Flexible equipment multi-hoisting-point hoisting device and hoisting method

Abstract

The invention discloses a multi-lifting-point lifting device and method for flexible equipment in the technical field of large flexible equipment lifting, the lifting device comprises an upper-layer main lifting lug, a lower-layer main lifting lug and a tail-slipping lifting lug which are arranged in pairs, a main lifting appliance is connected with the upper-layer main lifting lug and the lower-layer main lifting lug, a tail-slipping lifting appliance is connected with the tail-slipping lifting lug, and the main lifting appliance comprises a balance beam. The high-position lifting rope and the reversing piece are hinged to the balance beam, the pulley is hinged to the reversing piece, a low-position lifting rope is arranged on the pulley, and the low-position lifting rope is connected with the upper-layer main lifting lug and the lower-layer main lifting lug through rope sleeves. The two pairs of main lifting lugs and the pair of tail-slipping lifting lugs are arranged on the flexible equipment, the span between lifting points is shortened, the bending moment borne by the equipment is reduced, the lifting process is more stable and safer through the pulley self-balancing assembly, the upper-layer main lifting lug and the lower-layer main lifting lug are located on the two sides of the center line of the flexible equipment, and a lifting rope, the lifting lugs and a rope sleeve are prevented from being twisted.

Description

Technical Field

[0001] The present invention relates to the field of large-scale flexible equipment hoisting, and in particular to a multi-hoisting-point hoisting device and a hoisting method for flexible equipment. Background Art

[0002] In the fields of petrochemicals, energy construction, etc., the overall hoisting construction of large flexible equipment (such as loop reactors, thin-walled towers, flare barrels, etc.) faces severe challenges. Traditional hoisting methods mainly have the following problems: First, the segmented lifting and aerial assembly method requires a large amount of high-altitude work, which has high safety risks and is not suitable for equipment with a jacketed cylinder. Second, although the multi-lifting point group lifting method can achieve overall lifting, the coordinated operation of multiple cranes is extremely difficult, synchronization is difficult to ensure, and there is a very high risk of overturning and loss of control. Third, the multi-lifting point lever lifting method using a boom solves the problems of overall lifting and partial group lifting, but the construction process is extremely cumbersome, with strict requirements on on-site space, and the early preparation of tools and equipment takes a long time, making it difficult to adapt to working conditions with tight schedules or limited sites.

[0003] In addition, existing methods generally fail to effectively control the flexural deformation of slender and flexible equipment during the lifting process, especially for jacketed equipment with extremely small gaps between the inner and outer cylinders. The above phenomenon is more obvious. When the equipment posture is adjusted, the lifting rope is prone to twisting and interfering with the equipment or the lifting lug, accompanied by a large dynamic load impact, which seriously affects the stability and safety of the lifting process. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-hanging-point lifting device and a lifting method for flexible equipment, which solves the problem of insufficient safety performance of existing lifting devices and methods when lifting large flexible equipment.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions: A multi-point lifting device for flexible equipment includes a sling and a lifting lug fixed on the outer wall of the flexible equipment, the lifting lugs are divided into an upper main lifting lug, a lower main lifting lug and a tail lifting lug arranged in pairs, the sling is divided into a main sling and a tail lifting lug, the main sling is connected to the upper main lifting lug and the lower main lifting lug, and the tail lifting lug is connected to the tail lifting lug.

[0006] The main sling includes a balance beam, a hinge seat fixed at both ends of the balance beam, an upper clamping ring hinged to the top of the hinge seat, a high-position lifting rope provided on one side of the upper clamping ring, a reversing member hinged to the bottom of the hinge seat, and a pulley hinged to the bottom of the reversing member, a low-position lifting rope is provided on the pulley, both ends of the low-position lifting rope are connected with a rope loop, and the low-position lifting rope is connected to the upper main lifting ear and the lower main lifting ear through the rope loop, and the upper main lifting ear and the lower main lifting ear are respectively located on both sides of the center line of the flexible device.

[0007] As a further optimization solution of the present invention, the reversing member consists of a lower snap ring and a reversing snap ring connected to the lower snap ring, the lower snap ring is hinged to the bottom of the hinge seat, and the pulley is hinged to the bottom of the reversing snap ring.

[0008] As a further optimization scheme of the present invention, the upper main lifting ear includes a connecting tube fixed on the outer wall of the flexible device, and a limiting ring fixed on the outer wall of the connecting tube. The structure of the lower main lifting ear is consistent with that of the upper main lifting ear. A limiting assembly is provided on the rope loop. The limiting assemblies on the rope loops at both ends of the low-position lifting rope are respectively clamped with the upper main lifting ear and the lower main lifting ear.

