Cantilever crane anti-tilting device and crane thereof

Abstract

The utility model discloses a cantilever crane anti-roll device and crane, cantilever crane anti-roll device includes main telescopic pole, vice telescopic pole, locating plate and drive mechanism, main telescopic pole and vice telescopic pole one end are both rotatingly connected with stay pole, vice telescopic pole is arranged relative to main telescopic pole close to stay pole and cantilever crane connecting end, vice telescopic pole is equipped with the locating plate, vice telescopic pole is equipped with the drive mechanism. The other end of the auxiliary telescopic rod is matched with the main telescopic rod and used for controlling the rotating angle between the main telescopic rod and the supporting rod, the driving mechanism is used for driving the main telescopic rod and the auxiliary telescopic rod to stretch out and draw back, the positioning plate is installed on the arm frame, and a positioning groove is formed in the positioning plate. The driving mechanism drives the main telescopic rod and the auxiliary telescopic rod to stretch out and draw back, the auxiliary telescopic rod is matched with the main telescopic rod and used for controlling the rotating angle between the main telescopic rod and the supporting rod, and then the end, away from the supporting rod, of the main telescopic rod is arranged to be the free end and matched with a positioning groove in the positioning plate. Therefore, the crane does not need working personnel to work aloft, and the safety, the working efficiency and the accuracy are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to an anti-tipping device for a boom and a crane thereof. Background Technique

[0002] During the operation of a crane, if the goods fall off or the hoisting rope breaks, since the luffing system of the crane can only bear tension, the hoisting rope, the pulling plate and the luffing rope will become slack, and the boom will rotate towards the counterweight direction, and the boom will tip backward, which may lead to the danger of vehicle destruction and human casualties. Therefore, when designing the crawler crane as a whole, an anti-tipping device should be set for the whole machine, so as to prevent the boom from tipping and reduce the vibration of the boom under special working conditions such as sudden unloading, and improve the system stability.

[0003] Figure 1 It is a schematic structural diagram of a crane after the boom is raised in the prior art. Figure 2 It is a schematic structural diagram of an anti-tipping rod in the prior art. As Figure 1 and Figure 2 shown, the anti-tipping rods of cranes are mostly spring-type telescopic anti-tipping rods or pin-type anti-tipping rods. During the assembly process, the rear anti-tipping rod 7 needs to be assembled first, and then the main boom 5 is lifted first to make the front pulling plate 2 straighten. The staff needs to climb to a high altitude to install the positioning pin 8 of the front anti-tipping rod 6 to the predetermined position, and the disassembly process is the opposite. When installing the front anti-tipping rod 6, the staff needs to drag the front anti-tipping rod 6 and drag one end of the front anti-tipping rod 6 to the installation hole of the main boom 5, and then insert the positioning pin 8 into the positioning pin hole 9 of the front anti-tipping rod 6 to fix the length of the front anti-tipping rod 6.

[0004] The boom raising process of the existing crane includes: connecting the auxiliary boom 1, the front pulling plate 2, the strut 3, the rear pulling plate 4 and the main boom 5 respectively with the help of an auxiliary crane, pulling the strut 3 forward with the auxiliary crane until the rear pulling plate 4 is straightened, connecting the rear anti-tipping rod 7, and inserting the positioning pin 8 of the rear anti-tipping rod 7 into the positioning pin hole 9 for positioning; then raising the boom and lifting the main boom 5 to make the front pulling plate 2 straighten. The staff climbs onto the boom from the pulley end of the auxiliary boom 1, installs the front anti-tipping rod 6, inserts the positioning pin 8 of the rear anti-tipping rod 6 into the positioning pin hole 9 for positioning, releases the auxiliary crane, and the boom raising is completed.

