method, wherein the top sliding assembly of the turntable is provided with two groups of fixed seats, and the two groups of fixed seats have built-in locking components, the top of the turntable and corresponding positions of the two ends of the sliding stroke of the fixed seats are provided with locking holes, the locking components and the locking holes match, the top of the turntable is provided with a slideway corresponding to the fixed seat, the slideway is slidingly provided with a driving plate, and the driving plate is slidingly assembled at the bottom of the fixed seat, and the output end of the hydraulic telescopic cylinder is fixedly connected to the right end of the driving plate, when the hydraulic telescopic cylinder is actuated, it can drive the driving plate to move, so that the driving plate can be correspondingly connected to the auxiliary counterweight block, the fixed seat and the outrigger under different counterweight requirements, so as to achieve different counterweight operations under different lifting operations, thereby improving the safety of the crane during lifting work.

Description

Technical Field

[0001] The present invention relates to the technical field of crane boom anti-rollover, and in particular to a crane boom anti-rollover mechanism and a use method thereof. Background Art

[0002] A crane is a machine that lifts or moves heavy objects through a lifting hook or other lifting devices. As the position of the heavy object changes, the center of gravity of the crane is constantly shifting. When its center of gravity moves to a more offset position, there may be a risk of rollover, causing a major accident. The usual way to prevent rollover is to install side-lifting legs during the boom raising process to improve the stability and anti-rollover ability of the entire machine. However, in a narrow space construction environment such as mountain wind power, due to space limitations, the lateral boom requires multiple adjustments of the main machine, which seriously affects the efficiency of equipment disassembly and assembly, and even makes it impossible to raise the long arm sideways. Therefore, other methods are needed to improve the ability to raise the main arm and the ability to resist forward rollover.

[0003] A crane and a boom raising method thereof with application number CN202210082376.6, wherein the leg interface is adapted to be detachably connected to the disassembly leg and the positive raising leg, the positive raising leg is used for the positive raising of the crane, and when the crane is raising the arm forward, the positive raising leg is connected to the leg interface along the traveling direction of the crane and is located on the boom raising side of the crane, which can improve the boom raising stability and anti-rollover ability of the crane and realize the positive raising work, and can complete the positive raising of the arm under space constraints and long boom conditions.

[0004] In actual use, it is necessary to carry the legs and the upright legs at all times to facilitate the disassembly and assembly of the legs and the upright legs through the leg interfaces, which undoubtedly increases the workload of the staff. In addition, the upright legs are long, so there is also the defect of being inconvenient to carry. They are heavy and require the cooperation of multiple staff to complete the disassembly and assembly, which is time-consuming and labor-intensive. There are safety hazards during disassembly and assembly, and the length cannot be adjusted after installation, resulting in inability to achieve effective support in some narrow spaces.

[0005] Therefore, the present invention solves the above-mentioned problem through a crane boom anti-rollover mechanism and a use method. Summary of the invention

[0006] The object of the present invention is to provide a crane boom anti-rollover mechanism and a use method thereof to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a crane boom anti-rollover mechanism, comprising an anti-rollover protection assembly mounted on a crane body, the crane body comprising a base, a transmission crawler is mounted on the front and rear sides of the base, a turntable is mounted on the top of the base, two sets of main counterweights are fixedly mounted on the top of the turntable, and a boom is hingedly mounted between the two sets of main counterweights, a hydraulic support is hingedly mounted on the boom, two sets of fixed seats are slidably mounted on the top of the turntable, and locking assemblies are built into the two sets of fixed seats, locking holes are provided at the top of the turntable and at the corresponding positions at both ends of the sliding stroke of the fixed seats, the locking assemblies match the locking holes, and the two sets of fixed seats are hingedly assembled through a rotating shaft and the bottom end of the hydraulic support;

