An automatic lifting device suitable for transporting cylindrical thin shells and its application method

Abstract

The present invention discloses an automatic lifting device suitable for the transportation of cylindrical thin shells and an application method thereof. The device includes a heavy-duty clamp and a lifting mechanism connected to the upper end thereof; the heavy-duty clamp includes a base, a clamping claw and a push-pull power device. The bottom of the base has an arc-shaped clamping plate, the shape of the clamping claw matches the shape of the arc-shaped clamping body, a pair of clamping claws are symmetrically connected to the base about the arc-shaped clamping plate, the upper ends of the two clamping claws are respectively hinged with push-pull power devices, the arc-shaped clamping plate at the bottom of the base also serves as a slide rail when the clamping claw moves, and the push-pull power device pushes and pulls the clamping claws to slide along the slide rail to achieve the operation of clamping and releasing the product. The clamp can clamp and hold the cylindrical thin shell under the condition of a very small space gap. The lifting mechanism is a rigid mechanism, including a lifting power device and a guide cylinder, the lower end of the guide cylinder is fixed to the upper end of the base through a connecting seat, the lifting power device is connected to the guide cylinder concentrically, and the lifting of the heavy-duty clamp is achieved by the lifting power device.

Description

Technical Field

[0001] The invention relates to a lifting device, in particular to a lifting device used for automatic lifting of a cylindrical thin shell and an application method thereof. Background Art

[0002] During the transportation of large cylindrical thin shell products, hoisting is required. However, due to its large aspect ratio, it is usually several meters or even dozens of meters long, so it is affected by space constraints during hoisting. The weight can reach tens of tons, but the shell is thin, so general hoisting fixtures cannot be directly used.

[0003] At present, the transportation of large cylindrical thin shell products mainly adopts manual lifting. However, due to the above-mentioned characteristics of this type of product, the equipment for manual lifting generally adopts a crane or a crane. The crane or the crane is lifted by a wire rope, and the wire rope is a flexible body. There is a swaying and unstable situation during the lifting process, which is easy to cause safety accidents. Therefore, multiple professionals are required to cooperate in the lifting operation, and the lifting efficiency is low.

[0004] In addition, large cylindrical thin-shell products are generally transported by vans, and the width of the transport vehicle is limited by road regulations, so the gap between the outer surface of the product and the wall of the carriage is very small during shipment. When transporting from the vehicle to the designated location, it is also impossible to use a crane or a crane to lift it, because when lifting it by a crane or a crane, it is necessary to manually use a sling to wrap the product radially, which is obviously impossible to operate when the gap between the product and the wall of the carriage is very small. Moreover, general lifting fixtures cannot be operated in a narrow gap space to clamp and lift large cylindrical thin-shell products. Summary of the invention

[0005] The purpose of the present invention is to provide a device and an application method thereof that can automatically clamp and lift large cylindrical thin shell products from a narrow gap space, so that lifting equipment such as a crane or a crane can use this device to transport large cylindrical thin shell products.

[0006] The automatic lifting device suitable for the transportation of cylindrical thin shells provided by the present invention comprises a heavy-duty clamp and a lifting mechanism connected to the upper end thereof; the heavy-duty clamp comprises a base, a clamping claw and a push-pull power device, the bottom of the base is provided with an arc-shaped clamping plate, the shape of the clamping claw matches the shape of the arc-shaped clamping body, a pair of clamping claws are symmetrically connected to the base about the arc-shaped clamping plate, the upper ends of the two clamping claws are respectively hinged with push-pull power devices, the arc-shaped clamping plate at the bottom of the base also serves as a slide rail when the clamping claw moves, and the push-pull power device pushes and pulls the clamping claws to slide along the slide rail to realize the operation of clamping and releasing the product; the lifting mechanism is a rigid mechanism, comprising a lifting power device and a guide cylinder, the lower end of the guide cylinder is fixed to the upper end of the base through a connecting seat, the lifting power device is concentrically connected to the guide cylinder and connected in the guide cylinder, and the lifting of the heavy-duty clamp is realized by the lifting power device.

