A lifting tool for hoisting large cable reels

Abstract

The present invention relates to a lifting tool for lifting large cable reels, belonging to the technical field of cable reel lifting tools. The present invention includes a lifting frame and a boom mechanism installed on the lifting frame. The boom mechanism includes two sets of boom combinations arranged symmetrically front and back, and each boom combination includes two sets of boom assemblies arranged symmetrically left and right; each boom assembly includes a boom and a support leg connected to the bottom end of the boom. The support leg is located on the side of the boom facing the center of the boom combination, and a first diagonal brace and a pressing member are provided on the support leg. The first diagonal brace is elastically slidably installed on the support leg along the direction inclined upward and toward the center of the boom combination from bottom to top; the first diagonal brace is used to elastically press against the circumferential side wall of the circular side plate in the cable reel as the two sets of left and right symmetric boom assemblies approach each other to support the cable reel. The present invention can provide a more firm support for the cable reel, avoid shaking between the cable reel and the lifting tool during the process of transporting the cable reel, and has a higher safety factor.

Description

Technical Field

[0001] The present invention relates to the technical field of cable reel lifting tools, and particularly to a lifting tool for hoisting large cable reels. Background Art

[0002] A cable reel is a device for storing, transporting, and laying electric wires and cables. It is usually made of wood, metal, or plastic, and includes a cylinder in the middle and two circular side plates connected to both ends of the cylinder in the axial direction of the cylinder. During the construction process, it is often necessary to transfer the cable reel. In order to transfer the cable reel more safely and efficiently and protect the cable from damage during the transfer process, a cable reel lifting tool is usually used to carry the cable reel. The cable reel lifting tool plays an important role in power engineering, construction sites, manufacturing, and other occasions where large cable reels need to be moved. Selecting a suitable cable reel lifting tool can not only improve work efficiency but also ensure the safety of operators.

[0003] In the existing cable reel lifting tools, the principle is usually to use a suspension arm to hook the cable reel and then carry the cable reel for transfer. For example, a cable reel hoisting tool disclosed in the patent with the authorization announcement number CN204778367U includes a suspension beam, a suspension arm, and a suspension arm locking mechanism. The upper end of the suspension beam is hung on the hook of the crane. The suspension arms are hinged and assembled on both the left and right sides of the suspension beam through pin shafts. The suspension arms include a left suspension arm and a right suspension arm. Symmetrically structured hook heads are provided at the lower ends of the left suspension arm and the right suspension arm. The suspension arm locking mechanism is assembled with the left suspension arm and the right suspension arm to limit the relative positions of the left suspension arm and the right suspension arm.

[0004] When using this lifting tool, the cable reel is hooked by the hook heads of the left suspension arm and the right suspension arm, and then the lifting tool is lifted by the crane to transfer the cable reel. However, the cable reel is only suspended on the lifting tool, and neither the axial position nor the circumferential position of the cable reel is fixed. During the transfer of the cable reel, the cable reel will shake. Frequent shaking will cause wear on the lifting tool and the cable reel, affect the stress conditions of the cable reel and the suspension structure, and shorten their service lives. For a wooden cable reel assembled by screw connections, long-term severe shaking is also likely to cause the screws to loosen, resulting in a series of safety hazards. Summary of the Invention

[0005] The present invention provides a lifting tool for hoisting large cable reels to solve the technical problems in the existing cable reel lifting tools that the cable reel cannot be fixed, the cable reel will shake during the transfer process, the service life of the lifting tool is short, and the safety factor is low.

[0006] To solve the above problems, the lifting tool for hoisting large cable reels provided by the present invention adopts the following technical solutions:

[0007] A lifting tool for a large cable reel, comprising a lifting frame and a boom mechanism mounted on the lifting frame. The boom mechanism includes two sets of boom combinations arranged symmetrically front and back and capable of approaching or separating from each other in the front-back direction. Each boom combination includes two sets of boom assemblies arranged symmetrically left and right and capable of approaching or separating from each other in the left-right direction.

[0008] Each boom assembly includes a boom and a support leg connected to the bottom end of the boom. The support leg is located on the side of the boom facing the center of the boom combination. The support leg is provided with a first diagonal brace and a pressing member. The first diagonal brace is elastically slidably mounted on the support leg along a direction inclined upward from bottom to top towards the center of the boom combination.

[0009] The first diagonal brace is used to elastically press against the circumferential side wall of the circular side plate in the cable reel as the two sets of left-right symmetric boom assemblies approach each other to support the cable reel.

