A lifting device for cylindrical workpieces

Abstract

The utility model relates to hoisting tool technical field, concretely relates to a kind of lifting device for cylindrical workpiece, including lifting ring and two clamping plates about the symmetrical setting of lifting ring, the upper end of clamping plate is rotatably connected with lifting ring, the lifting device further include locking lever and two locking seats about the symmetrical setting of lifting ring, two the locking seat is respectively arranged in the lower end of two clamping plates, the both ends of locking lever are equipped with thread of opposite rotation and respectively pass through two locking seats, by rotating the locking lever two locking seats can be mutually close or mutually far apart.The utility model solves the problem that the disassembly between the hoisting tool in the prior art and cylindrical workpiece is more complex.

Description

Technical Field

[0001] This utility model relates to the field of lifting tools, specifically to a lifting device for cylindrical workpieces. Background Technology

[0002] In industrial production, cylindrical workpieces are a common and important type of workpiece, widely used in various mechanical equipment and structures. However, since cylindrical workpieces typically lack lifting holes, they are difficult to lift using overhead cranes or other lifting equipment. If lifting holes are pre-machined into the workpiece, additional machining processes are required after lifting, which not only increases production costs but also reduces lifting efficiency.

[0003] Therefore, in the existing technology, lifting tools are usually used to assist in lifting cylindrical workpieces, but the disassembly and assembly between existing lifting tools and cylindrical workpieces is often quite complicated. Summary of the Invention

[0004] This invention addresses the problem of complex assembly and disassembly of lifting tools and cylindrical workpieces in existing technologies by providing a lifting device for cylindrical workpieces. The lifting device of this invention allows for assembly and disassembly of the cylindrical workpiece simply by rotating the locking rod, making operation straightforward.

[0005] The technical solution of this utility model is: a lifting device for cylindrical workpieces, including a lifting ring and two clamping plates symmetrically arranged about the lifting ring. The upper end of the clamping plate is rotatably connected to the lifting ring. The lifting device also includes a locking rod and two locking seats symmetrically arranged about the lifting ring. The two locking seats are respectively arranged at the lower ends of the two clamping plates. The two ends of the locking rod are provided with threads of opposite directions and pass through the two locking seats respectively. By rotating the locking rod, the two locking seats can move closer to each other or further away from each other.

[0006] Using the above solution, rotating the locking rod can cause the locking seats below the clamping plates to move closer or further apart, thereby causing the two clamping plates to rotate around the lifting ring, thus clamping or releasing the cylindrical workpiece. Furthermore, by continuously rotating the locking rod, the two clamping plates can be made to move further apart, eventually causing the locking rod to disengage from the locking seat, making it easier to remove the clamping plates and facilitating the disassembly and assembly of the lifting device.

[0007] Based on the above solution, the present invention can be further improved as follows: Furthermore, the locking seat includes a locking plate and a connecting block. The lower part of the locking plate is hollow and fixedly disposed below the clamping plate. The locking plate is provided with a horizontal slot with its opening facing away from the lifting ring. The connecting block is located at the lower part of the locking plate. Both ends of the connecting block are engaged in the slot and the middle part of the connecting block is provided with a threaded hole.

[0008] Furthermore, the bottom end of the locking plate and the lower parts of the opposite sides have openings, and the locking rod passes through the opening at the bottom of the locking plate into the threaded hole.

[0009] By adopting the above-mentioned further solution, a slot is set on the locking plate for locking the connecting block. At the same time, the middle part of the connecting block is threadedly connected to the locking rod. When it is necessary to clamp the cylindrical workpiece, the connecting block can be driven to move closer to each other by continuously rotating the locking rod until the limit position inside the slot is reached. Then, rotating the locking rod will drive the two clamping plates to move closer to each other and clamp the cylindrical workpiece under the action of the connecting block. Furthermore, since there are openings at the bottom of the locking plate and on the lower parts of the opposite sides, the locking rod and the connecting block can be removed from the bottom of the locking plate simply by rotating the locking rod in the opposite direction until the connecting block disengages from the slot. This not only makes it easier to disassemble and assemble the lifting device, but also makes it easier to replace the connecting block.

