Hoisting assembly for a crane

Abstract

The application provides a lifting assembly for a crane and relates to the technical field of lifting assemblies. The lifting assembly is used on a double-beam crane and comprises a group of parallel beams and a walking frame on the double-beam crane. The top of each beam is provided with a sliding track, and the bottom of the walking frame and close to both ends are provided with walking wheel assemblies. The walking wheel assemblies are in sliding connection with the sliding tracks, and the walking wheel assemblies are in frictional contact with the side surfaces of the sliding tracks. The lifting assembly further comprises a brake mechanism for braking the power wheel assemblies. The brake mechanism comprises a stop pawl assembly and a stop pawl driving member. The stop pawl assembly is rotationally connected to the bottom of the walking frame, and the stop pawl driving member is fixedly connected to the bottom of the walking frame. The action end of the stop pawl driving member is in transmission connection with the stop pawl assembly. The walking frame can be stopped and fixed at any position, the walking frame is not prone to shaking and local displacement during lifting work, the safety of construction is ensured, and the performance of the crane is improved.

Description

Technical Field

[0001] This invention relates to the field of lifting assembly technology, specifically to lifting assemblies for cranes. Background Technology

[0002] Double-girder cranes are indispensable in road construction, especially in rail construction. A double-girder crane mainly consists of a ground traveling section, a frame section, and a lifting assembly. The ground traveling section can be either rail-mounted or railless. The frame section relies on the strength of the steel structure to provide support. The lifting assembly is the most crucial part, directly determining the crane's working performance.

[0003] When applying for this invention, the applicant, through a search, discovered a Chinese patent disclosing a "beam crane with an upper-mounted angled trolley," application number "201610566849.4." This patent discloses a main beam with both ends fixedly connected to end beams, and an outer edge beam plate extending from the main web and secondary web of the main beam. An angled trolley is mounted on the main beam, and a square track is welded to the upper surface of the main beam's upper cover plate. The angled trolley rolls along the square track, and running stops are welded to both ends of the square track. Although running stops at both ends can position the crane, it still relies on power self-locking for positioning when in the middle position. If the self-locking structure fails, serious consequences will occur. Therefore, this invention provides a lifting assembly with a stop claw assembly to improve the safety of the beam crane. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a lifting assembly for cranes, which solves the problem of low safety performance when the crane trolley stops at any intermediate position, mainly relying on the self-locking of the power components to fix the position.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a lifting assembly for a crane, used on a double-girder crane, comprising a set of beams and a traveling frame arranged in parallel on the double-girder crane, a sliding rail provided at the top of the beams, traveling wheel assemblies provided at the bottom of the traveling frame and near both ends, a power wheel assembly provided at the bottom of the traveling frame and inside the traveling wheel assemblies, a connecting assembly fixedly connected to the middle of the traveling frame, a stranded roller, a self-locking motor, and a transmission assembly connecting the stranded roller and the self-locking motor fixedly connected to the bottom of the connecting assembly, a lifting rope extending from below the stranded roller, and a lifting hook connected to the bottom of the lifting rope via a connector; The walking wheel assembly is slidably connected to the sliding rail, and the power wheel assembly is in frictional contact with the side of the sliding rail; It also includes a braking mechanism for braking the power wheel assembly. The braking mechanism includes a stop pawl assembly and a stop pawl drive member. The stop pawl assembly is rotatably connected to the bottom of the walking frame, and the stop pawl drive member is fixedly connected to the bottom of the walking frame. The actuating end of the stop pawl drive member is drive-connected to the stop pawl assembly.

[0006] Preferably, the stop claw assembly includes a connecting frame fixedly connected to the traveling frame, a brake arm rotatably connected to the bottom of the connecting frame, an inner arc-shaped surface that cooperates with the power wheel assembly on the inner side of the brake arm, an arc-shaped claw connected to one end of the brake arm through an elastic part, the arc-shaped claw having an arc-shaped surface that cooperates with the power wheel assembly on the inner side of the arc-shaped claw, and a pressing surface parallel to the side of the sliding track at the end of the arc-shaped claw.