[0009] As a further optimization scheme of the present invention, the limiting assembly includes two sleeves that are symmetrical to each other and are mounted on the rope loop. A clamping block is fixed on each of the two sleeves. The clamping block is clamped on the outside of the limiting ring. A telescopic part is fixed between the two clamping blocks. When the two sleeves are closed and tightly attached to the connecting tube, they are spliced ​​to form a limiting arc surface, and the central angle of the limiting arc surface is greater than 180°.

[0010] As a further optimization solution of the present invention, a rope channel corresponding to the rope loop is provided on the inner side of the jacket, and an opening for the rope loop to pass through or out is provided on the lower side of the rope channel.

[0011] As a further optimization solution of the present invention, a telescopic adjustment member for adjusting the working state of the telescopic member is provided between the low-position lifting rope and the rope loop; the telescopic adjustment member is powered off when the rope loop is in a tensioned state, and is powered on when the rope loop is in a relaxed state.

[0012] As a further optimization scheme of the present invention, the telescopic adjustment part includes an outer shell and a connecting column slidably arranged at the bottom of the outer shell, a support tube is fixedly provided at the bottom of the outer shell, the connecting column passes through the support tube, a pressure plate is fixedly provided on the outside of the connecting column, the support tube is used to stop the pressure plate, a reset part is provided under the pressure plate, a controller and a conductive structure 1 connected to the controller are provided at the top of the outer shell, a conductive structure 2 is provided at the top of the connecting column, and the controller is powered on when the conductive structure 1 contacts the conductive structure 2.

[0013] As a further optimization scheme of the present invention, the outer shell includes shell one and shell two fixed to the bottom of the outer wall of shell one, the bottom of the inner wall of shell two protrudes inward to form a plurality of support blocks, and grooves are formed between adjacent support blocks. A bottom plate is provided on the inner side of shell two, and the outer periphery of the bottom plate protrudes outward to form a protrusion. The groove is used for the protrusion to pass through, and the support block is used to provide support for the protrusion.

[0014] As a further optimization solution of the present invention, a mounting tube is fixedly provided on the top wall of the shell, and the mounting tube is used to guide the connecting column and stop the pressure plate, and the conductive structure 2 is fixedly provided on the inner side of the mounting tube.

[0015] A multi-point hoisting method for flexible equipment, wherein the flexible equipment is a loop reactor, and the hoisting method comprises the following steps: Step 1: Calculate the center of gravity of the loop reactor according to the assembly drawing and the planned installation height of the loop reactor, and determine the machine models of the main hoist and auxiliary hoist; Step 2: Draw a force diagram based on the center of gravity position of the loop tube reactor and the proposed lifting points, and calculate the forces on the main lifting and auxiliary lifting in the initial lifting state according to the principle of static equilibrium. The proposed lifting points are divided into an upper main lifting point, a lower main lifting point, and a tail lifting point. The upper main lifting point and the lower main lifting point are respectively located on both sides of the center line of the loop tube reactor; Step 3, checking the strength of the loop tube reactor, calculating the bending moments of the tail lifting point and the upper main lifting point of the loop tube reactor, as well as the bending moments of the points between the tail lifting point and the upper main lifting point according to the bending moment calculation formula, and determining the maximum bending moment point of the loop tube reactor; Step 4: Calculate the deflection of the two cantilever ends of the outer cylinder of the loop reactor and the maximum deflection between the upper main lifting point and the tail lifting point to determine whether the proposed lifting point setting meets the lifting requirements; Step 5, welding the upper main lifting lug, lower main lifting lug and tail lifting lug at the upper main lifting point, lower main lifting point and tail lifting point of the loop reactor respectively, installing the main lifting fixture on the main lifting device, installing the tail lifting fixture on the auxiliary lifting device, connecting the main lifting fixture to the upper main lifting lug and the lower main lifting lug, and connecting the tail lifting fixture to the tail lifting lug; Step 6: The main hoist and the auxiliary hoist lift the loop tube reactor through the main hoist and the tail hoist respectively, adjust the angle of the loop tube reactor, rotate the loop tube reactor 90 degrees, and then hoist the loop tube reactor.