[0010] The pressing member is used to block the circular side plate in the cable reel front and back after the first diagonal brace lifts the cable reel. The two sets of boom combinations are used to separate from each other after the first diagonal brace lifts the cable reel, so as to drive the front and back opposite pressing members to separate from each other, and make the front and back opposite pressing members press against the circular side plate from inside to outside to tighten the cable reel.

[0011] With the above technical solution, when lifting the cable reel, the left-right symmetric first diagonal braces approach each other to support the cable reel, and the front and back opposite pressing members separate from each other to tighten the cable reel. The pressing member tightens the cable reel, so that the cable reel is relatively fixed to the boom mechanism. The first diagonal brace supports the cable reel from bottom to top, preventing the cable reel from slipping under its own weight, so that the cable reel is firmly bound to the lifting tool. During the process of transporting the cable reel, the cable reel will not shake and cause mutual friction or collision with the lifting tool. The stress state of the lifting tool is more stable, which can effectively extend the service life of the lifting tool. During the process of transporting the cable reel, the cable reel will not fall off the lifting tool, and the safety factor is higher.

[0012] Furthermore, the boom can be telescopically extended up and down. The support leg includes a main body section and a movable section. The main body section is fixedly connected to the bottom end of the boom. The movable section is movably mounted on the end of the main body section facing away from the boom in the left-right direction. The first diagonal brace is mounted on the main body section. A second diagonal brace is mounted on the movable section. The second diagonal brace is located below the first diagonal brace. The second diagonal brace is used to press against the circumferential outer side wall of the circular side plate in the cable reel as the two sets of left-right symmetric boom assemblies approach each other.

[0013] With the above technical solution, the jib can be telescoped up and down. Combining with the above jib components that can move away from each other, the sling can be applied to transfer cable reels with various different outer diameters. The outrigger includes a main body section and a movable section. A second brace is provided on the movable section. The second brace and the first brace support the cable reel at the same time, avoiding stress concentration at the first brace and making the force on the cable reel more uniform. The movable section can slide in the left-right direction. When supporting a cable reel with a larger diameter, the movable section can extend away from the main body section to a position closer to the center of the cable reel, so as to support the cable reel more stably.

[0014] Further, the jib adopts a vertically extending lifting cylinder, and the lifting output end of the lifting cylinder faces downward. The main body section is connected to the lifting output end of the lifting cylinder.

[0015] Further, the lifting cylinder is in transmission connection with the movable section, and the movable section can be driven to move away from the main body section during the downward extension of the lifting output end of the lifting cylinder.

[0016] With the above technical solution, when the lifting cylinder extends, the movable section is driven to move away from the main body section. For a cable reel with a larger outer diameter, while adjusting the length of the jib, the position of the movable section is driven to be adjusted synchronously, and the adjustment efficiency is higher. A part of the power of the lifting cylinder is shared to adjust the position of the movable section, and there is no need to separately set a power component for adjusting the position of the movable section.

[0017] Further, a first hydraulic cylinder is fixedly installed on the cylinder body of the lifting cylinder. A first piston rod is vertically arranged in the first hydraulic cylinder, and the first piston rod is connected to the main body section. A second hydraulic cylinder is fixedly installed on the main body section. A second piston rod is arranged in the second hydraulic cylinder in the left-right direction, and the second piston rod is connected to the movable section. The inner cavities of the first hydraulic cylinder and the second hydraulic cylinder are communicated. During the downward movement of the driving output end of the lifting cylinder, the first piston rod is driven to move downward, so as to squeeze the hydraulic oil in the first hydraulic cylinder into the second hydraulic cylinder to drive the second piston rod to drive the movable section to move away from the main body section.

[0018] With the above technical solution, the transmission connection between the lifting cylinder and the movable section is realized through the communicated first hydraulic cylinder and second hydraulic cylinder, and the structure is simple and easy to implement.

[0019] Furthermore, a third hydraulic cylinder is installed on the main body section. A piston rod three is elastically inserted into the third hydraulic cylinder and is inclined upward from bottom to the center of the boom assembly. The first bracing member is connected to the top end of the piston rod three. A sealing chamber is provided on the movable section. A piston rod four is vertically inserted into the sealing chamber. The second bracing member is connected to the top end of the piston rod four. The inner cavity of the third hydraulic cylinder communicates with the sealing chamber. When not in contact with the cable reel, the first bracing member protrudes toward the center of the boom assembly beyond the second bracing member. During the process of the left and right symmetric boom assemblies approaching each other, the first bracing member is squeezed by the cable reel and drives the piston rod three to move downward, so as to squeeze the hydraulic oil in the third hydraulic cylinder into the sealing chamber, thereby driving the piston rod four to move upward and enabling the second bracing member to support on the circular side plate of the cable reel.

