A cantilever rotating crane with adjustable counterweight

Abstract

The invention belongs to the technical field of lifting equipment, and discloses a cantilever rotating crane with adjustable counterweight, comprising a supporting column, a cantilever beam rotatably connected to the supporting column, a sliding trolley slidably connected to the left side of the cantilever beam, a guide plate fixedly connected to the right side of the lower end of the cantilever beam, a sliding counterweight block slidably connected to the guide plate, the sliding counterweight block is placed on a side away from the sliding trolley, the sliding counterweight block is connected to a traction device connected to the cantilever beam, the sliding counterweight block is driven by the traction device, the lower end of the sliding counterweight block is fixedly connected to a hanging column, the lower end of the hanging column is fixedly connected to a counterweight adjustment box, the lower end of the counterweight adjustment box is fixedly connected to a filling straight pipe, the filling straight pipe is rotatably connected to a screw conveying paddle, the lower end of the filling straight pipe is fixedly connected to a filling hose, the lower end of the filling hose is fixedly connected to a screw conveyor, the screw conveyor is connected to a storage box placed on the ground, and the storage box is provided with counterweight material; and the invention has strong practicality.

Description

Technical Field

[0001] The invention relates to the technical field of lifting equipment, in particular to a cantilever rotary crane with adjustable counterweight. Background Art

[0002] At present, cantilever cranes usually include a base, a column, a cantilever beam, an electric hoist, a support beam, a slewing mechanism and a control system. During operation, the electric hoist or the sliding trolley moves along the cantilever beam. The crane consists of a column, a slewing arm slewing drive device and an electric hoist. The lower end of the column is fixed to the concrete foundation by anchor bolts. The cantilever is driven to rotate by the cycloidal pinwheel reduction device in the slewing mechanism. The electric hoist runs in a straight line left and right on the cantilever beam and lifts heavy objects.

[0003] The Chinese patent with application number CN202410306610.8 discloses a counterweight adjustment mechanism for a crane. The above patent can improve the stability of the crane. Through the design of the counterweight adjustment structure, the position and lever arm of the counterweight can be adjusted in real time according to the actual working state and load condition of the crane, so as to maintain the stability of the crane and effectively reduce the risk of accidents. At the same time, it can enhance the applicability of the crane. The counterweight adjustment mechanism has a large adjustment range. Through the extension and rotation of the first telescopic rod and the second telescopic rod, the counterweight block can be located at a suitable position in the front-to-back direction, close to the rotating part or the fixed counterweight structure, to adapt to different working requirements and load conditions. While being limited by the rotation angle, by setting two counterweight adjustment mechanisms in different positions to adapt to a variety of working angles, the adaptability of the crane in different terrains and workplaces can be effectively enhanced.

[0004] The Chinese patent with application number CN202311457476.3 discloses a marine lifting and rescue equipment. In this application, a counterweight is set. Since the counterweight is opposite to the weight relative to the support seat, the torque equals the product of the force and the arm, so it can balance the torque of the weight on the support seat, and the slide is set as an elastic support, and the counterweight is linked to the slide by a lever, so that the counterweight can adaptively adjust the force arm of the counterweight on the big arm according to the specific weight of the lifting, so as to ensure the reliability of the moment balance, increase the stability of the hull and increase the safety. By setting an elastic body to sense the gravity of the counterweight, the size of the two side arms of the lever is controlled by the slider, and the height of the mounting seat and the slider is matched by the rod, so that when lifting, the arm adjustment amplitude of the counterweight is negatively correlated with the weight of the counterweight, and combined with the characteristic that the torque is equal to the product of the arm and the force, the relative stability of the balancing torque can be ensured, thereby increasing the reliability of the moment balance and the stability of the equipment. By setting a bidirectional screw rod, it can synchronously drive the two sliding arms to move in opposite directions. On the one hand, the lifting distance can be adjusted according to the actual needs. On the other hand, the counterweight of the counterweight block can be synchronously adjusted according to the change of the lifting arm, which further increases the stability. By setting the entire rope pulley group as a combination of rope 1, rope 2 and fixed pulley 1, rope 2 is relatively fixed, and the winch applies a force to rope 1, so that the required pulling force is only half of the weight, thereby reducing the load of the winch. On the basis of the combined lifting of rope 1, rope 2 and rope 3, the end of rope 2 is wound through a drum, and the drum is matched with the transmission of the boom through the gear and the tooth groove, so that when the position of the sliding arm is adjusted and the length of rope 1 increases or decreases, rope 2 can be synchronously reduced or increased in length, so that the overall length of rope 1, rope 2 and rope 3 remains unchanged, and the height of the drum is inconvenient, thereby further increasing the stability of the heavy object during the lifting process. However, the following problems still exist in actual applications, specifically:

[0005] 1. Most of the counterweights of existing cantilever cranes are in a fixed position. During the lifting process of objects of different weights, the stress distribution on the cantilever beam will be uneven, which will lead to unbalanced force on the cantilever beam and affect its service life.

[0006] 2. For cantilever cranes with counterweight adjustment, most of them move the counterweight block in a small range to achieve the purpose of adapting to the weight of the hoisted object. The adjustment range is small. At the same time, when hoisting objects with heavier weights, the effect of adaptive counterweight adjustment cannot be achieved due to the limited sliding distance. The overall mass of the counterweight is not easy to adjust and is only limited to the adjustment of the position;

[0007] 3. During high-altitude operations, high-strength airflows will affect the sliding configuration blocks and the sliding trolley, causing the sliding trolley or counterweight block to shake or slide slightly, affecting the stability of the equipment and lifting.

[0008] Therefore, the present invention provides a cantilever rotary crane with adjustable counterweight to solve the above problems. Summary of the invention

[0009] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a cantilever rotary crane with adjustable counterweight, which effectively solves the problems of adjusting the position of the counterweight and the overall mass of the counterweight according to the weight of the hoisted object, windproofing the counterweight block and the sliding trolley, and adjusting the mass of the counterweight block.

[0010] The present invention comprises a support column, a cantilever beam is rotatably connected to the support column, a sliding trolley is slidably connected to the left side of the cantilever beam, the sliding trolley slides inside the cantilever beam, and lifting is achieved by the sliding trolley, a guide plate is fixedly connected to the right side of the lower end of the cantilever beam, a sliding counterweight is slidably connected to the guide plate, the sliding counterweight is placed on a side away from the sliding trolley, the sliding counterweight is connected to a traction device connected to the cantilever beam, and the sliding counterweight is driven by the traction device;

[0011] The lower end of the sliding counterweight block is fixedly connected to a suspension column, the lower end of the suspension column is fixedly connected to a counterweight adjusting box, the lower end of the counterweight adjusting box is fixedly connected to a filling straight pipe, the inside of the filling straight pipe is rotatably connected to a screw conveying paddle, the screw conveying paddle is connected to a driving motor at the upper end of the counterweight adjusting box, the lower end of the filling straight pipe is fixedly connected to a filling hose, the lower end of the filling hose is fixedly connected to a screw conveyor, the screw conveyor is connected to a storage box placed on the ground, the storage box has counterweight material placed inside, and the counterweight material inside the storage box is transported to the inside of the filling hose through the screw conveyor.

[0012] Preferably, the traction device comprises a door frame fixedly connected to the cantilever beam, three groups of coaxially fixedly connected rotating traction rollers are rotatably connected inside the door frame, the three groups of rotating traction rollers rotate synchronously, three groups of storage rollers cooperating with the rotating traction rollers are rotatably connected to the right end of the cantilever beam, an electrorheological fluid tube is wound between the rotating traction roller and the storage roller in the middle, the electrorheological fluid tube is filled with electrorheological fluid, and the electrorheological fluid tube is externally connected to a power source;

[0013] A winding steel wire is wound between the corresponding rotating traction rollers and storage rollers on the left and right sides. The sliding counterweight block is driven to slide through the rotation of the rotating traction rollers and storage rollers, thereby adjusting the position of the sliding counterweight block and adjusting the counterweight.