[0008] A slideway corresponding to the fixed seat is provided on the top of the turntable, a driving plate is slidably mounted in the slideway, and the driving plate is slidably mounted on the bottom of the fixed seat, and a hydraulic telescopic cylinder is fixedly mounted inside the turntable, and the output end of the hydraulic telescopic cylinder is fixedly connected to the right end of the driving plate;

[0009] A secondary counterweight block is slidably mounted on the top right end of the turntable, a first electromagnet is embedded in the right end of the drive plate, a magnetic block matching the first electromagnet is embedded in the left wall of the secondary counterweight block, a second electromagnet is embedded in the left end of each group of drive plates, and a magnetic plate matching the second electromagnet is embedded in the bottom of the two groups of fixed seats.

[0010] Preferably, there are two groups of slides, and each group of slides is opened along the length direction of the turntable. The bottom of each group of drive plates is integrally formed with an inverted T-shaped slide seat slidably assembled inside the slide, and the output end of the hydraulic telescopic cylinder is fixed on the inverted T-shaped slide seat.

[0011] Preferably, a transverse channel is provided at the bottom of each group of the fixed seats, and the drive plates are slidably received in the transverse channel, and each group of drive plates is slidably assembled on the top of the turntable, and a slide groove corresponding to the transverse channel is provided at the bottom of the main counterweight.

[0012] Preferably, the locking holes are symmetrically arranged at the front and rear sides of the slideway, and the bottom of the fixing seat is provided with an extended groove corresponding to the locking hole, and the locking assembly is fixedly installed in the extended groove.

[0013] Preferably, two groups of arms are slidably assembled inside the base, and each group of arms and the driving plate are correspondingly arranged on a vertical plane, the end of each group of arms extends out of the left side wall of the base, and a third electromagnet is embedded in the end of each group of arms, and the left end of each group of arms is adsorbed and assembled with a longitudinally arranged leg.

[0014] Preferably, a magnetic sheet matching the third electromagnet is embedded on the side wall of each group of the legs, the top of the legs is flush with the top of the turntable, and a magnetic ring matching the second electromagnet is embedded on the top of the legs.

[0015] Preferably, the length of the two groups of support arms is greater than the distance from the left side of the base to the left end of the conveyor track, and the two groups of support arms are both rectangular plates, and each group of support arms is horizontally arranged.

[0016] Preferably, a driving configuration device is fixed on the top of the turntable, a winch is fixedly mounted on the main counterweight, a steel wire rope is wound around the winch, and a hook is fixedly mounted on the end of the steel wire rope.

[0017] The present invention provides a method for using a crane boom anti-rollover mechanism, and the steps of the method for using the method are as follows:

[0018] S1: During the hoisting operation, the drive configuration device drives the conveyor crawler to move to the preset position, and then the winch works to drive the hook on the wire rope to achieve hoisting, and the hydraulic support moves to adjust the boom angle. During the hoisting process, the main counterweight and the auxiliary counterweight block work together to complete the hoisting counterweight work;

[0019] S2: When performing heavy-weight lifting work, the hydraulic telescopic cylinder moves the driving plate to the right. When the driving plate moves to the right and contacts the auxiliary counterweight block, the first electromagnet is energized to generate magnetic attraction to the magnetic block. Then the driving plate drives the auxiliary counterweight block to move to the right on the turntable, thereby increasing the counterweight arm length of the auxiliary counterweight block and improving the counterweight safety.

[0020] S3: When performing long-distance lifting, the boom length is extended, resulting in an increase in the length of the load arm and an increased possibility of the crane tipping over. At this time, the hydraulic telescopic cylinder drives the drive plate to move left, the first electromagnet loses power and the second electromagnet is energized, driving the fixed seat to move left on the slewing table through the drive plate, thereby changing the supporting position of the fixed seat on the slewing table, and when the locking assembly is actuated, it is locked in the locking hole to complete the limit fixation of the fixed seat, and the safety of the outward lifting of the boom is enhanced by changing the fulcrum position of the hydraulic support;

[0021] S4: When the fixing seat is locked, the second electromagnet loses power, and the hydraulic telescopic cylinder continues to drive the drive plate to move left. When the drive plate contacts the outrigger, the second electromagnet is energized again, generating a magnetic attraction to the magnetic ring on the top of the outrigger, and then driving the outrigger and the arm to move left, thereby increasing the distance between the outrigger and the crane, thereby extending the tipping line of the crane and achieving the purpose of supporting and preventing rollover.