[0016] The beneficial effects of the present invention are: The present invention calculates bending moment and deflection and sets two pairs of main lifting eyes and one pair of tail lifting eyes on the flexible equipment to shorten the span between lifting points, reduce the slenderness ratio within the calculation unit, avoid excessive bending moment during the lifting process of the flexible equipment, and prevent damage to the flexible equipment. The reversing member, pulley and low-position lifting rope of the present invention form a pulley self-balancing assembly. The pulley self-balancing assembly is used to reduce the friction coefficient of the lifting rope and the dynamic load of the main hoist during the process of the flexible device rotating to a vertical state, thereby making the lifting process more stable and safe. The upper main lifting lug and the lower main lifting lug of the present invention are respectively located on both sides of the flexible device. When the flexible device is placed horizontally, the upper main lifting lug is installed at a position slightly below the center line of the loop tube reactor, and the lower main lifting lug is installed at a position slightly above the center line of the loop tube reactor, so as to prevent the low-position lifting rope from being twisted with the upper main lifting lug and the rope loop when the loop tube reactor is in a vertical or nearly vertical state. The present invention provides protection and position constraint for the rope loop through the limit component, and regulates the controllable state of the telescopic adjustment part through the tensioning state of the rope loop. After the verticality verification of the flexible equipment is completed, the driver suspends the rope loop, and the verification personnel regulates the limit component through the telescopic adjustment part to separate the rope loop from the lifting ear, and prevents the rope loop from being separated from the lifting ear in advance at high altitude due to the driver's misoperation before the verticality verification of the flexible equipment is passed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 Enlarged view of point B in the middle; Figure 4 It is a side view of the main spreader of the present invention; Figure 5 Schematic diagram of the structure of the limit assembly of the present invention; Figure 6 Schematic diagram of the internal structure of the jacket of the present invention; Figure 7 This is a schematic diagram of the disassembled structure of the tension detection component of the present invention; Figure 8 Schematic diagram of the internal structure of the tension detection assembly of the present invention; Figure 9 It is a structural schematic diagram of the tail lift sling of the present invention; In the figure: 1. Upper main lifting eye; 2. Lower main lifting eye; 3. Tail lifting eye; 4. Main lifting device; 5. Limit assembly; 6. Telescopic adjustment member; 11. Connecting tube; 12. Limiting ring; 41. Balance beam; 42. Hinge seat; 43. Upper clamping ring; 44. High-position lifting rope; 45. Reversing member; 46. Pulley; 47. Low-position lifting rope; 48. Rope loop; 51. Jacket; 52. Block; 53. Telescopic member; 54 , rope channel; 55, opening; 61, housing; 62, connecting column; 63, support tube; 64, pressure plate; 65, reset member; 66, controller; 67, conductive structure one; 68, conductive structure two; 69, mounting tube; 451, lower retaining ring; 452, reversing retaining ring; 611, housing one; 612, housing two; 613, support block; 614, groove; 615, bottom plate; 616, protrusion. DETAILED DESCRIPTION

[0018] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0019] First embodiment As Figure 1-4 shown, the present embodiment relates to a flexible device multi-lifting point lifting device, which is used for lifting large flexible devices, and the present embodiment takes a loop reactor as an example, and the loop reactor is lifted by the cooperation of the main hoist and auxiliary hoist with the lifting device of the present embodiment, Figure 1 and Figure 4 The loop reactor shown in the figure is in the lifting stage, and the loop reactor is in a vertical state after a 90° rotation. It should be noted that in the initial stage of lifting the loop reactor, the loop reactor is placed horizontally on the ground assembly area. The lifting device comprises a lifting tool and a lifting lug fixed to the outer wall of the loop reactor. The lifting lug is divided into a pair of upper main lifting lugs 1, lower main lifting lugs 2 and tail lifting lugs 3. The lifting tool is divided into a main lifting tool 4 and a tail lifting tool. The main lifting tool 4 is connected with the upper main lifting lugs 1 and the lower main lifting lugs 2, and the main lifting tool 4 is installed on the main hoist. The tail lifting tool is connected with the tail lifting lugs 3, and the tail lifting tool is installed on the auxiliary hoist.

[0020] Specifically, the main lifting tool 4 of the lifting device comprises a circular tube-shaped balance beam 41, hinge shaft seats 42 fixed to both ends of the balance beam 41, an upper clasp ring 43 hinged to the top of the hinge shaft seat 42, a high lifting rope 44 provided on one side of the upper clasp ring 43, a reversing piece 45 hinged to the bottom of the hinge shaft seat 42, and a pulley 46 hinged to the bottom of the reversing piece 45. The pulley 46 is provided with a low lifting rope 47, the low lifting rope 47 passes through the pulley 46, and both ends of the low lifting rope 47 are connected with a rope sleeve 48. The low lifting rope 47 is connected with the upper main lifting lugs 1 and the lower main lifting lugs 2 on the same side of the loop reactor through the two rope sleeves 48, and the reversing piece 45, the pulley 46 and the low lifting rope 47 form a pulley self-balancing assembly. As Figure 2 shown, the reversing piece 45 is composed of a lower clasp ring 451 and a reversing clasp ring 452 connected with the lower clasp ring 451. The lower clasp ring 451 is hinged to the bottom of the hinge shaft seat 42, the reversing clasp ring 452 passes through the lower clasp ring 451, and the pulley 46 is hinged to the bottom of the reversing clasp ring 452. As Figure 3 shown, the upper main lifting lug 1 comprises a connecting cylinder 11 fixed to the outer wall of the loop reactor, and two limiting rings 12 fixed to the outer wall of the connecting cylinder 11. The structure of the lower main lifting lug 2 is consistent with that of the upper main lifting lug 1. In addition, the tail lifting lug 3 also has a connecting cylinder and a limiting ring fixed to the outer wall of the connecting cylinder.

