Automatic lifting device for crane arm

Abstract

The present invention relates to the field of crane technology, and specifically to an automatic lifting device for a crane boom, comprising a center frame, a locking unit, and an adjustment mechanism. The present invention firstly implements uniformly distributed multi-point locking and clamping on the boom through the locking units on the active frame and the two secondary frames, so that the boom is stably and evenly stressed by the multi-point clamping, thereby avoiding relative movement of the boom. Secondly, the tilt angle of the boom is controlled by adjusting the height difference between the two secondary frames, thereby improving the convenience of the lifting process, reducing the lifting time and cost. At the same time, the tilt angle of the boom is locked by inserting a positioning rod into a waist-shaped groove, thereby maintaining the tilt angle of the boom during the subsequent movement of the boom. At the same time, a stable triangular structure is formed on both sides of the center frame to further improve the stability of the boom during the lifting process.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to an automatic lifting device for a crane boom. Background Art

[0002] A crane is a mechanical device used to lift, lower or horizontally move heavy objects. It is widely used in construction sites, ports, warehouses and other operating scenarios. A crane is mainly composed of a base, a boom, a hydraulic system, a rotation system and a travel system. The boom is an important part of the crane, which is responsible for carrying and moving heavy objects. The installation quality of the boom directly affects the working efficiency and safety of the crane.

[0003] Currently, in the process of lifting and installing the boom, the boom is mainly lifted by external lifting equipment, and then the boom is adjusted to the required angle position to facilitate the alignment of the boom with the base to ensure that the final assembly result meets the expected performance indicators. Subsequently, one end of the boom is aligned and connected with the connection point on the base, and finally connected and installed through bolts, pins and other components.

[0004] However, the above-mentioned current lifting process has the following problems: after the boom is lifted, in the process of adjusting the boom to a specific angle position, another external lifting device is often used for auxiliary lifting and positioning, that is, the boom is tilted by the cooperation of two external lifting devices, and the tilt angle is manually measured using measuring tools in the process. When the tilt angle is a specific angle, the angle adjustment of the boom is completed, and then the two external lifting devices cooperate with each other to move the boom and align it with the base, and after alignment, the boom and the base are installed and fixed, but the angle of the boom is first adjusted and then moved by a crane at this angle. During the movement, the tilted boom is not limited or other operations are performed. The boom lifting and movement stability is low, and the boom is prone to changes in tilt angle, which will not only affect the lifting efficiency and installation efficiency, but also increase the docking error between the boom and the base. Summary of the invention

[0005] Based on this, it is necessary to provide an automatic lifting device for a crane boom, aiming to solve the problems of the above-mentioned prior art.

[0006] The present application provides a crane boom automatic lifting device, comprising:

[0007] A center frame, wherein the center frame is fixedly arranged at the lower end of the main rope one, a line gathering assembly is arranged in the center frame, a lifting block is fixedly arranged at the lower end of the center frame through the main rope two, an active frame is fixedly arranged on the lower end face of the lifting block, two front-to-back symmetrical auxiliary ropes are arranged on the center frame, two left-to-right distributed secondary moving frames are commonly arranged on the two auxiliary ropes, and both the active frame and the secondary moving frame are U-shaped and their openings are both facing downwards.

[0008] A locking unit is provided on the active frame and the two secondary frames for locking the arm frame. The locking unit comprises a locking plate. Two locking plates distributed front and back are provided in the U-shaped area of ​​the active frame and the secondary frames.

[0009] An adjustment mechanism is provided on the lifting block and the two auxiliary ropes for adjusting the inclination angles of the two secondary movable frames. The adjustment mechanism includes a fixed frame. The two auxiliary ropes are provided with two fixed frames respectively distributed on the left and right sides of the center frame. Swinging plates are installed symmetrically on the front and rear ends of the lifting block through the rotation axis. A driving unit for driving the two fixed frames to adjust their positions is provided on the two swinging plates.