[0007] In one embodiment of the above technical solution, the base is a rectangular frame structure, including a radial connecting plate, an axial connecting plate and a top enclosure plate. The two radial connecting plates are symmetrically arranged front to back, and the two axial connecting plates are symmetrically connected to the bottom of both ends of the radial connecting plates left to right. The top enclosure plate connects the tops of the two radial connecting plates into a whole.

[0008] In one embodiment of the above technical solution, the radial connecting plate includes a rectangular plate and the arc-shaped clamping plate. The rectangular plate is arranged vertically, and its lower bottom edge has an upper concave arc-shaped groove symmetrical with respect to the center plane in its length direction. The arc-shaped clamping plate is connected to the groove surface of the upper concave arc-shaped groove, and the inner side of the arc-shaped clamping plate extends out of the inner side of the rectangular plate, and the two ends of the arc-shaped clamping plate also symmetrically extend out limited position bosses.

[0009] In one embodiment of the above technical solution, thinning sections are symmetrically arranged at both axial ends of the clamping jaw, a U-shaped groove is arranged along its axial direction on the upper side of the clamping jaw, bosses matching the limiting bosses are arranged at both ends of the U-shaped groove, and the inner arc surface of the thinning section is a contoured surface on the upper surface of the arc-shaped clamping plate; a pair of ear plates are respectively arranged in the middle of the U-shaped grooves on the upper sides of the two clamping jaws, and the two pairs of ear plates are symmetrically arranged about the center plane in the length direction of the clamping jaws.

[0010] In one implementation of the above technical solution, the inner surface of the axial connecting plate has a contoured surface of the outer surface of the clamping jaw, and the axial connecting plate is connected to the radial connecting plate to form a slide groove of the clamping jaw.

[0011] In one embodiment of the above technical solution, the top enclosure plate includes two inverted V-shaped plates and an I-shaped plate connected between the two inverted V-shaped plates, the top of the inverted V-shaped plate is a horizontal transition edge, the two inverted V-shaped plates are connected to the tops of both ends of the two radial connecting plates, the top plate of the I-shaped plate is flush with the top edge of the inverted V-shaped plate, and the outer edges of the two horizontal side plates are flush with the upper edges of the radial connecting plates; two pairs of ear plates are arranged on both sides of the center plane in the longitudinal direction of the top plate of the I-shaped plate, and their lateral positions correspond to the positions of the ear plates on the two clamps.

[0012] In one embodiment of the above technical solution, the push-pull power device is a cylinder, a cylinder end of which is hinged to the ear plate on the top enclosure through a pin, and a piston rod end is hinged to the ear plate in the middle of the U-shaped groove on the upper side of the clamp through a pin; reinforcing struts are symmetrically connected at both ends of the top between the two radial connecting plates, and the reinforcing struts are respectively located on the outside of the piston rod of the corresponding side cylinder.

[0013] In one embodiment of the above technical solution, the lifting power device is a multi-stage telescopic cylinder, and the guide cylinder includes multiple layers of concentrically mounted and relatively slidable cylinders, and non-metallic lining plates are arranged between adjacent cylinders. A pair of ear plates are symmetrically arranged at the bottom of the innermost cylinder about its axial center plane, and the piston rod head of the multi-stage telescopic cylinder is hinged with a pin connecting the two ear plates, and the base plate at the upper end of the cylinder body is connected to the upper end of the outermost cylinder of the guide cylinder.

[0014] In one embodiment of the above technical solution, the number of cylinder layers of the guide cylinder is the same as the number of levels of the piston rod of the lifting power device, and the lower end of the innermost cylinder of the guide cylinder is provided with a flange plate, the lower end of the connecting seat is connected to the I-shaped plate of the base enclosure, and the upper end is docked and fixed with the flange plate.

