A rotary spreader for a crane

Abstract

The present application relates to the crane technical field, especially a kind of rotary sling for crane.It includes hanger etc.;It includes hanger, also includes slewing mechanism, slewing mechanism includes a pair of movable sleeve and a pair of sliding frame slidingly sleeved on hanger, compression spring is symmetrically arranged between movable sleeve and sliding frame, slewing sleeve that is movably connected with the inner wall of movable sleeve is rotatably installed on sliding frame.The present application can adjust slewing mechanism according to the angle of cargo required to overturn when hoisting cargo, when cargo needs to be turned ninety degrees, repulsion is generated on first magnetic plate by controlling first electromagnet, can make the sleeve enter the first guide groove of slewing sleeve, the inner wall of first guide groove is extruded by sleeve, can make slewing sleeve rotate ninety degrees, in turn make cargo rotate ninety degrees, after hoisting cargo to specified position, through locking mechanism, movable sleeve and slewing sleeve can move synchronously, cargo rotation can produce knock.

Description

TECHNICAL FIELD

[0001] The present application relates to the crane technology field, especially to a rotating sling for crane. BACKGROUND

[0002] When hoisting and transporting goods by crane, the angle of the goods can be changed by rotating the sling, for example, the steel plate is hoisted and erected or turned over, which adapts to different construction requirements and effectively improves the work efficiency.

[0003] The current rotating sling needs to be driven by independent driving source for opening and closing and rotating, which has high maintenance cost and high failure rate. If the weight of the goods is unbalanced, the driving source for driving the rotating of the sling will be subjected to great load in the process of hoisting the goods, which may cause damage to the driving source, the angle of the goods cannot be controlled, and the goods cannot be smoothly unloaded. SUMMARY

[0004] In order to overcome the shortcomings in the prior art, the present application provides a rotating sling for crane.

[0005] A rotating sling for crane, comprising a hanger, and a rotating mechanism, the rotating mechanism comprising a pair of movable sleeves and a pair of sliding frames which are sleeved on the hanger, a compression spring being symmetrically arranged between the movable sleeve and the sliding frame, a rotating sleeve being rotatably installed on the sliding frame and movably connected with the inner wall of the movable sleeve, a special-shaped through slot being formed in the movable sleeve, a first magnetic plate being movably installed in the special-shaped through slot and driven by a first electromagnet, a clamping sleeve being movably installed on the first magnetic plate, a first tension spring being arranged between the clamping sleeve and the special-shaped through slot, a first guide groove being formed in the rotating sleeve and matched with the clamping sleeve, a locking mechanism being arranged on the movable sleeve and the sliding frame for synchronously moving the movable sleeve and the sliding frame.

[0006] As an improvement of the above-mentioned scheme, the rotating mechanism further comprises a second electromagnet, a second magnetic plate being movably installed in the special-shaped through slot of the movable sleeve and driven by the second electromagnet, a clamping shaft being movably installed on the second magnetic plate, a second tension spring being arranged between the clamping shaft and the special-shaped through slot, the clamping shaft movably penetrating the clamping sleeve, a second guide groove being formed in the rotating sleeve and matched with the clamping shaft and communicated with the first guide groove, a pair of hanger plates being movably installed on the hanger, the hanger plates being fixedly connected with the sliding frames through a pair of supporting rods, a hanger claw being rotatably installed on the hanger plate, a transmission assembly being installed on the sliding frame for driving the hanger claw to rotate, the transmission assembly being connected with the rotating sleeve and the hanger plate.

[0007] As an improvement of the above-mentioned scheme, the first guide groove and the second guide groove are both 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:

[0016] 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 to avoid bumping.