[0007] Preferably, the stop pawl drive component includes a cross column and a connecting rod. Both ends of the cross column are fixedly connected to the traveling frame. A connecting seat is fixedly connected to one side of the cross column. A bidirectional hydraulic cylinder is fixedly connected to the bottom of the connecting seat. One end of the connecting rod is movably connected to the end of the bidirectional hydraulic cylinder, and the other end of the connecting rod is movably connected to the brake arm.

[0008] Preferably, the top of the sliding track is provided with a sliding groove, and both the left and right sides of the sliding groove are provided with stepped portions, and the top side of the sliding groove is provided with an inclined portion.

[0009] Preferably, the walking wheel assembly includes a sliding frame with an elongated slot at its top. Crossbeams are provided at both ends of the walking frame. The sliding frame is slidably connected to the crossbeams, and a positioning screw is provided at the top of the crossbeams. The positioning screw passes through the elongated slot and is threadedly connected to the top of the crossbeams. A support plate is fixedly connected to the bottom of the sliding frame. Two sets of parallel side plate frames are fixedly connected to the bottom of the support plate. A roller body is movably connected to the inner side of each side plate frame via a roller mounting component. A positioning plate is fixedly connected to the outer side of each side plate frame, and a guide slope corresponding to the inclined portion is provided at the bottom of the positioning plate.

[0010] Preferably, the power wheel assembly includes a mounting plate fixed to the bottom of the walking frame, a power wheel body rotatably connected to the bottom of the mounting plate, a power box fixedly connected to the top of the mounting plate, and the output end of the power box being drivenly connected to the power wheel body.

[0011] Preferably, the connector includes two sets of parallel limiting frames, with a large wheel and a small wheel rotatably connected to the inner side of the limiting frame. The large wheel is connected to the lifting rope, and the small wheel is connected to the locking rope at the top of the hook.

[0012] Preferably, the power wheel assembly is provided in four sets and distributed at the four corners of the walking frame, the stop pawl assembly is provided in four sets and corresponds one-to-one with the power wheel assembly, and the stop pawl drive is provided in two sets, one set of the stop pawl drive controls the action of two stop pawl assemblies located on the same side.

[0013] This invention provides a lifting assembly for a crane. It offers the following advantages: 1. This invention, by setting a stop pawl drive component and a stop pawl assembly that are movably connected, when the crane needs to stop, controls the stop pawl drive component to move, pulling the stop pawl assembly inward so that it is tightly attached to the power wheel assembly, thereby achieving a braking effect. This allows the traveling frame to be stopped and fixed at any position. During lifting operations, the traveling frame is less prone to shaking and local displacement, ensuring construction safety and improving the performance of the crane.

[0014] Furthermore, an arc-shaped claw is connected to the end of the brake arm via an elastic part. The inner side of the arc-shaped claw engages with the drive wheel. When the brake arm moves, it also controls the inner side of the arc-shaped claw to contact the drive wheel. Due to the presence of the elastic part, there is no large clamping force. However, when the drive wheel rotates, it will drive the arc-shaped claw to move towards the side closer to the sliding rail. When the designated signal is issued, if the brake arm fails to brake the drive wheel within a short distance, the drive wheel will carry the arc-shaped claw to the gap between the drive wheel and the side of the sliding rail. This causes a huge compressive force to be generated between the end pressing surface of the arc-shaped claw and the sliding rail. Moreover, this compressive force will increase geometrically as the drive wheel continues to rotate, eventually locking and fixing the traveling frame. This self-locking structure is very firmly fixed, greatly shortening the braking distance. Moreover, it can act as a final safety barrier when the inner arc surface of the brake arm is worn and becomes smooth, making braking impossible, thus ensuring the safety of crane operation.