[0020] With the above technical solution, when the first bracing member is squeezed by the cable reel, it drives the second bracing member to move upward and support on the cable reel. For cable reels of different specifications, it can ensure that the second bracing member can support the cable reel. The movement of the first bracing member drives the movement of the second bracing member to support the cable reel, enabling the first bracing member and the second bracing member to adaptively support the cable reel, with a clever structure.

[0021] Furthermore, the squeezing member includes a fixed plate and a movable plate on the same plane. The fixed plate is fixedly connected to the main body section, and the movable plate is fixedly connected to the movable section.

[0022] Furthermore, a telescopic support rod extending in the front-back direction is connected between each two sets of squeezing members that are opposite in the front-back direction. The telescopic support rod includes a pipe section and a rod section movably inserted into the pipe section. A hydraulic oil supply assembly and a locking structure are connected to the movable section. The hydraulic oil supply assembly is used to inject hydraulic oil into the pipe section during the process of the rod section and the pipe section moving away from each other. The locking structure is used to lock the hydraulic oil in the inner cavity of the pipe section when the rod section and the pipe section are relatively stationary.

[0023] With the above technical solution, the telescopic support rod can strengthen the connection between the front-back opposite boom assemblies, making the structural strength of the entire lifting tool higher. The locking structure locks the hydraulic oil in the pipe section after the telescopic support rod extends, enabling the telescopic support rod to maintain at this length dimension state. When the cable reel or the lifting tool is collided by other objects during the process of transporting the cable reel, the length dimension of the telescopic support rod will not change, the lifting tool has higher strength, and the lifting tool is prevented from being deformed by the collision.

[0024] Furthermore, the telescopic support rod is connected between two opposite movable plates in the front-back direction.

[0025] Further, the hydraulic oil supply assembly includes a fourth hydraulic cylinder. The inner cavity of the fourth hydraulic cylinder communicates with the inner cavity of the pipe section. When the rod section and the pipe section move away from each other, the hydraulic oil in the fourth hydraulic cylinder is sucked into the inner cavity of the pipe section. The locking structure includes a trigger block that is elastically slidably mounted on the movable plate in the front-rear direction and a plug head connected to the trigger block. The trigger block is located at one end of the movable plate facing away from the telescopic support rod. The plug head passes through the movable plate in the front-rear direction and is inserted into the inner cavity of the pipe section. The trigger block is used to move towards the pipe section when being squeezed by the circular side plate of the cable reel during the process of tightening the cable reel, so as to drive the plug head to move in the pipe section to block the communication area between the pipe section and the fourth hydraulic cylinder.

[0026] With the above technical solution, while the movable plate presses on the cable reel to tighten the cable reel, the trigger block is squeezed to drive the plug head to block the area on the pipe section communicating with the fourth hydraulic cylinder, preventing the flow of hydraulic oil between the inner cavity of the pipe section and the fourth hydraulic cylinder, and realizing the locking of the telescopic support rod while the cable reel is tightened, with sensitive response and ingenious structure.

[0027] The beneficial effects of a lifting tool for large cables provided by the present invention are as follows: it can provide a more stable support for the cable reel, avoid shaking between the cable reel and the lifting tool during the process of transporting the cable reel, avoid friction and collision between the cable reel and the lifting tool, the service lives of the cable reel and the lifting tool are longer, the safety factor during the process of transporting the cable reel is higher, it can be applicable to cable reels of different sizes, and the applicable range is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the front view of a lifting tool for large cable reels provided by the present invention;

[0029] Figure 2 is the left view of a lifting tool for large cable reels provided by the present invention;

[0030] Figure 3 is the top view of a lifting tool for large cable reels provided by the present invention;

[0031] Figure 4 is the three-dimensional structure schematic diagram of a lifting tool for large cable reels provided by the present invention;

[0032] Figure 5 is Figure 4 the enlarged schematic diagram of the structure at A in

[0033] Figure 6 is the three-dimensional sectional view of a lifting tool for large cable reels provided by the present invention;

[0034] Figure 7 is Figure 6 the enlarged schematic diagram of the structure at B in

[0035] Figure 8Cross-sectional view of the telescopic support rod in a lifting tool for lifting a large cable reel provided by the present invention;

[0036] Figure 9 Cross-sectional view of a hydraulic cylinder in a lifting tool for lifting a large cable reel provided by the present invention;

[0037] Figure 10 Cross-sectional view of the cross beam in a lifting tool for lifting a large cable reel provided by the present invention;

[0038] Figure 11 Front view of the cable reel lifted by a lifting tool for lifting a large cable reel provided by the present invention;

[0039] Figure 12 Left view of the cable reel lifted by a lifting tool for lifting a large cable reel provided by the present invention.