[0017] 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 driving source directly connected to the lifting claw, the structure of the present application is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The overall structure of the present application is shown schematically;

[0019] Figure 2 The structure of the rotating mechanism of the present application is shown schematically;

[0020] Figure 3 The installation at the first magnetic plate of the present application is shown schematically;

[0021] Figure 4 The installation at the clamping sleeve of the present application is shown schematically;

[0022] Figure 5 The structure of the second guide groove of the present application is shown schematically;

[0023] Figure 6 The installation at the transmission assembly of the present application is shown schematically;

[0024] Figure 7 The installation at the control pin of the present application is shown schematically;

[0025] Figure 8 The structure of the locking mechanism of the present application is shown schematically;

[0026] Figure 9 The structure of the first locking rod of the present application is shown schematically.

[0027] In the drawing, 1 is a hanger, 201 is a movable sleeve, 202 is a sliding frame, 203 is a rotating sleeve, 204 is a first electromagnet, 205 is a first magnetic plate, 206 is a clamping sleeve, 207 is a first guide groove, 301 is a second electromagnet, 302 is a second magnetic plate, 303 is a clamping shaft, 304 is a second guide groove, 305 is a hanger plate, 306 is a hanger claw, 307 is a transmission assembly, 401 is a control pin, 402 is a third guide groove, 501 is a first top rod, 502 is a toothed plate, 601 is a second top rod, 701 is a driving assembly, 702 is a first locking rod, 703 is a clamping plate, 801 is a second locking rod, 901 is a connecting rod, 902 is a first unlocking plate, and 1001 is a second unlocking plate. DETAILED DESCRIPTION

[0028] The present application will be described in detail below with reference to the accompanying drawings.

[0029] Example 1

[0030] A rotating hanger for a crane, such as Figures 1-3As shown, including the hanger 1, also includes a rotary mechanism, rotary mechanism includes a pair of sliding sleeve set on the hanger 1 in the left and right direction activity set 201 and a pair of skids 202, activity set 201 and skid 202 between the symmetrically arranged compression spring, skid 202 on the through rotating installation with the activity set 201 inner wall activity connection of the rotating sleeve 203, activity set 201 on the opening of the special-shaped through slot, the special-shaped through slot in the sliding installation is driven by the first electromagnet 204 of the first magnetic plate 205, and the sliding installation is fixedly installed on the first magnetic plate 205 of the sleeve 206, the first electromagnet 204 can control the first magnetic plate 205 to drive the sleeve 206 to lift and slide, the sleeve 206 bottom and the special-shaped through slot between the first tension spring, the rotating sleeve 203 on the opening of the first guide groove 207 matched with the sleeve 206, when the sleeve 206 is clamped into the first guide groove 207 and extruded on its inner wall, the rotating sleeve 203 can be rotated, the activity set 201 and the skid 202 are provided with locking mechanism for synchronous movement of the two.

[0031] As shown in the figure, Figures 4-6 The rotary mechanism further comprises a second electromagnet 301, a second magnetic plate 302 is slidably installed in the special-shaped through slot of the activity set 201 and driven by the second electromagnet 301, and a clamping shaft 303 is slidably installed on the second magnetic plate 302, the second electromagnet 301 can control the second magnetic plate 302 to drive the clamping shaft 303 to lift upward, the second tension spring is arranged between the bottom of the clamping shaft 303 and the special-shaped through slot, the clamping shaft 303 slides through the sleeve 206, the rotating sleeve 203 is provided with a second guide groove 304 matched with the clamping shaft 303 and communicated with the first guide groove 207, 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 is slidably installed on the hanger 1, the top of the hanging plate 305 is fixedly connected with the top of the skid 202 through a pair of supporting rods, the lower part of the side of the two hanging plates 305 close to each other is rotatably installed with a hanging claw 306, a transmission assembly 307 for driving the rotary claw 306 is installed on the skid 202, the transmission assembly 307 is composed 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 skid 202 and engaged with the first gear, one end of the first transmission shaft is fixedly installed on the second gear, the other end is transmission through the hanging plate 305, the second transmission shaft is rotatably installed on the hanging plate 305 and engaged with the first transmission shaft, the bevel gear is fixedly installed on the shaft of the hanging claw 306 and engaged with the second transmission shaft.