[0010] According to a favorable embodiment, the locking unit also includes a fixed rod, and the front end surfaces of the rear vertical sections of the active frame and the secondary movable frame are fixedly installed with a fixed rod with an axis extending from front to rear, and the front vertical sections of the active frame and the secondary movable frame slide forward and backward and are penetrated by a moving rod with an axis extending from front to rear, and two front and rear corresponding locking plates are respectively rotatably arranged on the front side of the fixed rod and the rear side of the moving rod, and the front end surface of the rear locking plate is fixedly provided with two threaded rods distributed up and down and with an axis extending from front to rear, the threaded rods penetrate the corresponding locking plate on the front side, and nuts are threadedly installed on the threaded rods.

[0011] According to a favorable embodiment, the locking unit also includes a support plate, the front end face of the locking plate on the rear side is fixedly provided with a support plate, and the support plate is located between the corresponding upper and lower threaded rods, the front end face of the support plate is provided with a plug-in groove, and the rear end face of the locking plate on the front side is fixedly provided with a plug-in column that plugs into the plug-in groove.

[0012] According to an advantageous embodiment, the locking unit further comprises a fixing bar, which is movably mounted on the moving rod corresponding to the active frame, and the left and right ends of the fixing bar are penetrated by a docking groove for docking with the moving rod on the secondary moving frame.

[0013] According to a favorable embodiment, a guide groove connected to the docking groove is formed on the rear end face of the fixing strip, the front inner wall of the guide groove is inclined backwards near one end of the active frame, the cross section of the guide groove in a top view is a right triangle, and the front end of the moving rod on the secondary active frame is chamfered.

[0014] According to a favorable embodiment, the driving unit includes a waist-shaped groove, and the swing plate is provided with two waist-shaped grooves distributed on the left and right. A driving rod with an axis extending from front to rear is fixedly arranged on the end surface of the fixed frame facing the lifting block through two front-to-back symmetrical connecting strips. The driving rod is slidably connected between the front and rear waist-shaped grooves adjacent to it. A driving block located on the right side of the lifting block is fixedly arranged at the lower ends of the two swing plates. A hydraulic cylinder is hingedly arranged on the active frame, and the telescopic end of the hydraulic cylinder is hingedly connected to the driving block.

[0015] According to a favorable embodiment, the adjustment mechanism also includes a locking piece, the front and rear lateral sections of the fixed frame are movable forward and backward and are penetrated by movable columns, the opposite surfaces of the front and rear movable columns are fixedly provided with locking pieces fixedly connected to the corresponding auxiliary ropes, a telescopic rod is fixedly provided between the front and rear locking pieces, the left and right end surfaces of the central frame are fixedly provided with horizontal plates located above the wire collection assembly, sliding blocks are provided on the horizontal plates for sliding left and right, and the upper end surfaces of the two longitudinal sections on the fixed frame are fixedly provided with limiting rods with vertical axes that slide through the corresponding sliding blocks.

[0016] According to a favorable embodiment, a U-shaped plate with an upward opening is slidably arranged on the movable rod corresponding to the active frame, the U-shaped plate is rotatably connected to the front end of the fixed bar, and the rear end surfaces of the two vertical sections of the U-shaped plate are fixedly provided with positioning rods, which are plug-fitted into the corresponding waist-shaped grooves.

[0017] According to a preferred embodiment, the cable collection assembly includes a fixed column, a fixed column with an axis extending from front to rear is fixedly provided on the central frame, a separating ring is fixedly provided on the fixed column, an auxiliary rope is passed around the upper end of the fixed column, and two auxiliary ropes are respectively located on the front and rear sides of the separating ring.

[0018] According to a favorable embodiment, a pull wire group is provided on the secondary moving frame, and the pull wire group includes a connecting block. Two front-to-rear symmetrical connecting blocks are provided on the upper end surface of the secondary moving frame for sliding back and forth. The two ends of the auxiliary rope are respectively fixedly connected to two connecting blocks on the two secondary moving frames and opposite to each other on the left and right. A bidirectional threaded rod with an axis extending from front to rear is provided on the upper end surface of the secondary moving frame through rotation of the fixed block. The bidirectional threaded rod passes through the corresponding two connecting blocks and is threadedly matched with the two connecting blocks.

