One-key hooking type counterweight and crane

Abstract

The application provides a one-key hanging type counterweight and crane, and belongs to the technical field of cranes and engineering machinery. The crane comprises a counterweight, the counterweight comprises a plurality of stacked counterweight blocks, adjacent counterweight blocks are connected through a connecting mechanism, the top surface of the top counterweight block is provided with a plurality of hanging lifting lugs, the hanging lifting lugs are provided with a hanging hole, the bottom of the plurality of counterweight blocks is provided with an oil cylinder positioning groove and a plurality of auxiliary positioning holes, the crane further comprises a rotating table and a frame, the rotating table is provided with a hanging lifting lug plug-in shaft mechanism, the frame is provided with a counterweight support, the counterweight support is provided with a lifting oil cylinder and a plurality of positioning blocks, the positioning blocks are respectively plugged into the auxiliary positioning holes, and the output shaft of the lifting oil cylinder is located in the oil cylinder positioning groove. The hanging mode is simple, the counterweight can be one-key hung and one-key removed, the hanging part is located outside, the staff can easily observe, and the splicing effect and splicing efficiency of the counterweight are improved.

Description

Technical Field

[0001] This invention relates to the field of crane and construction machinery technology, and in particular to a one-click attach counterbalance and crane. Background Technology

[0002] The counterweight is one of the important components of a crane, which determines the crane's lifting performance. During the crane's hoisting process, the counterweight needs to be assembled. Whether the counterweight is easy to assemble is an important indicator affecting the ease of use of the crane.

[0003] Reference Figures 8 to 10 This is currently the industry's first crane-mounted combined counterweight system. Its counterweight cylinder 003 is installed on the turntable 002, and the counterweight 001 rests on the frame. As the turntable 002 rotates to a certain angle, the cylinder rod 0031 of the counterweight cylinder 003 extends into the oblong hole of the counterweight 001. The turntable 002 rotates counterclockwise, and the tray 004 of the counterweight cylinder rod 0031 gets stuck in the notch of the internal column 005 of the counterweight 001. The cylinder rod 0031 retracts, thus completing the mounting of the counterweight 001.

[0004] Regarding the aforementioned technologies, during the attachment process, it is difficult for the operator to observe the relative position between the counterweight cylinder rod pallet and the counterweight, which can easily lead to the counterweight cylinder rod colliding with and bending the counterweight. The attachment process relies too heavily on the operator's skill level, which can affect the attachment effect of the counterweight. Summary of the Invention

[0005] The purpose of this invention is to provide a one-click attach / remove counterweight and crane. This attachment method is simple, enabling one-click attaching and dismounting of the counterweight. Furthermore, the attached portion is external, facilitating observation by workers, thereby improving the assembly effect and efficiency of the counterweight.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution: a one-click hook-on counterweight, comprising multiple stacked counterweight blocks, with multiple sets of connecting mechanisms between adjacent counterweight blocks, and adjacent counterweight blocks connected by the connecting mechanisms. The top surface of the top counterweight block is provided with multiple hook-on lugs, and hook-on holes are provided on the hook-on lugs. The bottom of the multiple counterweight blocks is provided with hydraulic cylinder positioning grooves and multiple auxiliary positioning holes, and the top surface of the top counterweight block is provided with hook-on positioning holes.

[0007] In practical use, this invention works as follows: Based on the required counterweight, an appropriate number of counterweight blocks are stacked and fixed using a connecting mechanism. The hook-on counterweight is then placed on the vehicle frame, and the piston shaft of the lifting cylinder is engaged in the cylinder positioning groove. The lifting cylinder then raises the hook-on counterweight, causing the hook-on lug to rise to the hook-on position. The hook-on pin of the insertion / removal shaft mechanism passes through the hook-on hole, thus hooking the counterweight. Afterward, the lifting cylinder and the hook-on counterweight disengage. This hook-on method is simple, and the hook-on part is external, making it easy for workers to observe. It allows for quick hook-on work, thereby improving the effectiveness of counterweight assembly.

[0008] Furthermore, the connecting mechanism includes a first connecting lug, a second connecting lug, and a positioning pin. The first connecting lug and the second connecting lug are respectively fixed on adjacent counterweights, and the positioning pin is engaged in the round holes of the first connecting lug and the second connecting lug.