[0032] At the beginning, the compression spring is in the released state, first determine the cargo hoisting angle of rotation, when the cargo needs to be turned ninety degrees, start the first electromagnet 204, the first electromagnet 204 generates repulsion on the first magnetic plate 205, the first magnetic plate 205 is forced to drive the sleeve 206 to lift and slide, the first tension spring is forced to extend, the sleeve 206 is lifted and the top end is clamped into the first guide groove 207, then control a pair of movable sleeves 201 to slide close to each other, the movable sleeve 201 pushes the sliding frame 202 to slide along the hanger 1 through the compression spring, the sliding frame 202 drives the hanger plate 305 to move through the support rod, the hanger plate 305 drives the hanger claw 306 to move, until both hanger claws 306 are in contact with the cargo, at this time, continue to control a pair of movable sleeves 201 to slide close to each other, and drive the hanger 1 to lift through the crane, the hanger 1 drives the cargo to lift through the hanger plate 305 and the hanger claw 306, the cargo exerts a reaction force on the hanger plate 305 through the hanger claw 306, the hanger plate 305 is forced to stop sliding through the support rod, the movable sleeve 201 drives the sleeve 206 to continue to move, and the compression spring is forced to contract. It is worth noting that the compression spring has a large elastic coefficient, so that the two hanger claws 306 can stably clamp the cargo, and the cargo will not fall off, then the sleeve 206 slides to the corner of the first guide groove 207 and extrudes the inner wall of the first guide groove 207, so that the rotating sleeve 203 rotates, the rotating sleeve 203 drives the first gear in the transmission assembly 307 to rotate, the first gear drives the first transmission shaft to rotate through the second gear, the first transmission shaft drives the bevel gear to rotate through the second transmission shaft, the bevel gear drives the hanger claw 306 to rotate, and the two hanger claws 306 drive the cargo to turn over, until the sleeve 206 slides to the end of the first guide groove 207, at this time the cargo is turned over ninety degrees under the action of the two hanger claws 306.

[0033] When the cargo needs to be turned one hundred and eighty degrees, start the second electromagnet 301, the second electromagnet 301 generates repulsion on the second magnetic plate 302, the second magnetic plate 302 is forced to drive the shaft 303 to lift and slide, the second tension spring is forced to extend, the shaft 303 is lifted and the top end is clamped into the second guide groove 304, then control a pair of movable sleeves 201 to slide close to each other, so that the two hanger claws 306 are in contact with the cargo, then continue to control a pair of movable sleeves 201 to slide close to each other, the cargo exerts a reaction force on the hanger plate 305 through the hanger claw 306, the hanger plate 305 is forced to stop sliding through the support rod, then drive the hanger 1 to lift through the crane, the hanger 1 drives the cargo to lift through the hanger plate 305 and the hanger claw 306, the movable sleeve 201 drives the shaft 303 to continue to move, then the shaft 303 slides to the corner of the second guide groove 304 and extrudes the second guide groove 304, so that the rotating sleeve 203 rotates, and the two hanger claws 306 drive the cargo to turn over, until the shaft 303 slides to the end of the second guide groove 304, at this time the cargo is turned one hundred and eighty degrees under the action of the two hanger claws 306, thereby completing the two different angle turning work of the cargo.

[0034] As Figure 7 shown, the rear side of the movable sleeve 201 is slidably installed with a control pin 401 in the front-rear direction, and the swivel sleeve 203 is provided with a third guide groove 402 matched with the control pin 401, and through the cooperation of the control pin 401 and the third guide groove 402, the swivel sleeve 203 cannot rotate.