[0021] The tail lifting tool also has a balance beam, a high lifting rope, a low lifting rope and a rope sleeve. The high lifting rope and the low lifting rope of the tail lifting tool are hinged to the balance beam, and the low lifting rope of the tail lifting tool is connected with the tail lifting lug 3 through the rope sleeve. As Figure 9As shown, the tail lift is not provided with a reversing member 45 and the limit assembly 5 and telescopic adjustment member 6 described below. The structure of the tail lift is basically the same as that of the main lift 4, so it will not be described in detail. In addition, in some other embodiments, the reversing member 45 can also be composed of an inverted U-shaped mounting frame and a lug fixed to the top of the mounting frame. Considering that when the loop tube reactor is hoisted, the low-level lifting rope 47 needs to go over the top of the loop tube reactor, in order to prevent the low-level lifting rope 47 from twisting with the rope loop 48, the upper main lifting lug 1 and the lower main lifting lug 2 are respectively welded to both sides of the center line of the loop tube reactor. When the loop tube reactor is placed horizontally, the installation position of the upper main lifting lug 1 is 150 mm below the center line of the loop tube reactor, and the installation position of the lower main lifting lug 2 is 150 mm above the center line of the loop tube reactor. The vertical spacing between the upper main lifting lug 1 and the lower main lifting lug 2 is 300 mm to prevent the low-position lifting rope 47 from being twisted with the upper main lifting lug 1 and the rope loop 48 when the loop reactor is in a vertical or nearly vertical state.

[0022] During the installation of the loop tube reactor, the two loops 48 on a low-level lifting rope 47 of the main lifting device 4 are connected to the upper main lifting lug 1 and the lower main lifting lug 2 on one side of the loop tube reactor, and the two loops 48 on another low-level lifting rope 47 of the main lifting device 4 are connected to the upper main lifting lug 1 and the lower main lifting lug 2 on the other side of the loop tube reactor. The main lifting device 4 is then installed on the main hoist, with the high-level lifting rope 44 connected to the main hoist's hook. The rope loop of the tail hoist is connected to the tail hoist's lifting lug 3, and the tail hoist is then installed on the auxiliary hoist, with the high-level lifting rope of the tail hoist connected to the auxiliary hoist's hook. Main hoisting and auxiliary hoisting cooperate main hoist 4 and tail hoist to pull upper strata main lifting ear 1, lower floor's main lifting ear 2 and tail hoist 3 upwards, by adjusting the output size of main hoisting and auxiliary hoisting, upper strata main lifting ear 1 is moved upwards relative to lower floor's main lifting ear 2 and tail hoist 3, loop tube reactor is rotated 90 °, makes loop tube reactor vertical to ground.When loop tube reactor is rotated to near vertical state, auxiliary hoist separates tail hoist and tail hoist 3 from each other.Afterwards in the hanging position, loop tube reactor is hung, after the loop tube reactor verticality check is completed, loop tube reactor is fixedly installed, completes the hoisting work of loop tube reactor.In addition, this hoisting device is not only applicable to the whole process of construction that large-scale loop tube reactor ground is assembled into piece hoisting, and is applicable to the integral hoisting of small-diameter thin-walled tower equipment, chimney and flare barrel, and is also applicable to some larger steel structures in piece or modular hoisting of slenderness.

[0023] Further, such as Figure 5 and Figure 6As shown, the rope sleeve 48 is provided with a limiting assembly 5, and the limiting assembly 5 on the two ends of the low-position hoisting rope 47 is respectively clamped with the upper main lifting lug 1 and the lower main lifting lug 2. The limiting assembly 5 includes two clamping sleeves 51 which are symmetrically sleeved on the rope sleeve 48, and each of the two clamping sleeves 51 is fixedly provided with a clamping block 52. The clamping sleeve 51 is clamped between the two limiting rings 12 on the connecting cylinder 11, the clamping block 52 is clamped on the outer side of the limiting ring 12 away from the loop reactor on the connecting cylinder 11, and the two clamping blocks 52 are fixedly provided with an extension piece 53. In the embodiment, the extension piece 53 is preferably an electric push rod. In addition, in some other embodiments, the electric push rod can also be replaced by a gas cylinder, an oil cylinder or other components with extension capability. When the two clamping sleeves 51 are combined and tightly attached to the connecting cylinder 11, a limiting arc surface is formed, the central angle of the limiting arc surface is greater than 180°, so that the two clamping sleeves 51 can position the rope sleeve 48 near the connecting cylinder 11. The inner side of the clamping sleeve 51 is provided with a rope channel 54 corresponding to the rope sleeve 48, and the lower side of the rope channel 54 is provided with an opening 55 for the rope sleeve 48 to pass in or out. The low-position hoisting rope 47 and the rope sleeve 48 are provided with an extension adjusting piece 6 for adjusting the working state of the extension piece 53; the extension adjusting piece 6 is de-energized when the rope sleeve 48 is in a tension state, and is energized when the rope sleeve 48 is in a relaxed state.