[0009] By adopting the above technical solution, when splicing the counterweights, after stacking the counterweights, the positioning pins are inserted into the round holes of the first connecting lug and the second connecting lug. Through the combined action of multiple sets of connecting mechanisms, the fixed connection of adjacent counterweights is achieved, and the splicing method is simple and reliable.

[0010] Furthermore, the connecting mechanism also includes a clip, the positioning pin is a T-shaped flat-head pin, the circumferential wall of the T-shaped flat-head pin is provided with a snap-fit ​​hole, the clip is snapped into the snap-fit ​​hole, and the first connecting lug and the second connecting lug are located between the large end of the T-shaped flat-head pin and the clip.

[0011] By adopting the above technical solution, after inserting the T-shaped flat-head pin into the round hole of the first connecting lug and the second connecting lug, the clip is inserted into the snap-fit ​​hole, so that the clip and the large end of the T-shaped flat-head pin are distributed on both sides of the first connecting lug and the second connecting lug, which limits the T-shaped flat-head pin and prevents it from detaching from the first connecting lug and the second connecting lug, thereby improving the stability of the connection.

[0012] To better achieve the above-mentioned objectives, the present invention also provides a crane, including the aforementioned one-click hook-on counterweight, a turntable, and a frame. The turntable is equipped with multiple sets of plug-in shaft mechanisms for hooking onto the hook-on lugs. The turntable is also equipped with multiple sets of positioning mechanisms for positioning the hook-on lugs. A counterweight support is mounted on the frame, and a lifting cylinder and multiple positioning blocks are mounted on the counterweight support. The multiple positioning blocks are respectively engaged with multiple auxiliary positioning holes. The output shaft of the lifting cylinder is vertically positioned and located within the cylinder positioning groove.

[0013] By adopting the above technical solution, the hook-on counterweight is placed on the frame, the positioning block is inserted into the auxiliary positioning hole, and the piston shaft of the lifting cylinder is engaged in the positioning groove of the cylinder, thus positioning the hook-on counterweight on the frame. Then, the lifting cylinder drives the hook-on counterweight upward, raising the hook-on lug to the hook-on position. The output end of the plug-in shaft mechanism passes through the hook-on hole, achieving the hook-on of the counterweight. Multiple sets of plug-in shaft mechanisms work together to lift the hook-on counterweight, improving the hook-on stability. Afterward, the lifting cylinder and the hook-on counterweight are disengaged. This hook-on method is simple, and the hook-on part is external, making it easy for workers to observe and enabling quick hook-on work, thereby improving the assembly effect of the counterweight. When it is necessary to remove the hook-on counterweight, simply reverse the hook-on process to remove it, achieving a one-click hook-on and hook-off function that is simple and efficient.

[0014] Furthermore, a support tray is coaxially fixed to the top surface of the lifting cylinder output shaft, and the support tray and the cylinder positioning groove are engaged.

[0015] By adopting the above technical solution, the support tray has a large area, which can improve the stability of the hanging counterbalance support. In addition, the support tray can be engaged with the positioning groove of the hydraulic cylinder, which can further improve the stability of the hanging counterbalance during the lifting process.

[0016] Furthermore, the insertion and removal shaft mechanism includes an insertion and removal cylinder and a hook pin. The insertion and removal cylinder is fixed on the rotating table, and the output shaft of the insertion and removal cylinder is horizontally arranged. The hook pin is coaxially fixed on the output shaft of the insertion and removal cylinder and is inserted into the hook hole.

[0017] By adopting the above technical solution, when the hang-on counterweight rises to the hang-on position, the plug-in cylinder drives the hang-on pin to pass into the hang-on hole, thereby achieving the hoisting support of the hang-on counterweight. With the combined action of multiple hang-on pins and multiple hang-on lugs, the hoisting stability of the hang-on counterweight is improved.

[0018] Furthermore, the positioning mechanism includes two positioning ear plates, the hook-hanging lug is located between the two positioning ear plates, and the hook-hanging pin passes through the round holes of the two positioning ear plates.