[0040] Explanation of reference numerals:

[0041] 1. Baffle; 2. Cross beam; 201. Convex rib; 3. Suspension ring; 4. Driving motor 1; 5. Longitudinal guide rail; 6. Driving motor 2; 7. Vertical mounting plate; 8. Slide block 1; 9. Connecting rod; 10. Slide block 2; 11. Cylinder block; 12. Lifting output end; 13. Main body section; 131. Slope; 14. Movable section; 15. Hydraulic cylinder 3; 16. Piston rod 3; 17. Elastic member 2; 18. Diagonal brace 1; 19. Piston rod 4; 20. Transmission screw rod 2; 21. Cable reel; 211. Circular side plate; 212. Cylindrical tube; 22. Pipe section; 221. Communication hole; 23. Rod section; 24. Fixed plate; 241. Vertical plate section; 242. Horizontal plate section; 25. Movable plate; 26. Hydraulic cylinder 1; 27. Trigger rod; 28. Hydraulic cylinder 2; 29. Hydraulic cylinder 4; 30. Connecting pipe; 31. Trigger block; 32. Plug; 33. Elastic member 3; 34. Elastic member 1; 35. Piston rod 1; 36. Horizontal mounting plate; 37. Diagonal brace 2; 38. Transmission screw rod 1; 39. Driving slide block; 40. Limit block; 41. Pressing plate 2. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0043] The following is one of the embodiments of a lifting tool for lifting a large cable reel provided by the present invention:

[0044] As Figures 1 - 12As shown, a lifting tool for a large cable reel includes a lifting frame, a boom mechanism, a telescopic support rod, a hydraulic oil supply component, a locking structure, and a driving mechanism. This lifting tool for a large cable reel is used for lifting a cable reel 21 as shown in Figure 11 , Figure 12 . The cable reel 21 includes a cylinder 212 and circular side plates 211 connected to both ends of the cylinder 212.

[0045] As shown in Figures 1 - 4 , the lifting frame includes a main support and two longitudinal guide rails 5.

[0046] The main support includes a cross beam 2 extending left and right and two baffle plates 1 respectively connected to the left and right ends of the cross beam 2. As shown in Figure 10 , the cross section of the cross beam 2 is in a shape of a capital "J". There are upwardly protruding ridges 201 at the front and rear ends of the cross beam 2. Three lifting rings 3 for connecting to a suspension mechanism are connected to the top of the cross beam 2 and are distributed at intervals left and right. As shown in Figure 6 , a horizontal mounting plate 36 is also connected to the middle position at the bottom of the cross beam 2, and a vertical mounting plate 7 is vertically connected to the bottom of the horizontal mounting plate 36.

[0047] As shown in Figures 2 - 4 , both of the two longitudinal guide rails 5 extend in the front - rear direction. Two symmetrically arranged front - rear sliders 8 are connected to the top of the longitudinal guide rail 5. The slider 8 is provided with a downward - opening U - shaped notch. The two sliders 8 are respectively buckled on the two ridges 201 on the cross beam 2 through the U - shaped notches, so that the two longitudinal guide rails 5 are connected to the cross beam 2 in a left - right guiding and sliding manner. As shown in Figure 6 , a driving slider 39 is also connected to the top of the longitudinal guide rail 5. The driving slider 39 is located between the two sliders 8 and is inserted into the inner cavity of the cross beam 2 from bottom to top.

[0048] As shown in Figures 1 - 4 , the boom mechanism includes two groups of boom combinations arranged symmetrically front - rear. Each boom combination includes two groups of boom assemblies arranged symmetrically left - right and sliding front - rear on the two longitudinal guide rails 5 respectively.

[0049] Each boom assembly includes a boom, a support leg, a hydraulic cylinder one 26, a hydraulic cylinder two 28, a hydraulic cylinder three 15, a diagonal brace one 18, a diagonal brace two 37, and a pressing member.

[0050] As shown in Figure 1 , Figure 2 , Figure 4 , the boom is a vertically extending lifting cylinder. The lifting output end 12 of the lifting cylinder is arranged downward. The top of the cylinder body 11 of the lifting cylinder is connected with a slider two 10, and the slider two 10 is slidably mounted front - rear on the corresponding longitudinal guide rail 5.

[0051] As shown in Figure 4As shown, a left - and - right extending connecting rod 9 is passed through two symmetrically arranged slider pairs 10. The connecting rod 9 is longer than the cross - beam 2 mentioned above.

[0052] As Figure 4 、 Figure 5 shown, the support leg includes a main body section 13 and a movable section 14. The main body section 13 is connected to the lifting output end 12 of the lifting cylinder and is located on one side of the lifting cylinder facing the central area of the boom assembly. A T - shaped sliding groove penetrating left - and - right is provided on the main body section 13. A slope 131 inclined downward from top to bottom towards the center of the boom assembly is also provided on the main body section 13.