[0035] Initially, the control pin 401 is clamped into the third guide groove 402 of the swivel sleeve 203, when the goods only need to be hoisted and transported, without turning, directly control a pair of movable sleeves 201 to slide close to each other, and then continue to control a pair of movable sleeves 201 to slide close to each other, the goods exert a reaction force on the hanger plate 305 through the hanger 306, and the hanger plate 305 is forced to stop the sliding of the sliding frame 202 through the support rod, and then the lifting frame 1 is lifted by the crane, and the lifting frame 1 lifts the goods through the hanger plate 305 and the hanger 306, and the movable sleeve 201 drives the control pin 401 to continue to move, and the control pin 401 slides along the third guide groove 402 of the swivel sleeve 203, and the control pin 401 can limit the swivel sleeve 203 through the third guide groove 402, so that the swivel sleeve 203 cannot rotate, and thus the hanger 306 cannot rotate, thereby preventing the hanger 306 from rotating when the center of gravity of the goods is forward or backward, thereby realizing the original angle hoisting of the goods.

[0036] As Figure 7 shown, the first top rod 501 is slidably installed in the special-shaped through slot of the movable sleeve 201 in the up-down direction, the first top rod 501 is fixedly installed on the clamping sleeve 206, the rear end of the control pin 401 is fixedly installed with an L-shaped plate, 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 the bottom of the L-shaped plate is fixedly installed with a toothed plate 502 used in cooperation with the first top rod 501.

[0037] As Figure 7 shown, the second top rod 601 is slidably installed in the special-shaped through slot of the movable sleeve 201 in the up-down direction, the second top rod 601 is fixedly installed on the clamping shaft 303, and the second top rod 601 is used in cooperation with the toothed plate 502, so that when the second top rod 601 is lifted, the control pin 401 can be separated from the third guide groove 402.

[0038] When the goods need to be turned over, the clamping sleeve 206 or the clamping shaft 303 is lifted and drives the first top rod 501 and the second top rod 601 to be lifted upward, respectively, the first top rod 501 or the second top rod 601 is lifted to press the toothed plate 502, the toothed plate 502 is forced to drive the control pin 401 to slide away from the swivel sleeve 203, the control pin 401 slides away from the third guide groove 402 and no longer limits the swivel sleeve 203 through the third guide groove 402, and the swivel sleeve 203 can rotate, and then the above steps are repeated to realize the turning of the goods.

[0039] As Figure 8 With Figure 9 shown, the locking mechanism includes a drive assembly 701 mounted in the hanger 1, the drive assembly 701 is composed of a drive motor, a third gear, a bidirectional screw and a fourth gear, wherein the drive motor is mounted on the hanger 1, the third gear is fixedly installed on the output shaft of the drive motor, the bidirectional screw is rotatably installed in the hanger 1 and passes through the sliding frame 202 and the hanger plate 305, the movable sleeve 201 is threadedly connected with the bidirectional screw, the first locking rod 702 is elastically connected to the movable sleeve 201, and the clamping plate 703 used in cooperation with the first locking rod 702 is fixedly installed on the sliding frame 202.

[0040] As Figure 9 shown, the locking mechanism further includes a second locking rod 801 elastically connected to the movable sleeve 201, the second locking rod 801 is located at the rear side of the first locking rod 702 and has a length greater than that of the first locking rod 702, and the second locking rod 801 is used in cooperation with the clamping plate 703.

[0041] As Figure 8 With Figure 9 shown, a pair of connecting rods 901 are fixedly installed on the hanger 1, the first unlocking plate 902 used in cooperation with the first locking rod 702 is hingedly connected to the connecting rod 901, and when the first unlocking plate 902 is in contact with the upper inclined surface of the first locking rod 702, the first locking rod 702 can be rotated.

[0042] As Figure 9 shown, the second unlocking plate 1001 used in cooperation with the second locking rod 801 is hingedly connected to the connecting rod 901, and when the second unlocking plate 1001 is in contact with the upper inclined surface of the second locking rod 801, the second locking rod 801 can be rotated.