[0005] The boom lowering process of the existing crane includes: the main boom 5 first lies forward at a certain angle. Before the auxiliary boom 1 lands, use the auxiliary crane to lift the strut 3. The staff climbs onto the boom from the pulley end of the auxiliary boom 1, removes the pin connecting the front anti-tipping rod 6 to the auxiliary boom 1 end, and removes the positioning pin 8 on the front anti-tipping rod 6, and tie the front anti-tipping rod 6 to the strut 3; the main boom 5 continues to lie down, and after the main boom 5 lands, remove the pin connecting the rear anti-tipping rod 7 to the main boom 5 end, and remove the positioning pin 8 on the rear anti-tipping rod 7, tie the rear anti-tipping rod 7 to the strut 3, the staff evacuates, and the strut 3 is laid forward, and the boom lowering is completed.

[0006] Therefore, the existing cranes adopt spring - type telescopic anti - tipping rods or pin - type anti - tipping rods. During the assembly and disassembly processes, workers need to climb onto the boom for high - altitude operations. The height of the boom can reach more than ten meters. High - altitude operations pose safety hazards, are difficult to assemble, have unreasonable structures, and need to be optimized and improved. Summary of the Invention

[0007] In order to overcome the disadvantages and deficiencies existing in the prior art, the purpose of the present utility model is to provide an anti - tipping device for a boom and a crane thereof, so as to solve the problem that the installation and disassembly of the anti - tipping rod of the existing crane require high - altitude operations and pose safety hazards.

[0008] The purpose of the present utility model is achieved through the following technical solutions:

[0009] The present utility model provides an anti - tipping device for a boom, including a main telescopic rod, a secondary telescopic rod, a positioning plate, and a driving mechanism. One ends of the main telescopic rod and the secondary telescopic rod are both rotatably connected to a support rod. The secondary telescopic rod is arranged closer to the connection end of the support rod and the boom relative to the main telescopic rod. The other end of the secondary telescopic rod cooperates with the main telescopic rod and is used to control the rotation angle between the main telescopic rod and the support rod. The driving mechanism is used to drive the main telescopic rod and the secondary telescopic rod to extend and retract. The positioning plate is installed on the boom, and a positioning groove is provided on the positioning plate. The other end of the main telescopic rod is a free end and cooperates with the positioning groove.

[0010] Furthermore, a sliding plate is provided on the main telescopic rod. One end of the secondary telescopic rod that cooperates with the main telescopic rod is provided with a fork joint, and the fork joint is provided with a fork groove that cooperates with the sliding plate.

[0011] Furthermore, the side of the sliding plate facing the fork groove is a wedge - shaped structure, and the side of the fork groove facing the sliding plate is an inverted "eight" - shaped structure.

[0012] Furthermore, one end of the secondary telescopic rod facing the fork joint is provided with a ball head, and the fork joint is provided with an installation groove that cooperates with the ball head. The fork joint can rotate on the ball head;

[0013] A limiting block is provided near the ball head of the secondary telescopic rod, and the limiting block is used to limit the rotation angle of the fork joint in the direction perpendicular to the length direction of the sliding plate.

[0014] Furthermore, a chain is provided between the sliding plate and the fork joint, and the sliding plate and the fork joint are connected by the chain.

[0015] Furthermore, the end of the secondary telescopic rod far from the support rod is hinged to the main telescopic rod.

[0016] Further, the main telescopic rod is a telescopic oil cylinder or a telescopic air cylinder; the auxiliary telescopic rod is a telescopic oil cylinder, a telescopic air cylinder or a nut screw rod structure.

[0017] Further, the positioning plate is provided with a position sensor at the bottom of the positioning groove, and the position sensor is used to detect whether the free end of the main telescopic rod enters the positioning groove;

[0018] The positioning plate is provided with a guiding inclined surface inclined towards the positioning groove, and the guiding inclined surface extends from the positioning groove towards the strut side.

[0019] A crane according to the present application includes a boom, a strut, a pull plate, and the boom anti-tipping device as described above. One end of the strut is rotatably connected to one end of the boom, and both ends of the pull plate are respectively connected to the other end of the strut and the other end of the boom. One ends of the main telescopic rod and the auxiliary telescopic rod of the boom anti-tipping device are both rotatably connected to the strut, and the positioning plate of the boom anti-tipping device is installed on the boom.