[0015] The method for transporting a cylindrical thin shell using the automatic lifting device provided by the present invention comprises the following steps:

[0016] (1) Fix the base plate at the upper end of the lifting cylinder body of the lifting mechanism to the lifting equipment, and make the multi-stage piston rod of the lifting cylinder in a retracted state;

[0017] (2) The piston rod of the push-pull cylinder of the heavy-duty clamp is retracted so that the two clamping jaws are in a retracted state;

[0018] (3) The device is moved to the top of the cylindrical thin shell to be transported by means of a lifting device, and the clamping center of the two clamping jaws is located on the axial center plane of the vertical plane corresponding to the product;

[0019] (4) Push out the multi-stage piston rod of the lifting cylinder step by step, so that the heavy clamp moves down until the lower side of the two clamping jaws is 10-15 mm away from the outer surface of the product to be clamped;

[0020] (5) Push out the piston rod of the push-pull cylinder of the heavy-duty clamp, and the clamping jaws slide downward under the action of the piston rod until the boss on the upper side of the clamping jaws contacts and is limited by the limiting boss at the bottom of the base. At this time, the arc-shaped clamping plate and the clamping jaws cover and hold the cylindrical thin shell tightly;

[0021] (6) The piston rod of the lifting cylinder of the lifting mechanism is retracted step by step, so that the heavy clamp holding the cylindrical thin shell is lifted;

[0022] (7) The lifting equipment is operated to transport the cylindrical thin shell to the designated location.

[0023] The present invention realizes the lifting and lowering of the heavy-duty clamp through a lifting mechanism, and clamps and holds the cylindrical thin shell product through the heavy-duty clamp. The bottom of the base of the heavy-duty clamp has an arc-shaped clamping plate, and a pair of clamping claws with matching shapes are symmetrically connected on both sides of the arc-shaped clamping plate. The upper ends of the two clamping claws are respectively hinged with power devices, so that the arc-shaped clamping plate passes through a sliding track as a clamping claw, and the operation of clamping and releasing the product can be realized by pushing and pulling the clamping claws by the two power devices. The two clamping claws can slide along the arc-shaped clamping plate at the bottom of the base, so that the clamping claws can almost slide along the outer wall of the cylindrical thin shell to the maximum covering clamping position, thereby providing a guarantee for the safe and stable lifting and transportation of the cylindrical thin shell. Since the clamping claws can slide along the outer wall of the cylindrical thin shell, the clamp can clamp and hold the cylindrical thin shell under very small space clearance conditions. The lifting mechanism of the present invention is provided with a guide cylinder so that the entire lifting mechanism is formed into a rigid mechanism that can be stably lifted and lowered, which can ensure safety and stability during the lifting process. By fixing the device on conventional lifting equipment such as a crane or a crane, the cylindrical thin shell can be automatically transported to a designated location. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of an embodiment of the present invention.

[0025] Figure 2 for Figure 1 AA schematic diagram in .

[0026] Figure 3 for Figure 1 Enlarged schematic diagram of the medium and heavy-duty fixture.

[0027] Figure 4 for Figure 2 Enlarged schematic diagram of the medium and heavy-duty fixture.

[0028] Figure 5 for Figure 4 Schematic diagram of the CC amplification structure.

[0029] Figure 6 for Figure 4 Schematic diagram of the three-dimensional structure of the radial connecting plate.

[0030] Figure 7 for Figure 4 Schematic diagram of the three-dimensional structure of the central axial connecting plate.

[0031] Figure 8 for Figure 4 Schematic diagram of the three-dimensional structure of the middle clamp.

[0032] Fig. 9 for Figure 4Schematic diagram of the three-dimensional structure of the middle base.

[0033] Fig.10 for Figure 4 Schematic diagram of the 3D structure of medium and heavy-duty fixtures.

[0034] Fig.11 for Figure 1 Schematic diagram of the three-dimensional structure of the lifting mechanism. DETAILED DESCRIPTION

[0035] Combination Figures 1 to 11 It can be seen that the automatic lifting device disclosed in this embodiment, which is suitable for transporting cylindrical thin shells, includes a heavy-duty clamp 1, a lifting mechanism 2 and a connecting seat 3 therebetween.