[0014] Preferably, two symmetrically distributed supporting vertical plates are fixedly connected to the cantilever beam, and sliding tracks are provided on the two supporting vertical plates. A lifting slide is connected to the sliding track for sliding up and down movement. The lifting slide and the sliding track are connected by a spring, and a supporting shaft is connected between the two sliding tracks. Three groups of transfer rollers corresponding to the rotating traction rollers are rotatably connected to the supporting shaft, and the electrorheological fluid tube and the winding steel wire are guided by the transfer rollers.

[0015] Preferably, the counterweight adjustment box includes a main box, and both sides of the main box are slidably connected to sliding storage boxes, and the sliding of the sliding storage boxes can realize the adjustment of the storage space of the counterweight adjustment box. A support plate is fixedly connected to the middle position inside the main box, and the sliding storage box and the support plate are connected by a spring, and the spring is in a contracted state.

[0016] Preferably, an anti-backflow structure is connected between the straight filling pipe and the filling hose, and the anti-backflow structure includes a connecting pipe, the connecting pipe is thick in the middle and thin at both ends, and a lifting conical plug is connected to the inside of the connecting pipe so as to slide up and down, and the lifting conical plug is connected to the inside of the connecting pipe through a spring, a conical feed pipe is opened at the internal axis of the lifting conical plug, and an anti-backflow conical plug is connected to the inside of the conical feed pipe so as to slide up and down, and the anti-backflow conical plug and the connecting pipe are connected through a spring.

[0017] Preferably, a lifting electromagnetic plate is connected to the inside of the guide plate so as to slide up and down, a permanent magnet is fixedly connected to the inside of the guide plate, the lifting electromagnetic plate and the permanent magnet are connected by a spring, a plurality of equally spaced limiting teeth are fixedly connected to the upper end of the lifting electromagnetic plate, and a lifting rack matching the limiting teeth is fixedly connected to the lower end of the sliding counterweight block, and the limiting of the sliding counterweight block is achieved through the cooperation of the limiting teeth and the lifting rack.

[0018] Preferably, an oil storage bin is provided on the lower side of the supporting vertical plate, a lifting piston rod is slidably connected to the inside of the oil storage bin, the upper end of the lifting piston rod is connected to the lifting slide seat through a spring, and an oil outlet pipe is fixedly connected to the lower end of the oil storage bin, and the oil outlet pipe is connected to an external hydraulic buffer device.

[0019] Preferably, the sliding trolley and the sliding counterweight are both placed inside the cantilever beam, and both left and right ends of the cantilever beam are in the shape of arc surfaces.

[0020] The present invention improves the existing cantilever lifting equipment and has the following beneficial effects:

[0021] 1. By setting up the guide plate, sliding counterweight block, traction device, counterweight adjustment box, filling straight pipe, filling hose, screw conveyor, screw conveyor and other structures, the overall quality of the counterweight and the moving position of the counterweight can be effectively adjusted;

[0022] 2. The problem of moving and adjusting the sliding counterweight and auxiliary fixing the sliding counterweight is effectively solved by setting structures such as the door frame, rotating traction roller, storage roller, electrorheological fluid tube, winding steel wire, supporting vertical plate, lifting slide seat and transfer roller;

[0023] 3. The problem of backflow of counterweight material is effectively solved by setting up connecting pipes, lifting cone plugs, cone feed pipes, anti-backflow cone plugs and other structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional diagram of the present invention Figure 1 .

[0025] Figure 2 A three-dimensional diagram of the present invention Figure 2 .

[0026] Figure 3 It is a schematic diagram of the internal structure of the cantilever beam of the present invention.

[0027] Figure 4 It is a schematic diagram of the sliding counterweight block and its connecting parts of the present invention.

[0028] Figure 5 It is a schematic diagram of the internal structure of the backflow prevention structure of the present invention.

[0029] Figure 6 For the present invention Figure 5 Enlarged schematic diagram at point A in the middle.