[0020] Further, the boom includes a main boom and an auxiliary boom, the pull plate includes a rear pull plate and a front pull plate. One end of the main boom, one end of the auxiliary boom, and one end of the strut are connected to each other. Both ends of the rear pull plate are respectively connected to the other end of the strut and the other end of the main boom, and both ends of the front pull plate are respectively connected to the other end of the strut and the other end of the auxiliary boom;

[0021] The crane includes a rear anti-tipping rod and a front anti-tipping rod. The front anti-tipping rod adopts the boom anti-tipping device, or both the rear anti-tipping rod and the front anti-tipping rod adopt the boom anti-tipping device.

[0022] The beneficial effects of the present utility model are as follows: The main telescopic rod and the auxiliary telescopic rod are driven to expand and contract by a driving mechanism. The auxiliary telescopic rod cooperates with the main telescopic rod and is used to control the rotation angle between the main telescopic rod and the strut. Then, the end of the main telescopic rod far from the strut is set as a free end and is matched with the positioning groove on the positioning plate, so that the crane does not require workers to work at high altitudes, providing safety, work efficiency, and accuracy. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of a crane in the prior art after the boom is raised;

[0024] Figure 2 is a schematic structural diagram of an anti-tipping rod in the prior art;

[0025] Figure 3 is a schematic structural diagram of the crane in the present utility model when the main telescopic rod is not extended;

[0026] Figure 4It is a schematic structural diagram of the crane in the present utility model after the main telescopic rod is extended;

[0027] Figure 5 It is Figure 4 an enlarged schematic diagram of part A in

[0028] Figure 6 It is an enlarged schematic diagram of part B in the present utility model before the main telescopic rod enters the slot Figure 5 in

[0029] Figure 7 It is an enlarged schematic diagram of part C in the present utility model before the main telescopic rod enters the slot Figure 5 in

[0030] Figure 8 It is Figure 5 an enlarged schematic diagram of part D in

[0031] Figure 9 It is an enlarged schematic diagram of part B in the present utility model after the main telescopic rod enters the slot Figure 5 in

[0032] Figure 10 It is an enlarged schematic diagram of part C in the present utility model after the main telescopic rod enters the slot Figure 5 in

[0033] Figure 11 It is a schematic structural diagram of the main telescopic rod and the auxiliary telescopic rod cooperating with each other in the present utility model;

[0034] Figure 12 It is one of the schematic structural diagrams of the auxiliary telescopic rod in the present utility model;

[0035] Figure 13 It is the second schematic structural diagram of the auxiliary telescopic rod in the present utility model;

[0036] Figure 14 It is one of the disassembled structural diagrams of the auxiliary telescopic rod in the present utility model;

[0037] Figure 15 It is the second disassembled structural diagram of the auxiliary telescopic rod in the present utility model;

[0038] Figure 16 It is a schematic structural diagram of the crane in the present utility model after the boom is lowered.

[0039] In the figure: boom anti-tipping device 10, main telescopic rod 11, slide plate 111, chain 112, secondary telescopic rod 12, fork joint 121, fork groove 121a, installation groove 121b, bottom cover 121c, ball head 122, limit block 123, positioning plate 13, positioning groove 131, position sensor 132, guiding inclined surface 133, boom 20, main boom 21, secondary boom 22, support rod 30, pull plate 40, rear pull plate 41, front pull plate 42, rear anti-tipping rod 51, front anti-tipping rod 52. Detailed implementation manners

[0040] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined utility model purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and effects of the boom anti-tipping device and its crane proposed according to the present invention as follows:

[0041] [Embodiment 1]

[0042] Figure 3 It is a schematic structural view of the crane in the present invention when the main telescopic rod is not extended. Figure 4 It is a schematic structural view of the crane in the present invention after the main telescopic rod is extended. Figure 5 It is Figure 4 An enlarged schematic view of part A in Figure 6 It is before the main telescopic rod enters the groove in the present invention Figure 5 An enlarged schematic view of part B in Figure 7 It is before the main telescopic rod enters the groove in the present invention Figure 5 An enlarged schematic view of part C in Figure 8 It is Figure 5 An enlarged schematic view of part D in Figure 9 It is after the main telescopic rod enters the groove in the present invention Figure 5 An enlarged schematic view of part B in Figure 10 It is after the main telescopic rod enters the groove in the present invention Figure 5 An enlarged schematic view of part C in

