Rotary lifting appliance for crane

Abstract

The invention relates to the technical field of cranes, in particular to a rotary lifting appliance for a crane. Comprising a hanger, comprising a hanging bracket and further comprises a swing mechanism, the swing mechanism comprises a pair of movable sleeves and a pair of sliding frames which are arranged on the hanging bracket in a sliding and sleeving mode, compression springs are symmetrically arranged between the movable sleeves and the sliding frames, and swing sleeves movably connected with the inner walls of the movable sleeves are rotationally installed on the sliding frames in a penetrating mode. When goods are hoisted, the rotary mechanism can be adjusted according to the turning angle needed by the goods, when the goods need to be turned over by 90 degrees, a first electromagnet is controlled to generate repulsive force on a first magnetic plate, a clamping sleeve can be clamped into a first guide groove of a rotary sleeve, the inner wall of the first guide groove is extruded through the clamping sleeve, and the goods are turned over by 90 degrees. The rotating sleeve can be rotated by 90 degrees, then cargoes are rotated by 90 degrees, after the cargoes are hoisted to a designated position, the movable sleeve and the rotating sleeve can move synchronously through the locking mechanism, and the cargoes can be collided when rotating.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and in particular to a rotary spreader for cranes. Background Art

[0002] When transporting goods by crane, the angle of the goods can be changed by rotating the sling, for example, steel plates can be erected or flipped after being hoisted, to meet different construction needs and effectively improve work efficiency.

[0003] When using current rotating spreaders, the opening and closing and rotation of the spreader need to be driven by an independent drive source, which has high maintenance costs and a high failure rate. If the weight of the cargo is unbalanced, the cargo will cause a huge load on the drive source that drives the spreader to rotate during the lifting process. In severe cases, the drive source will be damaged, the angle of the cargo cannot be controlled, and the cargo cannot be unloaded smoothly. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a rotating spreader for a crane.

[0005] A rotating sling for a crane comprises a hanger and a slewing mechanism, the slewing mechanism comprising a pair of movable sleeves slidably mounted on the hanger and a pair of slide frames, compression springs are symmetrically arranged between the movable sleeves and the slide frames, a slewing sleeve movably connected to the inner wall of the movable sleeve is rotatably mounted on the slide frame, a special-shaped through-groove is provided on the movable sleeve, a first magnetic plate driven by a first electromagnet is slidably mounted in the special-shaped through-groove, and a clamping sleeve fixedly mounted on the first magnetic plate is slidably mounted, a first tension spring is arranged between the clamping sleeve and the special-shaped through-groove, a first guide groove matching the clamping sleeve is provided on the slewing sleeve, and a locking mechanism for making the two move synchronously is provided on the movable sleeve and the slide frame.

[0006] As an improvement to the above scheme, the rotating mechanism also includes a second electromagnet, a second magnetic plate driven by the second electromagnet is slidably installed in the special-shaped through-groove of the movable sleeve, and a clamping shaft fixedly installed on the second magnetic plate is slidably installed, a second tension spring is provided between the clamping shaft and the special-shaped through-groove, the clamping shaft slides through the clamping sleeve, a second guide groove matching the clamping shaft and connected to the first guide groove is provided on the rotating sleeve, a pair of hanging plates are slidably installed on the hanger, the hanging plates are fixedly connected to the sliding frame through a pair of support rods, a hanging claw is rotatably installed on the hanging plate, a transmission assembly for driving the hanging claw to rotate is installed on the sliding frame, and the transmission assembly is connected to the rotating sleeve and the hanging plate.

[0007] As an improvement to the above solution, both the first guide groove and the second guide groove are spiral structures.

[0008] As the improvement of the above-mentioned scheme, the control direction pin is slidably installed in the through slot of the movable sleeve, and a third guide groove matched with the control direction pin is formed in the rotating sleeve.