[0053] The movable section 14 is located on the side of the main body section 13 facing away from the lifting cylinder. One end of the movable section 14 facing the lifting cylinder is connected with a left - and - right extending T - shaped sliding rail. The T - shaped sliding rail is inserted into the T - shaped sliding groove so that the movable section 14 is slidably connected to the main body section 13 in the left - and - right direction. A cylindrical sealing chamber with an axis extending vertically is provided inside the movable section 14 (not shown in the figure). A piston rod four 19 extending vertically is passed through the sealing chamber.

[0054] As Figure 6 、 Figure 9 shown, a hydraulic cylinder one 26 is fixedly installed on the side wall of the cylinder block 11 of the lifting cylinder. A piston rod one 35 extending vertically is passed through the hydraulic cylinder one 26. The top end of the piston rod one 35 is located above the hydraulic cylinder one 26 and is vertically connected with a pressing plate one. An elastic member one 34 is sleeved outside the piston rod one 35. The elastic member one 34 is a compression spring capable of elastic expansion and contraction up and down. The elastic member one 34 is located between the pressing plate one and the hydraulic cylinder one 26.

[0055] A trigger rod 27 extending up and down is coaxially passed through the inside of the piston rod one 35. The trigger rod 27 can slide relatively up and down with respect to the piston rod one 35. A limiting block 40 is vertically connected to the top end of the trigger rod 27. The bottom end of the trigger rod 27 extends below the hydraulic cylinder one 26 and is fixedly connected to the main body section 13 mentioned above. When the lifting output end 12 of the lifting cylinder moves downward, it can drive the trigger rod 27 to move downward, and drive the piston rod one 35 to move downward through the limiting block 40 at the top end of the trigger rod 27.

[0056] As Figure 6 、 Figure 7As shown in the figure, the second hydraulic cylinder 28 is fixedly installed on the above-mentioned main body section 13. A piston rod two extending left and right is slidably inserted into the second hydraulic cylinder 28 in the left-right direction, and the above-mentioned movable section 14 is connected to the end of the piston rod two. The inner cavity of the second hydraulic cylinder 28 is communicated with the inner cavity of the first hydraulic cylinder 26 through a hose. When the lifting output end 12 of the above-mentioned lifting cylinder moves downward, it drives the trigger rod 27 to move downward, thereby driving the piston rod one 35 to move downward, so as to squeeze the hydraulic oil in the first hydraulic cylinder 26 into the inner cavity of the second hydraulic cylinder 28, thereby pushing the piston rod two to extend outwards, driving the movable section 14 to move away from the main body section 13.

[0057] As Figure 4 , Figure 5 shown in the figure, the third hydraulic cylinder 15 is perpendicularly connected to the main body section 13 with respect to the above-mentioned slope 131. A piston rod three extending in a direction inclined from bottom to top towards the center of the boom assembly is slidably inserted into the third hydraulic cylinder 15. The top end of the piston rod three extends above the third hydraulic cylinder 15 and is vertically connected with a second pressing plate 41. An elastic member two 17 is sleeved outside the piston rod three. The elastic member two 17 is a compression spring that can expand and contract along the extending direction of the piston rod three. The elastic member two 17 is located between the second pressing plate 41 and the third hydraulic cylinder 15.

[0058] The first bracing member 18 is rotatably installed on the second pressing plate 41 at the top end of the piston rod three around a rotation axis extending front and back. The second bracing member 37 is rotatably installed on the top end of the piston rod four 19 around a rotation axis extending front and back. The second bracing member 37 is lower than the first bracing member 18. When the elastic member two 17 is in a natural state, the piston rod three 16 extends outwards to a state where the first bracing member 18 protrudes towards the center of the boom assembly beyond the second bracing member 37.

[0059] The inner cavity of the above-mentioned third hydraulic cylinder 15 is communicated with the inner cavity of the sealed chamber through a hose. During the process that the two sets of boom assemblies symmetrical left and right approach each other and the two first bracing members 18 are elastically pressed against the circular side plate 211 of the cable reel 21, the piston rod three 16 is retracted into the third hydraulic cylinder 15, squeezing the hydraulic oil in the third hydraulic cylinder 15 into the sealed chamber, thereby driving the piston rod four 19 to move upwards, so that the second bracing member 37 supports on the circular side plate 211 of the cable reel 21.