[0030] Figure 7 This is a schematic diagram of the filling hose and its connecting parts of the present invention.

[0031] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of point B in the middle.

[0032] Fig. 9 It is a schematic diagram of the cantilever beam and its connecting parts of the present invention.

[0033] Fig.10 It is a schematic diagram of the lifting electromagnet and its connecting parts of the present invention.

[0034] 1. Support column; 2. Cantilever beam; 3. Sliding trolley; 4. Guide plate; 5. Sliding counterweight; 6. Suspension column; 7. Counterweight adjustment box; 8. Filling straight pipe; 9. Screw conveyor paddle; 10. Filling hose; 11. Screw conveyor; 13. Door frame; 14. Rotating traction roller; 15. Electrorheological fluid tube; 16. Winding wire; 17. Support vertical plate; 18. Sliding track; 19. Lifting slide seat; 20. Support shaft; 21. Transfer roller; 22. Main box; 23. Sliding storage box; 24. Support plate; 25. Connecting pipe; 26. Lifting conical plug; 27. Conical feed pipe; 28. Anti-backflow conical plug; 29. ​​Lifting electromagnetic plate; 30. Permanent magnet; 31. Limiting tooth; 32. Lifting rack; 33. Oil storage tank; 34. Lifting piston rod; 35. Oil outlet pipe; 36. Storage roller. DETAILED DESCRIPTION

[0035] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figures 1 to 10 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0036] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0037] The present invention is a cantilever rotating crane with adjustable counterweight, comprising a support column 1, the support column 1 provides a support foundation for subsequent structures, the support column 1 belongs to the main body of the crane, a cantilever beam 2 is rotatably connected to the support column 1, the cantilever beam 2 and the support column 1 are rotatably connected to realize the rotation of the cantilever beam 2, and then the lifting position is adjusted, the left side of the cantilever beam 2 is slidably connected to a sliding trolley 3, the sliding trolley 3 slides inside the cantilever beam 2, and the lifting is realized by the sliding trolley 3, the cantilever beam 2 is lowered A guide plate 4 is fixedly connected to the right side of the end, and a sliding counterweight 5 is slidably connected to the guide plate 4. The sliding counterweight 5 is placed on the side away from the sliding trolley 3. The sliding counterweight 5 is connected to the traction device connected to the cantilever beam 2. The driving of the sliding counterweight 5 is achieved by the traction device. The position of the sliding counterweight 5 is adjusted to adapt the counterweight to lifting objects of different sizes, thereby ensuring the stability of the cantilever beam 2 and avoiding uneven stress distribution of the cantilever beam 2, which in turn affects the overall stability.

[0038] The lower end of the sliding counterweight block 5 is fixedly connected to a hanging column 6, and the lower end of the hanging column 6 is fixedly connected to a counterweight adjustment box 7. The counterweight box is filled with counterweight material, and the counterweight can be adjusted again by filling different amounts of counterweight material. The lower end of the counterweight adjustment box 7 is fixedly connected to a filling straight pipe 8, and the filling straight pipe 8 is rotatably connected to a screw conveying paddle 9. The screw conveying paddle 9 is connected to a driving motor at the upper end of the counterweight adjustment box 7. The rotation of the driving motor drives the rotation of the screw conveying paddle 9 to realize the transportation of the counterweight material. At the same time, the forward and reverse rotation of the driving motor realizes the counterweight The material is transported in different directions. The lower end of the filling straight pipe 8 is fixedly connected to a filling hose 10, and the lower end of the filling hose 10 is fixedly connected to a screw conveyor 11. The screw conveyor 11 is connected to a material storage box placed on the ground. The material storage box is provided with counterweight material. The counterweight material in the material storage box is transported to the filling hose 10 through the screw conveyor 11. The screw conveyor 11 rotates to transport the counterweight material to the filling hose 10. At the same time, the counterweight material is transported to the counterweight adjustment box 7 through the screw conveying paddle 9, thereby realizing the self-balancing adjustment of the cantilever beam 2.