[0022] S5: When the crane is performing sideways lifting, at this time, after the drive plate and the outrigger are in contact, the second electromagnet is energized and the third electromagnet is de-energized, at this time the arm and the outrigger are separated, and the drive plate drives the outrigger to move to the farthest position, and then the turntable rotates relative to the base. When the boom is performing lifting work, the auxiliary counterweight block performs counterweight anti-tipping, and the outrigger performs support anti-tipping, thereby enhancing the support and anti-tipping safety of the crane during sideways lifting.

[0023] Technical effects and advantages of the present invention:

[0024] 1. The hydraulic telescopic cylinder in the present invention drives the driving plate to move right. When the driving plate moves right and contacts the auxiliary counterweight block, the first electromagnet is energized to generate magnetic attraction on the magnetic block. Then the driving plate drives the auxiliary counterweight block to move right on the turntable, thereby increasing the length of the counterweight arm of the auxiliary counterweight block, improving the safety of the counterweight, and completing the initial and basic counterweight operation.

[0025] 2. The hydraulic telescopic cylinder in the present invention is actuated to drive the drive plate to move left, the first electromagnet loses power and the second electromagnet gains power, and the drive plate drives the fixed seat to move left on the slewing table, thereby changing the supporting position of the fixed seat on the slewing table, enhancing the counterweight strength of the crane, and completing the counterweight strengthening operation. When the locking assembly is actuated, it is locked in the locking hole to complete the limited fixation of the fixed seat, and the safety of the outward lifting of the boom is enhanced by changing the fulcrum position of the hydraulic support.

[0026] 3. The hydraulic telescopic cylinder in the present invention continues to drive the drive plate to move left. When the drive plate contacts the outrigger, the second electromagnet is energized again, generating a magnetic attraction to the magnetic ring on the top of the outrigger, thereby driving the outrigger and the arm to move left, thereby increasing the distance between the outrigger and the crane, thereby extending the tipping line of the crane, achieving the purpose of supporting and preventing rollover, and being able to complete the support of the crane on the basis of the counterweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall existing technical structure of a crawler crane;

[0028] Figure 2 It is a schematic diagram of the overall structure of the present invention and crawler crane assembly from a first perspective;

[0029] Figure 3 It is a schematic diagram of the overall structure of the present invention and crawler crane assembly from a second perspective;

[0030] Figure 4 This is a schematic diagram of the structure of the upright lifting device in the first use state of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the upright lifting device in the second use state of the present invention;

[0032] Figure 6This is a schematic diagram of the structure of the upright lifting device in the third use state of the present invention;

[0033] Figure 7 It is a schematic diagram of the structure of the side hanging in use state of the present invention.

[0034] In the figure: 1. base; 2. conveyor track; 3. turntable; 4. drive configuration device; 5. main counterweight; 6. boom; 7. winch; 8. wire rope; 9. hook; 10. hydraulic support; 11. auxiliary counterweight; 12. fixed seat; 13. rotating shaft; 14. drive plate; 15. slideway; 16. locking hole; 17. support arm; 18. support leg. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Embodiment 1