[0015] 2. This invention improves the structure of the sliding track and traveling wheel assembly, enabling it to withstand greater loads. When the roller body is deformed under pressure, the side plate frame directly presses against the step, providing support and preventing further damage to the roller body, thus providing self-protection. When the side plate frame contacts the step, the rolling motion changes back to sliding, increasing friction. Under the same gear (same power), the speed of the power wheel assembly will significantly decrease, allowing for slow operation under high loads and faster operation under low loads, ensuring the safety of the device. By setting mutually cooperating inclined parts and guide slopes, the left and right lateral movement of the traveling wheel assembly can be prevented, avoiding tilting forces that could exacerbate damage to the sides of the sliding track. This structural design improves the service life of the device. Attached Figure Description

[0016] Figure 1This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the front structure of the present invention; Figure 3 This is a schematic diagram of the side structure of the present invention; Figure 4 This is a partial top view of the present invention; Figure 5 This is a three-dimensional schematic diagram of the walking frame of the present invention; Figure 6 for Figure 5 Enlarged view at point B in the middle; Figure 7 This is a partial three-dimensional schematic diagram of the present invention; Figure 8 This is a three-dimensional schematic diagram of the walking wheel assembly of the present invention; Figure 9 for Figure 2 Enlarged view of point A in the middle; Figure 10 This is a three-dimensional schematic diagram of the hook structure.

[0017] Among them, 1. Stop pawl drive component; 101. Horizontal column; 102. Connecting seat; 103. Two-way hydraulic cylinder; 104. Connecting rod; 2. Beam; 3. Sliding rail; 31. Sliding groove; 32. Stepped part; 33. Inclined part; 4. Traveling frame; 5. Traveling wheel assembly; 51. Sliding frame; 52. Long slot hole; 53. Support plate; 54. Side plate frame; 55. Roller mounting component; 56. Roller body; 57. Positioning plate; 58. Guide slope; 6. Power wheel assembly; 6. Power 61. Wheel assembly; 62. Mounting plate; 63. Drive wheel body; 7. Power box; 8. Hook; 8. Stop pawl assembly; 81. Connecting frame; 82. Brake arm; 83. Inner arc surface; 84. Elastic part; 85. Arc pawl; 86. Extrusion surface; 9. Connecting assembly; 10. Stranded roller; 11. Self-locking motor; 12. Transmission assembly; 13. Lifting rope; 14. Connector; 14. Connector; 141. Large wheel; 142. Small wheel; 143. Limiting frame. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example: Figures 1-10As shown, this embodiment of the invention provides a lifting assembly for a crane, used on a double-girder crane, including a set of beams 2 and a traveling frame 4 arranged in parallel on the double-girder crane. The traveling frame 4 slides along the length of the beams 2. A sliding track 3 is provided on the top of the beams 2. Traveling wheel assemblies 5 are provided on the bottom of the traveling frame 4 and near both ends. A power wheel assembly 6 is provided on the bottom of the traveling frame 4 and inside the traveling wheel assembly 5. The traveling frame 2 rolls along the side of the power wheel assembly 6. Therefore, the side of the power wheel assembly 6 can be provided with anti-slip texture. A connecting assembly 9 is fixedly connected to the middle of the traveling frame 4. A stranded roller 10, a self-locking motor 11, and a transmission assembly 12 connecting the stranded roller 10 and the self-locking motor 11 are fixedly connected to the bottom of the connecting assembly 9. The transmission assembly 12 adopts a gear reduction mechanism to reduce the speed of the self-locking motor 11 and increase the torque. A lifting rope 13 extends from the bottom of the stranded roller 10. The bottom of the lifting rope 13 is connected to a hook 7 through a connector 14. During lifting, the self-locking motor 11 drives the twisted wire roller 10 to rotate, which in turn moves the lifting rope 13 up and down to lift the goods. The hook 7 is used to hold the goods. The walking wheel assembly 5 is slidably connected to the sliding rail 3, and the power wheel assembly 6 is in frictional contact with the side of the sliding rail 3; The traveling wheel assembly 5 cooperates with the sliding rail 3 to achieve the functions of sliding and guiding. The power wheel assembly 6 is driven by its own power component and makes frictional contact with the side of the sliding rail 3 to achieve the purpose of driving the traveling frame 4 to move. In order to increase the friction between the traveling wheel assembly 5 and the sliding rail 3, the coefficient of friction can be appropriately increased. Based on this structural improvement, a gear or rack structure is adopted, which should also fall within the scope of protection of this invention.

