An outrigger for a crane

Abstract

The utility model discloses a crane is with the overhanging support belongs to crane support technical field, in the utility model, including crane main part, both sides of crane main part are all installed fixedly with the accommodation seat, two overhanging supports are slidably arranged in the accommodation seat, the mounting bracket is slidably arranged in the overhanging support, and the lifting frame is arranged on the mounting bracket, the hollow support is rotatably connected on the lifting frame, the transmission mechanism is rotatably connected on the lifting frame, the adjustable seat is slidably arranged in the hollow support, the folding and unfolding mechanism is rotatably connected to the hollow support upper end inner wall, through setting hollow support and transmission mechanism, when the hollow support of bottom opening is supported on the soft ground and moves down, will make the hollow support autorotation, and the hollow support can effectively insert the soft ground through autorotation, like this can increase the contact area with the ground, and improve the supporting force, and autorotation makes the support can be more evenly distributed load, avoids local subsidence or support inclination.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of crane support, and particularly relates to an outrigger for a crane. BACKGROUND

[0002] A crane is a heavy machinery widely used in construction, port, logistics, manufacturing and other industries, mainly used for lifting, moving and placing heavy objects. It plays an important role in the construction site, warehouse or production line by changing its support and lifting mode. The outrigger of the crane usually refers to the support structure that extends outward to increase stability and working range. Its main function is to provide additional support force to prevent the crane from tilting or losing stability during operation, especially when lifting heavy objects or performing long-arm operations, the outrigger is particularly important.

[0003] Some invention patents in the technical field of crane support are disclosed in the prior art, one of which is an invention patent with application number CN202310251042.1, which discloses a crane anti-rollover support. When the center of gravity of the crane tilts to one side, the two support outer legs on the side of the center of gravity will also be concave into the ground. In order to avoid the crane from tilting too much during adjustment of the center of gravity, causing the center of gravity to be unable to be adjusted, the auxiliary anti-rollover device on the two support outer legs on the tilting side is controlled to work. First, the support outer leg is controlled to continue to descend by the hydraulic rod, until the toothed slot rod in the support outer leg is lowered to engage with the auxiliary gear and drive it to rotate clockwise. Under the transmission cooperation of the fourth, fifth and sixth sprockets, the third and fourth chains, the groove steel frame is rotated towards the support outer leg, reducing the distance between it and the ground. At the same time, under the transmission cooperation of the fifth, sixth and seventh sprockets, one of the cooperating gears rotates clockwise, thereby driving the rotating shaft with the other cooperating gear to rotate counterclockwise, thereby driving the anti-rollover leg to rotate counterclockwise with the end of the groove steel frame as the axis, accelerating its rapid contact with the ground and inserting into the ground, and the groove steel frame and the anti-rollover leg tend to be in a straight line, thereby achieving the effect of quickly supporting the side of the crane that sinks into the ground to more stably and quickly adjust the center of gravity of the crane by the counterweight.

[0004] The prior art uses a support leg to support, which is suitable for hard ground, but when supporting on soft ground, the support outer leg cannot effectively disperse the weight of the crane due to the deformation of the ground, resulting in a decrease in support effect.

[0005] Based on this, the present application designs an outrigger for a crane to solve the above problems. SUMMARY

[0006] The present application aims at solving the problem of the decline of the supporting effect caused by the fact that the supporting outer leg cannot effectively disperse the weight of the crane due to the easy deformation of the ground when supporting the soft ground.

[0007] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0008] A crane outer support, comprising a crane main body, both sides of the crane main body are provided with a receiving seat, two outer supports are slidingly arranged in the receiving seat, an installation frame is slidingly arranged in the outer support, a lifting frame is arranged on the installation frame, a hollow support is rotatably arranged on the lifting frame, a rotating column is fixedly arranged at the top of the hollow support, the rotating column is rotatably connected with the lifting frame, a gear A is fixedly arranged on the rotating column, a transmission mechanism is rotatably arranged on the lifting frame, the transmission mechanism comprises a universal joint A, the universal joint A is rotatably connected with the lifting frame, a transmission wheel A is fixedly arranged at the top of the universal joint A, a sleeve rod A is fixedly arranged at the bottom of the universal joint A, a sliding sleeve A is slidingly arranged on the outer wall of the sleeve rod A, the sliding sleeve A is slidingly arranged through the lifting frame, a gear B is fixedly arranged on the sliding sleeve A, the gear B is in meshing transmission with the gear A, an adjustable seat is slidingly arranged in the hollow support, a folding and unfolding mechanism is rotatably arranged on the inner wall of the upper end of the hollow support, and a plurality of auxiliary supporting legs are rotatably arranged in the annular structure on the outer side of the hollow support.