[0024] As Figure 7 and Figure 8As shown, the telescopic adjustment member 6 includes a shell 61 and a connecting column 62 slidably arranged at the bottom of the shell 61. A support tube 63 is fixedly provided at the bottom of the shell 61. The connecting column 62 passes through the support tube 63. A pressure plate 64 is fixedly provided on the outside of the connecting column 62. The support tube 63 is used to stop the pressure plate 64. A reset member 65 is provided under the pressure plate 64. A controller 66 and a conductive structure 1 67 connected to the controller 66 are provided at the top of the shell 61. A conductive structure 2 68 is provided at the top of the connecting column 62. When the conductive structure 1 67 contacts the conductive structure 2 68, the controller 66 is powered on. The housing 61 comprises a first housing 611 and a second housing 612 fixed to the bottom of the outer wall of the first housing 611. The bottom of the inner wall of the second housing 612 protrudes inward to form multiple support blocks 613, with grooves 614 formed between adjacent support blocks 613. A bottom plate 615 is provided on the inside of the second housing 612, with protrusions 616 protruding outward from the outer periphery of the bottom plate 615. The grooves 614 are for the protrusions 616 to pass through, and the support blocks 613 provide support for the protrusions 616. The interior of the second housing 612 is hollow, and the bottom plate 615 can enter the second housing 612 through a port at the bottom of the second housing 612. The sidewall of the second housing 612 is connected to the protrusions 616 via threaded fasteners. The reset member 65 is preferably a spring, with its ends abutting the pressure plate 64 and the bottom plate 615, respectively. A mounting tube 69 is fixed to the bottom of the top wall of the first housing 611. The top of the connecting column 62 is truncated cone-shaped, and the inside of the mounting tube 69 forms a guide groove corresponding to the top of the connecting column 62. The mounting tube 69 is used to guide the connecting column 62 and stop the pressure plate 64. The conductive structure 1 67 is fixed on the inner side of the mounting tube 69. The conductive structure 1 67 is in the shape of a circular tube, and the conductive structure 2 68 is in the shape of a cylinder. A battery connected to the conductive structure 2 68 is fixed on the top of the pressure plate 64. When the conductive structure 2 68 is embedded in the conductive structure 1 67, the battery supplies power to the controller 66.

[0025] In order to provide protection for the rope loop 48 and prevent the rope loop 48 from being separated from the upper main lifting ear 1 or the lower main lifting ear 2 in advance due to improper operation of the main crane driver, a limit assembly 5 is set on the rope loop 48, and the tension of the rope loop 48 is detected by the telescopic adjustment member 6. When the rope loop 48 is in a relaxed state, the controller 66 can adjust the telescopic state of the telescopic member 53. The lifting device also has a remote control. After the verticality of the annular tube reactor is checked and passed, the checker cooperates with the main crane driver to control the main hoist 4 to keep the rope loop 48 away from the connecting tube 11.

[0026] During the lifting process, the telescopic member 53 is in a retracted state, and the pair of jackets 51 are tightly attached to each other and surround the connecting tube 11. The jackets 51 are located between the two limiting rings 12, and the clamping block 52 is engaged with the outside of one of the limiting rings 12. During the lifting and turning of the annular tube reactor, the jackets 51 can rotate around the axis of the connecting tube 11, but they always fit together with the connecting tube 11 to ensure that the rope loop 48 remains attached to the connecting tube 11. This prevents the rope loop 48 from being separated from the connecting tube 11 prematurely due to operator error before the annular tube reactor verticality is completed, and provides protection for the rope loop 48. The connecting column 62 on the rope loop 48 moves away from the installation tube 69 under the action of the gravity of the annular tube reactor, and the pressure plate 64 overcomes the elastic force of the reset member 65 to press the support tube 63 downward. The conductive structure 2 68 is separated from the conductive structure 1 67, and the controller 66 is in a power-off state. The verticality checker of the annular tube reactor cannot send control instructions to the controller 66 through the remote control at this time, preventing the telescopic member 53 from being incorrectly controlled when the rope loop 48 is in a tensioned state, and can avoid damage to the rope loop 48 due to premature stretching of the telescopic member 53.