[0009] As the improvement of the above-mentioned scheme, the first top rod is slidably installed in the special-shaped through slot of the movable sleeve, the first top rod is fixedly installed on the clamping sleeve, the L-shaped plate is fixedly installed on the control direction pin, the third tension spring is arranged between the L-shaped plate and the movable sleeve, and the tooth-shaped plate matched with the first top rod is fixedly installed on the L-shaped plate.

[0010] As the improvement of the above-mentioned scheme, the second top rod is slidably installed in the special-shaped through slot of the movable sleeve, the second top rod is fixedly installed on the clamping shaft, and the second top rod is matched with the tooth-shaped plate.

[0011] As the improvement of the above-mentioned scheme, the locking mechanism comprises a driving assembly installed in the hanging bracket, the movable sleeve is connected with the driving assembly, the first locking rod is elastically hinged to the movable sleeve, and the clamping plate matched with the first locking rod is fixedly installed on the sliding frame.

[0012] As the improvement of the above-mentioned scheme, the locking mechanism further comprises the second locking rod elastically hinged to the movable sleeve, and the second locking rod is matched with the clamping plate.

[0013] As the improvement of the above-mentioned scheme, a pair of connecting rods are fixedly installed on the hanging bracket, and the first unlocking plate matched with the first locking rod is hinged to the connecting rod.

[0014] As the improvement of the above-mentioned scheme, the second unlocking plate matched with the second locking rod is hinged to the connecting rod.

[0015] The present application has the following advantages: 1. When the goods are hoisted, the rotating mechanism can be adjusted according to the angle of the goods to be turned over, when the goods need to be turned over by ninety degrees, the clamping sleeve is clamped into the first guide groove of the rotating sleeve by controlling the repulsive force of the first electromagnet on the first magnetic plate, the rotating sleeve is turned by ninety degrees by the clamping sleeve extruding the inner wall of the first guide groove, and then the goods are turned by ninety degrees, and after the goods are hoisted to the designated position, the movable sleeve and the rotating sleeve can be synchronously moved by the locking mechanism, and the goods can be turned over without bumping.

[0016] 2. When the goods need to be turned over by one hundred and eighty degrees, the rotating sleeve is turned by one hundred and eighty degrees by the clamping shaft extruding the inner wall of the second guide groove, and then the goods are turned by one hundred and eighty degrees, compared with the direct connection of the driving source and the lifting claw, the structure of the present application is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the rotary mechanism of the present invention; Figure 3 This is a schematic diagram of the installation of the first magnetic plate of the present invention; Figure 4 This is a schematic diagram of the installation of the ferrule of the present invention; Figure 5 Schematic diagram of the structure of the second guide groove of the present invention; Figure 6 This is a schematic diagram of the installation of the transmission assembly of the present invention; Figure 7 This is a schematic diagram of the installation of the control pin of the present invention; Figure 8 Schematic diagram of the structure of the locking mechanism of the present invention; Figure 9 Schematic diagram of the structure of the first locking rod of the present invention.

[0018] In the accompanying drawings: 1-hanging bracket, 201-movable sleeve, 202-sliding frame, 203-rotating sleeve, 204-first electromagnet, 205-first magnetic plate, 206-clamping sleeve, 207-first guide groove, 301-second electromagnet, 302-second magnetic plate, 303-clamping shaft, 304-second guide groove, 305-hanging plate, 306-hanging claw, 307-transmission assembly, 401-control pin, 402-third guide groove, 501-first push rod, 502-toothed plate, 601-second push rod, 701-driving assembly, 702-first locking rod, 703-clamping plate, 801-second locking rod, 901-connecting rod, 902-first unlocking plate, 1001-second unlocking plate. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings.