[0019] In summary, the present invention includes at least one of the following beneficial effects:

[0020] 1. The present invention firstly implements uniformly distributed multi-point locking and clamping on the boom through the locking units on the active frame and the two secondary frames. The multi-point clamping makes the force on the boom stable and uniform, thereby avoiding relative movement of the boom. Secondly, the inclination angle of the boom is controlled by adjusting the height difference between the two secondary frames, thereby improving the convenience of the lifting process, reducing the lifting time and cost. At the same time, the inclination angle of the boom is locked by inserting the positioning rod into the waist-shaped groove, thereby maintaining the inclination angle of the boom during the subsequent movement of the boom. At the same time, the stable triangular structure formed on both sides of the center frame is used to further improve the stability of the boom during the lifting process.

[0021] 2. The present invention firstly locks the boom using the locking unit on the active frame, and then inserts the moving rod on the secondary moving frame into the corresponding docking groove, so that the two auxiliary ropes are in a taut state, ensuring the accuracy of the subsequent angle adjustment process. At the same time, the two locking plates on the secondary moving frame lock the boom, completing the three-point clamping and locking of the boom, which is beneficial to improving the stability of the boom in the subsequent lifting process.

[0022] 3. The present invention inserts the positioning rod into the waist-shaped groove on the swing plate to complete the locking and fixation of the swing plate and the locking of the tilt angle of the arm, thereby preventing the arm from changing its tilt angle during subsequent movement and affecting the lifting and installation operations. Secondly, a stable frame is formed as a whole to ensure the stability of the tilted arm during the lifting process.

[0023] 4. In the present invention, when the two connecting blocks on the same primary movable frame move away from each other, the angle between the two auxiliary ropes at the center frame increases. After being inserted into the waist-shaped groove for clamping through the positioning rod, the two auxiliary ropes form a stable triangular structure on both sides of the center frame, thereby improving the stability of the boom during the lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown.

[0026] Figure 2 A partial three-dimensional structural schematic diagram of the present invention is shown.

[0027] Figure 3 Shows Figure 2 Top view of the floor plan.

[0028] Figure 4 A partial cross-sectional view of the active frame, the locking plate and the support plate of the present invention is shown.

[0029] Figure 5 A three-dimensional structural schematic diagram of the central frame, the sliding block and the fixing bar of the present invention is shown.

[0030] Figure 6 A partial cross-sectional view of the active frame, the secondary active frame and the fixing bar of the present invention is shown.

[0031] Figure 7 Shows Figure 6 Enlarged view of point A in the middle.

[0032] Figure 8 The schematic diagram shows the process of sleeve installation of the active frame and the secondary active frame on the boom in the present invention.

[0033] The above drawings include the following reference numerals:

[0034] 1. Main rope 1; 2. Center frame; 20. Cable assembly; 200. Fixed column; 201. Separation ring; 21. Lifting block; 22. Active frame; 23. Auxiliary rope; 24. Secondary active frame; 3. Locking unit; 30. Locking plate; 31. Fixed rod; 310. Moving rod; 311. Threaded rod; 312. Nut; 32. Support plate; 320. Plug column; 33. Fixed strip; 330. Docking groove; 3 31. Guide groove; 4. Adjustment mechanism; 40. Fixed frame; 41. Swinging plate; 42. Drive unit; 420. Waist-shaped groove; 421. Drive rod; 422. Hydraulic cylinder; 43. Locking piece; 430. Telescopic rod; 431. Horizontal plate; 432. Sliding block; 433. Limiting rod; 44. U-shaped plate; 440. Positioning rod; 45. Pull wire group; 450. Connecting block; 451. Bidirectional threaded rod. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0036] like Figure 1 and Figure 2 As shown, a crane boom automatic lifting device comprises:

[0037] A center frame 2, wherein the center frame 2 is fixedly arranged at the lower end of a main rope 1, and the main rope 1 is connected to an external lifting device (not shown in the figure). A line gathering assembly 20 is arranged in the center frame 2, and a lifting block 21 is fixedly arranged at the lower end of the center frame 2 through the main rope 2, and an active frame 22 is fixedly arranged on the lower end surface of the lifting block 21. Two front-to-back symmetrical auxiliary ropes 23 are arranged on the center frame 2, and two left-to-right distributed secondary moving frames 24 are commonly arranged on the two auxiliary ropes 23, and both the active frame 22 and the secondary moving frame 24 are U-shaped and their openings are both facing downward.