[0043] When the goods need to be hoisted, the output shaft of the driving motor in the control driving assembly 701 is rotated, the output shaft of the driving motor drives the third gear to rotate, the third gear drives the bidirectional lead screw to rotate through the fourth gear, and the pair of movable sleeves 201 slide close to each other along the hanger 1 under the action of the bidirectional lead screw, and drive the first locking rod 702 and the second locking rod 801 on them to move. Subsequently, the second locking rod 801 contacts the second unlocking plate 1001 and pushes the second unlocking plate 1001 to rotate upward, 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. When the claws 306 contact the goods and stop the sliding of the sliding frame 202, the pair of movable sleeves 201 continue to slide close to each other under the action of the bidirectional lead screw. When the goods need to be turned by ninety degrees, the movable sleeve 201 drives the second locking rod 801 to move to contact the clamping plate 703, the edge of the clamping plate 703 presses the lower inclined surface of the second locking rod 801, the second locking rod 801 elastically contracts and rotates under the force, then the second locking rod 801 contacts the top surface of the clamping plate 703 until the lower inclined surface of the second locking rod 801 passes over the top surface of the clamping plate 703, the second locking rod 801 elastically releases and is buckled on the clamping plate 703, then the output shaft of the driving motor in the control driving assembly 701 is controlled to stop rotating, until the goods are hoisted to the designated position, then the output shaft of the driving motor in the control driving assembly 701 is controlled to rotate reversely, thereby making the bidirectional lead screw rotate reversely, and the pair of movable sleeves 201 slide away from each other under the action of the bidirectional lead screw. The movable sleeve 201 makes the sliding frame 202 slide synchronously with the movable sleeve 201 through the cooperation of the second locking rod 801 and the clamping plate 703, the sliding frame 202 drives the claws 306 to move synchronously with the movable sleeve 201 through the support rod and the hanger plate 305, the claws 306 move away from the goods and do not rotate, thereby enabling the goods to maintain the state after being turned over. The pair of movable sleeves 201 continue to slide away from each other under the action of the bidirectional lead screw, 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, the second locking rod 801 elastically contracts and rotates under the force, and is separated from the clamping plate 703. The compression spring drives the sliding frame 202 to move away from the movable sleeve 201, the sliding frame 202 drives the rotating sleeve 203 to move, the first guide groove 207 of the rotating sleeve 203 makes the rotating sleeve 203 rotate and reset under the action of the clamping sleeve 206, the rotating sleeve 203 drives the second gear to rotate through the first gear, thereby making the claws 306 rotate and reset.

[0044] When the cargo needs to be turned by 180 degrees, the above steps are repeated, the second locking rod 801 is elastically released to rotate and buckle on the clamping 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 to reset, then the lower inclined surface of the first locking rod 702 contacts the top surface of the clamping plate 703, the edge of the clamping plate 703 extrudes the lower inclined surface of the first locking rod 702, the first locking rod 702 is elastically contracted and rotated under the force, then the first locking rod 702 contacts the top surface of the clamping plate 703 until the inclined surface of the first locking rod 702 passes over the top surface of the clamping plate 703, the first locking rod 702 is elastically released to rotate and buckle on the clamping plate 703, then the output shaft of the driving motor in the driving assembly 701 is controlled to stop rotating until the cargo is lifted to the designated position, then the output shaft of the driving motor in the driving assembly 701 is controlled to rotate reversely, thereby making the bidirectional screw rotate reversely, and a pair of movable sleeves 201 slide away from each other under the action of the bidirectional screw, the movable sleeve 201 makes the sliding frame 202 slide synchronously with the movable sleeve 201 through the cooperation of the first locking rod 702 and the clamping plate 703, the sliding frame 202 drives the lifting plate 305 and the lifting claw 306 to move synchronously with the movable sleeve 201 through the support rod, the lifting claw 306 moves away from the cargo and does not rotate, thereby enabling the cargo to maintain the turned state, a pair of movable sleeves 201 continue to slide away from each other under the action of the bidirectional screw until the upper inclined surface of the first locking rod 702 contacts the first unlocking plate 902, the first unlocking plate 902 extrudes the upper inclined surface of the first locking rod 702, the first locking rod 702 is elastically contracted and rotated under the force and is separated from the clamping plate 703, the compression spring is released to drive the sliding frame 202 to move away from the movable sleeve 201, then the second locking rod 801 contacts the clamping plate 703, thereby limiting the lifting claw 306, at this time, the lifting claw 306 has been reversed by 90 degrees, until the upper inclined surface of the second locking rod 801 contacts the second unlocking plate 1001, thereby making the lifting claw 306 rotate to reset.