[0019] By adopting the above technical solution, after the lifting cylinder lifts the hook-type counterweight to the hooking position, the hooking lug is located between the two positioning lugs, thereby limiting the hooking lug in the horizontal direction. After the hooking pin is inserted into the hooking hole, it positions the hooking lug in the vertical direction. Therefore, after the hook-type counterweight is hoisted, it is not easy for the hook-type counterweight to deviate, and the hooking method is stable.

[0020] Furthermore, the counterweight support includes a first support frame, a second support frame, and a connecting frame. The first support frame and the second support frame are fixed at both ends of the connecting frame and are fixed on the vehicle frame. The top surfaces of the first support frame and the second support frame are flush. A plurality of positioning blocks are symmetrically distributed on the top of the first support frame and the second support frame. The top surface of the connecting frame is lower than the top surface of the first support frame. The lifting cylinder is mounted on the connecting frame.

[0021] By adopting the above technical solution, due to the low height of the connecting frame, the height of the support tray and the positioning block remains consistent when the lifting cylinder is not in operation. When the hanging counterweight is placed on the counterweight bracket, the top surfaces of the first and second support frames and the support tray jointly support the hanging counterweight. This type of counterweight bracket not only satisfies the support effect for the hanging counterweight but also facilitates the docking of the lifting cylinder and the cylinder positioning groove of the hanging counterweight.

[0022] Furthermore, the bottom end of the rotating platform tail frame is provided with multiple positioning bosses, which are engaged with the mounting positioning holes.

[0023] By adopting the above technical solution, when the hanging counterweight moves to the hanging position, the positioning boss engages with the hanging positioning hole, ensuring that the hanging counterweight is aligned and that the hanging pin can be smoothly inserted into the hanging hole, thus achieving the hanging of the hanging counterweight.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. The counterweight structure and crane provided by this invention can realize the one-click hanging and dismantling function of counterweight, which is simple and efficient to operate.

[0026] 2. The hanging structure consisting of the hanging pin and the hanging lug of the present invention is located on the outside, making it easy to observe the hanging status of the counterweight.

[0027] 3. The counterweights provided by this invention can be freely combined into counterweights of different weights, and the counterweights of different weights can be used by the crane to achieve the hanging of counterweights of different weights. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0029] Figure 1 This is a schematic diagram of the bottom structure of the one-click attach counterweight according to an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the structure of the top of the one-click attach counterweight according to an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the structure of the T-type flat-head pin according to an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram of the structure of a crane according to an embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of the rotating platform according to an embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of the insertion and removal shaft mechanism according to an embodiment of the present invention.

[0035] Figure 7 This is a schematic diagram of the structure of the counterweight support according to an embodiment of the present invention.

[0036] Figure 8 This is a schematic diagram of the balance weight connection process in the background technology.

[0037] Figure 9 This is a schematic diagram of the balance weight connection process in the background technology.

[0038] Figure 10 This is a schematic diagram of the state of the counterweight cylinder when it is retracted in the background art.

[0039] The attached figures are labeled as follows: 001, counterweight; 002, turntable; 003, hydraulic cylinder; 0031, cylinder rod; 004, pallet; 005, column; 1, counterweight block; 2, connecting mechanism; 21, first connecting lug; 22, second connecting lug; 23, positioning pin; 231, T-shaped flat-head pin; 24, clip; 3, hook-on lug; 4, hook-on hole; 5, hydraulic cylinder positioning groove; 6, auxiliary positioning hole; 7, snap-on hole; 8, turntable; 9, frame; 10, insertion / removal shaft mechanism; 101, insertion / removal hydraulic cylinder; 102, hook-on pin shaft; 11, positioning mechanism; 111, positioning lug plate; 12, counterweight bracket; 121, first support frame; 122, second support frame; 123, connecting frame; 13, lifting hydraulic cylinder; 14, positioning block; 15, support pallet; 16, hook-on positioning hole; 17, positioning boss. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0041] Example:

[0042] Reference Figures 1 to 3 The present invention provides a one-click hook-on counterweight, comprising multiple stacked counterweight blocks 1, with multiple sets of connecting mechanisms 2 between adjacent counterweight blocks 1, connecting adjacent counterweight blocks 1 via the connecting mechanisms 2. Multiple hook-on lugs 3 are welded to the top surface of the top counterweight block 1, and hook-on holes 4 are formed on the hook-on lugs 3 in the horizontal direction. Each counterweight block 1 has a hydraulic cylinder positioning groove 5 and two auxiliary positioning holes 6 at its bottom. The two auxiliary positioning holes 6 are symmetrically distributed on both sides of the positioning groove, and the diameter of the hydraulic cylinder positioning groove 5 is larger than the diameter of the auxiliary positioning holes 6. According to the counterweight requirements, an appropriate number of counterweight blocks 1 are selected and stacked, and fixed by the connecting mechanisms 2. Different combinations of different numbers of counterweight blocks 1 can form counterweights of different weights. Two hook-on positioning holes 16 are formed on the top surface of the top counterweight block 1.

[0043] Reference Figures 1 to 3 Multiple sets of connecting mechanisms 2 are evenly distributed on the four sides of the counterweight 1. Specifically, the connecting mechanism 2 includes a first connecting lug 21, a second connecting lug 22, a positioning pin 23, and a clip 24. The first connecting lug 21 and the second connecting lug 22 are welded and fixed to adjacent counterweights 1 respectively. When the counterweights 1 are stacked, the first connecting lug 21 and the second connecting lug 22 are positioned close to each other. The positioning pin 23 is engaged in the round hole of the first connecting lug 21 and the round hole of the second connecting lug 22. In this embodiment, the positioning pin 23 is a T-shaped flat-head pin 231. The circumferential wall of the T-shaped flat-head pin 231 has a locking hole 7, and the clip 24 is engaged in the locking hole 7. The first connecting lug 21 and the second connecting lug 22 are located between the large end of the T-shaped flat-head pin 231 and the clip 24. In this way, the assembly work between adjacent counterweights 1 can be realized. Under the joint action of multiple sets of connecting mechanisms 2, the connection stability between adjacent counterweights 1 is improved. Because the clip 24 is elastically engaged within the clip hole 7, it is easy to remove. The connecting mechanism 2 enables quick assembly and disassembly of the counterweights 1.

[0044] Reference Figures 4 to 7The present invention also provides a crane, including the aforementioned one-click hook-on counterweight, a turntable 8, and a frame 9. Two sets of plug-in shaft mechanisms 10 are installed on the turntable 8 for hooking onto the hook-on lugs 3. Multiple sets of positioning mechanisms 11 for positioning the hook-on lugs 3 are also installed on the turntable 8. A counterweight bracket 12 is installed on the frame 9, and a lifting cylinder 13 and multiple positioning blocks 14 are installed on the counterweight bracket 12. The multiple positioning blocks 14 are respectively plugged into multiple auxiliary positioning holes 6. The output shaft of the lifting cylinder 13 is vertically arranged, and a support tray 15 is coaxially fixed to the top of the output shaft of the lifting cylinder 13. The support tray 15 is engaged with the cylinder positioning groove 5. The large area of ​​the support tray 15 improves the stability of the hook-on counterweight, and the engagement of the support tray 15 with the cylinder positioning groove 5 further enhances the stability during the lifting process of the hook-on counterweight.

[0045] Reference Figure 6 Specifically, the insertion / removal shaft mechanism 10 includes an insertion / removal cylinder 101 and a hook pin 102. The insertion / removal cylinder 101 is fixed on the rotating table 8, and its output shaft is horizontally positioned. The hook pin 102 is coaxially fixed on the output shaft of the insertion / removal cylinder 101 and is used to engage with the hook hole 4. The positioning mechanism 11 includes two positioning lugs 111. After the hook-type counterweight is attached, the hook lug 3 is located between the two positioning lugs 111, and the hook pin 102 is inserted into the round holes of the two positioning lugs 111 and the hook hole 4.