[0038] like Figure 1 and Figure 2 As shown, the active frame 22 and the two secondary frames 24 are jointly provided with a locking unit 3 for locking the arm frame, and the locking unit 3 includes a locking plate 30. Two locking plates 30 distributed front and back are provided in the U-shaped area of ​​the active frame 22 and the secondary frames 24.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 8 As shown, the lifting block 21 and the two auxiliary ropes 23 are provided with an adjustment mechanism 4 for adjusting the tilt angle of the two secondary movable frames 24, and the adjustment mechanism 4 includes a fixed frame 40. The two auxiliary ropes 23 are provided with two fixed frames 40 respectively distributed on the left and right sides of the center frame 2. The front and rear ends of the lifting block 21 are symmetrically mounted with swing plates 41 through a rotation axis, and the two swing plates 41 are provided with a driving unit 42 for driving the two fixed frames 40 to adjust their positions.

[0040] During operation, the active frame 22 and the two secondary moving frames 24 are moved and placed on the boom through the external lifting equipment, and the boom is located between the corresponding two locking plates 30 on the active frame 22 and the secondary moving frame 24, and then the locking unit 3 operates to make the corresponding two locking plates 30 lock each other and clamp the boom, so that the active frame 22 and the two secondary moving frames 24 are all locked in the specified positions on the boom, and at the same time, the external lifting equipment works to lift the boom through the main rope 1, the main rope 2 and the auxiliary rope 23, and the driving unit 42 in the adjustment mechanism 4 works to make the swing plate 41 rotate a specified angle, and then the two fixed frames 40 are moved, that is, the active frame 22 and the secondary moving frame 24 drive the boom to adjust to the inclination angle required for installation through the above method, so as to meet the requirements of subsequent installation and docking of the boom with the crane base.

[0041] like Figure 1 , Figure 2 and Figure 4 As shown, the locking unit 3 also includes a fixed rod 31, and the front end surfaces of the rear vertical sections of the active frame 22 and the secondary movable frame 24 are fixedly installed with a fixed rod 31 with an axis extending from front to rear. The front vertical sections of the active frame 22 and the secondary movable frame 24 slide forward and backward and are penetrated by a moving rod 310 with an axis extending from front to rear. The two corresponding front and rear locking plates 30 are respectively rotatably arranged on the front side of the fixed rod 31 and the rear side of the moving rod 310. The front end surface of the rear locking plate 30 is fixedly provided with two threaded rods 311 distributed up and down and with an axis extending from front to rear. The threaded rod 311 penetrates the corresponding front locking plate 30, and a nut 312 is threadedly installed on the threaded rod 311.

[0042] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 8As shown, the locking unit 3 also includes a support plate 32, and the front end face of the rear locking plate 30 is fixedly provided with the support plate 32, and the support plate 32 is located between the corresponding upper and lower threaded rods 311 and close to the lower threaded rod 311, and the front end face of the support plate 32 is provided with a plug-in groove, and the rear end face of the front locking plate 30 is fixedly provided with a plug-in column 320 that is plugged into the plug-in groove.

[0043] The process of clamping and locking the boom by the two locking plates 30 on the active frame 22 is taken as an example to illustrate. Specifically: initially, the boom is supported by the two existing support members, wherein the left support member implements bottom support for the left end of the boom, and the right support member is movable and first implements bottom support for the position of the middle part of the boom that is biased to the left, and the active frame 22 and the secondary moving frame 24 are driven downward by an external lifting device, and the active frame 22 and the secondary moving frame 24 are manually assisted to be sleeved on the boom from the right end of the boom, and after the right secondary moving frame 24 is away from the right end of the boom, the right support member moves to the bottom of the right end of the boom and implements bottom support for the right end of the boom, and the active frame 22 and the secondary moving frame 24 are located between the two support members (see Figure 8 ). At this time, the boom is located between the corresponding two locking plates 30 and the support plate 32 is located below the boom. Then, the front locking plate 30 is moved backward so that the threaded rod 311 on the rear locking plate 30 passes through the front locking plate 30. At the same time, the plug-in column 320 on the front locking plate 30 is moved backward and inserted into the plug-in slot, so that the front locking plate 30 is finally close to the boom. Then, an external tool such as a wrench is used to manually install and tighten the nut 312 so that the front locking plate 30 and the rear locking plate 30 are locked on the boom. At this point, the clamping and locking operation of the boom by the two locking plates 30 on the active frame 22 is completed. In the subsequent lifting process, the support plate 32 and the plug-in column 320 cooperate with each other to support the boom.