[0009] Further description of the above technical scheme:

[0010] A motor is fixedly arranged on the outer wall of the bottom end of the receiving seat, the output end of the motor extends to the inner wall of the receiving seat and is fixedly connected with a driving wheel, a driven wheel is in meshing transmission on the upper side of the driving wheel, a bidirectional screw rod is fixedly arranged through the driven wheel, and the outer walls of the two ends of the bidirectional screw rod are threadedly connected with the outer support.

[0011] Further description of the above technical scheme:

[0012] A hydraulic rod is fixedly arranged on the inner wall of the outer support, and the output end of the hydraulic rod is fixedly connected with the installation frame.

[0013] Further description of the above technical scheme:

[0014] Fixed racks A and B are respectively fixedly arranged on the top end and the side wall of the installation frame.

[0015] Further description of the above technical scheme:

[0016] The lifting frame is fixedly connected with a hydraulic cylinder, and the hydraulic cylinder is fixedly connected with the mounting frame.

[0017] As a further description of the above technical solution:

[0018] The transmission wheel A is in meshing transmission with the fixed rack A, the sliding sleeve A is rotationally connected with an adjusting ring, a plurality of tension springs are fixedly connected on the adjusting ring, and the other ends of the tension springs are fixedly connected with the inner wall of the lifting frame.

[0019] As a further description of the above technical solution:

[0020] The adjustable seat is rotationally connected with a push rod set, the top end of the push rod set is rotationally connected with the inner wall of the hollow support, a gear C is fixedly connected with the top end of the push rod set, an adjusting rack is in meshing transmission on one side of the gear C, an electric push rod is fixedly connected at one end of the adjusting rack, and the other end of the electric push rod is rotationally connected with the inner wall of the hollow support.

[0021] As a further description of the above technical solution:

[0022] The adjustable seat is fixedly connected with a top rod A and a top rod B respectively, a ball is embedded at the top end of each of the top rod A and the top rod B, the top rod A extends through the inner wall of the hollow support to the outside, and the ball at the top end of the top rod A is in movable contact with the adjusting ring.

[0023] As a further description of the above technical solution:

[0024] The retractable mechanism comprises a universal joint B, the universal joint B is rotationally connected with the inner wall of the lifting frame, a transmission wheel B is fixedly connected with the top end of the universal joint B, the transmission wheel B is in meshing transmission with a fixed rack B, the universal joint B extends to the inside through the inner wall of the lifting frame and the outer wall of the hollow support in sequence, a sleeve rod B is fixedly connected with one end of the universal joint B in the hollow support, a sliding sleeve B is slidingly matched with the outer wall of the sleeve rod B, a drive wheel is fixedly connected with the outer wall of the sliding sleeve B, a spring is placed between the upper side of the drive wheel and the inner wall of the hollow support, the bottom end of the drive wheel is in sliding contact with the top end of a top rod B, an adjusting wheel is in movable meshing transmission on one side of the drive wheel, the adjusting wheel is provided with a transmission ring on one side, the transmission ring is rotationally connected with the inner wall of the hollow support, an annular rack A is fixedly connected at the inner circle of the transmission ring, the annular rack A is in meshing transmission with the adjusting wheel, and an annular rack B is fixedly connected at the outer circle of the transmission ring.

[0025] As a further description of the above technical solution:

[0026] The bottom end of the auxiliary supporting leg is rotationally connected to the inner wall of the hollow support through a pin shaft, a worm gear is fixedly connected to the middle part of the bottom end of the auxiliary supporting leg, the worm gear is meshingly and transmissionally connected to a worm on one side, the worm is rotationally connected to the inner wall of the hollow support, and a retractable gear is fixedly connected to the top end of the worm, and the retractable gear is meshingly and transmissionally connected to a ring gear B.