[0036] like Figures 1 to 7 As shown, the present embodiment discloses a crane boom anti-rollover mechanism, comprising an anti-rollover protection component assembled on a crane body, the crane body comprising a base 1, a conveying crawler 2 being assembled on the front and rear sides of the base 1, a turntable 3 being assembled on the top of the base 1, two sets of main counterweights 5 being fixedly mounted on the top of the turntable 3, and a boom 6 being hingedly assembled between the two sets of main counterweights 5, a driving configuration device 4 being fixedly mounted on the top of the turntable 3, a winch 7 being fixedly mounted on the main counterweight 5, a steel wire rope 8 being wound around the winch 7, a hook 9 being fixedly assembled on the end of the steel wire rope 8, a hydraulic support 10 being hingedly assembled on the boom 6, two sets of fixed seats 12 being slidably assembled on the top of the turntable 3, and the two sets of fixed seats 12 having built-in locking components, locking holes 16 being opened on the top of the turntable 3 and at corresponding positions at both ends of the sliding stroke of the fixed seats 12, the locking components matching the locking holes 16, and the two sets of fixed seats 12 being hingedly assembled through a rotating shaft 13 and the bottom end of the hydraulic support 10.

[0037] When performing lifting operations, please refer to Figure 1 The driving configuration device 4 drives the conveyor track 2 to move to the preset position, and then the winch 7 works to drive the hook 9 on the wire rope 8 to realize lifting, and the hydraulic support 10 is activated to adjust the angle of the boom 6. During the lifting process, the main counterweight 5 and the auxiliary counterweight block 11 work together to complete the lifting counterweight work. When the locking assembly is activated, it is embedded in the locking hole 16 to fix the fixed seat 12, thereby enhancing the stability of the fixed seat 12 to the hydraulic support 10.

[0038] See also Figure 2-Figure 7 A slideway 15 corresponding to the fixed seat 12 is provided on the top of the turntable 3, a driving plate 14 is slidably mounted in the slideway 15, and the driving plate 14 is slidably mounted at the bottom of the fixed seat 12, and a hydraulic telescopic cylinder is fixedly mounted inside the turntable 3, and the output end of the hydraulic telescopic cylinder is fixedly connected to the right end of the driving plate 14, and an auxiliary counterweight block 11 is slidably mounted on the right end of the top of the turntable 3, a first electromagnet is embedded in the right end of the driving plate 14, and a magnetic block matching the first electromagnet is embedded in the left wall of the auxiliary counterweight block 11, and a second electromagnet is embedded in the left end of each group of driving plates 14, The bottom of the two sets of fixed seats 12 are embedded with a magnetic plate that matches the second electromagnet. When the first electromagnet is energized, it can generate a magnetic attraction force on the magnetic block, which facilitates the driving plate 14 to drive the auxiliary counterweight block 11 to move on the turntable 3, thereby increasing the length of the counterweight arm and completing the counterweight work of the hoisted load. When the second electromagnet is energized, it can generate a magnetic attraction force on the magnetic plate, so that the fixed seat 12 is fixed on the driving plate 14, so that when the driving plate 14 moves, it can drive the fixed seat 12 to move synchronously, which is convenient for changing the support position of the fixed seat 12 on the turntable 3.

[0039] See also Figure 3 The locking holes 16 are symmetrically arranged on the front and rear sides of the slide 15, and the bottom of the fixed seat 12 is provided with an extended groove corresponding to the locking hole 16, and the locking component is fixedly installed in the extended groove, and when the locking component is actuated, it is locked in the locking hole 16 to complete the limited fixation of the fixed seat 12, and the safety of the extended hoisting of the boom 6 is enhanced by changing the fulcrum position of the hydraulic support 10, to avoid the increase of the overturning moment caused by the excessive extended length of the boom 6, and to complete the anti-rollover operation.

[0040] Please note that Figure 3 There are two groups of slides 15, and each group of slides 15 is opened along the length direction of the turntable 3. The bottom of each group of driving plates 14 is integrally formed with an inverted T-shaped slide seat slidably assembled inside the slide 15. The output end of the hydraulic telescopic cylinder is fixed on the inverted T-shaped slide seat. A transverse channel is opened at the bottom of each group of fixed seats 12, and the driving plate 14 is slidably accommodated in the transverse channel, and each group of driving plates 14 is fitted and slidably assembled on the top of the turntable 3, and a slide groove corresponding to the transverse channel is opened at the bottom of the main counterweight 5.