[0043] As Figures 3 to 10As shown in the figure, an anti-tipping device for a boom provided in the first embodiment of the present utility model includes a main telescopic rod 11, a secondary telescopic rod 12, a positioning plate 13 and a driving mechanism. One end of both the main telescopic rod 11 and the secondary telescopic rod 12 is rotatably connected to a support rod 30. The secondary telescopic rod 12 is arranged closer to the connection end of the support rod 30 and the boom 20 relative to the main telescopic rod 11, that is, the connection point of the secondary telescopic rod 12 and the support rod 30 is closer to the connection point of the support rod 30 and the boom 20 than the connection point of the main telescopic rod 11 and the support rod 30. The other end of the secondary telescopic rod 12 cooperates with the main telescopic rod 11 and is used to control the rotation angle between the main telescopic rod 11 and the support rod 30. The driving mechanism is used to drive the main telescopic rod 11 and the secondary telescopic rod 12 to expand and contract. The positioning plate 13 is installed on the boom 20. A positioning groove 131 is provided on the positioning plate 13. The other end of the main telescopic rod 11 is a free end (that is, it can move freely and is not connected to other components) and cooperates with the positioning groove 131, that is, the end of the main telescopic rod 11 away from the support rod 30 is not connected to the boom 20, can move freely and detach from the boom 20.

[0044] In the present utility model, the driving mechanism is used to drive the main telescopic rod 11 and the secondary telescopic rod 12 to expand and contract. The secondary telescopic rod 12 cooperates with the main telescopic rod 11 and is used to control the rotation angle between the main telescopic rod 11 and the support rod 30. Then, the end of the main telescopic rod 11 away from the support rod 30 is set as a free end and cooperates with the positioning groove 131 on the positioning plate 13, so that the crane does not require workers to work at high altitudes, providing safety, work efficiency and accuracy.

[0045] Furthermore, the main telescopic rod 11 is a telescopic oil cylinder or a telescopic air cylinder; the secondary telescopic rod 12 is a telescopic oil cylinder, a telescopic air cylinder or a nut-screw structure. Since the telescopic stroke of the secondary telescopic rod 12 is short, a nut-screw structure can be adopted. Optionally, both the main telescopic rod 11 and the secondary telescopic rod 12 are telescopic oil cylinders, and the driving mechanism is a hydraulic system on the crane, so that both the main telescopic rod 11 and the secondary telescopic rod 12 can be driven by the hydraulic system.

[0046] Furthermore, as Figure 6As shown in the figure, a position sensor 132 is provided at the bottom of the positioning groove 131 of the positioning plate 13. The position sensor 132 is used to detect whether the free end of the main telescopic rod 11 enters the positioning groove 131. The position sensor 132 can be an inductive switch, or can be replaced by an infrared sensor or other form of electrical signal switch. The positioning plate 13 is provided with a guiding inclined surface 133 that inclines towards the positioning groove 131. The guiding inclined surface 133 extends from the positioning groove 131 towards the side of the support rod 30. When the main telescopic rod 11 extends, the guiding inclined surface 133 can guide the free end of the main telescopic rod 11 to ensure that the free end of the main telescopic rod 11 can slide into the positioning groove 131. Optionally, in order to reduce friction, the free end of the main telescopic rod 11 can adopt a curved surface structure, such as a hemispherical structure, so that the free end of the main telescopic rod 11 can slide into the positioning groove 131 more easily.