[0027] In summary, due to the adoption of the above technical solutions, the present application has the following advantages:

[0028] 1、In the present application, by setting the hollow support and the transmission mechanism, when the bottom opening hollow support is moved down to support on the soft ground, it will rotate under the drive of the transmission mechanism, and the hollow support can effectively penetrate into the soft ground through rotation, which can increase the contact area with the ground and improve the supporting force. Rotation enables the support to more evenly distribute the load, avoiding local subsidence or tilting of the support. Through the rotation of the hollow support, the resistance when contacting the ground can be reduced, especially on soft ground. Rotation can help the support to smoothly penetrate the soft soil layer, reduce friction during insertion, thereby improving the insertion efficiency and shortening the support installation time, which can greatly improve the stability, supporting force and operation efficiency of the crane on soft ground, overcoming the shortcomings of traditional support systems on soft soil.

[0029] 2、In the present application, by setting the adjustable seat, the bottom opening of the hollow support can be sealed when the adjustable seat is moved down, thereby increasing the contact area of the hollow support with the hard ground and improving the supporting stability and carrying capacity. When the adjustable seat is moved up, the bottom opening of the hollow support is opened, which can easily penetrate into the soft ground. Through this design, the hollow support can be flexibly switched between hard ground and soft ground, enhancing the adaptability and use range of the support. When the adjustable seat is moved down, the dirt and other debris inside the hollow support can be pushed out. This helps to avoid dirt accumulation, maintain the normal function of the hollow support, and ensure the efficiency of the support during use, especially when operating on soft ground, the support system can remain clean and unobstructed.

[0030] 3、In the present application, by setting the retracting mechanism and the auxiliary supporting leg, when the hollow support is supported on the hard ground, the auxiliary supporting leg can be automatically moved out of the hollow support under the action of the retracting mechanism, which can expand the supporting surface and provide additional supporting force. This enables the support to share a larger load and reduces the situation of excessive local stress, significantly improving the stability and safety of the support, especially when bearing heavy load, the retracting mechanism can automatically expand or retract the auxiliary supporting leg, greatly reducing manual intervention and making operation simple and efficient. This is particularly useful for situations that require frequent adjustment or switching of the support state, which can improve work efficiency and reduce installation and adjustment time. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A schematic diagram of the overall structure of an outrigger for a crane according to the present application;

[0032] Figure 2 A schematic diagram of the overall structure of an outrigger for a crane according to the present application;

[0033] Figure 3 A schematic diagram of the overall structure of an outrigger for a crane according to the present application;

[0034] Figure 4 A schematic diagram of the overall structure of an outrigger for a crane according to the present application;

[0035] Figure 5 A schematic diagram of the overall structure of an outrigger for a crane according to the present application;

[0036] Figure 6 A schematic diagram of the overall structure of an outrigger for a crane according to the present application;

[0037] Figure 7 A schematic diagram of the overall structure of an outrigger for a crane according to the present application;

[0038] Figure 8 A schematic diagram of the overall structure of an outrigger for a crane according to the present application;

[0039] Figure 9 A schematic diagram of the overall structure of an outrigger for a crane according to the present application;

[0040] Legend:

[0041] 1, crane main body; 2, storage seat; 3, outrigger; 4, mounting frame; 5, lifting frame; 6, hollow support; 7, transmission mechanism; 8, adjustable seat; 9, folding mechanism; 10, auxiliary foot; 201, motor; 202, driving wheel; 203, driven wheel; 204, bidirectional screw; 301, hydraulic rod; 401, fixed rack A; 402, fixed rack B; 501, hydraulic cylinder; 601, gear A; 602, rotating column; 701, universal joint A; 702, transmission wheel A; 703, gear B; 704, adjusting ring; 705, tension spring; 706, sleeve rod A; 707, sliding sleeve A; 801, push rod group; 802, electric push rod; 803, ejector pin A; 804, ejector pin B; 805, ball; 806, gear C; 807, adjusting rack; 901, universal joint B; 902, transmission wheel B; 903, driving wheel; 904, spring; 905, adjusting wheel; 906, transmission ring; 907, ring rack A; 908, ring rack B; 909, sleeve rod B; 910, sliding sleeve B; 1001, worm wheel; 1002, worm; 1003, folding gear. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0043] Please refer to the drawings in the embodiments of the present application Figure 1 - the drawings in the embodiments of the present application Figure 9The application provides a technical scheme: a crane outrigger, comprising a crane body 1, a receiving seat 2 is fixedly arranged on both sides of the crane body 1, two outriggers 3 are slidingly arranged in the receiving seat 2, a mounting rack 4 is slidingly arranged in the outrigger 3, a lifting frame 5 is arranged on the mounting rack 4, a hollow support 6 is rotatably arranged on the lifting frame 5, a rotating column 602 is fixedly arranged at the top of the hollow support 6 and is rotatably connected with the lifting frame 5, a gear A 601 is fixedly arranged on the rotating column 602, a transmission mechanism 7 is rotatably arranged on the lifting frame 5 and comprises a universal joint A 701, the universal joint A 701 is rotatably arranged on the lifting frame 5, a transmission wheel A 702 is fixedly arranged at the top of the universal joint A 701, a sleeve rod A 706 is fixedly arranged at the bottom of the universal joint A 701, a sliding sleeve A 707 is slidingly arranged on the outer wall of the sleeve rod A 706 and is slidingly arranged in the lifting frame 5, a gear B 703 is fixedly arranged on the sliding sleeve A 707 and is in meshing transmission with the gear A 601, an adjustable seat 8 is slidingly arranged in the hollow support 6, a folding mechanism 9 is rotatably arranged on the inner wall of the upper end of the hollow support 6, and a plurality of auxiliary supporting legs 10 are rotatably arranged on the outer side of the hollow support 6 in a ring structure.

[0044] When the hollow support 6 with an open bottom is supported on soft ground and is driven by the transmission mechanism 7, the hollow support 6 can rotate and effectively penetrate the soft ground, thereby increasing the contact area with the ground and improving the supporting force. The rotation of the hollow support 6 can more evenly distribute the load and avoid local subsidence or tilting. The rotation of the hollow support 6 can reduce the resistance when contacting the ground, especially on soft ground. The rotation can help the hollow support 6 smoothly penetrate the soft soil layer, reduce friction during insertion, improve insertion efficiency, shorten the supporting and installation time, and greatly improve the stability, supporting force and work efficiency of the crane on soft ground, overcoming the shortcomings of traditional support systems on soft soil.

[0045] Specifically, as Figure 3As shown, the bottom end of the outer wall of the storage seat 2 is fixedly connected with a motor 201, the output end of the motor 201 extends to the inner wall of the storage seat 2 and is fixedly connected with a driving wheel 202, the upper side of the driving wheel 202 is engaged with a driven wheel 203 in transmission, the driven wheel 203 is fixedly connected with a bidirectional screw rod 204, and the outer walls of the two ends of the bidirectional screw rod 204 are threadedly connected with the outer extension support 3. The motor 201 drives the connected driving wheel 202 to rotate, so that the driving wheel 202 drives the driven wheel 203 to rotate, and at this time the driven wheel 203 drives the connected bidirectional screw rod 204 to rotate, so that the bidirectional screw rod 204 can drive the outer extension support 3 at both ends to move out of the storage seat 2, and at the same time the hydraulic rod 301 drives the mounting frame 4 to further move out.

[0046] Specifically, as shown in the figure, Figure 4 The inner wall of the outer extension support 3 is fixedly connected with a hydraulic rod 301, and the output end of the hydraulic rod 301 is fixedly connected with the mounting frame 4.

[0047] Specifically, as shown in the figure, Figure 4 The top end and the side wall of the mounting frame 4 are fixedly connected with a fixed rack A 401 and a fixed rack B 402, respectively.

[0048] Specifically, as shown in the figure, Figure 5 The upper part of the lifting frame 5 is fixedly connected with a hydraulic cylinder 501, and the hydraulic cylinder 501 is fixedly connected with the mounting frame 4.