[0041] When the hydraulic telescopic cylinder drives the driving plate 14 to move in the slideway 15, the driving plate 14 can slide well in the transverse channel and the slide groove, which can ensure that the driving plate 14 will not interfere with the fixed seat 12 and the main counterweight 5 when moving.

[0042] See also Figure 2 and Figure 3Two groups of arms 17 are slidably mounted inside the base 1, and each group of arms 17 and the driving plate 14 are correspondingly arranged on a vertical plane, the end of each group of arms 17 extends out of the left side wall of the base 1, and the end of each group of arms 17 is embedded with a third electromagnet, and the left end of each group of arms 17 is adsorbed and assembled with a longitudinally arranged leg 18, and a magnetic sheet matching the third electromagnet is embedded on the side wall of each group of legs 18, the top of the leg 18 is flush with the top of the turntable 3, and a magnetic ring matching the second electromagnet is embedded in the top of the leg 18.

[0043] When the hydraulic telescopic cylinder is in motion, it can drive the driving plate 14 to move, so that the driving plate 14 can be connected to the auxiliary counterweight block 11, the fixing seat 12 and the legs 18 accordingly under different counterweight requirements, so as to achieve different counterweight operations under different lifting operations, thereby improving the safety of the crane during lifting work, specifically:

[0044] During the hoisting operation, when the outward extension length of the boom 6 remains unchanged and the load increases, the hydraulic telescopic cylinder drives the driving plate 14 to move rightward. When the driving plate 14 moves rightward and contacts the auxiliary counterweight block 11, the first electromagnet is energized to generate magnetic attraction to the magnetic block, and then the driving plate 14 drives the auxiliary counterweight block 11 to move rightward on the turntable 3, thereby increasing the counterweight arm length of the auxiliary counterweight block 11. For details, please refer to Figure 4 In this way, when the load increases while the lifting length and the lifting angle remain unchanged, the lifting counterweight when the load changes can be completed by simply changing the position of the auxiliary counterweight block 11, thereby improving the safety of the counterweight;

[0045] During hoisting, when the length of the boom 6 is extended, the load arm length of the boom 6 increases, and the possibility of the crane tipping over increases. At this time, the driving plate 14 drives the auxiliary counterweight block 11 to move rightward to the farthest end to achieve maximum counterweighting. Then the hydraulic telescopic cylinder drives the driving plate 14 to move leftward. The first electromagnet loses power while the second electromagnet is energized. The driving plate 14 drives the fixed seat 12 to move leftward on the turntable 3, thereby changing the supporting position of the fixed seat 12 on the turntable 3. For details, please refer to Figure 5 and Figure 6 This can effectively reduce the load arm length of the boom 6 and increase the counterweight arm length of the auxiliary counterweight block 11. In this way, when the length of the boom 6 increases, the safety of the outward lifting of the boom 6 can be enhanced by changing the fulcrum position of the hydraulic support 10. When the locking assembly is actuated, it is locked in the locking hole 16 to complete the limited fixation of the fixing seat 12 and improve the supporting stability of the hydraulic support 10.

[0046] It should be noted that when the support length of the hydraulic support 10 increases, the inclination angle of the boom 6 increases, while the effective arm length of the load decreases, so it is sufficient to maintain normal counterweight operation. When the support length of the hydraulic support 10 decreases, the inclination angle of the boom 6 decreases, while the effective arm length of the load increases, and the overturning moment of the crane increases. Therefore, after the fixing seat 12 is locked, the second electromagnet loses power, and the hydraulic telescopic cylinder continues to drive the drive plate 14 to move left. When the drive plate 14 contacts the support leg 18, the second electromagnet is energized again to generate a magnetic attraction to the magnetic ring at the top of the support leg 18, and the third electromagnet is energized. At this time, the support leg 18 and the support arm 17 are fixedly connected, so that the drive plate 14 can drive the support leg 18 and the support arm 17 to move left. For details, please refer to Figure 6 and Figure 7 , so as to increase the distance between the outrigger 18 and the crane, thereby extending the tipping line of the crane and achieving the purpose of supporting and preventing rollover.