[0020] Example 1 A rotating spreader for a crane, such as Figure 1-Figure 3As shown, it includes a hanger 1 and a slewing mechanism. The slewing mechanism includes a pair of movable sleeves 201 and a pair of slide frames 202 that are slidably sleeved on the hanger 1 along the left and right directions. Compression springs are symmetrically arranged between the movable sleeves 201 and the slide frames 202. A slewing sleeve 203 that is movably connected to the inner wall of the movable sleeve 201 is rotatably installed on the slide frame 202. A special-shaped through-groove is opened on the movable sleeve 201. A first magnetic plate 205 driven by a first electromagnet 204 is slidably installed in the special-shaped through-groove, and is slidably installed. There is a clamping sleeve 206 fixedly mounted on the first magnetic plate 205. The first electromagnet 204 can control the first magnetic plate 205 to drive the clamping sleeve 206 to lift and slide. A first tension spring is arranged between the bottom end of the clamping sleeve 206 and the special-shaped through-groove. A first guide groove 207 matching the clamping sleeve 206 is provided on the rotary sleeve 203. When the clamping sleeve 206 is inserted into the first guide groove 207 and squeezes its inner wall, the rotary sleeve 203 can be rotated. The movable sleeve 201 and the slide frame 202 are provided with a locking mechanism for making the two move synchronously.

[0021] like Figure 4-Figure 6 As shown, the rotary mechanism also includes a second electromagnet 301, and a second magnetic plate 302 driven by the second electromagnet 301 is slidably installed in the special-shaped through-groove of the movable sleeve 201, and a clamping shaft 303 fixedly installed on the second magnetic plate 302 is slidably installed. The second electromagnet 301 can control the second magnetic plate 302 to drive the clamping shaft 303 to lift upward, and a second tension spring is provided between the bottom end of the clamping shaft 303 and the special-shaped through-groove. The clamping shaft 303 slides through the clamping sleeve 206, and a second guide groove 304 matching the clamping shaft 303 and connected to the first guide groove 207 is provided on the rotary sleeve 203. The first guide groove 207 and the second guide groove 304 are both spiral structures, and the depth of the second guide groove 304 is greater than that of the first guide groove 207. A pair of hanging plates 305 are slidably installed on the hanger 1. The top of the plate 305 is fixedly connected to the top of the slide 202 through a pair of support rods, and a hanging claw 306 is rotatably installed on the lower part of the side where the two hanging plates 305 are close to each other. A transmission assembly 307 for driving the hanging claw 306 to rotate is installed on the slide 202. The transmission assembly 307 consists of a first gear, a second gear, a first transmission shaft, a second transmission shaft and a bevel gear, wherein the first gear is fixedly sleeved on the outer wall of the rotating sleeve 203, the second gear is rotatably installed on the slide 202 and meshes with the first gear, one end of the first transmission shaft is fixedly mounted on the second gear, and the other end transmits through the hanging plate 305, the second transmission shaft is rotatably mounted on the hanging plate 305 and meshes with the first transmission shaft, and the bevel gear is fixedly mounted on the rotating shaft of the hanging claw 306 and meshes with the second transmission shaft.

[0022] Initially, the compression spring is in a released state. The flipping angle of the hoisted cargo is determined first. When the cargo needs to be flipped ninety degrees, the first electromagnet 204 is started. The first electromagnet 204 generates a repulsive force on the first magnetic plate 205. The first magnetic plate 205 is forced to drive the clamping sleeve 206 to lift and slide. The first tension spring is forced to extend. After the clamping sleeve 206 is lifted, the top end is stuck in the first guide groove 207. Then, the pair of movable sleeves 201 are controlled to slide close to each other. The movable sleeve 201 pushes the slide 202 to slide along the hanger 1 through the compression spring. The slide 202 drives the hanging plate 305 to move through the support rod. The hanging plate 305 drives the lifting claw 306 to move until both lifting claws 306 are in contact with the cargo. At this time, the pair of movable sleeves 201 are continued to be controlled to slide close to each other, and the hanger 1 is lifted by the crane. The hanger 1 drives the cargo to be lifted through the hanging plate 305 and the lifting claw 306. The cargo passes through the lifting claw 306. When the load is lifted, the two lifting claws 306 are in a state of being lifted and the load is prevented from falling off.