[0044] After the lifting operation is completed and one end of the boom is installed on the base, the nut 312 is loosened to release the locking state of the two locking plates 30 on the boom, and then the active frame 22 and the secondary active frame 24 are removed from the other end of the boom. The above method is used to complete the process of rapid disassembly and assembly, clamping and lifting the boom, etc., thereby improving the convenience of the device lifting process. It should be noted that when one end of the boom is connected and installed with the base, the side of the boom is also connected to the hydraulic system and other structures on the base, so the lifting device can be completely evacuated from the boom, and after evacuation, the boom can remain in a stable state.

[0045] like Figure 1 , Figure 2 and Figure 5As shown, the locking unit 3 also includes a fixing bar 33, and the fixing bar 33 is movably installed on the moving rod 310 corresponding to the active frame 22. The fixing bar 33 moves forward and backward along the moving rod 310 and can rotate. The fixing bar 33 is driven by an external hydraulic cylinder 1 (not shown in the figure) to move forward and backward. Both left and right ends of the fixing bar 33 are penetrated by docking grooves 330 for docking with the moving rod 310 on the secondary moving frame 24.

[0046] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the rear end face of the fixing strip 33 is provided with a guide groove 331 connected to the docking groove 330, the front inner wall of the guide groove 331 is inclined backwards near one end of the active frame 22, the cross section of the guide groove 331 in a top view is a right triangle, and the front end of the moving rod 310 on the secondary active frame 24 is chamfered.

[0047] During operation, the active frame 22 and the secondary moving frame 24 are driven downward by the external lifting equipment, and the active frame 22 and the secondary moving frame 24 are manually assisted to be sleeved on the arm from the right end of the arm. After the right secondary moving frame 24 is away from the right end of the arm, the right support member moves to the bottom of the right end of the arm and implements bottom support on the right end of the arm, and then locks and clamps the arm. Specifically, the active frame 22 is first located in the middle position of the arm, and then the two locking plates 30 on the active frame 22 are locked, and then the fixing bars 33 are rotated and the positions of the two secondary moving frames 24 are adjusted, so that the moving rod 310 on the secondary moving frame 24 is initially opposite to the position of the corresponding guide groove 331, and then the external lifting equipment works to lift the arm so that the arm is suspended. At this time, the locking plate 30 on the secondary moving frame 24 is not aligned with the arm The frame is locked, but the corresponding support plate 32 supports the lower end of the boom, and then the external hydraulic cylinder works to drive the fixed bar 33 to move backward. The inclined surface of the guide groove 331 on the fixed bar 33 is opposite to the corresponding moving rod 310. As the fixed bar 33 continues to move backward, the moving rod 310 moves into the docking groove 330 along the inclined surface of the corresponding guide groove 331, and finally the moving rod 310 on the secondary moving frame 24 is stuck in the corresponding docking groove 330, that is, the three moving rods 310 are arranged equidistantly along the length direction of the fixed bar 33, and the two auxiliary ropes 23 are in a taut state. Then, the nut 312 on the secondary moving frame 24 is manually tightened, so that the corresponding two locking plates 30 on the secondary moving frame 24 lock the boom, completing the three-point clamping and locking of the boom, thereby improving the stability of the boom during subsequent lifting and moving processes.

[0048] like Figure 1 and Figure 5As shown, the driving unit 42 includes a waist-shaped groove 420, and two waist-shaped grooves 420 distributed on the left and right are opened on the swing plate 41. A driving rod 421 with an axis extending from front to rear is fixedly provided on the end face of the fixed frame 40 facing the lifting block 21 through two front and rear symmetrical connecting strips. The driving rod 421 is slidably connected between the front and rear two adjacent waist-shaped grooves 420. The lower ends of the two swing plates 41 are jointly fixed with a driving block located on the right side of the lifting block 21. A hydraulic cylinder 422 is hingedly provided on the active frame 22, and the telescopic end of the hydraulic cylinder 422 is hinged to the driving block.