[0047] It is particularly noted that when the crane is performing sideways lifting, the tipping line of the crane moves inward. At this time, the crane is more likely to tip over. Therefore, when the crane is performing sideways lifting, the hydraulic telescopic cylinder drives the drive plate 14 to move left. When the drive plate 14 and the support leg 18 are in contact, the second electromagnet is energized and the third electromagnet is de-energized. At this time, the support arm 17 and the support leg 18 are separated, and the drive plate 14 drives the support leg 18 to move to the farthest position. Then the turntable 3 rotates relative to the base 1. When the boom 6 is performing lifting work, the auxiliary counterweight block 11 performs counterweight anti-tipping, and the support leg 18 performs support anti-tipping, thereby enhancing the support anti-tipping safety of the crane during sideways lifting. Therefore, when the drive plate 14 moves, the drive plate 14 can complete different counterweight anti-tipping operations at different positions.

[0048] See also Figure 7 The length of the two groups of arms 17 is greater than the distance from the left side of the base 1 to the left end of the conveyor crawler 2, and the two groups of arms 17 are both rectangular plates, and each group of arms 17 is horizontally arranged. When the legs 18 and arms 17 are not arranged on the crane, the tipping line of the crane is the first supporting wheel position of the conveyor crawler 2, and by arranging the outwardly extending arms 17 and legs 18, the tipping line of the crane can be moved outward, thereby increasing the support of the crane during lifting. Embodiment 2

[0049] This embodiment discloses a method for using a crane boom anti-rollover mechanism, and the steps of the method are as follows:

[0050] S1: During the hoisting operation, the driving configuration device 4 drives the conveyor crawler 2 to move to the preset position, and then the winch 7 works to drive the hook 9 on the wire rope 8 to achieve hoisting, and the hydraulic support 10 works to adjust the angle of the boom 6. During the hoisting process, the main counterweight 5 and the auxiliary counterweight block 11 work together to complete the hoisting counterweight work;

[0051] S2: When performing heavy-weight lifting work, the hydraulic telescopic cylinder drives the driving plate 14 to move rightward. When the driving plate 14 moves rightward and contacts the auxiliary counterweight block 11, the first electromagnet is energized to generate magnetic attraction to the magnetic block, and then the driving plate 14 drives the auxiliary counterweight block 11 to move rightward on the turntable 3, thereby increasing the counterweight arm length of the auxiliary counterweight block 11 and improving the counterweight safety;

[0052] S3: When performing long-distance lifting, the length of the boom 6 is extended, resulting in an increase in the length of the load arm and an increased possibility of the crane tipping over. At this time, the hydraulic telescopic cylinder is actuated to drive the drive plate 14 to move leftward, the first electromagnet is de-energized and the second electromagnet is energized, and the drive plate 14 drives the fixed seat 12 to move leftward on the turntable 3, thereby changing the supporting position of the fixed seat 12 on the turntable 3, and when the locking assembly is actuated, it is locked in the locking hole 16, completing the limit fixation of the fixed seat 12, and enhancing the safety of the outward lifting of the boom 6 by changing the fulcrum position of the hydraulic support 10;

[0053] S4: When the fixing seat 12 is locked, the second electromagnet loses power, and the hydraulic telescopic cylinder continues to drive the driving plate 14 to move left. When the driving plate 14 contacts the outrigger 18, the second electromagnet is energized again, generating a magnetic attraction force on the magnetic ring on the top of the outrigger 18, and then drives the outrigger 18 and the arm 17 to move left, thereby increasing the distance between the outrigger 18 and the crane, thereby extending the tipping line of the crane, and achieving the purpose of supporting and preventing rollover;