[0045] Through the above steps, when the lifting claw 306 releases the cargo, the lifting claw 306 cannot rotate, preventing the cargo from being knocked due to the premature rotation of the lifting claw 306, thereby completing the lifting and turning work of the cargo.

[0046] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A slewing spreader for a crane comprising a spreader frame (1), characterised in that: The rotary mechanism further comprises a second electromagnet (301), the special-shaped through slot of the movable sleeve (201) is slidably provided with a second magnetic plate (302) driven by the second electromagnet (301), and a clamping shaft (303) fixedly installed on the second magnetic plate (302) is slidably installed, the clamping shaft (303) and the special-shaped through slot are provided with a second tension spring, the clamping shaft (303) slidably penetrates the clamping sleeve (206), the rotary sleeve (203) is provided with a second guide groove (304) matched with the clamping shaft (303) and communicated with the first guide groove (207), the hanger (1) is slidably provided with a pair of hanging plates (305), the hanging plates (305) are fixedly connected with the sliding frame (202) through a pair of supporting rods, the hanging plates (305) are rotatably provided with hanging claws (306), the sliding frame (202) is provided with a transmission assembly (307) for driving the rotary movement of the hanging claws (306), and the transmission assembly (307) is connected with the rotary sleeve (203) and the hanging plates (305). The first guide groove (207) and the second guide groove (304) are both spiral structures.

2. A slewing spreader for a crane according to claim 1, characterised in that: The movable sleeve (201) is provided with a control pin (401) penetratingly and slidably installed, and the rotary sleeve (203) is provided with a third guide groove (402) matched with the control pin (401).

3. A slewing spreader for a crane according to claim 1, characterized in that: The special-shaped through slot of the movable sleeve (201) is slidably provided with a first jacking rod (501), the first jacking rod (501) is fixedly installed on the clamping sleeve (206), the control pin (401) is fixedly installed with an L-shaped plate, the L-shaped plate and the movable sleeve (201) are provided with a third tension spring, and the L-shaped plate is fixedly installed with a toothed plate (502) used in cooperation with the first jacking rod (501).

4. A slewing spreader for a crane according to claim 3, characterised in that: The special-shaped through slot of the movable sleeve (201) is slidably provided with a second jacking rod (601), the second jacking rod (601) is fixedly installed on the clamping shaft (303), and the second jacking rod (601) is used in cooperation with the toothed plate (502).

5. A slewing spreader for a crane according to claim 4, characterised in that: ​ 6. A rotating spreader for a crane according to claim 1, characterized in that: The locking mechanism comprises a driving assembly (701) installed in the hanger (1), the movable sleeve (201) is connected with the driving assembly (701), the first locking rod (702) is elastically connected to the movable sleeve (201), and the sliding frame (202) is fixedly provided with the clamping plate (703) matched with the first locking rod (702).

7. A slewing spreader for a crane according to claim 6, characterised in that: The locking mechanism further comprises a second locking rod (801) elastically connected to the movable sleeve (201), and the second locking rod (801) is matched with the clamping plate (703).

8. A slewing spreader for a crane according to claim 7, characterised in that: A pair of connecting rods (901) are fixedly installed on the hanger (1), the first unlocking plate (902) matched with the first locking rod (702) is hinged to the connecting rod (901).

9. A slewing spreader for a crane according to claim 8, characterised in that: The second unlocking plate (1001) matched with the second locking rod (801) is hinged to the connecting rod (901).

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