[0010] Furthermore, the locking seat also includes an anti-detachment slider and a fastener located on the front and / or rear side of the locking plate. The anti-detachment slider has a slot two with a vertically upward opening, and the two ends of the connecting block that are locked in the slot one are also locked in the slot two. The anti-detachment slider can slide vertically relative to the locking plate. After sliding into place, the anti-detachment slider and the locking plate are fixed by fasteners.

[0011] By adopting the above-mentioned further solution, the connecting block can be locked in the first slot to achieve vertical limitation, and the connecting block can be locked in the left and right directions by setting the second slot, thereby ensuring the stability of the connecting block during use, that is, ensuring the stability of the lifting device during use. Furthermore, the second slot is located on an anti-detachment slider that can slide vertically relative to the locking plate. By sliding the anti-detachment slider, the second slot can be used to engage or disengage the connecting block, making the operation simple.

[0012] Furthermore, the anti-detachment slider has a vertical groove, the locking plate has a threaded hole, and the fastener is a bolt. The bolt passes through both the groove and the threaded hole, and tightening the bolt can tighten and loosen the anti-detachment slider and the locking plate.

[0013] Furthermore, the anti-detachment slider does not contact the locking rod, the connecting block can rotate within slot one and slot two, and the locking rod can be moved out from the bottom of the locking plate and the anti-detachment slider.

[0014] By adopting the above-mentioned further solution, the anti-detachment slider does not restrict the movement of the locking rod when restricting the left and right movement of the connecting block. Since the connecting block can rotate within slot one and slot two, by moving only one side of the anti-detachment slider and then rotating the locking rod, the locking rod on that side will continuously protrude from the connecting block on that side when the connecting block at one end of the locking rod is restricted by slot one and slot two. The connecting block at the other end can disengage from slot one and slot two, thereby allowing the locking rod to rotate up and down around the connecting block at one end, thus realizing another way to disassemble and assemble the lifting device.

[0015] Furthermore, both slot one and slot two are U-shaped slots, and the shape and size of both ends of the connecting block are changed to form connecting posts, which are engaged in slot one and slot two.

[0016] Furthermore, the lifting ring and the clamping plate are rotatably connected by a hinge unit. The lifting ring is located in the middle of the hinge unit, and the two clamping plates are located on both sides of the hinge unit. Both clamping plates are provided with lifting lugs in the middle of their vertical direction. By providing additional lifting lugs, it is convenient to select different lifting methods according to actual lifting requirements.

[0017] Furthermore, the hinge unit includes a connecting plate and a connecting shaft arranged symmetrically on the left and right sides. One end of the connecting plate is rotatably connected to the connecting shaft, and the other end is fixedly connected to the upper end of the clamping plate on the same side. The lifting ring is rotatably located in the middle of the connecting shaft.

[0018] Furthermore, the connecting plate includes an L-shaped crank arm and a reinforcing plate. One end of the L-shaped crank arm is rotatably connected to the connecting shaft, and the other end is connected to the clamping plate on the same side. There are two L-shaped crank arms, which are located at the front and rear ends of the connecting shaft respectively. The reinforcing plate is disposed between the two L-shaped crank arms.

[0019] The beneficial effects of this utility model through the above technical solution are as follows: 1. In this utility model, by rotating the locking rod, the locking seats below the clamping plates can be moved closer or further apart, thereby driving the two clamping plates to rotate around the lifting ring, so as to clamp or release the cylindrical workpiece; and by continuously rotating the locking rod, the two clamping plates can be moved further apart, eventually causing the locking rod to disengage from the locking seat, making it easy to remove the clamping plates, and also facilitating the disassembly and assembly of the lifting device.

[0020] 2. In a further embodiment of this utility model, a slot is provided on the locking plate for securing the connecting block. The middle part of the connecting block is threadedly connected to the locking rod. When it is necessary to clamp the cylindrical workpiece, the connecting blocks can be moved closer together by continuously rotating the locking rod until they reach the limit position inside the slot. Then, rotating the locking rod will cause the two clamping plates to move closer together and clamp the cylindrical workpiece under the action of the connecting block. Since there are openings at the bottom and the lower parts of the opposite sides of the locking plate, the locking rod and the connecting block can be removed from the bottom of the locking plate by simply rotating the locking rod in the opposite direction until the connecting block is disengaged from the slot. This not only makes it easier to disassemble and assemble the lifting device, but also makes it easier to replace the connecting block.