[0023] When the cargo needs to be turned over 180 degrees, the second electromagnet 301 is started, and the second electromagnet 301 generates a repulsive force on the second magnetic plate 302. The second magnetic plate 302 is forced to drive the card shaft 303 to lift and slide. The second tension spring is forced to extend. After the card shaft 303 is lifted, the top end is stuck in the second guide groove 304. Then, the pair of movable sleeves 201 are controlled to slide close to each other, so that the two hanging claws 306 are in contact with the cargo. Then, the pair of movable sleeves 201 are continued to be controlled to slide close to each other. The cargo applies a reaction force to the hanging plate 305 through the hanging claws 306. The hanging plate 305 is forced to slide through the support rod. The frame 202 stops sliding, and then the crane drives the hanger 1 to be lifted. The hanger 1 drives the cargo to be lifted through the hanging plate 305 and the lifting claw 306. The movable sleeve 201 drives the card shaft 303 to continue to move. Then the card shaft 303 slides to the corner of the second guide groove 304 and squeezes the second guide groove 304 to rotate the rotary sleeve 203, thereby causing the two lifting claws 306 to drive the cargo to flip over until the card shaft 303 slides to the end of the second guide groove 304. At this time, the cargo is flipped 180 degrees under the action of the two lifting claws 306, thereby completing the flipping of the cargo at two different angles.

[0024] like Figure 7 As shown, a control pin 401 is installed on the rear side of the movable sleeve 201 in a sliding manner along the front-to-back direction, and a third guide groove 402 matching the control pin 401 is provided on the rotating sleeve 203. Through the cooperation between the control pin 401 and the third guide groove 402, the rotating sleeve 203 can be prevented from rotating.

[0025] Initially, the control pin 401 is stuck in the third guide groove 402 of the rotary sleeve 203. When the goods only need to be hoisted and transported without turning over, the pair of movable sleeves 201 are directly controlled to slide close to each other, so that the two lifting claws 306 are in contact with the goods. Then the pair of movable sleeves 201 are controlled to slide close to each other. The goods exert a reaction force on the hanging plate 305 through the lifting claws 306. The hanging plate 305 is forced to stop sliding through the support rod, and then the crane drives the hanger 1 to be lifted. The cargo is lifted by the hanging plate 305 and the hanging claw 306, and the movable sleeve 201 drives the control pin 401 to continue to move. The control pin 401 slides along the third guide groove 402 of the rotating sleeve 203. The control pin 401 can limit the rotating sleeve 203 through the third guide groove 402, so that the rotating sleeve 203 cannot rotate, and then the hanging claw 306 cannot rotate, thereby preventing the cargo from driving the hanging claw 306 to rotate when the center of gravity of the cargo is biased forward or backward, thereby realizing the original angle lifting work of the cargo.

[0026] like Figure 7 As shown, a first push rod 501 is slidably installed in the special-shaped through groove of the movable sleeve 201 along the up and down directions, and the first push rod 501 is fixedly installed on the clamping sleeve 206. An L-shaped plate is fixedly installed at the rear end of the control pin 401, and a third tension spring is arranged between the L-shaped plate and the movable sleeve 201. The third tension spring is sleeved on the outer wall of the control pin 401, and a toothed plate 502 used in conjunction with the first push rod 501 is fixedly installed at the bottom of the L-shaped plate.

[0027] like Figure 7 As shown, a second push rod 601 is slidably installed in the special-shaped through groove of the movable sleeve 201 along the up and down directions. The second push rod 601 is fixedly installed on the clamping shaft 303. The second push rod 601 is used in conjunction with the toothed plate 502. When the second push rod 601 is lifted, the control pin 401 can be disengaged from the third guide groove 402.