[0039] During the specific implementation of this embodiment, in the initial state, before lifting, the sliding counterweight 5 is located near the middle position of the cantilever beam 2. When lifting is required, the traction device is started to adjust the position of the sliding counterweight 5 according to the weight of the lift and the lifting position, and then the lift is lifted by the lifting equipment of the crane body. At the same time, when the lift is required to slide along the cantilever beam 2, the sliding trolley 3 is started to move the lift. At the same time, the sliding counterweight 5 moves accordingly to ensure the balance of the two ends of the cantilever beam 2, improve stability, and extend the service life of the cantilever beam 2.

[0040] In order to achieve effective driving of the sliding counterweight 5, the sliding counterweight 5 can be braked during the sliding process of the sliding counterweight 5 to prevent the sliding counterweight 5 from sliding during the operation of the equipment or from inertial sliding after sliding. Therefore, a structure for effectively driving the sliding counterweight 5 is provided. Specifically, the traction device includes a door frame 13 fixedly connected to the cantilever beam 2, and three groups of coaxially fixedly connected rotating traction rollers 14 are rotatably connected inside the door frame 13. The three groups of rotating traction rollers 14 rotate synchronously. The rotating traction rollers 14 are connected to the driving device connected to the door frame 13 to achieve forward and reverse driving of the rotating traction rollers 14. Three groups of storage rollers 36 cooperating with the rotating traction rollers 14 are rotatably connected to the right end of the cantilever beam 2. An electrorheological fluid tube 15 is wound between the rotating traction roller 14 and the storage roller 36 in the middle. The two ends of the electrorheological fluid tube 15 are respectively fixedly connected to the two ends of the sliding counterweight 5. The liquid tube 15 is filled with an electrorheological fluid, and the electrorheological fluid tube 15 is connected to an external power source. The state of the electrorheological fluid tube 15 is adjusted by turning the power on and off. The electrorheological fluid tube 15 is in a hard state when it is powered on, and in a soft state when it is powered off. A winding wire 16 is wound between the rotating traction roller 14 and the storage roller 36 corresponding to the left and right sides, and the two ends of the winding wire 16 are respectively connected to the sliding counterweight block The two ends of 5 are fixedly connected, and the sliding driving of the sliding counterweight block 5 is realized by the rotation of the rotating traction roller 14 and the storage roller 36, thereby realizing the adjustment of the position of the sliding counterweight block 5 and the adjustment of the counterweight. The sliding adjustment of the sliding counterweight block 5 is realized by the forward and reverse rotation of the rotating traction roller 14 and the storage roller 36. At the same time, the energization of the electrorheological fluid tube 15 is used to assist the positioning of the sliding counterweight block 5 to avoid the shaking problem of the sliding counterweight block 5.

[0041] During the rotation of the rotating traction roller 14 and the storage roller 36, the winding radius will gradually change. Therefore, in order to ensure the stability of the winding process and avoid extreme pulling, a structure for buffering the winding steel wire 16 and the electrorheological fluid tube 15 is provided. Specifically, two symmetrically distributed support vertical plates 17 are fixedly connected to the cantilever beam 2, and the two support vertical plates 17 are provided with sliding tracks 18. The sliding track 18 is internally connected with a lifting slide 19 for sliding up and down movement. The lifting slide 19 and the sliding track 18 are connected by a spring. The spring buffers the lifting and lowering of the lifting slide 19. A support shaft 20 is connected between the two sliding rails 18. Three groups of transfer rollers 21 corresponding to the rotating traction rollers 14 are rotatably connected to the support shaft 20. The electrorheological fluid tube 15 and the winding steel wire 16 are guided by the transfer rollers 21. During the pulling process of the electrorheological fluid tube 15 and the winding steel wire 16, the lifting slide 19 slides up and down, thereby realizing the adjustment of the position of the lifting slide 19, ensuring the stability of the winding and sliding of the electrorheological fluid tube 15 and the winding steel wire 16.