[0020] It also includes a braking mechanism for braking the power wheel assembly 6. The braking mechanism includes a stop pawl assembly 8 and a stop pawl drive member 1. The stop pawl assembly 8 is rotatably connected to the bottom of the walking frame 4, and the stop pawl drive member 1 is fixedly connected to the bottom of the walking frame 4. The actuating end of the stop pawl drive member 1 is connected to the stop pawl assembly 8 in a transmission connection.

[0021] This device is installed on a double-girder crane. It relies on the ground traveling mechanism of the double-girder crane to carry the longitudinal movement of the device. The power wheel assembly 6 cooperates with the side of the sliding rail 3 to achieve lateral movement. The lifting rope 13 carries the hook 7 to move up and down to achieve the function of lifting and picking up goods.

[0022] Reference Appendix Figure 5 , Figure 6In this embodiment, the stop claw assembly 8 includes a connecting frame 81 fixedly connected to the walking frame 4. A brake arm 82 is rotatably connected to the bottom of the connecting frame 81. The inner side of the brake arm 82 is provided with an inner arc-shaped surface 83 that cooperates with the power wheel assembly 6. One end of the brake arm 82 is connected to an arc-shaped claw 85 through an elastic part 84. The inner side of the arc-shaped claw 85 has an arc-shaped surface that cooperates with the power wheel assembly 6. The end of the arc-shaped claw 85 is provided with a pressing surface 86 that is parallel to the side of the sliding track 3.

[0023] The stop pawl assembly 8 is driven by the stop pawl drive member 1, which pulls the brake arm 82 inward, causing it to rotate around the connection point between the connecting frame 81 and the brake arm 82. The inner arc-shaped surface 83 on the inner side of the brake arm 82 will fit against the power wheel assembly 6 to achieve the effect of friction braking. If the friction contact surface wears down, fails, or the braking effect is poor, the movement distance of the power wheel assembly 6 increases, which will carry the arc-shaped pawl 85 towards the sliding rail 3, so that the pressing surface 86 at the end of the arc-shaped pawl 85 contacts the sliding rail 3, and the pressing effect is achieved (the braking effect generated here is superimposed with the braking effect generated by the inner arc-shaped surface 83 on the inner side of the brake arm 82). As the power wheel assembly 6 continues to rotate, the pressing force between the arc-shaped pawl 85 and the side of the sliding rail 3 will increase exponentially, ensuring the braking effect. This structure can accurately control the braking distance. After operator training, the operator can accurately control the position.

[0024] Reference Appendix Figure 4 In this embodiment, the stop claw drive component 1 includes a horizontal column 101 and a connecting rod 104. Both ends of the horizontal column 101 are fixedly connected to the walking frame 4. A connecting seat 102 is fixedly connected to one side of the horizontal column 101. A bidirectional hydraulic cylinder 103 is fixedly connected to the bottom of the connecting seat 102. One end of the connecting rod 104 is movably connected to the end of the bidirectional hydraulic cylinder 103, and the other end of the connecting rod 104 is movably connected to the brake arm 82.

[0025] The crossbar 101 and the connecting seat 102 are both structures that serve a connecting function. When the bidirectional hydraulic cylinder 103 is activated, it will pull the connecting rod 104 inward, and then drive the brake arm 82 inward to achieve braking. The bidirectional hydraulic cylinder 103 can provide sufficient braking force to ensure the braking effect.

[0026] Reference Appendix Figure 1 , Figure 9 In this embodiment, a sliding groove 31 is provided at the top of the sliding track 3, and stepped portions 32 are provided on both the left and right sides of the sliding groove 31. An inclined portion 33 is provided at the top side of the sliding groove 31.