[0036] The heavy-duty clamp 1 mainly includes a base 11, a clamping jaw 12 and a cylinder 13. The base 11 is a rectangular frame structure, the clamping jaw 12 is an arc-shaped plate clamping jaw, a pair of clamping jaws 12 are symmetrically connected to the bottom of the base 11 about the center plane of the length direction of the base 11, and two cylinders 13 are arranged obliquely, their cylinder ends are hinged on the base 11, and their piston rod ends are respectively hinged on the clamping jaws 12. The expansion and contraction of the piston rod of the cylinder 13 drives the clamping jaws to slide along the slide rail at the bottom of the base 1, so as to realize the operation of clamping and releasing the product.

[0037] Combination Figures 1 to 11 It can be seen that the base 11 includes a radial connecting plate 111 , an axial connecting plate 112 , a top enclosure plate 113 and a reinforcing support rod 114 .

[0038] The two radial connecting plates 111 are arranged symmetrically front and rear, and the two axial connecting plates 112 are symmetrically connected to the bottom of the two ends of the radial connecting plates 111 on the left and right. The front and rear sides of the top enclosure 113 are respectively connected to the two radial connecting plates 111, and the left and right sides are respectively connected to the left and right tops of the radial connecting plates 111.

[0039] The radial connecting plate 111 includes a rectangular plate 1111 and an arc-shaped clamping plate 1112. The rectangular plate 1111 is arranged vertically, and its lower bottom edge has an upper concave arc-shaped groove symmetrical with respect to the center plane in its length direction. The arc-shaped clamping plate is connected to the groove surface of the upper concave arc-shaped groove, and the inner side of the arc-shaped clamping plate 1112 extends out of the inner side of the rectangular plate 1111, and limiting bosses 11121 are symmetrically arranged at both ends of the extended section.

[0040] The axial ends of the clamping jaw 12 are symmetrically provided with thinning sections 121, the upper side of the clamping jaw 12 is provided with a U-shaped groove along its axial direction, and the two ends of the U-shaped groove are provided with bosses 122 matching the limiting bosses. The inner arc surface of the thinning section is the contour surface of the upper surface of the arc clamping plate 1112.

[0041] The inner surface of the clamping jaw 12 is attached with an elastic buffer plate 123. The outer surface of the elastic buffer plate 123 is covered with a tetrafluoroethylene material or a plate with a friction coefficient lower than that of the tetrafluoroethylene material to prevent excessive shear stress from damaging the heat-resistant coating on the surface of the product when the clamping jaw clamps the product.

[0042] The inner surface of the thinned section of the clamping jaw 12 is fitted with the outer surface of the extended section of the arc-shaped clamping plate 1112 at the bottom of the radial connecting plate 111. When the boss 122 on the upper side of the clamping jaw contacts the limiting bosses 11121 at both ends of the arc-shaped clamping plate 1112, the clamping jaw 12 is in the lower limit position. The setting of the limiting bosses 11121 at the ends of the arc-shaped clamping plate 1112 can prevent the clamping jaw 12 from derailing when sliding, and can also play a role in bearing weight.

[0043] In order to ensure better stability during product lifting, when the clamping jaws are at the lower limit position, the central angle between the lower side of the two clamping jaws and the center of the clamping circle is less than 90 degrees.

[0044] The inner surface of the axial connecting plate 112 is a contoured surface of the outer surface of the clamping jaw 12 . The axial connecting plate 112 and the radial connecting plate 111 are connected to form a sliding groove of the clamping jaw 12 .

[0045] A pair of ear plates EB are respectively arranged at the middle of the length direction of the U-shaped groove on the upper side of the clamping jaws on both sides, and the ear plates on the two clamping jaws are symmetrically arranged with respect to the center plane of the length direction of the clamping jaw 12 .

[0046] The top enclosure 113 of the base 11 includes two inverted V-shaped plates 1131 and an I-shaped plate 1132 connected between the two inverted V-shaped plates. The top of the inverted V-shaped plate is a horizontal transition edge. The two inverted V-shaped plates are connected to the tops of both ends of the two radial connecting plates 111. The top plate of the I-shaped plate is flush with the top edge of the inverted V-shaped plate, and the outer edges of the two horizontal side plates are flush with the upper edges of the radial connecting plates 111.