[0042] In order to ensure that the counterweight of the counterweight adjustment box 7 can be adjusted over a wide range, a structure for adjusting the storage space of the counterweight adjustment box 7 is provided. Specifically, the counterweight adjustment box 7 includes a main box 22, and the left and right sides of the main box 22 are slidably connected to sliding storage boxes 23. The sliding of the sliding storage box 23 realizes the adjustment of the storage space of the counterweight adjustment box 7. A support plate 24 is fixedly connected to the middle position inside the main box 22. The sliding storage box 23 and the support plate 24 are connected by a spring, and the spring is in a contracted state. Under the contraction action of the spring, the support plate 24 slides synchronously toward the middle of the main box 22, thereby making the counterweight adjustment box 7 in the minimum space. At the same time, in the process of filling the counterweight material into the main box 22, the counterweight material squeezes the sliding storage box 23, causing the sliding storage box 23 to slide, thereby ensuring that the counterweight material can be stored in time.

[0043] In the process of filling the balancing weight material, the balancing weight material may leak downward and flow back. In order to avoid the balancing weight material from diverting, an anti-backflow structure is provided. Specifically, an anti-backflow structure is connected between the filling straight pipe 8 and the filling hose 10. The anti-backflow structure includes a connecting pipe 25. The connecting pipe 25 is thick in the middle and thin at both ends. For details, please refer to the attached Figure 6The interior of the connecting pipe 25 is in the shape of two symmetrically distributed truncated cones. The interior of the connecting pipe 25 is connected to a lifting conical plug 26 that slides up and down. The lifting conical plug 26 is connected to the interior of the connecting pipe 25 through a spring. A conical feeding pipe 27 is provided at the axis of the lifting conical plug 26. An anti-backflow conical plug 28 is connected to the interior of the conical feeding pipe 27 that slides up and down. The anti-backflow conical plug 28 and the connecting pipe 25 are connected through a spring. When the counterweight material is conveyed upward, the anti-backflow conical plug 28 and the conical feeding pipe 27 are strongly fitted. The lifting conical plug 26 and the anti-backflow conical plug 28 slide synchronously to open the interior of the connecting pipe 25 to realize the upward conveying of the counterweight material. When the counterweight material is conveyed downward, the lifting conical plug 26 is stationary, and the anti-backflow conical plug 28 slides downward, thereby realizing the opening of the conical feeding pipe 27, which is convenient for the downward conveying of the counterweight material.

[0044] In order to effectively limit the sliding counterweight 5, an auxiliary limiting structure is provided. Specifically, a lifting electromagnetic plate 29 is connected to the guide plate 4 for sliding up and down movement, a permanent magnet 30 is fixedly connected to the guide plate 4, the lifting electromagnetic plate 29 and the permanent magnet 30 are connected by a spring, a plurality of equally spaced limiting teeth 31 are fixedly connected to the upper end of the lifting electromagnetic plate 29, a lifting rack 32 is fixedly connected to the lower end of the sliding counterweight 5 for matching with the limiting teeth 31, and the limiting of the sliding counterweight 5 is achieved by the cooperation of the limiting teeth 31 and the lifting rack 32. When the lifting electromagnetic plate 29 is energized, the lifting electromagnetic plate 29 and the permanent magnet 30 are attracted to each other, and the lifting electromagnetic plate 29 drives the limiting teeth 31 to slide synchronously, thereby unlocking the sliding counterweight 5 and facilitating the sliding of the sliding counterweight 5.

[0045] In order to achieve effective buffering and lifting of the lifting slide 19, an oil storage bin 33 is opened on the lower side of the supporting vertical plate 17, and a lifting piston rod 34 is slidably connected to the inside of the oil storage bin 33, and the upper end of the lifting piston rod 34 is connected to the lifting slide 19 through a spring, and the lower end of the oil storage bin 33 is fixedly connected to an oil outlet pipe 35, and the oil outlet pipe 35 is connected to an external hydraulic buffer device, and the hydraulic buffer device includes an oil storage barrel, and a sliding piston is slidably connected to the oil storage barrel, and the sliding piston and the oil storage barrel are connected through a spring, and the sliding of the sliding piston and the lifting piston rod 34 can realize the lifting and lowering adjustment of the lifting slide 19, thereby ensuring the lifting and lowering adjustment of the transfer roller 21.