[0027] The sliding groove 31 is width-matched with the roller body 56, allowing the roller body 56 to slide within the sliding groove 31. This serves to limit the position of the roller body 56 and also acts as a guide. The step portion 32 engages with the side plate frame 54. The outer side of the roller body 56 is made of rubber. When subjected to excessive load, the outer rubber will deform. At this time, the side plate frame 54 contacts the step portion 32, providing auxiliary support and increasing sliding resistance. The inclined portion 33 engages with the guide inclined surface 58 provided at the bottom of the positioning plate 57 to keep the roller body 56 in a centered position, preventing lateral tilting forces, reducing wear, improving the service life of the device, and enhancing safety.

[0028] Reference Appendix Figure 8 , Figure 9 In this embodiment, the walking wheel assembly 5 includes a sliding frame 51. The top of the sliding frame 51 is provided with a long slot 52. Crossbeams are provided at both ends of the walking frame 4. The sliding frame 51 is slidably connected to the crossbeams. The top of the crossbeams is provided with a positioning screw. The positioning screw passes through the long slot 52 and is threadedly connected to the top of the crossbeams. The bottom of the sliding frame 51 is fixedly connected with a support plate 53. The bottom of the support plate 53 is fixedly connected with two sets of parallel side plate frames 54. The inner side of the side plate frame 54 is movably connected with a roller body 56 through a roller mounting component 55. The outer side of the side plate frame 54 is fixedly connected with a positioning plate 57. The bottom of the positioning plate 57 is provided with a guide slope surface 58 corresponding to the inclined part 33.

[0029] The sliding frame 51 structure allows for adjustment of the installation position between the walking wheel assembly 5 and the walking frame 4. After adjustment, a positioning screw is threaded through the long slot 52 and connected to the top of the crossbeam. The top of the positioning screw presses against the top surface of the sliding frame 51 to achieve fixation. The support plate 53 serves as a connector, and its top support surface is slightly wider than that of the sliding frame 51, providing good support. Multiple sets of roller bodies 56 are arranged side by side to provide support (three sets are used in this embodiment, but the specific amount is determined based on the load of the application). The distance between the two sets of parallel side plate frames 54 is determined according to the position of the step 32, so that the step 32 is located directly below the side plate frame 54.

[0030] Reference Appendix Figure 7 The power wheel assembly 6 includes a mounting plate 61 fixed to the bottom of the walking frame 4. The bottom of the mounting plate 61 is rotatably connected to the power wheel body 62, and the top of the mounting plate 61 is fixedly connected to the power box 63. The output end of the power box 63 is connected to the power wheel body 62 in a transmission connection.

[0031] The power box 63 has a power structure inside. Through the transmission structure (using reduction gear transmission), the power wheels 62 on both sides rotate the same number of times, avoiding the problem of deviation. The sides of the power wheels 62 are provided with anti-slip texture.

[0032] The connector 14 includes two sets of parallel limiting frames 143. The inner side of the limiting frame 143 is rotatably connected to a large wheel 141 and a small wheel 142. The large wheel 141 is connected to the lifting rope 13, and the small wheel 142 is connected to the locking rope at the top of the hook 7.

[0033] Reference Appendix Figure 10 In this embodiment, the connector 14 mainly serves to connect the upper hoisting rope 13 with the lower hook 7. The arrangement of the large wheel 141 and the small wheel 142 can ensure the smooth upward movement of the hoisting rope 13.

[0034] The drive wheel assembly 6 has four sets, distributed at the four corners of the walking frame 4. The stop pawl assembly 8 has four sets, each corresponding to one of the drive wheel assemblies 6. The stop pawl drive member 1 has two sets, with one set of stop pawl drive member 1 controlling the movement of two stop pawl assemblies 8 located on the same side.