[0054] S5: When the crane is performing lateral lifting, at this time, after the drive plate 14 and the support leg 18 are in contact, the second electromagnet is energized and the third electromagnet is de-energized, and the support arm 17 and the support leg 18 are separated, and the drive plate 14 drives the support leg 18 to move to the farthest position, and then the turntable 3 rotates relative to the base 1. When the boom 6 is performing lifting work, the auxiliary counterweight block 11 performs counterweight anti-tipping, and the support leg 18 performs support anti-tipping, thereby enhancing the support and anti-tipping safety of the crane during lateral lifting.

[0055] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A crane boom anti-rollover mechanism, comprising an anti-rollover protection assembly mounted on a crane body, the crane body comprising a base (1), the front and rear sides of the base (1) being equipped with conveyor crawlers (2), the top of the base (1) being equipped with a turntable (3), the top of the turntable (3) being fixedly mounted with two sets of main counterweights (5), and a boom (6) being hingedly mounted between the two sets of main counterweights (5), and a hydraulic support (10) being hingedly mounted on the boom (6), characterized in that: The top of the turntable (3) is slidably equipped with two groups of fixed seats (12), and the two groups of fixed seats (12) have built-in locking components. Locking holes (16) are provided at the top of the turntable (3) and at the corresponding positions at both ends of the sliding stroke of the fixed seats (12). The locking components match the locking holes (16). The two groups of fixed seats (12) are hingedly assembled through the rotating shaft (13) and the bottom end of the hydraulic support (10); The top of the turntable (3) is provided with a slideway (15) corresponding to the fixed seat (12), a drive plate (14) is slidably mounted in the slideway (15), and the drive plate (14) is slidably mounted on the bottom of the fixed seat (12), and a hydraulic telescopic cylinder is fixedly mounted inside the turntable (3), and the output end of the hydraulic telescopic cylinder is fixedly connected to the right end of the drive plate (14); The top right end of the turntable (3) is slidably equipped with an auxiliary counterweight (11), the right end of the driving plate (14) is embedded with a first electromagnet, the left side wall of the auxiliary counterweight (11) is embedded with a magnetic block matching the first electromagnet, the left end of each group of driving plates (14) is embedded with a second electromagnet, and the bottoms of the two groups of fixed seats (12) are both embedded with a magnetic plate matching the second electromagnet.

2. The crane boom anti-rollover mechanism according to claim 1, characterized in that: The slideways (15) are provided in two groups, and each group of slideways (15) is opened along the length direction of the turntable (3). The bottom of each group of drive plates (14) is integrally formed with an inverted T-shaped slide seat slidably assembled inside the slideway (15), and the output end of the hydraulic telescopic cylinder is fixed on the inverted T-shaped slide seat.

3. The crane boom anti-rollover mechanism according to claim 2, characterized in that: A transverse channel is provided at the bottom of each set of the fixing seats (12), and the driving plates (14) are slidably received in the transverse channel. Each set of driving plates (14) is slidably assembled on the top of the turntable (3), and a sliding groove corresponding to the transverse channel is provided at the bottom of the main counterweight (5).

4. The crane boom anti-rollover mechanism according to claim 1, characterized in that: The locking holes (16) are symmetrically arranged at the front and rear sides of the slideway (15), and the bottom of the fixing seat (12) is provided with an extended groove corresponding to the locking hole (16), and the locking assembly is fixedly installed in the extended groove.

5. The crane boom anti-rollover mechanism according to claim 3, characterized in that: Two groups of supporting arms (17) are slidably mounted inside the base (1), and each group of supporting arms (17) and the driving plate (14) are arranged on a vertical plane correspondingly, the end of each group of supporting arms (17) extends outward from the left side wall of the base (1), and a third electromagnet is embedded in the end of each group of supporting arms (17), and the left end of each group of supporting arms (17) is adsorbed and mounted with a longitudinally arranged supporting leg (18).