[0028] When the goods need to be turned over, the card sleeve 206 or the card shaft 303 is lifted, and respectively drives the first push rod 501 and the second push rod 601 to be lifted upward. After the first push rod 501 or the second push rod 601 is lifted, it squeezes the toothed plate 502. The toothed plate 502 is forced to drive the control pin 401 to slide to the side away from the rotary sleeve 203. After sliding, the control pin 401 disengages from the third guide groove 402 and no longer limits the rotary sleeve 203 through the third guide groove 402. The rotary sleeve 203 can rotate, and then the above steps are repeated to realize the turning of the goods.

[0029] like Figure 8 and Figure 9 As shown, the locking mechanism includes a driving assembly 701 installed in the hanger 1, and the driving assembly 701 consists of a driving motor, a third gear, a bidirectional screw and a fourth gear, wherein the driving motor is installed on the hanger 1, the third gear is fixedly installed on the output shaft of the driving motor, the bidirectional screw is rotatably installed in the hanger 1, and passes through the slide 202 and the hanger plate 305, the movable sleeve 201 is threadedly connected to the bidirectional screw, the movable sleeve 201 is elastically hinged with a first locking rod 702, and the slide 202 is fixedly installed with a clamping plate 703 used in conjunction with the first locking rod 702.

[0030] like Figure 9 As shown, the locking mechanism also includes a second locking rod 801 elastically hinged on the movable sleeve 201. The second locking rod 801 is located at the rear side of the first locking rod 702 and is longer than the first locking rod 702. The second locking rod 801 is used in conjunction with the clamping plate 703.

[0031] like Figure 8 and Figure 9 As shown, a pair of connecting rods 901 are fixedly installed on the hanger 1, and a first unlocking plate 902 is hinged on the connecting rod 901 for use with the first locking rod 702. When the first unlocking plate 902 contacts the upper inclined surface of the first locking rod 702, the first locking rod 702 can be rotated.

[0032] like Figure 9 As shown, a second unlocking plate 1001 is hinged on the connecting rod 901 for use with the second locking rod 801. When the second unlocking plate 1001 contacts the upper inclined surface of the second locking rod 801, the second locking rod 801 can be rotated.

[0033] When the cargo needs to be hoisted, the output shaft of the driving motor in the control driving assembly 701 is rotated, and the output shaft of the driving motor drives the third gear to rotate, and the third gear drives the bidirectional lead screw to rotate through the fourth gear. Under the action of the bidirectional lead screw, a pair of movable sleeves 201 slide close to each other along the hanger 1, and drive the first locking rod 702 and the second locking rod 801 thereon to move, and then the second locking rod 801 contacts the second unlocking plate 1001 and pushes the second unlocking plate 1001 to rotate upward, and the second locking rod 801 continues to move and passes over the second unlocking plate 1001, and the second unlocking plate 1001 rotates and resets, and when the lifting claw 306 When the cargo is in contact with the slide frame 202 and the slide frame 202 stops sliding, the pair of movable sleeves 201 continue to slide close to each other under the action of the two-way screw. When the cargo needs to be turned over 90 degrees, the movable sleeve 201 drives the second locking rod 801 to move to contact with the card plate 703. The edge of the card plate 703 presses the lower inclined surface of the second locking rod 801, and the second locking rod 801 elastically shrinks and rotates under the force. Then the second locking rod 801 contacts the top surface of the card plate 703 until the lower inclined surface of the second locking rod 801 passes over the top surface of the card plate 703. The second locking rod 801 is elastically released and rotated to buckle on the card plate 703, and then controls the drive assembly 701. The output shaft of the driving motor stops rotating until the cargo is hoisted to the specified position, and then the output shaft of the driving motor in the driving assembly 701 is controlled to rotate in the opposite direction, thereby causing the bidirectional screw to rotate in the opposite direction. A pair of movable sleeves 201 slide away from each other under the action of the bidirectional screw, and the movable sleeve 201 cooperates with the second locking rod 801 and the card plate 703 to make the slide frame 202 slide synchronously with the movable sleeve 201. The slide frame 202 drives the lifting claw 306 to move synchronously with the movable sleeve 201 through the support rod and the hanging plate 305. The lifting claw 306 is away from the cargo and does not rotate, thereby keeping the cargo in the flipped state. A pair of movable sleeves 20 1 continue to slide away from each other under the action of the bidirectional lead screw, and then the upper inclined surface of the second locking rod 801 contacts the second unlocking plate 1001. The second unlocking plate 1001 presses the upper inclined surface of the second locking rod 801, and the second locking rod 801 elastically contracts and rotates under the force and disengages from the clamping plate 703. The compression spring is released to drive the slide frame 202 away from the movable sleeve 201, and the slide frame 202 drives the rotary sleeve 203 to move. The first guide groove 207 of the rotary sleeve 203, under the action of the clamping sleeve 206, causes the rotary sleeve 203 to rotate and reset. The rotary sleeve 203 drives the second gear to rotate through the first gear, thereby causing the hanging claw 306 to rotate and reset.