[0047] In this embodiment, a sliding plate 111 is provided on the main telescopic rod 11. One end of the secondary telescopic rod 12 that cooperates with the main telescopic rod 11 is provided with a fork joint 121. The fork joint 121 is provided with a fork groove 121a that cooperates with the sliding plate 111. That is, the secondary telescopic rod 12 and the main telescopic rod 11 are not directly connected. When it is necessary to drive the main telescopic rod 11 to rotate, the fork joint 121 is inserted into the sliding plate 111 of the main telescopic rod 11, so that the extension of the secondary telescopic rod 12 can drive the main telescopic rod 11 to rotate relative to the support rod 30; after the arm is laid down, the main telescopic rod 11 can basically rotate to be parallel to the support rod 30, and the space occupied after the secondary telescopic rod 12 and the main telescopic rod 11 are folded is relatively small. Of course, in other embodiments, the end of the secondary telescopic rod 12 far from the support rod 30 is directly hinged to the main telescopic rod 11, but the space occupied after the secondary telescopic rod 12 and the main telescopic rod 11 are folded is slightly larger.

[0048] Further, a chain 112 is provided between the sliding plate 111 and the fork joint 121. The sliding plate 111 and the fork joint 121 are connected by the chain 112. After the fork joint 121 slides on the sliding plate 111, it can ensure that the secondary telescopic rod 12 can drive the main telescopic rod 11 to retract along the designed path.

[0049] Figure 11 It is a schematic structural diagram when the main telescopic rod and the secondary telescopic rod cooperate with each other in the present utility model. As Figure 11 shown, further, the side of the sliding plate 111 facing the fork groove 121a is a wedge-shaped structure, and the side of the fork groove 121a facing the sliding plate 111 is an inverted "eight" character structure, that is, the cross-section of the sliding plate 111 in the direction perpendicular to the length of the main telescopic rod 11 is a sharp angle shape, so as to facilitate the forking connection between the fork joint 121 and the sliding plate 111.

[0050] Figure 12 It is one of the schematic structural diagrams of the secondary telescopic rod in the present utility model. Figure 13 It is the second schematic structural diagram of the secondary telescopic rod in the present utility model. Figure 14It is one of the schematic diagrams of the split structure of the secondary telescopic rod in the present utility model. Figure 15 It is the second schematic diagram of the split structure of the secondary telescopic rod in the present utility model. As Figures 12 to 15 shown, further, a ball head 122 is provided at one end of the secondary telescopic rod 12 facing the fork joint 121, and the fork joint 121 is provided with a mounting groove 121b for cooperating with the ball head 122. The fork joint 121 can rotate on the ball head 122, so as to realize different-angle cooperation with the main telescopic rod 11. A limiting block 123 is provided near the ball head 122 of the secondary telescopic rod 12. The limiting block 123 is used to limit the rotation angle of the fork joint 121 in the direction perpendicular to the length direction of the sliding plate 111. For example, if the length direction of the sliding plate 111 is the front-back direction, the limiting block 123 is used to limit the rotation angle of the fork joint 121 in the left-right direction, which can prevent the fork joint 121 from deflecting too much in the left-right direction, resulting in the fork joint 121 being unable to fork on the sliding plate 111.

[0051] Among them, the fork joint 121 is provided with a bottom cover 121c. A hemispherical groove is provided on one side of the fork joint 121 facing the bottom cover 121c, and a hemispherical groove is provided on one side of the bottom cover 121c facing the fork joint 121. The fork joint 121 and the bottom cover 121c are connected by bolts to form a spherical mounting groove 121b.

[0052] As Figures 3 to 5 shown, the present application also provides a crane, including a boom 20, a strut 30, a pull plate 40, and the boom anti-tipping device 10 as described above. One end of the strut 30 is rotatably connected to one end of the boom 20, and both ends of the pull plate 40 are respectively connected to the other end of the strut 30 and the other end of the boom 20, that is, one end of the pull plate 40 is connected to the end of the strut 30 far from the boom 20, and the other end of the pull plate 40 is connected to the end of the boom 20 far from the strut 30. One ends of the main telescopic rod 11 and the secondary telescopic rod 12 of the boom anti-tipping device 10 are both rotatably connected to the strut 30. The secondary telescopic rod 12 is arranged relative to the main telescopic rod 11 closer to the connection end of the strut 30 and the boom 20. The positioning plate 13 of the boom anti-tipping device 10 is installed on the boom 20.