[0049] Specifically, as shown in the figure, Figure 6 The transmission wheel A 702 is engaged with the fixed rack A 401 in transmission, the sliding sleeve A 707 is rotatably connected with an adjusting ring 704, a plurality of tension springs 705 are fixedly connected to the adjusting ring 704, and the other ends of the tension springs 705 are fixedly connected to the inner wall of the lifting frame 5. The adjusting ring 704 is not limited by the top rod A 803 and will drive the connected adjusting ring 704 to move down under the action of the tension spring 705.

[0050] Specifically, as shown in the figure, Figure 7 The top end of the push rod group 801 is rotatably connected with the inner wall of the hollow support 6, the top end of the push rod group 801 is fixedly connected with a gear C 806, one side of the gear C 806 is engaged with an adjusting rack 807 in transmission, one end of the adjusting rack 807 is fixedly connected with an electric push rod 802, and the other end of the electric push rod 802 is rotatably connected with the inner wall of the hollow support 6. The electric push rod 802 drives the connected adjusting rack 807 to move, so that the adjusting rack 807 drives the gear C 806 connected with the push rod group 801 to rotate, so that the push rod group 801 can drive the adjustable seat 8 to move down.

[0051] The adjustable seat 8 is fixedly connected with a top rod A 803 and a top rod B 804, respectively. The top ends of the top rod A 803 and the top rod B 804 are embedded with a ball 805. The top rod A 803 extends through the inner wall of the hollow support 6 to the outside. The ball 805 at the top end of the top rod A 803 is in movable contact with the adjusting ring 704. The ball 805 can reduce friction.

[0052] Specifically, as shown in Figure 8 The mechanism 9 includes a universal joint B 901. The universal joint B 901 is rotatably connected with the inner wall of the lifting frame 5. The top end of the universal joint B 901 is fixedly connected with a transmission wheel B 902. The transmission wheel B 902 is in meshing transmission with the fixed rack B 402. The bottom end of the universal joint B 901 extends through the inner wall of the lifting frame 5 and the outer wall of the hollow support 6 to the inside. One end of the universal joint B 901 in the hollow support 6 is fixedly connected with a sleeve rod B 909. The outer wall of the sleeve rod B 909 is slidably connected with a sliding sleeve B 910. The outer wall of the sliding sleeve B 910 is fixedly connected with a drive wheel 903. The upper side of the drive wheel 903 and the inner wall of the hollow support 6 are provided with a spring 904. The bottom end of the drive wheel 903 is in sliding contact with the top end of the top rod B 804. One side of the drive wheel 903 is in movable meshing transmission with an adjusting wheel 905. One side of the adjusting wheel 905 is provided with a transmission ring 906. The transmission ring 906 is rotatably connected with the inner wall of the hollow support 6. The inner circle of the transmission ring 906 is fixedly connected with an annular rack A 907. The annular rack A 907 is in meshing transmission with the adjusting wheel 905. The outer circle of the transmission ring 906 is fixedly connected with an annular rack B 908. Under the action of the fixed rack B 402, the transmission wheel B 902 connected therewith rotates, which drives the universal joint B 901 connected therewith to rotate. At this time, the universal joint B 901 drives the sleeve rod B 909 connected therewith to rotate, which drives the sliding sleeve B 910 connected with the sleeve rod B 909 to rotate. Then, the drive wheel 903 drives the adjusting wheel 905 to rotate, which drives the transmission ring 906 to rotate through the adjusting wheel 905.

[0053] Specifically, as shown in Figure 9 The bottom end of the auxiliary supporting leg 10 is rotatably connected with the inner wall of the hollow support 6 through a pin shaft. The bottom end of the auxiliary supporting leg 10 is fixedly connected with a worm gear 1001. One side of the worm gear 1001 is in meshing transmission with a worm 1002. The worm 1002 is rotatably connected with the inner wall of the hollow support 6. The top end of the worm 1002 is fixedly connected with a retracting gear 1003. The retracting gear 1003 is in meshing transmission with the annular rack B 908. The transmission ring 906 drives the retracting gear 1003 to rotate through the annular rack B 908 on the outside, which drives the worm 1002 connected therewith to rotate, and drives the auxiliary supporting leg 10 connected with the worm gear 1001 to rotate and flatten.