[0047] A pair of ear plates EB are respectively arranged in the middle of the U-shaped groove on the upper side of the two clamping jaws 12, and the two pairs of ear plates are symmetrically arranged about the center plane in the length direction of the clamping jaws. Two pairs of ear plates EB are arranged on both sides of the center plane in the length direction of the top plate of the "X"-shaped plate 1132, and their lateral positions correspond to the positions of the ear plates on the two clamping jaws 12.

[0048] The cylinder ends of the two oil cylinders 13 are respectively hinged to the ear plates on the top enclosure through pins, and the piston rod ends are respectively hinged to the ear plates in the middle of the U-shaped groove on the upper side of the clamping jaws 12 through pins. The inner sides of the two axial connecting plates 112 are provided with piston rod travel grooves 1121 at positions corresponding to the oil cylinder piston rods.

[0049] Reinforcement struts 114 are symmetrically connected to the top ends between the two radial connection plates 111 , and the reinforcement struts 114 are respectively located outside the piston rods of the corresponding side cylinders 13 .

[0050] After the heavy-duty clamp of this embodiment is assembled, the arc-shaped clamping plate 1112 at the bottom of the base 11 and the two clamping claws 12 symmetrically connected to the bottom of the base 11 form a circumferentially retractable holding structure.

[0051] The lifting mechanism 2 includes a guide cylinder 21 and a multi-stage lifting cylinder 22 .

[0052] The guide cylinder 21 includes multiple layers of concentrically mounted cylinders 211 that can slide relative to each other, and a lining plate 212 made of non-metallic material is arranged between adjacent cylinders.

[0053] The cross-section of the cylinder 211 in this embodiment is square, and except for the innermost cylinder, the inner walls of the other cylinders are all attached with lining plates. After the cylinders are assembled, they can slide relatively smoothly, so the matching size of each cylinder should be well controlled.

[0054] A pair of ear plates are symmetrically arranged on the bottom of the innermost cylinder body about its axial center plane, and pin shafts are connected to the two ear plates. A circular flange plate is arranged at the lower end of the innermost cylinder body.

[0055] The multi-stage lifting cylinder 22 is arranged vertically with the cylinder end facing upward at the center of the innermost cylinder of the guide cylinder, and the base plate at the upper end of the cylinder is connected to the upper end of the outermost cylinder, and the lower end of the piston rod is hinged on the pin shaft between the ear plates at the bottom of the innermost cylinder.

[0056] The number of stages of the multi-stage lifting cylinder 22 is the same as the number of layers of the guide cylinder body, and the relative sliding distance between each layer of the cylinder body matches the stroke of each layer of the piston rod of the multi-stage lifting cylinder, so that each layer of the cylinder body guides the lifting and lowering of each layer of the piston rod, thereby ensuring the stability of the entire lifting process of the multi-stage lifting cylinder.

[0057] The connecting seat 3 is an I-shaped seat, the lower end of which is connected to the horizontal plates on both sides of the "J"-shaped plate of the top enclosure of the base, and the upper end is butted with the flange plate at the lower end of the innermost cylinder of the guide cylinder.

[0058] After the lifting mechanism and the heavy fixture are assembled, the axial center line of the multi-stage lifting cylinder is collinear with the vertical center line of the heavy fixture.

[0059] The setting of the liner can not only ensure stable guidance, but also avoid wear between the cylinders.

[0060] The following takes the example of a crane used in lifting equipment to illustrate the specific application of this device.

[0061] The base plate at the upper end of the multi-stage lifting cylinder of the device is fixed on the crossbeam of the crane. The installation quantity of the device is determined according to the weight of the cylindrical thin shell product to be transported.

[0062] When the device is installed on the crane, the piston rods of the multi-stage lifting cylinder and the push-pull cylinder are in a retracted state, and the lowest point of the clamping jaws is above the horizontal maximum diameter cross section of the circumference of the clamping jaws.