[0053] In this embodiment, the boom 20 includes a main boom 21 and a sub-boom 22, the drawplate 40 includes a rear drawplate 41 and a front drawplate 42, one end of the main boom 21, one end of the sub-boom 22, and one end of the strut 30 are connected to each other, both ends of the rear drawplate 41 are respectively connected to the other end of the strut 30 and the other end of the main boom 21, and both ends of the front drawplate 42 are respectively connected to the other end of the strut 30 and the other end of the sub-boom 22. The crane includes a rear anti-tipping bar 51 and a front anti-tipping bar 52. The front anti-tipping bar 52 adopts the boom anti-tipping device 10. Since the installation of the rear anti-tipping bar 51 does not require working at height, therefore, the rear anti-tipping bar 51 can adopt a conventional spring-type telescopic anti-tipping bar or a pin-type anti-tipping bar. Of course, in other embodiments, both the front anti-tipping bar 52 and the rear anti-tipping bar 51 can also adopt the boom anti-tipping device 10.

[0054] Wherein, the crane further includes a crawler, an engine, a cab, a hydraulic system, a hoisting system, etc. As for other structures of the crane, reference can be made to the prior art and will not be elaborated here.

[0055] The boom raising process of the crane in this application includes: connecting the main boom 21, the sub-boom 22, the strut 30, the rear drawplate 41, and the front drawplate 42 respectively with the help of an auxiliary crane, pulling the strut 3 forward with the auxiliary crane until the rear drawplate 41 is straightened, connecting the rear anti-tipping bar 51, and inserting the positioning pin of the rear anti-tipping bar 51 into the positioning pin hole for positioning; then raising the boom and lifting the main boom 21 to straighten the front drawplate 42, fully extending the sub-expansion rod 12, and the main expansion rod 11 is towed by the sub-expansion rod 12 and pushed to the highest position. At this time, extend the main expansion rod 11 forward, and the main expansion rod 11 contacts the guiding inclined surface 133 of the positioning plate 13 on the sub-boom 22 ( Figure 6 ), continue to extend the main expansion rod 11 forward. Under the guiding action of the guiding inclined surface 133, the free end of the main expansion rod 11 slides forward until the position sensor 132 outputs a signal. At this time, the main expansion rod 11 stops moving, that is, the main expansion rod 11 automatically enters the slot ( Figure 9 ), release the auxiliary crane, and the boom raising is completed.

[0056] The boom lowering process includes: the main boom 21 first lowers forward by a certain angle. Before the sub-boom 22 lands, lift the strut 30 with an auxiliary crane, and fully retract the main expansion rod 11 and the sub-expansion rod 12; continue to lower the main boom 21. After the main boom 21 lands, remove the pin connecting one end of the rear anti-tipping bar 51 to the main boom 5, and remove the positioning pin on the rear anti-tipping bar 51. Tie the rear anti-tipping bar 51 to the strut 30, the staff evacuates, and lower the strut 30 forward, and the boom lowering is completed ( Figure 16 ).

[0057] Therefore, neither the boom raising process nor the boom lowering process of the crane requires the staff to work at height, which improves safety, work efficiency, and accuracy.

[0058] In this text, the orientation terms such as up, down, left, right, front, and back are defined based on the positions of the structures in the attached drawings and their relative positions to each other, solely for the clarity and convenience of expressing the technical solution. It should be understood that the use of these orientation terms should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second" used in this text are only for name differentiation and do not limit the quantity and sequence.

[0059] The above are only the preferred embodiments of the present utility model and do not impose any formal limitations on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art, without departing from the scope of the technical solution of the present utility model, may make some changes or modifications using the technical content disclosed above, which are equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A boom anti-tilt device, characterized in that: The invention comprises a main telescopic rod (11), a secondary telescopic rod (12), a positioning plate (13) and a driving mechanism, wherein one end of the main telescopic rod (11) and the secondary telescopic rod (12) are both rotatably connected to a support rod (30), the secondary telescopic rod (12) is arranged relative to the main telescopic rod (11) and close to the connection end of the support rod (30) and an arm frame (20), the other end of the secondary telescopic rod (12) cooperates with the main telescopic rod (11) and is used to control the rotation angle between the main telescopic rod (11) and the support rod (30), the driving mechanism is used to drive the main telescopic rod (11) and the secondary telescopic rod (12) to extend and retract, the positioning plate (13) is installed on the arm frame (20), a positioning groove (131) is provided on the positioning plate (13), and the other end of the main telescopic rod (11) is a free end and cooperates with the positioning groove (131).