[0060] As Figure 6 , Figure 7 shown in the figure, the extruding member includes a fixed plate 24 and a movable plate 25. The fixed plate 24 is L-shaped, including a vertical plate section 241 and a horizontal plate section 242 that are vertically connected. The horizontal plate section 242 is located on the side of the vertical plate section 241 facing the center of the boom assembly. The vertical plate section 241 is slidably installed on the cylinder body 11 of the lifting cylinder in the up-down guiding manner, and the horizontal plate section 242 is fixedly connected to the above-mentioned main body section 13.

[0061] The movable plate 25 is coplanar with the fixed plate 24 and fixedly connected to the movable section 14. When the lifting output end 12 of the lifting cylinder moves downward, the pressing member is driven to move downward synchronously through the supporting feet.

[0062] There are two telescopic support rods, both of which extend in the front-rear direction, and a telescopic support rod is connected between every two relatively front-rear movable plates 25.

[0063] As Figure 8 shown, the telescopic support rod includes a pipe section 22 and a rod section 23 that slides back and forth and is inserted into the pipe section 22. The rod section 23 and the pipe section 22 are respectively connected to two relatively front-rear movable plates 25. A communication hole 221 is provided on the side wall of one end of the pipe section 22 close to the movable plate 25 to which it is connected.

[0064] There are two sets of hydraulic oil supply components, which are respectively used to supply hydraulic oil to the two telescopic support rods.

[0065] As Figure 7 shown, the hydraulic oil supply component includes a fourth hydraulic cylinder 29 and a connecting pipe 30. The fourth hydraulic cylinder 29 is installed on the movable plate 25 to which the pipe section 22 of the corresponding telescopic support rod is connected. The connecting pipe 30 is connected between the oil outlet of the fourth hydraulic cylinder 29 and the communication hole 221 on the pipe section 22. When the pipe section 22 and the rod section 23 move away from each other, the hydraulic oil in the fourth hydraulic cylinder 29 is sucked into the inner cavity of the pipe section 22 through the connecting pipe 30.

[0066] There are two sets of locking structures, which are respectively used to lock the two telescopic support rods.

[0067] As Figure 8 shown, the locking structure includes a trigger block 31 and a plug 32. The trigger block 31 is slidably installed on the movable plate 25 connected to the pipe section 22 and is located on the side of the corresponding movable plate 25 facing away from the pipe section 22. An elastic member three 33 is connected between the trigger block 31 and the corresponding movable plate 25, and the elastic member three 33 is a compression spring that can elastically expand and contract back and forth. The plug 32 is fixedly connected to the trigger block 31 and is located on the side of the trigger block 31 facing the corresponding movable plate 25. The plug 32 slides back and forth through the corresponding movable plate 25 and passes through the movable plate 25 and is inserted into the inner cavity of the pipe section 22 from the end of the pipe section 22.

[0068] During the process of the two sets of front-rear opposite boom assemblies moving away from each other, the trigger block 31 presses against the circular side plate 211 in the cable reel 21, so that the trigger block 31 is pressed and moves towards the corresponding pipe section 22, driving the plug 32 to move towards the corresponding pipe section 22, blocking the communication hole 221 on the pipe section 22, and locking the hydraulic oil in the pipe section 22 in the inner cavity of the pipe section 22.

[0069] As Figures 1 - 4 andFigure 6 As shown, the driving mechanism includes a first driving component and a second driving component. The first driving component includes a first driving motor 4 and a first transmission screw 38. The first driving motor 4 is fixedly installed on one of the baffles 1 in the main bracket. The first transmission screw 38 extends in the left-right direction and is rotatably installed between the two baffles 1 in the main bracket. The first transmission screw 38 is located in the inner cavity of the cross beam 2. The first transmission screw 38 is in transmission connection with the first driving motor 4. The thread directions of the left and right half sections of the first transmission screw 38 are opposite. The two driving sliders 39 on the two longitudinal guide rails 5 are respectively threadedly sleeved on the left and right half sections of the first transmission screw 38.

[0070] The first driving motor 4 can drive the first transmission screw 38 to rotate. The first transmission screw 38 drives the two longitudinal guide rails 5 to approach or move away from each other synchronously, so as to drive the symmetrically arranged boom assemblies to approach or move away from each other synchronously.

[0071] The second driving component includes a second driving motor 6 and a second transmission screw 20. The second driving motor 6 is fixedly installed on the vertical mounting plate 7. The second transmission screw 20 extends in the front-rear direction. The second transmission screw 20 is rotatably penetrated through the vertical mounting plate 7 at fixed front and rear positions. The thread directions of the two half sections of the second transmission screw 20 on the front and rear sides of the vertical mounting plate 7 are opposite. The two connecting rods 9 are respectively helically sleeved on the front and rear half sections of the second transmission screw 20.