[0027] After the verticality check of the annular tube reactor is completed, the main crane operator controls the main crane and lowers the main sling 4, so that the rope loop 48 is in a relaxed state. At this time, the reset member 65 pushes the pressure plate 64 upward, which drives the connecting column 62 upward, so that the conductive structure 2 68 on the connecting column 62 is embedded in the conductive structure 1 67, and the controller 66 is in an energized state. The operator then sends a control command to the controller 66 via the remote control. The controller 66 stretches the telescopic member 53, and the pair of jackets 51 move away from each other. At this time, the jackets 51 are separated from the connecting tube 11. The operator of the main crane can control the main crane to move the rope loop 48 away from the connecting tube 11, avoiding the risk of the rope loop 48 prematurely separating from the connecting tube 11 at high altitude, making it difficult to adjust the angle of the annular tube reactor through the main sling 4.

[0028] The housing 61 of the telescopic adjustment member 6 consists of a first housing 611, a second housing 612, and a base plate 615. To install the housing 61, align the protrusion 616 on the base plate 615 with the groove 614. Insert the base plate 615 from the bottom end of the second housing 612, with the protrusion 616 passing through the groove 614. Then, rotate the base plate 615 so that the protrusion 616 overlaps the support block 613. Bolts secure the protrusion 616 to the sidewall of the second housing 612. The housing 61 is a split housing, and the bottom plate 615 of the housing 61 is connected to the second housing 612 by a rotating snap-fit ​​connection. The protrusion 616 of the bottom plate 615 is supported by a support block 613. The top of the protrusion 616 is aligned with the top wall of the second housing 612, and the protrusion 616 is located between the side walls of the first housing 611 and the side walls of the second housing 612. The side walls of the second housing 612 are connected to the protrusion 616 by threaded fasteners. While ensuring that the housing 61 is removable and that the reset member 65 can be checked and replaced, the overall structure of the telescopic adjustment member 6 is secure and reliable, and can adapt to the lifting operation of large-scale annular reactors. The bottom of the jacket 51 is provided with an opening 55 connected to the rope channel 54, which facilitates the adjustment of the relative position of the rope loop 48 and the jacket 51.

[0029] Second embodiment This embodiment relates to a multi-hanging point hoisting method for flexible equipment, which is applicable to the hoisting device of the previous embodiment. The hoisting method specifically includes the following steps: Step 1: Calculate the center of gravity of the loop tube reactor according to the assembly drawing of the loop tube reactor. Preliminarily determine the mechanical models of the main hoist and auxiliary hoist according to the weight, overall dimensions and planned installation height of the loop tube reactor.

[0030] Step 2: Based on the center of gravity position of the loop tube reactor and the proposed lifting points, a force diagram is drawn. The forces acting on the main and auxiliary lifting devices in the initial lifting state are calculated according to the principle of static equilibrium. The proposed lifting points are divided into an upper main lifting point, a lower main lifting point, and a tail lifting point. The upper main lifting point and the lower main lifting point are located on both sides of the center line of the loop tube reactor respectively. Step 3: Verify the strength of the loop reactor. Using the bending moment calculation formula, calculate the bending moments at the tail lifting point and the upper main lifting point, as well as the bending moments at each point between the tail lifting point and the upper main lifting point, to determine the point of maximum bending moment for the loop reactor. Because the bending moment is greatest at the initial lifting of the loop reactor and gradually decreases as the lifting angle increases, following a cosine function, only the initial position of the large section is verified. Calculate the section modulus and cross-sectional strength stress at the point of maximum bending moment to determine if the loop reactor's inherent strength is safe during lifting.

[0031] Step 4. Calculate the deflection of the two cantilever ends of the outer cylinder of the loop tube reactor, as well as the maximum deflection between the upper main lifting point and the tail lifting point, to determine whether the proposed lifting point setting meets the lifting requirements. Since the loop tube reactor is a jacketed cylinder, and the gap between the inner cylinder positioning plate and the outer cylinder is only 5mm, in order to ensure the safety of the inner cylinder, the moment of inertia of the section is only calculated for the outer cylinder of the loop tube reactor when calculating the deflection. In addition, before hoisting the loop tube reactor, it is necessary to harden the site of the ground assembly area of ​​the loop tube reactor, calculate the endurance of the equipment hoisting area, and treat the foundation to ensure that the equipment hoisting process will not affect the hoisting safety due to foundation sinking.

[0032] Step 5. Determine the final position of each lifting point through the above calculations, and calculate the force of each lifting lug. Referring to HGT21574-2018 "Design and Selection Specifications for Lifting Lugs for Chemical Equipment", select four AXC-8 type lifting lugs as the upper main lifting lug 1 and the lower main lifting lug 2, and select two AXB-5 type lifting lugs as the tail lifting lugs 3.