[0034] When the cargo needs to be turned over 180 degrees, the above steps are repeated to release the second locking rod 801 elastically and rotate to buckle on the card plate 703. The output shaft of the driving motor in the driving assembly 701 continues to rotate. Then the first locking rod 702 contacts the first unlocking plate 902 and pushes the first unlocking plate 902 to rotate upward. The first locking rod 702 continues to move and passes over the first unlocking plate 902. The first unlocking plate 902 rotates and resets. Then the lower inclined surface of the first locking rod 702 contacts the top surface of the card plate 703, and the edge of the card plate 703 is locked. The edge presses the lower inclined surface of the first locking rod 702, and the first locking rod 702 elastically contracts and rotates under the force, and then the first locking rod 702 contacts the top surface of the card plate 703 until the inclined surface of the first locking rod 702 passes over the top surface of the card plate 703. The first locking rod 702 elastically releases and rotates to buckle on the card plate 703, and then controls the output shaft of the driving motor in the driving component 701 to stop rotating until the cargo is hoisted to the specified position, and then controls the output shaft of the driving motor in the driving component 701 to rotate in the opposite direction, thereby causing the bidirectional screw to rotate in the opposite direction. , a pair of movable sleeves 201 slide away from each other under the action of the bidirectional screw, and the movable sleeve 201 cooperates with the first locking rod 702 and the card plate 703 to make the slide frame 202 slide synchronously with the movable sleeve 201, and the slide frame 202 drives the lifting claw 306 to move synchronously with the movable sleeve 201 through the support rod and the hanging plate 305. The lifting claw 306 is away from the goods and does not rotate, thereby enabling the goods to remain in the state after flipping, and the pair of movable sleeves 201 continue to slide away from each other under the action of the bidirectional screw until the first locking rod 7 The upper inclined surface of 02 contacts the first unlocking plate 902, and the first unlocking plate 902 squeezes the upper inclined surface of the first locking rod 702. The first locking rod 702 elastically shrinks and rotates under the force and disengages from the card plate 703. The compression spring is released to drive the slide frame 202 away from the movable sleeve 201. Then the second locking rod 801 contacts the card plate 703, thereby limiting the lifting claw 306. At this time, the lifting claw 306 has reversed ninety degrees until the upper inclined surface of the second locking rod 801 contacts the second unlocking plate 1001, thereby causing the lifting claw 306 to rotate and reset.

[0035] Through the above steps, when the lifting claw 306 releases the cargo, the lifting claw 306 can be prevented from rotating, preventing the lifting claw 306 from rotating too early and causing the cargo to collide with the rotation, thereby completing the lifting and turning of the cargo.