[0046] When attaching the counterweight, it is placed on the frame 9, with the positioning block 14 inserted into the auxiliary positioning hole 6, and the support tray 15 of the lifting cylinder 13 engaged in the cylinder positioning groove 5, thus positioning the counterweight on the frame 9. Then, the lifting cylinder 13 is controlled by the program to raise the counterweight, causing the attachment lug 3 to rise to the attachment position. The cylinder length and pressure value of the lifting cylinder 13 are used to determine whether the counterweight has reached the attachment position. At this point, the hanging lug 3 is positioned between the two positioning lugs 111. Then, the insertion / removal cylinder 101 drives the hanging pin 102 to pass through the hanging hole 4 and the round holes of the two positioning lugs 111, thus supporting the hanging counterweight during lifting. Successful insertion is determined by whether the insertion / removal cylinder 101 reaches the set cylinder length. The combined action of multiple hanging pins 102 and multiple hanging lugs 3 improves the lifting stability of the hanging counterweight. Afterwards, the lifting cylinder 13 retracts, the support tray 15 disengages from the hanging counterweight, and the one-click attachment of the hanging counterweight is completed. This attachment method is simple, and the attachment part is external, making it easy for workers to observe. It allows for quick attachment work, thereby improving the overall effect of counterweight assembly.

[0047] When it is necessary to remove the hook-on counterweight, the hooking process is simply reversed. The program controls the piston shaft of the lifting cylinder 13 to extend and contact the hook-on counterweight, applying pressure. By detecting the pressure and cylinder length of the lifting cylinder 13, it is determined whether the lifting cylinder 13 has moved into position. Then, the insertion / removal cylinder 101 retracts, causing the hook pin 102 to be pulled out from the hook hole 4. When the insertion / removal cylinder 101 reaches the set cylinder length, it is determined that the pin has been successfully removed. Afterward, the lifting cylinder 13 lowers the hook-on counterweight onto the counterweight bracket 12, thus achieving one-click removal of the counterweight. Through the above method, the hook-on counterweight can be quickly installed and removed.

[0048] Reference Figure 2 and Figure 5 It should be added that the bottom end of the tail frame of the rotating platform 8 is provided with two positioning bosses 17, which are used to engage with the two mounting positioning holes 16 respectively. When the mounting counterweight moves to the mounting position, the positioning bosses 17 are engaged in the mounting positioning holes 16 to ensure that the mounting counterweight is aligned and that the mounting pin 102 can be smoothly inserted into the mounting hole 4 to achieve the mounting of the mounting counterweight.

[0049] It should be noted that the driving components described above are not limited to hydraulic cylinders; pneumatic cylinders or motors can also be used as alternatives.

[0050] Reference Figure 7 The counterweight support 12 includes a first support frame 121, a second support frame 122, and a connecting frame 123. The first support frame 121 and the second support frame 122 are fixed at both ends of the connecting frame 123. The first support frame 121 and the second support frame 122 are fixed on the vehicle frame 9. The top surfaces of the first support frame 121 and the second support frame 122 are flush. Two positioning blocks 14 are symmetrically distributed on the top of the first support frame 121 and the second support frame 122. The connecting frame 123 has an overall V-shaped structure. The top surface of the connecting frame 123 is lower than the top surface of the first support frame 121. The lifting cylinder 13 is installed in the middle area of ​​the connecting frame 123.

[0051] Because the connecting frame 123 is relatively low, the heights of the support tray 15 and the positioning block 14 remain consistent when the lifting cylinder 13 is not in operation. When the hanging counterweight is placed on the counterweight bracket 12, the top surfaces of the first support frame 121, the second support frame 122, and the support tray 15 jointly support the hanging counterweight. This type of counterweight bracket 12 not only provides effective support for the hanging counterweight but also facilitates the docking of the lifting cylinder 13 with the cylinder positioning groove 5 of the hanging counterweight.