2. The boom anti-tilt device according to claim 1, characterized in that: The main telescopic rod (11) is provided with a slide plate (111), and one end of the auxiliary telescopic rod (12) that matches with the main telescopic rod (11) is provided with a fork joint (121), and the fork joint (121) is provided with a fork groove (121a) that matches with the slide plate (111).

3. The boom anti-tilt device according to claim 2, characterized in that: The side of the slide plate (111) facing the fork groove (121a) is a wedge-shaped structure, and the side of the fork groove (121a) facing the slide plate (111) is an inverted "eight"-shaped structure.

4. The boom anti-tilt device according to claim 2, characterized in that: The auxiliary telescopic rod (12) is provided with a ball head (122) at one end facing the fork joint (121); the fork joint (121) is provided with a mounting groove (121b) matched with the ball head (122); and the fork joint (121) is capable of rotating on the ball head (122); The auxiliary telescopic rod (12) is provided with a limit block (123) near the ball head (122), and the limit block (123) is used to limit the rotation angle of the fork joint (121) in a direction perpendicular to the length of the slide plate (111).

5. The boom anti-tilt device according to claim 2, characterized in that: A chain (112) is provided between the slide plate (111) and the fork joint (121), and the slide plate (111) and the fork joint (121) are connected via the chain (112).

6. The boom anti-tilt device according to claim 1, characterized in that: One end of the auxiliary telescopic rod (12) away from the support rod (30) is hinged to the main telescopic rod (11).

7. The boom anti-tilt device according to any one of claims 1 to 6, characterized in that: The main telescopic rod (11) is a telescopic oil cylinder or a telescopic air cylinder; the auxiliary telescopic rod (12) is a telescopic oil cylinder, a telescopic air cylinder or a nut screw rod structure.

8. The boom anti-tilt device according to any one of claims 1 to 6, characterized in that: The positioning plate (13) is provided with a position sensor (132) at the bottom of the positioning groove (131), and the position sensor (132) is used to detect whether the free end of the main telescopic rod (11) enters the positioning groove (131); The positioning plate (13) is provided with a guiding inclined surface (133) inclined toward the positioning groove (131), and the guiding inclined surface (133) extends from the positioning groove (131) toward one side of the support rod (30).

9. A crane, characterized in that: It comprises a boom (20), a strut (30), a pull plate (40) and a boom anti-tilt device (10) as described in any one of claims 1 to 8, wherein one end of the strut (30) is rotatably connected to one end of the boom (20), two ends of the pull plate (40) are respectively connected to the other end of the strut (30) and the other end of the boom (20), one end of the main telescopic rod (11) and the auxiliary telescopic rod (12) of the boom anti-tilt device (10) are both rotatably connected to the strut (30), and the positioning plate (13) of the boom anti-tilt device (10) is installed on the boom (20).

10. The crane according to claim 9, characterized in that The arm frame (20) comprises a main arm (21) and a secondary arm (22); the pull plate (40) comprises a rear pull plate (41) and a front pull plate (42); one end of the main arm (21), one end of the secondary arm (22) and one end of the support rod (30) are connected to each other; two ends of the rear pull plate (41) are respectively connected to the other end of the support rod (30) and the other end of the main arm (21); and two ends of the front pull plate (42) are respectively connected to the other end of the support rod (30) and the other end of the secondary arm (22); The crane comprises a rear anti-roll bar (51) and a front anti-roll bar (52); the front anti-roll bar (52) adopts the boom anti-roll device (10), or both the rear anti-roll bar (51) and the front anti-roll bar (52) adopt the boom anti-roll device (10).

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