[0033] During the installation of the lifting lugs, considering that the low-level lifting rope 47 needs to go over the top of the loop tube reactor when the loop tube reactor is hoisted, in order to prevent the low-level lifting rope 47 from twisting with the rope loop 48, the upper main lifting lug 1 and the lower main lifting lug 2 are welded to both sides of the center line of the loop tube reactor. When the loop tube reactor is placed horizontally, the upper main lifting lug 1 is installed 150 mm below the center line of the loop tube reactor, and the lower main lifting lug 2 is installed 150 mm above the center line of the loop tube reactor. The vertical spacing between the upper main lifting lug 1 and the lower main lifting lug 2 is 300 mm to prevent the low-level lifting rope 47 from twisting with the upper main lifting lug 1 and the rope loop 48 when the loop tube reactor is vertical or nearly vertical.

[0034] Step 6: Connect the two loops 48 on one low-level lifting rope 47 of the main lifting device 4 to the upper main lifting lug 1 and lower main lifting lug 2 on one side of the loop tube reactor. Connect the two loops 48 on the other low-level lifting rope 47 of the main lifting device 4 to the upper main lifting lug 1 and lower main lifting lug 2 on the other side of the loop tube reactor. Install the main lifting device 4 on the main hoist, and connect the high-level lifting rope 44 to the main hoist's hook. Connect the loop of the tail hoist to the tail hoist's lifting lug 3, and install the tail hoist on the auxiliary hoist, connecting the high-level lifting rope of the tail hoist to the auxiliary hoist's hook.

[0035] The main hoist and the auxiliary hoist cooperate with the main hoist 4 and the tail hoist to pull the upper main hoisting ear 1, the lower main hoisting ear 2 and the tail hoisting ear 3 upwards. By adjusting the output of the main hoist and the auxiliary hoist, the upper main hoisting ear 1 moves upward relative to the lower main hoisting ear 2 and the tail hoisting ear 3, and the annular tube reactor is rotated 90° so that the annular tube reactor is perpendicular to the ground. Then, the annular tube reactor is hoisted at the hoisting position. After the verticality verification of the annular tube reactor is completed, the annular tube reactor is fixed and installed to complete the hoisting work of the annular tube reactor.

[0036] In addition, in order to reduce the friction between the low-position lifting rope 47 and the clamping ring shaft during the uprighting process of the equipment, a pulley 46 is set at the bottom of the reversing clamping ring 452. The verticality and horizontality of the annular tube reactor can be automatically adjusted by rotating the pulley 46, thereby reducing the dynamic load of the main hoist and making the lifting process smoother and safer.

[0037] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A multi-point lifting device for flexible equipment, comprising a lifting device and a lifting lug fixed on the outer wall of the flexible equipment, characterized in that: The lifting lugs are divided into upper main lifting lugs (1), lower main lifting lugs (2) and tail lifting lugs (3) arranged in pairs, and the slings are divided into main slings (4) and tail lifting lugs, the main slings (4) are connected to the upper main lifting lugs (1) and the lower main lifting lugs (2), and the tail lifting lugs are connected to the tail lifting lugs (3); The main sling (4) includes a balance beam (41), hinged shaft seats (42) fixed at both ends of the balance beam (41), an upper clamping ring (43) hinged to the top of the hinged shaft seat (42), a high-position lifting rope (44) provided on one side of the upper clamping ring (43), a reversing member (45) hinged to the bottom of the hinged shaft seat (42), and a pulley (46) hinged to the bottom of the reversing member (45), a low-position lifting rope (47) is provided on the pulley (46), both ends of the low-position lifting rope (47) are connected to a rope loop (48), and the low-position lifting rope (47) is connected to the upper main lifting lug (1) and the lower main lifting lug (2) through the rope loop (48), and the upper main lifting lug (1) and the lower main lifting lug (2) are respectively located on both sides of the center line of the flexible device.

2. The hoisting device according to claim 1, characterized in that: The reversing member (45) is composed of a lower snap ring (451) and a reversing snap ring (452) connected to the lower snap ring (451). The lower snap ring (451) is hinged to the bottom of the hinge seat (42), and the pulley (46) is hinged to the bottom of the reversing snap ring (452).

3. The hoisting device according to claim 1, characterized in that: The upper main lifting lug (1) includes a connecting tube (11) fixed on the outer wall of the flexible device, and a limiting ring (12) fixed on the outer wall of the connecting tube (11). The structure of the lower main lifting lug (2) is consistent with that of the upper main lifting lug (1). A limiting component (5) is provided on the rope loop (48). The limiting components (5) on the rope loops (48) at both ends of the low-position lifting rope (47) are respectively connected to the upper main lifting lug (1) and the lower main lifting lug (2).