[0049] like Figure 1 , Figure 2 and Figure 5 As shown, the adjustment mechanism 4 also includes a locking piece 43, the front and rear lateral sections of the fixed frame 40 are both movable and penetrated by movable columns, the opposite surfaces of the front and rear movable columns are fixedly provided with locking pieces 43 fixedly connected to the corresponding auxiliary ropes 23, a telescopic rod 430 is fixedly provided between the front and rear locking pieces 43, the left and right end surfaces of the center frame 2 are both fixedly provided with horizontal plates 431 located above the wire collection assembly 20, a sliding block 432 is slidingly provided on the horizontal plate 431, and the upper end surfaces of the two longitudinal sections of the fixed frame 40 are both fixedly provided with limiting rods 433 with vertical axes that slide through the corresponding sliding blocks 432.

[0050] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a U-shaped plate 44 with an opening facing upward is slidably arranged on the movable rod 310 corresponding to the active frame 22, and the U-shaped plate 44 is rotatably connected to the front end of the fixed bar 33. The rear end surfaces of the two vertical sections of the U-shaped plate 44 are fixedly provided with positioning rods 440, and the positioning rods 440 are plug-fitted with the corresponding waist-shaped grooves 420.

[0051] During operation, after the locking plates 30 on the active frame 22 and the secondary movable frame 24 are moved to the specified positions and the locking clamping is completed, the external lifting equipment continues to lift the boom up to provide sufficient adjustment space for subsequent adjustment operations. Then the hydraulic cylinder 422 works so that its telescopic end drives the driving block to rise, and the driving block drives the two swing plates 41 to rotate, that is, the left half of the swing plate 41 drives the left fixed frame 40 to move down through the cooperation between the upper waist groove 420 and the driving rod 421, and the right half of the swing plate 41 drives the right fixed frame 40 Move upward, the fixed frame 40 drives the auxiliary rope 23 to move synchronously through the locking piece 43 thereon, and the secondary moving frames 24 on the left and right sides move in the vertical direction under the pulling of the secondary rope 23, so that the required height difference is generated between the left and right secondary moving frames 24, and the height difference between the two secondary moving frames 24 is controlled by adjusting the swing angle of the swing plate 41. In this process, the boom swings around the axis of the moving rod 310 on the active frame 22, and finally the boom tilts to a specified angle, and the tilt angle is the installation angle required during the lifting process.

[0052] In the process of the two fixed frames 40 driving the corresponding locking members 43 to move, the locking members 43 adaptively move in the front-to-back direction. Secondly, through the cooperation between the limiting rod 433 and the sliding block 432, the two fixed frames 40 maintain horizontal movement in the left-right direction, ensuring that the auxiliary rope 23 is always in a taut state.

[0053] After the swing plate 41 completes its rotation, the external hydraulic cylinder continues to operate to drive the fixed bar 33 and the U-shaped plate 44 to move backward synchronously, and the positioning rod 440 on the U-shaped plate 44 is inserted into the waist-shaped groove 420 at the corresponding position on the swing plate 41, thereby completing the locking and fixation of the swing plate 41. At this time, the swing plate 41, the fixed frame 40, the horizontal plate 431, and the limiting rod 433 are all in a relatively fixed state, and then the active frame 22 and the two secondary active frames 24 are all in a relatively fixed state. Through the above operation, a stable lifting frame is formed as a whole to ensure the stability of the tilted arm during the subsequent lifting process.

[0054] like Figure 1 and Figure 2 As shown, the cable collection assembly 20 includes a fixed column 200, and a fixed column 200 with an axis extending from front to rear is fixedly provided on the central frame 2. A separator ring 201 is fixedly sleeved on the fixed column 200, and an auxiliary rope 23 is passed around the upper end of the fixed column 200, and two auxiliary ropes 23 are respectively located on the front and rear sides of the separator ring 201.