[0021] 3. In a further embodiment of this utility model, by setting the second slot, the connecting block can be limited in the left and right directions, thereby ensuring the stability of the connecting block during use, that is, ensuring the stability of the lifting device during use; and the second slot is set on the anti-detachment slider that can slide relative to the locking plate in the vertical direction, so that the connecting block can be locked or released by sliding the anti-detachment slider, which is simple to operate. Attached Figure Description

[0022] Figure 1 This is one of the structural schematic diagrams of this utility model; Figure 2 This is the second structural schematic diagram of this utility model; Figure 3 This is one of the partial structural schematic diagrams of this utility model; Figure 4 yes Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is the second partial structural schematic diagram of this utility model.

[0023] The attached diagram is labeled as follows: 1. Lifting ring, 2. Clamping plate, 201. Lifting lug, 3. Locking rod; 4. Locking seat, 401. Locking plate, 402. Connecting block, 403. Slot 1, 404. Threaded hole 1, 405. Anti-detachment slider, 406. Fastener, 407. Slot 2, 408. Slide groove, 409. Threaded hole 2. 5. Hinge unit, 501. Connecting plate, 502. Connecting shaft. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figure 1 and Figure 2As shown, a lifting device for cylindrical workpieces includes a lifting ring 1 and two clamping plates 2 symmetrically arranged about the left and right sides of the lifting ring 1. The upper end of the clamping plate 2 is rotatably connected to the lifting ring 1. The lifting device also includes a locking rod 3 and two locking seats 4 symmetrically arranged about the left and right sides of the lifting ring 1. The two locking seats 4 are respectively located at the lower ends of the two clamping plates 2. The two ends of the locking rod 3 are provided with threads of opposite directions and pass through the two locking seats 4 respectively. The locking rod 3 is a threaded rod with the threads at both ends of the threaded rod having opposite directions. By rotating the locking rod 3, the two locking seats 4 can move closer to each other or further away from each other.

[0025] In this embodiment, by rotating the locking rod 3, the locking seats 4 below the clamping plate 2 can be moved closer or further apart, thereby causing the two clamping plates 2 to rotate around the lifting ring 1, so as to clamp or release the cylindrical workpiece; and by continuously rotating the locking rod 3, the two clamping plates 2 can be moved further apart, eventually causing the locking rod 3 to disengage from the locking seat 4, making it easy to remove the clamping plates 2, and also making it easy to disassemble and assemble the lifting device.

[0026] As one possible implementation method, such as Figure 3 and Figure 4 As shown, the locking seat 4 includes a locking plate 401 and a connecting block 402. The lower part of the locking plate 401 is hollow and fixedly disposed below the clamping plate 2. The locking plate 401 is provided with a horizontal slot 403 with its opening facing away from the lifting ring 1. The slot 403 is located at the lower part of the locking plate 401. The connecting block 402 is located at the lower hollow part of the locking plate 401. The front and rear ends of the connecting block 402 are engaged in the slot 403. The middle part of the connecting block 402 is provided with a threaded hole 404.

[0027] As one possible implementation method, such as Figure 4 As shown, the bottom end and the lower parts of the opposite sides of the locking plate 401 have openings. The hollow part of the lower part of the locking plate 401 is connected to the opening at the bottom. Specifically, the locking plate 401 is composed of two vertical plates and one horizontal plate. The horizontal plate is located in the upper middle part between the two vertical plates. The locking rod 3 passes through the opening at the lower part of the locking plate 401 and is inserted into the threaded hole 404.

[0028] In this embodiment, a slot 403 is provided on the locking plate 401 to hold the connecting block 402. At the same time, the middle part of the connecting block 402 is threadedly connected to the locking rod 3. When it is necessary to clamp the cylindrical workpiece, the connecting block 402 can be driven to move closer to each other by continuously rotating the locking rod 3 until the limit position inside the slot 403 is reached. Then, rotating the locking rod 3 will drive the two clamping plates 2 to move closer to each other and clamp the cylindrical workpiece under the action of the connecting block 402. Furthermore, since the bottom of the locking plate 401 and the lower parts of the opposite sides have openings, the locking rod 3 and the connecting block 402 can be removed from the bottom of the locking plate 401 simply by rotating the locking rod 3 in the opposite direction until the connecting block 402 disengages from the slot 403. This not only makes it easier to disassemble and assemble the lifting device, but also makes it easier to replace the connecting block 402.