[0052] The implementation principle of a crane according to an embodiment of the present invention is as follows: When attaching the hook-on counterweight, the hook-on counterweight is placed on the frame 9, so that the positioning block 14 is inserted into the auxiliary positioning hole 6, and the support tray 15 of the lifting cylinder 13 is engaged in the cylinder positioning groove 5, thereby achieving the positioning of the hook-on counterweight on the frame 9. Then, the lifting cylinder 13 is controlled by the program to drive the hook-on counterweight to rise, so that the hook-on lug 3 is raised to the attachment position. The cylinder length and pressure value of the lifting cylinder 13 are used to determine whether the hook-on counterweight has reached the attachment position. At this point, the hanging lug 3 is positioned between the two positioning lugs 111. Then, the insertion / removal cylinder 101 drives the hanging pin 102 to pass through the hanging hole 4 and the round holes of the two positioning lugs 111, thus supporting the hanging counterweight during lifting. Successful insertion is determined by whether the insertion / removal cylinder 101 reaches the set cylinder length. The combined action of multiple hanging pins 102 and multiple hanging lugs 3 improves the lifting stability of the hanging counterweight. Afterwards, the lifting cylinder 13 retracts, the support tray 15 detaches from the hanging counterweight, and the one-click attachment of the hanging counterweight is completed. The removal process of the hanging counterweight is the reverse of the attachment process. This attachment method is simple, and the attachment part is external, making it easy for workers to observe. It allows for quick one-click attachment and removal, thereby improving the assembly effect and speed of the counterweight.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A crane, characterized in that, This includes a one-button-attached counterbalance weight, which comprises: It includes multiple stacked counterweights (1), and multiple sets of connecting mechanisms (2) are provided between adjacent counterweights (1). Adjacent counterweights (1) are connected by the connecting mechanisms (2). The top surface of the top counterweight (1) is provided with multiple hanging lugs (3), and the hanging lugs (3) are provided with hanging holes (4). The bottom of the multiple counterweights (1) is provided with cylinder positioning grooves (5) and multiple auxiliary positioning holes (6). The top surface of the top counterweight (1) is provided with hanging positioning holes (16). The connecting mechanism (2) includes a first connecting lug (21), a second connecting lug (22), and a positioning pin (23). The first connecting lug (21) and the second connecting lug (22) are respectively fixed on adjacent counterweights (1), and the positioning pin (23) is engaged in the round hole of the first connecting lug (21) and the round hole of the second connecting lug (22). The connecting mechanism (2) also includes a clip (24), the positioning pin (23) is a T-shaped flat-head pin (231), the T-shaped flat-head pin (231) has a snap-fit ​​hole (7) on its circumferential wall, the clip (24) is snapped into the snap-fit ​​hole (7), the first connecting lug (21) and the second connecting lug (22) are located between the large end of the T-shaped flat-head pin (231) and the clip (24); The crane also includes a rotating platform (8) and a frame (9). The rotating platform (8) is provided with multiple sets of plug-in shaft mechanisms (10), which are used to attach the hook lugs (3). The rotating platform (8) is provided with multiple sets of positioning mechanisms (11) for positioning the hook lugs (3). The frame (9) is provided with a counterweight support (12), which is provided with a lifting cylinder (13) and multiple positioning blocks (14). The multiple positioning blocks (14) are respectively plugged into multiple auxiliary positioning holes (6). The output shaft of the lifting cylinder (13) is vertically arranged and located in the cylinder positioning groove (5). The insertion and removal shaft mechanism (10) includes an insertion and removal cylinder (101) and a hook pin (102). The insertion and removal cylinder (101) is fixed on the rotating table (8). The output shaft of the insertion and removal cylinder (101) is horizontally arranged. The hook pin (102) is coaxially fixed on the output shaft of the insertion and removal cylinder (101). The hook pin (102) is inserted into the hook hole (4). The positioning mechanism (11) includes two positioning ear plates (111), the hooking lug (3) is located between the two positioning ear plates (111), and the hooking pin (102) passes through the round hole of the two positioning ear plates (111).

2. A crane according to claim 1, characterized in that, The top surface of the output shaft of the lifting cylinder (13) is coaxially fixed with a support tray (15), and the support tray (15) and the cylinder positioning groove (5) are engaged.

3. A crane according to claim 2, characterized in that, The counterweight support (12) includes a first support frame (121), a second support frame (122), and a connecting frame (123). The first support frame (121) and the second support frame (122) are fixed at both ends of the connecting frame (123). The first support frame (121) and the second support frame (122) are fixed on the vehicle frame (9). The top surfaces of the first support frame (121) and the second support frame (122) are flush. A plurality of positioning blocks (14) are symmetrically distributed on the top of the first support frame (121) and the second support frame (122). The top surface of the connecting frame (123) is lower than the top surface of the first support frame (121). The lifting cylinder (13) is installed on the connecting frame (123).

4. A crane according to claim 3, characterized in that, The bottom end of the tail frame of the rotating platform (8) is provided with multiple positioning bosses (17), and the positioning bosses (17) and the hook positioning holes (16) are inserted and matched.

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