[0054] Working principle, use time: when the crane main body 1 needs to be supported, use the motor 201 to drive the connected driving wheel 202 to rotate, so that the driving wheel 202 drives the driven wheel 203 to rotate, at this time the driven wheel 203 drives the connected bidirectional screw rod 204 to rotate, so that the bidirectional screw rod 204 can drive the outer extension support 3 at both ends to move out of the storage seat 2, and at the same time the hydraulic rod 301 drives the mounting frame 4 to further move out;

[0055] Then according to the ground strength, when the ground hardness is higher, the electric push rod 802 drives the connected adjusting rack 807 to move, so that the adjusting rack 807 drives the push rod group 801 connected with the gear C 806 to rotate, so that the push rod group 801 can drive the adjustable seat 8 to move down and seal the opening of the hollow support 6, and at the same time after the adjustable seat 8 moves down, the top rod A 803 and the top rod B 804 connected with it will move down, at this time the adjusting ring 704 is not limited by the top rod A 803, and under the action of the tension spring 705 it will drive the connected adjusting ring 704 to move down, so that the adjusting ring 704 drives the gear B 703 on the sliding sleeve A 707 to move down and not mesh with the gear A 601, so that when the hollow support 6 moves down and supports on the hard ground, it will not drive the hollow support 6 to rotate;

[0056] At the same time after the top rod B 804 moves down, the drive wheel 903 in contact with the top rod B 804 will move down and mesh with the adjusting wheel 905 under the action of the spring 904, and then when the lifting frame 5 is driven by the hydraulic cylinder 501 to move down, under the action of the fixed rack B 402, the transmission wheel B 902 meshing with it will rotate, so that the transmission wheel B 902 drives the connected universal joint B 901 to rotate, at this time the universal joint B 901 will drive the connected sleeve rod B 909 to rotate, so that the sleeve rod B 909 can drive the sliding sleeve B 910 connected with the drive wheel 903 to rotate, and then the drive wheel 903 will drive the adjusting wheel 905 to rotate, and the adjusting wheel 905 can mesh with the ring gear A 907 to rotate, so as to drive the transmission ring 906 to rotate;

[0057] At this time the transmission ring 906 will drive the retractable gear 1003 to rotate through the outer ring gear B 908, so that the retractable gear 1003 can drive the connected worm 1002 to rotate, so that the worm 1002 can drive the auxiliary supporting leg 10 connected with the worm gear 1001 to rotate and flatten, thereby improving the supporting range of the hollow support 6;

[0058] When the ground supported by the hollow support 6 is soft, first retract the adjustable seat 8, at this time the top rod A 803 on the adjustable seat 8 will make the gear B 703 move up and mesh with the gear A 601, and the top rod B 804 will make the drive wheel 903 move up and not mesh with the adjusting wheel 905, so that when the hollow support 6 is inserted into the soft ground, the auxiliary supporting leg 10 will not be lowered.

[0059] At this time, when the lifting frame 5 is driven to move downward by the hydraulic cylinder 501, the transmission wheel A702 engaged with the fixed rack A401 will rotate under the action of the fixed rack A401, so that the transmission wheel A702 can drive the connected universal joint A701 to rotate, so that the universal joint A701 can drive the connected sleeve rod A706 to rotate. At this time, the sleeve rod A706 will drive the gear B703 connected with the sliding sleeve A707 to rotate, so that the gear B703 can drive the rotating column 602 connected with the gear A601 to rotate, thereby driving the connected hollow support 6 to rotate, so that it can be inserted into the ground, improving the stability of the hollow support 6.