[0029] As one possible implementation method, such as Figure 3 and Figure 4 As shown, the locking seat 4 also includes an anti-detachment slider 405 and a fastener 406 disposed on the front and / or rear side of the locking plate 401. The anti-detachment slider 405 is provided with a groove 407 with a vertically upward opening. The two ends of the connecting block 402, which are engaged in the groove 403, are also engaged in the groove 407. The anti-detachment slider 405 can slide vertically relative to the locking plate 401. After sliding into place, the anti-detachment slider 405 and the locking plate 401 are fixed by fasteners 406. Specifically, when the connecting block 402 is in the locked state, the anti-detachment slider 405 is relatively higher relative to the locking plate 401. When the connecting block 402 is in the relaxed state, the anti-detachment slider 405 is relatively lower relative to the locking plate 401.

[0030] In this embodiment, the connecting block 402 is locked in the slot 403 to achieve vertical positioning, and the connecting block 402 is positioned in the left and right directions by setting the slot 407, thereby ensuring the stability of the connecting block 402 during use, that is, ensuring the stability of the lifting device during use. Furthermore, the second slot 407 is located on the anti-detachment slider 405, which can slide vertically relative to the locking plate 401. By sliding the anti-detachment slider 405, the second slot 407 can be engaged with or released from the connecting block 402, making the operation simple.

[0031] As one possible implementation method, such as Figure 4 As shown, the anti-detachment slider 405 has a vertical groove 408, the locking plate 401 has a threaded hole 409, and the fastener 406 is a bolt. The bolt passes through both the groove 408 and the threaded hole 409. Tightening the bolt can tighten and loosen the anti-detachment slider 405 and the locking plate 401, thereby enabling the anti-detachment slider 405 to slide and be fixed relative to the locking plate 401.

[0032] As one possible implementation method, such as Figure 3 and Figure 5As shown, the anti-detachment slider 405 does not contact the locking rod 3. Specifically, when the anti-detachment slider 405 is only provided on the front or rear side of the locking plate 401, the anti-detachment slider 405 will naturally not contact the locking rod 3. When the anti-detachment slider 405 is provided on both the front and rear sides of the locking plate 401, by making the upper part of the anti-detachment slider 405 near the lifting ring 1 fixedly connected by a horizontal plate and the lower part forming an opening, it can be ensured that the anti-detachment slider 405 has space for the locking rod 3 to pass through. That is, it can ensure the sliding consistency of the anti-detachment slider 405 and will not restrict the movement of the locking rod 3, so that the locking rod 3 is only connected to the connecting block 402. The connecting block 402 can rotate in the slot 1 403 and the slot 2 407, and the locking rod 3 can be moved out from the bottom of the locking plate 401 and the anti-detachment slider 405.

[0033] In this embodiment, the anti-detachment slider 405, while restricting the left-right movement of the connecting block 402, does not restrict the movement of the locking rod 3. Furthermore, since the connecting block 402 can rotate within slots 403 and 407, by simply moving one side of the anti-detachment slider 405 and then rotating the locking rod 3, the connecting block 402 at one end of the locking rod 3 can be restricted by slots 403 and 407 (when rotating the locking rod 3, the locking rod 3 on that side will continuously protrude from the connecting block 402 on that side), while the connecting block 402 at the other end can disengage from slots 403 and 407. This allows the locking rod 3 to rotate up and down around the connecting block 402 at one end (e.g., ...). Figure 5 As shown in the figure, this enables another method of disassembling and assembling the lifting device.

[0034] As one possible implementation method, such as Figure 5 As shown, both slot 1 403 and slot 2 407 are U-shaped slots. The shape and size of both ends of the connecting block 402 are changed to form connecting posts, so that the two ends of the connecting block 402 before the size is changed can be locked between the locking plates 401, thereby realizing the front and rear direction limit of the connecting block 402, thus realizing the left, right, front and rear and up and down directions limit of the connecting block 402. The connecting posts are locked in slot 1 403 and slot 2 407.