[0046] The sliding trolley 3 and the sliding counterweight 5 are both placed inside the cantilever beam 2. The left and right ends of the cantilever beam 2 are both arc-shaped, which guide and buffer the airflow in the sky to prevent the airflow from directly acting on the sliding trolley 3 and the sliding counterweight 5, thereby preventing the sliding trolley 3 and the sliding counterweight 5 from sliding slightly under the action of wind.

[0047] When the present invention is used in practice, before lifting, the sliding counterweight block 5 is located near the middle position of the cantilever beam 2. When lifting is required, the traction device is started to adjust the position of the sliding counterweight block 5 according to the weight of the lifting object and the lifting position. When the sliding counterweight block 5 slides to the farthest end and is not enough to complete the counterweight adjustment, the screw conveyor 9 and the screw conveyor 11 are started to convey the counterweight material to the main box 22 and the sliding storage box 23 to adjust the weight of the counterweight and ensure the stability of the force at both ends of the cantilever beam 2. Then, the lifting object is lifted by the lifting equipment of the crane body. At the same time, when the lifting object needs to slide along the cantilever beam 2, the sliding trolley 3 is started to move the lifting object. At the same time, the sliding counterweight block 5 is correspondingly weighted, that is, the counterweight material is added to ensure the balance of the two ends of the cantilever beam 2, improve the stability, and extend the service life of the cantilever beam 2.

[0048] After the lifting is completed, the screw conveyor 9 and the screw conveyor 11 are turned over to discharge the counterweight material out of the main box 22 and the sliding storage box 23, thereby resetting the sliding counterweight block 5.

[0049] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A cantilever rotary crane with adjustable counterweight, comprising a support column (1), characterized in that: The support column (1) is rotatably connected to a cantilever beam (2), and a sliding trolley (3) is slidably connected to the left side of the cantilever beam (2). The sliding trolley (3) slides inside the cantilever beam (2), and lifting is achieved through the sliding trolley (3). A guide plate (4) is fixedly connected to the right side of the lower end of the cantilever beam (2), and a sliding counterweight (5) is slidably connected to the guide plate (4). The sliding counterweight (5) is placed on a side away from the sliding trolley (3). The sliding counterweight (5) is connected to a traction device connected to the cantilever beam (2), and the sliding counterweight (5) is driven by the traction device. The lower end of the sliding counterweight block (5) is fixedly connected to a suspension column (6), the lower end of the suspension column (6) is fixedly connected to a counterweight adjustment box (7), the lower end of the counterweight adjustment box (7) is fixedly connected to a filling straight pipe (8), the filling straight pipe (8) is rotatably connected to a screw conveying paddle (9), the screw conveying paddle (9) is connected to a driving motor at the upper end of the counterweight adjustment box (7), the lower end of the filling straight pipe (8) is fixedly connected to a filling hose (10), the lower end of the filling hose (10) is fixedly connected to a screw conveyor (11), the screw conveyor (11) is connected to a material storage box placed on the ground, the material storage box has counterweight material inside, and the counterweight material inside the material storage box is transported to the inside of the filling hose (10) through the screw conveyor (11).