[0063] The specific transportation process of the product is as follows:

[0064] The crane crossbeam moves to the top of the product to be transferred, so that the clamping center of the two clamping jaws is located on the axial center plane of the corresponding vertical surface of the product;

[0065] The piston rod of the multi-stage lifting cylinder is pushed out step by step, so that the heavy clamp moves down until the lower side of the two clamping jaws is 10-15mm away from the outer surface of the product to be clamped;

[0066] The piston rod of the push-pull oil cylinder is pushed out, and the clamping jaw slides downward under the action of the piston rod until the boss on the upper side of the clamping jaw contacts and is limited by the limiting boss at the bottom of the base. At this time, the arc-shaped clamping plate and the clamping jaw wrap and hold the cylindrical thin shell tightly;

[0067] The piston rod of the lifting cylinder of the lifting mechanism is retracted step by step, so that the heavy clamp holds the cylindrical thin shell and rises to a specified height;

[0068] The crane crossbeam moves to transport the products to the designated location.

[0069] The two clamping jaws of the present invention can slide along the arc-shaped clamping plate at the bottom of the base, so that the clamping jaws can slide along the outer wall of the cylindrical thin shell to the maximum covering clamping position, thereby providing a guarantee for the safe and stable lifting and transportation of the cylindrical thin shell. Since the clamping jaws can slide along the outer wall of the cylindrical thin shell, the clamp can clamp and hold the cylindrical thin shell under very small space gap conditions. The guide cylinder of the lifting mechanism can ensure the safety and stability during the lifting process of the multi-stage lifting cylinder. Therefore, the device can realize the stable lifting of large cylindrical thin shells under narrow gap space conditions, so that conventional lifting equipment can transport large cylindrical thin shell products through the device.

Claims

1. An automatic lifting device suitable for transporting cylindrical thin shells, characterized in that: It includes a heavy-duty clamp and a lifting mechanism connected to its upper end; The heavy-duty clamp includes a base, a clamping jaw and a push-pull power device. The base has an arc-shaped clamping plate at the bottom. The shape of the clamping jaw matches the shape of the arc-shaped clamping body. A pair of clamping jaws are symmetrically connected to the base about the arc-shaped clamping plate. The upper ends of the two clamping jaws are respectively hinged with push-pull power devices. The arc-shaped clamping plate at the bottom of the base also serves as a slide rail when the clamping jaw moves. The push-pull power device pushes and pulls the clamping jaws to slide along the slide rail to achieve the operation of clamping and releasing the product. The lifting mechanism is a rigid mechanism, including a lifting power device and a guide cylinder. The lower end of the guide cylinder is fixed to the upper end of the base through a connecting seat. The lifting power device is concentrically connected to the guide cylinder in the guide cylinder, and the lifting and lowering of the heavy fixture is achieved through the lifting power device.

2. The automatic lifting device according to claim 1, characterized in that: The base is a rectangular frame structure, including a radial connecting plate, an axial connecting plate and a top enclosure. The two radial connecting plates are symmetrically arranged front to back, the two axial connecting plates are symmetrically connected to the bottom of the two ends of the radial connecting plates left to right, and the top enclosure connects the tops of the two radial connecting plates into a whole.

3. The automatic lifting device according to claim 2, characterized in that: The radial connecting plate includes a rectangular plate and the arc-shaped clamping plate. The rectangular plate is arranged vertically, and its lower bottom edge has an upper concave arc-shaped groove symmetrical with respect to the center plane in its length direction. The arc-shaped clamping plate is connected to the groove surface of the upper concave arc-shaped groove, and the inner side of the arc-shaped clamping plate extends out of the inner side of the rectangular plate. The two ends of the arc-shaped clamping plate also extend symmetrically with limited position bosses.