[0035] As one possible implementation method, such as Figure 1 and Figure 2 As shown, the lifting ring 1 and the clamping plate 2 are rotatably connected by the hinge unit 5. The clamping plate 2 is an arc-shaped plate and the inner side of the clamping plate 2 is provided with a rubber pad, which can increase the friction with the cylindrical workpiece. The lifting ring 1 is located in the middle of the hinge unit 5. The two clamping plates 2 are located on the left and right sides of the hinge unit 5 respectively, and the middle of the vertical direction of the two clamping plates 2 is provided with a lifting lug 201. By additionally setting the lifting lug 201, it is convenient to select different lifting methods according to the actual lifting requirements.

[0036] As one possible implementation method, such as Figure 1 and Figure 2 As shown, the hinge unit 5 includes a connecting plate 501 and a connecting shaft 502 arranged symmetrically on the left and right. One end of the connecting plate 501 is rotatably connected to the connecting shaft 502, and the other end is fixedly connected to the upper end of the clamping plate 2 on the same side. The lifting ring 1 is rotatably located in the middle of the connecting shaft 502.

[0037] As one possible implementation method, such as Figure 1 and Figure 2 As shown, the connecting plate 501 includes an L-shaped crank arm and a reinforcing plate. One end of the L-shaped crank arm is rotatably connected to the connecting shaft 502, and the other end is connected to the clamping plate 2 on the same side. There are two L-shaped crank arms, which are located at the front and rear ends of the connecting shaft 502 respectively. That is, the lifting ring 1 is located between the two L-shaped crank arms, and the reinforcing plate is located between the two L-shaped crank arms.

[0038] In this embodiment, when used: With the initial state being the clamped cylindrical workpiece, when it is necessary to disassemble the lifting device, the locking rod 3 can be simultaneously disengaged from the locking seats 4 at both ends. That is, the following operations are performed simultaneously at both ends of the locking rod 3 (not performing them simultaneously will not affect the final disassembly result): First, tighten the fastener 406 to loosen the locking plate 401 and the anti-detachment slider 405. Then, slide the anti-detachment slider 405 downwards to disengage the slot 407 from the connecting block 402. Tighten the fastener 406 in the opposite direction to lock the locking plate 401 and the anti-detachment slider 405 (whether locking is necessary can be selected according to the actual situation). After the anti-detachment sliders 405 at both ends of the locking rod 3 are disengaged from the connecting blocks 402, the locking rod 3 is rotated. Under the restriction of the slot 403, the connecting blocks 402 at both ends will not rotate with the locking rod 3, but will continuously move away from each other until the connecting blocks 402 at both ends are completely disengaged from the slot 403. Then the locking rod 3 and the connecting blocks 402 can be taken out from below the locking plate 401 and the anti-detachment sliders 405. At this time, the clamping plates 2 on both sides are more convenient to rotate and open, making it easier to remove from the cylindrical workpiece and also easier to install on the cylindrical workpiece for the next use.

[0039] Alternatively, the locking rod 3 can be disengaged from only one end of the locking seat 4. This can be achieved by performing the following operations on one end of the locking rod 3: First, tighten the fastener 406 to loosen the locking plate 401 and the anti-detachment slider 405. Then, slide the anti-detachment slider 405 downwards, causing the slot 407 to disengage from the connecting block 402. Tighten the fastener 406 in the opposite direction to lock the locking plate 401 and the anti-detachment slider 405 (locking may or may not be necessary depending on the situation). At this point, since the connecting block 402 at one end of the locking rod 3 has not disengaged from the slot 407, rotating the locking rod 3 will cause the connecting block 402 at one end of the locking rod 3 to disengage from the slot 407. As the connecting block 402 continuously disengages from the slot 403 at one end, the other end of the locking rod 3 will continuously protrude from the connecting block 402 at that end until the connecting block 402 at one end of the locking rod 3 is completely disengaged from the slot 403 at that end. By moving the locking rod 3, the locking rod 3 can rotate up and down around the connecting block 402 at one end. At this time, the rotation and opening of the clamping plate 2 on one side will be restricted by the locking rod 3. However, the entire operation process is simpler than the locking rod 3 disengaging from the locking seats 4 at both ends. Similarly, the next operation of using the lifting device to clamp the cylindrical workpiece will also be simpler.

[0040] The above two operating methods can be selected appropriately based on the actual installation space.

[0041] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Any equivalent or similar modifications or substitutions to the technical solutions of the present invention without departing from the spirit of the present invention or the scope of disclosure shall fall within the protection scope of the present invention.