[0035] The power wheel assembly 6 is equipped with four sets, making the drive smoother. The stop pawl assembly 8 corresponds one-to-one with the power wheel assembly 6. When moving forward, the front arc-shaped pawl 85 will take effect, and when moving backward, the rear arc-shaped pawl 85 will take effect. This arrangement can achieve a braking effect in both directions (the inner arc-shaped surface 83 on the inner side of the brake arm plays a braking role, which will occur in both directions). The bidirectional hydraulic cylinder 103 in the stop pawl assembly 8 can drive the brake arms on both sides to move synchronously, and the front and rear power wheel assemblies 6 will brake synchronously.

[0036] Working principle: The stop pawl drive component 1 works in conjunction with the movable stop pawl assembly 8. When the crane needs to stop, the stop pawl drive component 1 is controlled to pull the stop pawl assembly 8 inward, so that it is tightly attached to the power wheel assembly 6, thereby achieving a braking effect. This allows the traveling frame to be stopped and fixed at any position. During lifting operations, the traveling frame 4 is less likely to sway or undergo local displacement, ensuring construction safety and improving the performance of the crane.

[0037] Specifically, the bidirectional hydraulic cylinder 103 operates, causing the brake arm 82 to rotate inward first. The inner arc-shaped surface 83 of the brake arm 82 engages with the outer surface of the power wheel 62 to achieve the braking effect. During braking, if the braking effect is poor and slippage occurs (under heavy loads, the inertia is very large), the inner side of the arc-shaped claw 85 engages with the power wheel 62. When the brake arm 82 moves, it also controls the inner side of the arc-shaped claw 85 to contact the power wheel 62. Due to the presence of the elastic part 84 (the elastic part 84 is a bending plate, which can extend or shorten by its own deformation), there will not be a large clamping force. However, when the power wheel 62 rotates, it will drive the arc-shaped claw 85 to engage with the power wheel 62. The claw 85 moves toward the side closer to the sliding rail 3. When the designated signal is issued, if the brake arm 82 fails to brake the power wheel 62 within a short distance, the power wheel 62 will carry the arc-shaped claw 85 to the gap between the power wheel 62 and the side of the sliding rail 3. This will generate a huge compressive force between the end pressing surface 86 of the arc-shaped claw 85 and the sliding rail 3. Moreover, this compressive force will increase exponentially as the power wheel 62 continues to rotate, eventually locking and fixing the traveling frame 4. This structure can greatly shorten the braking distance and can also act as a final safety barrier when the brake arm fails and braking cannot be achieved, ensuring the safety of crane operation.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lifting assembly for a crane, used on a double-girder crane, comprising a set of parallel beams (2) and a traveling frame (4) on the double-girder crane, characterized in that: The top of the beam (2) is provided with a sliding track (3), the bottom of the walking frame (4) and near both ends are provided with walking wheel assemblies (5), the bottom of the walking frame (4) and inside the walking wheel assembly (5) is provided with a power wheel assembly (6), the middle of the walking frame (4) is fixedly connected with a connecting assembly (9), the bottom of the connecting assembly (9) is fixedly connected with a twisted roller (10), a self-locking motor (11) and a transmission assembly (12) connecting the twisted roller (10) and the self-locking motor (11), a hanging rope (13) extends from the bottom of the twisted roller (10), and the bottom of the hanging rope (13) is connected to a hook (7) through a connector (14); The walking wheel assembly (5) is slidably connected to the sliding rail (3), and the power wheel assembly (6) is in frictional contact with the side of the sliding rail (3); The power wheel assembly (6) includes a mounting plate (61) fixed to the bottom of the walking frame (4), a power wheel body (62) is rotatably connected to the bottom of the mounting plate (61), and a power box (63) is fixedly connected to the top of the mounting plate (61). The output end of the power box (63) is connected to the power wheel body (62) in a transmission connection. It also includes a braking mechanism for braking the power wheel assembly (6), the braking mechanism including a stop pawl assembly (8) and a stop pawl drive member (1), the stop pawl assembly (8) being rotatably connected to the bottom of the walking frame (4), the stop pawl drive member (1) being fixedly connected to the bottom of the walking frame (4), and the actuating end of the stop pawl drive member (1) being connected to the stop pawl assembly (8) in a transmission connection. The stop claw assembly (8) includes a connecting frame (81) fixedly connected to the walking frame (4). A brake arm (82) is rotatably connected to the bottom of the connecting frame (81). The inner side of the brake arm (82) is provided with an inner arc-shaped surface (83) that cooperates with the power wheel assembly (6). One end of the brake arm (82) is connected to an arc-shaped claw (85) through an elastic part (84). The inner side of the arc-shaped claw (85) has an arc-shaped surface that cooperates with the power wheel assembly (6). The end of the arc-shaped claw (85) is provided with a pressing surface (86) parallel to the side of the sliding track (3). The stop claw drive component (1) includes a horizontal column (101) and a connecting rod (104). Both ends of the horizontal column (101) are fixedly connected to the walking frame (4). A connecting seat (102) is fixedly connected to one side of the horizontal column (101). A bidirectional hydraulic cylinder (103) is fixedly connected to the bottom of the connecting seat (102). One end of the connecting rod (104) is movably connected to the end of the bidirectional hydraulic cylinder (103). The other end of the connecting rod (104) is movably connected to the brake arm (82). The elastic part (84) adopts a bent plate structure, and the elastic part (84) can stretch or shorten by its own deformation; During braking, the bidirectional hydraulic cylinder (103) drives the brake arm (82) to rotate inward through the connecting rod (104), so that the inner arc surface (83) of the brake arm (82) cooperates with the outer surface of the power wheel body (62) to achieve braking of the power wheel assembly (6); When the braking signal is issued, if the brake arm (82) fails to brake the power wheel (62) within a short distance, the power wheel (62) carrying the arc-shaped claw (85) moves to the gap between the power wheel (62) and the side of the sliding track (3), so that the pressing surface (86) at the end of the arc-shaped claw (85) and the sliding track (3) generate a pressing force, and the pressing force increases as the power wheel (62) continues to rotate, so as to lock and fix the walking frame (4).