6. The crane boom anti-rollover mechanism according to claim 5, characterized in that: A magnetic sheet matching the third electromagnet is embedded in the side wall of each group of the legs (18), the top of the legs (18) is flush with the top of the turntable (3), and a magnetic ring matching the second electromagnet is embedded in the top of the legs (18).

7. The crane boom anti-rollover mechanism according to claim 6, characterized in that: The length of the two groups of support arms (17) is greater than the distance from the left side of the base (1) to the left end of the conveyor track (2), and the two groups of support arms (17) are both rectangular plates, and each group of support arms (17) is arranged horizontally.

8. The crane boom anti-rollover mechanism according to claim 7, characterized in that: A driving device (4) is fixed on the top of the turntable (3), a winch (7) is fixedly mounted on the main counterweight (5), a steel wire rope (8) is wound around the winch (7), and a hook (9) is fixedly mounted on the end of the steel wire rope (8).

9. A method for using the crane boom anti-rollover mechanism according to claim 8, characterized in that: The steps for using it are: S1: When performing a lifting operation, the driving configuration device (4) drives the conveyor crawler (2) to move to a preset position, and then the winch (7) works to drive the hook (9) on the wire rope (8) to achieve lifting, and the hydraulic support (10) works to adjust the angle of the boom (6). During the lifting process, the main counterweight (5) and the auxiliary counterweight block (11) work together to complete the lifting counterweight work; S2: When performing heavy-weight lifting work, the hydraulic telescopic cylinder is actuated to drive the driving plate (14) to move rightward. When the driving plate (14) moves rightward and contacts the auxiliary counterweight block (11), the first electromagnet is energized to generate a magnetic attraction force on the magnetic block, and then the driving plate (14) drives the auxiliary counterweight block (11) to move rightward on the turntable (3), thereby increasing the counterweight arm length of the auxiliary counterweight block (11) and improving the counterweight safety. S3: When performing long-distance lifting, the length of the boom (6) is extended, resulting in an increase in the length of the load arm and an increased possibility of the crane tipping over. At this time, the hydraulic telescopic cylinder is actuated to drive the drive plate (14) to move leftward, the first electromagnet is de-energized and the second electromagnet is energized, and the drive plate (14) is used to drive the fixed seat (12) to move leftward on the turntable (3), thereby changing the supporting position of the fixed seat (12) on the turntable (3), and when the locking assembly is actuated, it is locked in the locking hole (16), completing the limit fixation of the fixed seat (12), and enhancing the safety of the outward lifting of the boom (6) by changing the fulcrum position of the hydraulic support (10); S4: When the fixing seat (12) is locked, the second electromagnet loses power, and the hydraulic telescopic cylinder continues to drive the driving plate (14) to move leftward. When the driving plate (14) and the supporting leg (18) are in contact, the second electromagnet is energized again, generating a magnetic attraction force on the magnetic ring at the top of the supporting leg (18), thereby driving the supporting leg (18) and the supporting arm (17) to move leftward, thereby increasing the distance between the supporting leg (18) and the crane, thereby extending the tipping line of the crane, and achieving the purpose of supporting and preventing rollover; S5: When the crane is performing lateral lifting, at this time, after the drive plate (14) and the support leg (18) are in contact, the second electromagnet is energized and the third electromagnet is de-energized, and at this time the support arm (17) and the support leg (18) are separated, and the drive plate (14) drives the support leg (18) to move to the farthest position, and then the turntable (3) rotates relative to the base (1). When the boom (6) is performing lifting work, the auxiliary counterweight block (11) performs counterweight anti-tipping, and the support leg (18) performs support anti-tipping, thereby enhancing the support anti-tipping safety of the crane when performing lateral lifting.

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