[0072] The second driving motor 6 can drive the second transmission screw 20 to rotate. The second transmission screw 20 drives the two connecting rods 9 to approach or move away from each other synchronously, so as to drive the two groups of boom combinations to approach or move away from each other synchronously.

[0073] When the present invention is in use, first adjust the size of the lifting appliance according to the size of the cable reel 21 to be suspended. Start the first driving motor 4 and the second driving motor 6 respectively, and adjust the distance between the two groups of boom combinations to: the interval between the two front-rear opposite pressing members is smaller than but close to the interval between the two circular side plates 211 in the cable reel 21, and the two front-rear opposite diagonal braces can respectively press on the two circular side plates 211 in the cable reel 21. The interval between the feet in the two symmetrically arranged boom assemblies is larger than the outer diameter of the cable reel 21. Then adjust the lifting cylinder so that the lifting output end 12 of the lifting cylinder extends until the total length of the lifting cylinder is greater than the outer diameter of the cable reel 21. During the adjustment of the lifting cylinder, the trigger rod 27 drives the piston rod 35 to move downward, squeezing the hydraulic oil in the first hydraulic cylinder 26 into the second hydraulic cylinder 28, driving the piston rod 2 to extend outwards, so that the movable section 14 moves away from the main body section 13, and the position of the movable section 14 matches the size of the cable reel 21.

[0074] After that, the spreader is lowered through the suspension structure, so that the spreader covers the outside of the cable reel 21 from top to bottom. Then, the driving motor 1 4 is started, so that the symmetrically arranged boom assemblies approach each other, and the symmetrically arranged first struts 18 approach each other, and finally press against the circumferential outer wall of the circular side plate 211 in the cable reel 21 to support the cable reel 21. While the first struts 18 are elastically compressed, the piston rod 3 16 is driven to retract into the hydraulic cylinder 3 15, and the hydraulic oil in the hydraulic cylinder 3 15 is squeezed into the closed chamber to jack up the piston rod 4 19, driving the second struts 37 to press against the circumferential outer wall of the circular side plate 211 in the cable reel 21 to support the cable reel 21.

[0075] Then, the driving motor 2 6 is started again to drive the two boom combinations to move away from each other, and the front and rear opposing pressing members move away from each other, so as to press against the two circular side plates 211 of the cable reel 21, and the cable reel 21 is tightened, realizing the relative fixation between the cable reel 21 and the boom mechanism.

[0076] During the process of the front and rear opposing pressing members moving away from each other, the telescopic support rod is pulled and elongated, the pipe section 22 and the rod section 23 move away from each other, and the hydraulic oil in the hydraulic cylinder 4 29 is sucked into the inner cavity of the pipe section 22. During the process of the pressing member pressing against the circular side plate 211, the trigger block 31 is squeezed and moved by the circular side plate 211, driving the plug 32 to block the communication hole 221 on the pipe section 22, so that the hydraulic oil remains in the inner cavity of the pipe section 22, enabling the telescopic support rod to stably support the boom combination.

[0077] The present invention can support the cable reel 21 more firmly, and can avoid shaking and collision between the cable reel 21 and the spreader during the process of transporting the cable reel 21, making the transportation process safer. Moreover, the present invention can hoist and transport various cable reels 21 with different sizes, and has a wider range of applications.

Claims

1. A lifting device for lifting a large cable drum, comprising a hanger and a lifting arm mechanism installed on the hanger, characterized in that: The boom mechanism includes two groups of boom assemblies arranged symmetrically in front and back and capable of approaching or moving away from each other in the front and back direction, and the boom assembly includes two groups of boom components arranged symmetrically in left and right and capable of approaching or moving away from each other in the left and right direction; The boom assembly includes a boom and a support foot connected to the bottom end of the boom, the support foot is located on the side of the boom facing the center of the boom assembly, and a diagonal support member 1 and an extrusion member are provided on the support foot, and the diagonal support member 1 is elastically slidably mounted on the support foot along a direction inclined from bottom to top toward the center of the boom assembly; The diagonal support member 1 is used to elastically press against the circumferential side wall of the circular side plate in the cable drum to support the cable drum as the two groups of left-right symmetrical boom assemblies approach each other; The extrusion piece is used to stop the circular side plate in the cable drum front and back after the diagonal support piece lifts the cable drum. The two sets of suspension arm assemblies are used to move away from each other after the diagonal support piece lifts the cable drum, so as to drive the front and rear extrusion pieces relative to each other to move away from each other, so that the front and rear extrusion pieces relative to each other are pressed against the circular side plate from inside to outside to tighten the cable drum; The boom can be extended and retracted up and down, and the support leg includes a main body section and a movable section. The main body section is fixedly connected to the bottom end of the boom, and the movable section can be movably installed in the left and right directions on the end of the main body section facing away from the boom. A diagonal support member 1 is installed on the main body section, and a diagonal support member 2 is installed on the movable section. The diagonal support member 2 is located below the diagonal support member 1. The diagonal support member 2 is used to be pressed against the circumferential outer wall of the circular side plate of the cable drum as the two groups of boom assemblies that are symmetrical on the left and right approach each other.