2. The lifting assembly for a crane according to claim 1, characterized in that: The top of the sliding track (3) is provided with a sliding groove (31), and both the left and right sides of the sliding groove (31) are provided with stepped portions (32). An inclined portion (33) is provided at the top side of the sliding groove (31).

3. The lifting assembly for a crane according to claim 2, characterized in that: The walking wheel assembly (5) includes a sliding frame (51), the top of the sliding frame (51) is provided with a long slot (52), and both ends of the walking frame (4) are provided with crossbeams. The sliding frame (51) is slidably connected to the crossbeams, and the top of the crossbeams is provided with positioning screws. The positioning screws pass through the long slot (52) and are threadedly connected to the top of the crossbeams. The bottom of the sliding frame (51) is fixedly connected to a support plate (53), and the bottom of the support plate (53) is fixedly connected to two sets of parallel side plate frames (54). The inner side of the side plate frame (54) is movably connected to a roller body (56) through a roller mounting component (55). The outer side of the side plate frame (54) is fixedly connected to a positioning plate (57), and the bottom of the positioning plate (57) is provided with a guide slope (58) corresponding to the inclined part (33).

4. The lifting assembly for a crane according to claim 1, characterized in that: The connector (14) includes two sets of parallel limiting frames (143). The inner side of the limiting frame (143) is rotatably connected to a large wheel (141) and a small wheel (142). The large wheel (141) is connected to the lifting rope (13), and the small wheel (142) is connected to the locking rope at the top of the hook (7).

5. The lifting assembly for a crane according to claim 1, characterized in that: The power wheel assembly (6) is provided in four sets, distributed at the four corners of the walking frame (4). The stop pawl assembly (8) is provided in four sets, corresponding one-to-one with the power wheel assembly (6). The stop pawl drive member (1) is provided in two sets, one set of which controls the two stop pawl assemblies (8) located on the same side to move.

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