4. The automatic lifting device according to claim 3, characterized in that: The clamping jaws are symmetrically provided with thinning sections at both axial ends, the upper side of the clamping jaws is provided with a U-shaped groove along its axial direction, both ends of the U-shaped grooves are provided with bosses matching the limiting bosses, and the inner arc surface of the thinning section is a contoured surface on the upper surface of the arc-shaped clamping plate; a pair of ear plates are respectively provided in the middle of the U-shaped grooves on the upper sides of the two clamping jaws, and the two pairs of ear plates are symmetrically arranged with respect to the center plane in the length direction of the clamping jaws.

5. The automatic lifting device according to claim 4, characterized in that: The inner surface of the axial connecting plate has a contoured surface of the outer surface of the clamping claw, and the axial connecting plate is connected with the radial connecting plate to form a sliding groove of the clamping claw.

6. The automatic lifting device according to claim 4, characterized in that: The top enclosure plate includes two inverted V-shaped plates and an I-shaped plate connected between the two inverted V-shaped plates. The top of the inverted V-shaped plate is a horizontal transition edge. The two inverted V-shaped plates are connected to the tops of both ends of the two radial connecting plates. The top plate of the I-shaped plate is flush with the top edge of the inverted V-shaped plate, and the outer edges of the two horizontal side plates are flush with the upper edges of the radial connecting plates. Two pairs of ear plates are arranged on both sides of the center plane in the length direction of the top plate of the I-shaped plate, and their lateral positions correspond to the positions of the ear plates on the two clamps.

7. The automatic lifting device according to claim 6, characterized in that: The push-pull power device is a cylinder, whose cylinder end is hinged to the ear plate on the top enclosure through a pin, and the piston rod end is hinged to the ear plate in the middle of the U-shaped groove on the upper side of the clamp through a pin; the top two ends between the two radial connecting plates are symmetrically connected with reinforcing struts, which are respectively located on the outside of the piston rod of the corresponding side cylinder.

8. The automatic lifting device according to claim 7, characterized in that: The lifting power device is a multi-stage telescopic cylinder, and the guide cylinder includes multiple layers of concentrically mounted and relatively slidable cylinders. Non-metallic lining plates are arranged between adjacent cylinders, and a pair of ear plates are symmetrically arranged at the bottom of the innermost cylinder about its axial center plane. The piston rod head of the multi-stage telescopic cylinder is hinged with a pin connecting the two ear plates, and the base plate at the upper end of the cylinder body is connected to the upper end of the outermost cylinder of the guide cylinder.

9. The automatic lifting device according to claim 8, characterized in that: The number of cylinder layers of the guide cylinder is the same as the number of levels of the piston rod of the lifting power device. The lower end of the innermost cylinder of the guide cylinder is provided with a flange plate. The lower end of the connecting seat is connected to the I-shaped plate of the base enclosure, and the upper end is fixedly connected to the flange plate.

10. A method for transporting a cylindrical thin shell using the automatic lifting device of claim 8, comprising the following steps: (1) Fix the base plate at the upper end of the lifting cylinder of the lifting mechanism to the lifting equipment, and make the multi-stage piston rod of the lifting cylinder in the retracted state; (2) The piston rod of the push-pull cylinder of the heavy-duty clamp is retracted so that the two clamping jaws are in the retracted state; (3) Use the lifting equipment to move the device to the top of the cylindrical thin shell to be transported, and make the clamping center of the two clamping jaws located on the axial center plane of the corresponding vertical plane of the product; (4) Push out the multi-stage piston rod of the lifting cylinder step by step, so that the heavy clamp moves down until the lower side of the two clamping jaws is 10-15 mm away from the outer surface of the product to be clamped; (5) Push out the piston rod of the push-pull cylinder of the heavy-duty clamp, and the clamping jaws slide downward under the action of the piston rod until the boss on the upper side of the clamping jaws contacts and is limited by the limiting boss at the bottom of the base. At this time, the arc-shaped clamping plate and the clamping jaws wrap around the cylindrical thin shell; (6) The piston rod of the lifting cylinder of the lifting mechanism is retracted step by step, so that the heavy clamp holding the cylindrical thin shell is lifted; (7) The lifting equipment is in operation to transport the cylindrical thin shell to the designated location.

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