2. The cantilever rotary crane with adjustable counterweight according to claim 1, characterized in that: The traction device comprises a door frame (13) fixedly connected to the cantilever beam (2), three groups of coaxially fixedly connected rotating traction rollers (14) are rotatably connected inside the door frame (13), the three groups of rotating traction rollers (14) rotate synchronously, three groups of storage rollers (36) matched with the rotating traction rollers (14) are rotatably connected to the right end of the cantilever beam (2), an electrorheological fluid tube (15) is wound between the rotating traction rollers (14) and the storage rollers (36), the two ends of the electrorheological fluid tube (15) are respectively fixedly connected to the two ends of the sliding counterweight (5), the electrorheological fluid tube (15) is filled with electrorheological fluid, and the electrorheological fluid tube (15) is externally connected to a power supply; A winding steel wire (16) is wound between the corresponding rotating traction rollers (14) and storage rollers (36) on the left and right sides, and the two ends of the winding steel wire (16) are respectively fixedly connected to the two ends of the sliding counterweight (5). The sliding counterweight (5) is driven to slide by the rotation of the rotating traction rollers (14) and the storage rollers (36), thereby adjusting the position of the sliding counterweight (5) and adjusting the counterweight.

3. The cantilever rotary crane with adjustable counterweight according to claim 2, characterized in that: The cantilever beam (2) is fixedly connected to two symmetrically distributed support vertical plates (17), and the two support vertical plates (17) are each provided with a sliding track (18). A lifting slide (19) is slidably connected to the inside of the sliding track (18), and the lifting slide (19) and the sliding track (18) are connected via a spring. A support shaft (20) is connected between the two sliding tracks (18), and three groups of transfer rollers (21) corresponding to the rotating traction rollers (14) are rotatably connected to the support shaft (20), and the electrorheological fluid tube (15) and the winding steel wire (16) are guided via the transfer rollers (21).

4. The cantilever rotary crane with adjustable counterweight according to claim 3, characterized in that: The counterweight adjustment box (7) comprises a main box (22), and the left and right sides of the main box (22) are both slidably connected to sliding storage boxes (23), and the sliding of the sliding storage boxes (23) can adjust the storage space of the counterweight adjustment box (7). A support plate (24) is fixedly connected to the middle position inside the main box (22), and the sliding storage box (23) and the support plate (24) are connected via a spring, and the spring is in a contracted state.

5. The cantilever rotary crane with adjustable counterweight according to claim 4, characterized in that: An anti-backflow structure is connected between the filling straight pipe (8) and the filling hose (10), and the anti-backflow structure includes a connecting pipe (25), the connecting pipe (25) is thick in the middle and thin at both ends, and a lifting conical plug (26) is connected to the inside of the connecting pipe (25) in a sliding manner, and the lifting conical plug (26) is connected to the inside of the connecting pipe (25) through a spring, and a conical feed pipe (27) is opened at the axis of the inside of the lifting conical plug (26), and an anti-backflow conical plug (28) is connected to the inside of the conical feed pipe (27) in a sliding manner, and the anti-backflow conical plug (28) and the connecting pipe (25) are connected through a spring.

6. The cantilever rotary crane with adjustable counterweight according to claim 5, characterized in that: The guide plate (4) is internally connected to a lifting electromagnetic plate (29) for sliding upward and downward movement, the guide plate (4) is internally fixedly connected to a permanent magnet (30), the lifting electromagnetic plate (29) and the permanent magnet (30) are connected via a spring, the upper end of the lifting electromagnetic plate (29) is fixedly connected to a plurality of equally spaced limiting teeth (31), the lower end of the sliding counterweight (5) is fixedly connected to a lifting rack (32) that cooperates with the limiting teeth (31), and the limiting of the sliding counterweight (5) is achieved through the cooperation of the limiting teeth (31) and the lifting rack (32).

7. The cantilever rotary crane with adjustable counterweight according to claim 6, characterized in that: An oil storage bin (33) is provided at the lower side of the supporting vertical plate (17), and a lifting piston rod (34) is slidably connected to the inside of the oil storage bin (33). The upper end of the lifting piston rod (34) is connected to the lifting slide seat (19) via a spring, and an oil outlet pipe (35) is fixedly connected to the lower end of the oil storage bin (33), and the oil outlet pipe (35) is connected to an external hydraulic buffer device.

8. The cantilever rotary crane with adjustable counterweight according to claim 1, characterized in that: The sliding trolley (3) and the sliding counterweight (5) are both placed inside the cantilever beam (2), and the left and right ends of the cantilever beam (2) are both in the shape of arc surfaces.

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