2. A lifting device for lifting a large cable drum according to claim 1, characterized in that: The boom adopts a vertically extending lifting cylinder, the lifting output end of the lifting cylinder faces downward, and the main body section is connected to the lifting output end of the lifting cylinder.

3. A lifting device for lifting a large cable drum according to claim 2, characterized in that: The lifting cylinder is in transmission connection with the movable section, and the movable section can be driven to move back to the main section when the lifting output end of the lifting cylinder extends downward.

4. A lifting device for lifting a large cable drum according to claim 3, characterized in that: A hydraulic cylinder 1 is fixedly installed on the cylinder body of the lifting cylinder. A piston rod 1 is vertically inserted into the hydraulic cylinder 1. The piston rod 1 is connected to the main body section. A hydraulic cylinder 2 is fixedly installed on the main body section. A piston rod 2 is inserted into the hydraulic cylinder 2 along the left and right directions. The piston rod 2 is connected to the movable section. The inner cavities of the hydraulic cylinder 1 and the hydraulic cylinder 2 are connected. The downward movement of the driving output end of the lifting cylinder drives the piston rod 1 to move downward, thereby squeezing the hydraulic oil in the hydraulic cylinder 1 into the hydraulic cylinder 2 to drive the piston rod 2 to drive the movable section to move back to the main section.

5. A lifting device for lifting a large cable drum according to any one of claims 1 to 4, characterized in that: A hydraulic cylinder three is installed on the main section, and a piston rod three is elastically penetrated in the hydraulic cylinder three and inclined from bottom to top toward the center of the boom assembly, and a diagonal support piece one is connected to the top end of the piston rod three; a sealed chamber is provided on the movable section, and a piston rod four is vertically penetrated in the sealed chamber, and a diagonal support piece two is connected to the top end of the piston rod four. The inner cavity of the hydraulic cylinder three is connected to the sealed chamber, and the diagonal support piece one protrudes from the diagonal support piece two toward the center of the boom assembly when it does not contact the cable drum. In the process of the left-right symmetrical boom assemblies approaching each other, the diagonal support piece one is squeezed by the cable drum and drives the piston rod three to move downward, so as to squeeze the hydraulic oil in the hydraulic cylinder three into the sealed chamber, thereby driving the piston rod four to move upward so that the diagonal support piece two is supported on the circular side plate of the cable drum.

6. A lifting device for lifting a large cable drum according to any one of claims 1 to 4, characterized in that: The extrusion piece comprises a coplanar fixed plate and a movable plate, wherein the fixed plate is fixedly connected to the main body section, and the movable plate is fixedly connected to the movable section.

7. A lifting device for lifting a large cable drum according to any one of claims 1 to 4, characterized in that: A telescopic support rod extending forward and backward is connected between each front and rear opposing groups of extruded parts. The telescopic support rod includes a pipe section and a rod section movably inserted in the pipe section. A hydraulic oil supply assembly and a locking structure are connected to the movable section. The hydraulic oil supply assembly is used to inject hydraulic oil into the pipe section when the rod section and the pipe section move away from each other. The locking structure is used to lock the hydraulic oil in the inner cavity of the pipe section when the rod section and the pipe section are relatively stationary.

8. A lifting device for lifting a large cable drum according to claim 7, characterized in that: The telescopic support rod is connected between two movable plates which are opposite to each other at the front and the back.

9. A lifting device for lifting a large cable drum according to claim 8, characterized in that: The hydraulic oil supply assembly includes a hydraulic cylinder four, the inner cavity of which is connected to the inner cavity of the pipe section, and the hydraulic oil in the hydraulic cylinder four is sucked into the inner cavity of the pipe section during the process of the rod section and the pipe section moving away from each other; the locking structure includes a trigger block elastically slidably mounted on the movable plate for front and rear sliding, and a plug connected to the trigger block, the trigger block is located at one end of the movable plate facing away from the telescopic support rod, the plug passes through the movable plate in the front and rear direction and is inserted into the inner cavity of the pipe section, the trigger block is used to be squeezed by the circular side plate of the cable drum and move toward the pipe section during the process of tightening the cable drum, so as to drive the plug to move in the pipe section to seal the connecting area between the pipe section and the hydraulic cylinder four.

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