[0055] like Figure 1 , Figure 2 and Figure 3As shown, a pull wire group 45 is provided on the secondary moving frame 24, and the pull wire group 45 includes a connecting block 450. Two front-to-rear symmetrical connecting blocks 450 are slidably provided on the upper end surface of the secondary moving frame 24. The two ends of the auxiliary rope 23 are respectively fixedly connected to two connecting blocks 450 on the two secondary moving frames 24 and opposite to each other on the left and right. The upper end surface of the secondary moving frame 24 is rotatably provided with a bidirectional threaded rod 451 with an axis extending from front to back through the fixed block. The bidirectional threaded rod 451 passes through the corresponding two connecting blocks 450 and is threadedly matched with the two connecting blocks 450. The bidirectional threaded rod 451 is connected to an external high-torque motor (not shown in the figure). Two threaded sections with opposite thread directions are provided on the bidirectional threaded rod 451, and the connecting block 450 is threadedly connected to the corresponding threaded sections.

[0056] During operation, the two auxiliary ropes 23 are separated by the separating ring 201 in the line collection assembly 20. During the lifting process, the external high-torque motor drives the bidirectional threaded rod 451 to rotate synchronously, so that the two connecting blocks 450 on the same primary movable frame 24 move away from each other, and the connecting block 450 drives the ends of the auxiliary ropes 23 to move away synchronously. If the separating ring 201 is set as the base point, the angle between the two auxiliary ropes 23 at the base point increases, and after the swing plate 41 is locked by the cooperation of the positioning rod 440 and the waist-shaped groove 420, the fixed frame 40, the base point and the auxiliary rope 23 between the fixed frame 40 and the base point form a stable triangular structure. At the same time, the base point, the two fixed frames 40 and the swing plate 41 also form a stable triangular structure, thereby improving the stability of the boom during lifting.

[0057] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0058] In addition, the terms "first", "second", "number one", "number two" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "number one", "number two" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic lifting device for a crane boom, characterized in that: include: A center frame (2), wherein the center frame (2) is fixedly arranged at the lower end of the main rope (1), a line collection assembly (20) is arranged in the center frame (2), a lifting block (21) is fixedly arranged at the lower end of the center frame (2) through the main rope (2), an active frame (22) is fixedly arranged on the lower end surface of the lifting block (21), two auxiliary ropes (23) are arranged symmetrically in front and back on the center frame (2), two secondary moving frames (24) are jointly arranged on the two auxiliary ropes (23) and distributed in the left and right, and both the active frame (22) and the secondary moving frame (24) are U-shaped and their openings are both facing downwards; A locking unit (3), the active frame (22) and the two secondary frames (24) are provided with a locking unit (3) for locking the arm frame, the locking unit (3) comprising a locking plate (30), and two locking plates (30) are arranged in a front-to-rear distribution in a U-shaped region of each of the active frame (22) and the secondary frames (24); An adjustment mechanism (4), the hoisting block (21) and the two auxiliary ropes (23) are provided with an adjustment mechanism (4) for adjusting the tilt angle of the two secondary moving frames (24), the adjustment mechanism (4) comprising a fixed frame (40), the two auxiliary ropes (23) are provided with two fixed frames (40) respectively distributed on the left and right sides of the central frame (2), the front and rear ends of the hoisting block (21) are symmetrically rotatably mounted with swing plates (41) through a rotation axis, and the two swing plates (41) are provided with a driving unit (42) for driving the two fixed frames (40) to adjust their positions; The driving unit (42) comprises a waist-shaped groove (420), and two waist-shaped grooves (420) distributed on the left and right are provided on the swing plate (41). A driving rod (421) with an axis extending from front to rear is fixedly arranged on the end surface of the fixed frame (40) facing the lifting block (21) through two front-to-back symmetrical connecting strips, and the driving rod (421) is slidably connected between two front and rear waist-shaped grooves (420) adjacent thereto. A driving block located on the right side of the lifting block (21) is fixedly arranged at the lower ends of the two swing plates (41), and a hydraulic cylinder (422) is hingedly arranged on the active frame (22), and the telescopic end of the hydraulic cylinder (422) is hingedly connected to the driving block.