[0060] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes within the technical range disclosed by the present application according to the technical solution and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. An external support for a crane, comprising a crane body, characterized in that, The crane body has storage seats fixedly installed on both sides. Two outward-extending brackets are slidably fitted within each storage seat. A mounting frame is slidably fitted within each outward-extending bracket. A lifting frame is mounted on each mounting frame. A hollow support is rotatably connected to the lifting frame. A rotating column is fixedly connected to the top of the hollow support. The rotating column is rotatably connected to the lifting frame. A gear A is fixedly connected to the rotating column. A transmission mechanism is rotatably connected to the lifting frame. The transmission mechanism includes a universal joint A, which is rotatably connected to the lifting frame. A transmission wheel A is fixedly connected to the top of the universal joint A. A sleeve rod A is fixedly connected to the bottom of the universal joint A. A sliding sleeve A is slidably fitted onto the outer wall of the sleeve rod A. The sliding sleeve A is slidably connected to the lifting frame. A gear B is fixedly connected to the sliding sleeve A, and gear B meshes with gear A for transmission. An adjustable seat is slidably connected inside the hollow support. A retraction mechanism is rotatably connected to the upper inner wall of the hollow support. Multiple auxiliary support legs are rotatably connected to the outer side of the hollow support in a ring structure. A fixed rack A and a fixed rack B are fixedly connected to the top and side walls of the mounting frame, respectively. The transmission wheel A meshes with the fixed rack A for transmission. An adjusting ring is rotatably connected to the sliding sleeve A. Multiple tension springs are fixedly connected to the adjusting ring, and the other end of each tension spring is fixedly connected to the inner wall of the lifting frame. A push rod assembly is rotatably connected to the adjustable seat. The top of the push rod assembly... The push rod assembly is rotatably connected to the inner wall of the hollow support. A gear C is fixedly connected to the top of the push rod assembly. An adjusting rack is meshed with one side of the gear C. An electric push rod is fixedly connected to one end of the adjusting rack. The other end of the electric push rod is rotatably connected to the inner wall of the hollow support. A push rod A and a push rod B are fixedly connected to the adjustable seat. Ball bearings are embedded at the top of both push rod A and push rod B. Push rod A extends through the inner wall of the hollow support to the outside. The ball bearing at the top of push rod A is in movable contact with the adjusting ring. The retraction mechanism includes a universal joint B, which is rotatably connected to the inner wall of the lifting frame. A transmission wheel B is fixedly connected to the top of universal joint B, and the transmission wheel B meshes with the fixed rack B. The bottom end of universal joint B extends through the inner wall of the lifting frame and the outer wall of the hollow support to the interior. A sleeve rod B is fixedly connected to one end of universal joint B inside the hollow support. A sliding sleeve B is slidably fitted onto the outer wall of sleeve rod B. A drive wheel is fixedly connected to the outer wall of sliding sleeve B. A spring is placed between the upper side of the drive wheel and the inner wall of the hollow support. The bottom end of the drive wheel is in slidable contact with the top end of the push rod B. An adjusting wheel is movably engaged with one side of the drive wheel. A transmission ring is provided on one side of the adjusting wheel. The transmission ring is rotatably connected to the inner wall of the hollow support. A ring rack A is fixedly connected to the inner circle of the transmission ring, and the ring rack A meshes with the adjusting wheel. A ring rack B is fixedly connected to the outer circle of the transmission ring.The bottom end of the auxiliary support leg is rotatably connected to the inner wall of the hollow support via a pin. A worm gear is fixedly connected to the middle of the bottom end of the auxiliary support leg. A worm is meshed with one side of the worm gear, and the worm is rotatably connected to the inner wall of the hollow support. A take-up and release gear is fixedly connected to the top of the worm, and the take-up and release gear meshes with a ring rack B.

2. The crane extension bracket according to claim 1, characterized in that, A motor is fixedly connected to the outer wall of the bottom end of the storage base. The output end of the motor extends to the inner wall of the storage base and is fixedly connected to a drive wheel. A driven wheel is meshed and driven on the upper side of the drive wheel. A bidirectional lead screw is fixedly connected through the driven wheel. The outer walls of both ends of the bidirectional lead screw are threadedly connected to the extension bracket.

3. The crane extension bracket according to claim 1, characterized in that, A hydraulic rod is fixedly connected to the inner wall of the extended bracket, and the output end of the hydraulic rod is fixedly connected to the mounting bracket.

4. The crane extension bracket according to claim 1, characterized in that, A hydraulic cylinder is fixedly connected to the lifting frame, and the hydraulic cylinder is fixedly connected to the mounting frame.

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