4. The hoisting device according to claim 3, characterized in that: The limiting assembly (5) comprises two symmetrical jackets (51) sleeved on the rope loop (48), each of the two jackets (51) being fixed with a clamping block (52), the clamping block (52) being clamped on the outside of the limiting ring (12), a telescopic member (53) being fixed between the two clamping blocks (52), and a limiting arc surface being formed when the two jackets (51) are closed and tightly attached to the connecting tube (11), and the central angle of the limiting arc surface is greater than 180°.

5. The hoisting device according to claim 4, characterized in that: A rope channel (54) corresponding to the rope loop (48) is provided on the inner side of the jacket (51), and an opening (55) for the rope loop (48) to pass through or out is provided on the lower side of the rope channel (54).

6. The hoisting device according to claim 4, characterized in that: A telescopic adjustment member (6) for adjusting the working state of the telescopic member (53) is provided between the low-position lifting rope (47) and the rope loop (48); the telescopic adjustment member (6) is powered off when the rope loop (48) is in a tensioned state, and powered on when the rope loop (48) is in a relaxed state.

7. The hoisting device according to claim 1, characterized in that: The telescopic adjustment member (6) includes a shell (61) and a connecting column (62) slidably arranged at the bottom of the shell (61), a support tube (63) is fixedly provided at the bottom of the shell (61), the connecting column (62) passes through the support tube (63), a pressure plate (64) is fixedly provided on the outside of the connecting column (62), the support tube (63) is used to stop the pressure plate (64), a reset member (65) is provided below the pressure plate (64), a controller (66) and a conductive structure (67) connected to the controller (66) are provided at the top of the shell (61), a conductive structure (68) is provided at the top of the connecting column (62), and the controller (66) is powered on when the conductive structure (67) contacts the conductive structure (68).

8. The hoisting device according to claim 7, characterized in that: The shell (61) includes a shell one (611) and a shell two (612) fixed to the bottom of the outer wall of the shell one (611), the bottom of the inner wall of the shell two (612) protrudes inward to form a plurality of support blocks (613), and grooves (614) are formed between adjacent support blocks (613). A bottom plate (615) is provided on the inner side of the shell two (612), and the outer periphery of the bottom plate (615) protrudes outward to form a protrusion (616), the groove (614) is used for the protrusion (616) to pass through, and the support block (613) is used to provide support for the protrusion (616).

9. The hoisting device according to claim 8, characterized in that: A mounting tube (69) is fixedly provided on the top wall of the housing 1 (611), and the mounting tube (69) is used to guide the connecting column (62) and stop the pressure plate (64). The conductive structure 2 (68) is fixedly provided on the inner side of the mounting tube (69).

10. A multi-point hoisting method for a flexible device, wherein the flexible device is a loop reactor, characterized in that: The hoisting method is based on the hoisting device according to any one of claims 1 to 9, and the hoisting method comprises the following steps: Step 1: Calculate the center of gravity of the loop reactor according to the assembly drawing and the planned installation height of the loop reactor, and determine the machine models of the main hoist and auxiliary hoist; Step 2: Draw a force diagram based on the center of gravity position of the loop tube reactor and the proposed lifting points, and calculate the forces on the main lifting and auxiliary lifting in the initial lifting state according to the principle of static equilibrium. The proposed lifting points are divided into an upper main lifting point, a lower main lifting point, and a tail lifting point. The upper main lifting point and the lower main lifting point are respectively located on both sides of the center line of the loop tube reactor; Step 3, checking the strength of the loop tube reactor, calculating the bending moments of the tail lifting point and the upper main lifting point of the loop tube reactor, as well as the bending moments of the points between the tail lifting point and the upper main lifting point according to the bending moment calculation formula, and determining the maximum bending moment point of the loop tube reactor; Step 4: Calculate the deflection of the two cantilever ends of the outer cylinder of the loop reactor and the maximum deflection between the upper main lifting point and the tail lifting point to determine whether the proposed lifting point setting meets the lifting requirements; Step 5, welding the upper main lifting lug (1), the lower main lifting lug (2) and the tail lifting lug (3) at the upper main lifting point, the lower main lifting point and the tail lifting point of the loop tube reactor respectively, installing the main lifting device (4) on the main lifting device, installing the tail lifting device on the auxiliary lifting device, connecting the main lifting device (4) with the upper main lifting lug (1) and the lower main lifting lug (2), and connecting the tail lifting device with the tail lifting lug (3); Step 6: The main hoist and the auxiliary hoist lift the loop tube reactor through the main hoist (4) and the tail hoist respectively, and adjust the angle of the loop tube reactor to rotate the loop tube reactor 90 degrees, and then lift the loop tube reactor.

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