Claims

1. A lifting device for cylindrical workpieces, comprising a lifting ring (1) and two clamping plates (2) symmetrically arranged about the lifting ring (1), wherein the upper end of the clamping plates (2) is rotatably connected to the lifting ring (1), characterized in that, The lifting device also includes a locking rod (3) and two locking seats (4) symmetrically arranged about the lifting ring (1). The two locking seats (4) are respectively located at the lower ends of the two clamping plates (2). The two ends of the locking rod (3) are provided with threads of opposite directions and pass through the two locking seats (4) respectively. By rotating the locking rod (3), the two locking seats (4) can move closer to each other or further away from each other.

2. The lifting device for cylindrical workpieces according to claim 1, characterized in that, The locking seat (4) includes a locking plate (401) and a connecting block (402). The lower part of the locking plate (401) is hollow and fixedly located below the clamping plate (2). The locking plate (401) has a horizontal slot (403) with its opening facing away from the lifting ring (1). The connecting block (402) is located at the lower part of the locking plate (401). Both ends of the connecting block (402) are engaged in the slot (403). The middle part of the connecting block (402) has a threaded hole (404) that connects to the locking rod (3).

3. The lifting device for cylindrical workpieces according to claim 2, characterized in that, The bottom end of the locking plate (401) and the lower parts of the opposite sides are open, and the locking rod (3) passes through the opening at the bottom of the locking plate (401) and is inserted into the threaded hole (404).

4. The lifting device for cylindrical workpieces according to claim 2, characterized in that, The locking seat (4) also includes an anti-detachment slider (405) and a fastener (406) provided on the front and / or rear side of the locking plate (401). The anti-detachment slider (405) is provided with a slot two (407) with the opening vertically upward. The two ends of the connecting block (402) which are locked in the slot one (403) are also locked in the slot two (407). The anti-detachment slider (405) can slide vertically relative to the locking plate (401). After sliding into place, the anti-detachment slider (405) and the locking plate (401) are fixed by fasteners (406).

5. The lifting device for cylindrical workpieces according to claim 4, characterized in that, The anti-detachment slider (405) has a vertical groove (408), the locking plate (401) has a threaded hole (409), the fastener (406) is a bolt, the bolt passes through both the groove (408) and the threaded hole (409), and turning the bolt can achieve the tightening and loosening of the anti-detachment slider (405) and the locking plate (401).

6. The lifting device for cylindrical workpieces according to claim 4 or 5, characterized in that, The anti-detachment slider (405) does not contact the locking rod (3), the connecting block (402) can rotate within the slot one (403) and slot two (407), and the locking rod (3) can be moved out from the bottom of the locking plate (401) and the anti-detachment slider (405).

7. The lifting device for cylindrical workpieces according to claim 6, characterized in that, Both slot one (403) and slot two (407) are U-shaped slots. The shape and size of both ends of the connecting block (402) are changed to form connecting columns. The connecting columns are inserted into slot one (403) and slot two (407).

8. The lifting device for cylindrical workpieces according to claim 4 or 5, characterized in that, The lifting ring (1) and the clamping plate (2) are rotatably connected by a hinge unit (5). The lifting ring (1) is located in the middle of the hinge unit (5), and the two clamping plates (2) are located on both sides of the hinge unit (5). The two clamping plates (2) are provided with lifting lugs (201) in the middle of the vertical direction.

9. The lifting device for cylindrical workpieces according to claim 8, characterized in that, The hinge unit (5) includes a connecting plate (501) and a connecting shaft (502) arranged symmetrically on the left and right. One end of the connecting plate (501) is rotatably connected to the connecting shaft (502), and the other end is fixedly connected to the upper end of the clamping plate (2) on the same side. The lifting ring (1) is rotatably located in the middle of the connecting shaft (502).

10. The lifting device for cylindrical workpieces according to claim 9, characterized in that, The connecting plate (501) includes an L-shaped crank arm and a reinforcing plate. One end of the L-shaped crank arm is rotatably connected to the connecting shaft (502), and the other end is connected to the clamping plate (2) on the same side. There are two L-shaped crank arms, which are located at the front and rear ends of the connecting shaft (502) respectively. The reinforcing plate is located between the two L-shaped crank arms.

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