2. The automatic lifting device for a crane boom according to claim 1, characterized in that: The locking unit (3) further comprises a fixed rod (31), the front end surfaces of the rear side vertical sections of the active frame (22) and the secondary movable frame (24) are both slidable forward and backward and are penetrated by a fixed rod (31) with an axis extending from front to rear, the front side vertical sections of the active frame (22) and the secondary movable frame (24) are both slidable forward and backward and are penetrated by a moving rod (310) with an axis extending from front to rear, two front and rear corresponding locking plates (30) are respectively rotatably arranged on the front side of the fixed rod (31) and the rear side of the moving rod (310), two threaded rods (311) distributed up and down and with an axis extending from front to rear are fixedly arranged on the front end surface of the rear side locking plate (30), the threaded rod (311) penetrates the corresponding front side locking plate (30), and a nut (312) is threadedly installed on the threaded rod (311).

3. The automatic lifting device for a crane boom according to claim 2, characterized in that: The locking unit (3) further comprises a fixing bar (33), the fixing bar (33) being movably mounted on the moving rod (310) corresponding to the active frame (22), and a docking groove (330) for docking with the moving rod (310) on the secondary moving frame (24) being provided through both left and right ends of the fixing bar (33).

4. The automatic lifting device for a crane boom according to claim 3, characterized in that: The rear end surface of the fixing strip (33) is provided with a guide groove (331) connected to the docking groove (330); the front inner wall of the guide groove (331) is inclined backwards near one end of the active frame (22); the cross section of the guide groove (331) is a right triangle when viewed from above; and the front end of the moving rod (310) on the secondary active frame (24) is chamfered.

5. The automatic lifting device for a crane boom according to claim 1, characterized in that: The locking unit (3) further comprises a support plate (32), the front end surface of the rear locking plate (30) being fixedly provided with the support plate (32), and the support plate (32) being located between the corresponding upper and lower locking plates (30), the front end surface of the support plate (32) being provided with a plug-in slot, and the rear end surface of the front locking plate (30) being fixedly provided with a plug-in column (320) pluggably matched with the plug-in slot.

6. The automatic lifting device for a crane boom according to claim 1, characterized in that: The adjustment mechanism (4) also includes a locking member (43). The front and rear transverse sections of the fixed frame (40) are movable forward and backward and are penetrated by movable columns. The opposite surfaces of the front and rear movable columns are fixedly provided with locking members (43) fixedly connected to the corresponding auxiliary ropes (23). A telescopic rod (430) is fixedly provided between the front and rear locking members (43). The left and right end surfaces of the central frame (2) are fixedly provided with horizontal plates (431) located above the line collection assembly (20). A sliding block (432) is slidably provided on the horizontal plate (431) to the left and right. The upper end surfaces of the two longitudinal sections on the fixed frame (40) are fixedly provided with limiting rods (433) with vertical axes that slide through the corresponding sliding blocks (432).

7. The automatic lifting device for a crane boom according to claim 5, characterized in that: A U-shaped plate (44) with an opening facing upward is slidably arranged on the moving rod (310) corresponding to the active frame (22) in a forward and backward manner. The U-shaped plate (44) is rotatably connected to the front end of the fixing bar (33). Positioning rods (440) are fixedly arranged on the rear end surfaces of the two vertical sections of the U-shaped plate (44). The positioning rods (440) are plug-fitted into the corresponding waist-shaped grooves (420).

8. The automatic lifting device for a crane boom according to claim 1, characterized in that: The cable collection assembly (20) comprises a fixed column (200), the central frame (2) is fixedly provided with a fixed column (200) with an axis extending from front to back, a partition ring (201) is fixedly sleeved on the fixed column (200), an auxiliary rope (23) is passed around the upper end of the fixed column (200), and two auxiliary ropes (23) are respectively located on the front and rear sides of the partition ring (201).

9. The automatic lifting device for a crane boom according to claim 1, characterized in that: The secondary movable frame (24) is provided with a pull wire group (45), and the pull wire group (45) includes a connecting block (450). The upper end surface of the secondary movable frame (24) is provided with two front-to-back symmetrical connecting blocks (450) for sliding back and forth. The two ends of the auxiliary rope (23) are respectively fixedly connected to two connecting blocks (450) on the two secondary movable frames (24) and opposite to each other on the left and right. The upper end surface of the secondary movable frame (24) is provided with a bidirectional threaded rod (451) whose axis extends from front to back through the rotation of the fixed block. The bidirectional threaded rod (451) passes through the corresponding two connecting blocks (450) and is threadedly matched with the two connecting blocks (450).

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