[0036] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A rotary spreader for a crane, comprising a hanger (1), characterized in that: The invention also includes a rotary mechanism, which includes a pair of movable sleeves (201) and a pair of slide frames (202) which are slidably mounted on the hanger (1), a compression spring is symmetrically arranged between the movable sleeve (201) and the slide frame (202), a rotary sleeve (203) which is rotatably mounted on the slide frame (202) and is movably connected to the inner wall of the movable sleeve (201), a special-shaped through-groove is provided on the movable sleeve (201), a first magnetic plate (205) driven by a first electromagnet (204) is slidably mounted in the special-shaped through-groove, and a clamping sleeve (206) fixedly mounted on the first magnetic plate (205) is slidably mounted, a first tension spring is arranged between the clamping sleeve (206) and the special-shaped through-groove, a first guide groove (207) which matches the clamping sleeve (206) is provided on the rotary sleeve (203), and a locking mechanism for making the two move synchronously is provided on the movable sleeve (201) and the slide frame (202).

2. A rotary spreader for a crane according to claim 1, characterized in that: The rotary mechanism also includes a second electromagnet (301), a second magnetic plate (302) driven by the second electromagnet (301) is slidably installed in the special-shaped through-groove of the movable sleeve (201), and a clamping shaft (303) fixedly installed on the second magnetic plate (302) is slidably installed, a second tension spring is provided between the clamping shaft (303) and the special-shaped through-groove, the clamping shaft (303) slides through the clamping sleeve (206), and a spring is provided on the rotary sleeve (203) to match the clamping shaft (303) and to engage with the clamping shaft (303). The first guide groove (207) is connected to the second guide groove (304), a pair of hanging plates (305) are slidably installed on the hanger (1), the hanging plates (305) are fixedly connected to the slide frame (202) through a pair of support rods, a hanging claw (306) is rotatably installed on the hanging plate (305), a transmission assembly (307) for driving the hanging claw (306) to rotate is installed on the slide frame (202), and the transmission assembly (307) is connected to the rotary sleeve (203) and the hanging plate (305).

3. The rotary spreader for a crane according to claim 2, characterized in that: The first guide groove (207) and the second guide groove (304) are both spiral structures.

4. The rotary spreader for a crane according to claim 2, characterized in that: A control pin (401) is slidably mounted on the movable sleeve (201), and a third guide groove (402) matching the control pin (401) is provided on the rotary sleeve (203).

5. The rotary spreader for a crane according to claim 4, characterized in that: A first push rod (501) is slidably mounted in the special-shaped through groove of the movable sleeve (201), the first push rod (501) is fixedly mounted on the clamping sleeve (206), an L-shaped plate is fixedly mounted on the control pin (401), a third tension spring is provided between the L-shaped plate and the movable sleeve (201), and a toothed plate (502) used in conjunction with the first push rod (501) is fixedly mounted on the L-shaped plate.

6. The rotary spreader for a crane according to claim 5, characterized in that: A second push rod (601) is slidably mounted in the special-shaped through groove of the movable sleeve (201), and the second push rod (601) is fixedly mounted on the clamping shaft (303). The second push rod (601) is used in conjunction with the toothed plate (502).

7. The rotary spreader for a crane according to claim 2, characterized in that: The locking mechanism includes a driving assembly (701) installed in the hanger (1), the movable sleeve (201) is connected to the driving assembly (701), a first locking rod (702) is elastically hinged on the movable sleeve (201), and a clamping plate (703) used in conjunction with the first locking rod (702) is fixedly installed on the sliding frame (202).

8. The rotary spreader for a crane according to claim 7, characterized in that: The locking mechanism further comprises a second locking rod (801) elastically hinged to the movable sleeve (201), and the second locking rod (801) is used in conjunction with the clamping plate (703).

9. The rotary spreader for a crane according to claim 7, characterized in that: A pair of connecting rods (901) are fixedly mounted on the hanger (1), and a first unlocking plate (902) for use with the first locking rod (702) is hingedly connected to the connecting rod (901).

10. The rotary spreader for a crane according to claim 9, characterized in that: A second unlocking plate (1001) is hingedly connected to the connecting rod (901) and is used in conjunction with the second locking rod (801).

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