A lifting device for blind flanges

Abstract

The application discloses a hoisting device for blind flanges and relates to the hoisting technical field. In view of the problem that the existing blind flanges cannot be automatically positioned to the bolt holes, the following scheme is provided. The hoisting device comprises a hoisting device and a clamping mechanism arranged at the bottom of the hoisting device. The hoisting device further comprises a rotating angle mechanism for rotating the buckle on the clamping mechanism to correspond to the bolt hole of the blind flange. The clamping mechanism comprises a buckle assembly clamped on the bolt hole of the blind flange and an identification system for identifying the positions of the four bolt holes of the blind flange. The identification system comprises a reference module, an identification module and a driving module. The hoisting device, the clamping mechanism and the identification system are used in cooperation, the clamping block is accurately positioned to the bolt hole of the blind flange, the hoisting efficiency is improved, the whole hoisting and unloading process can be completed by one person, and the practicability of the device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hoisting, in particular to a hoisting device for blind flange. BACKGROUND

[0002] The blind flange plate, also known as blind flange, is actually called blind plate. It is a connecting form of flange. It is actually a flange without hole in the middle. One of its functions is to block the end of the pipeline, and the other is to facilitate the removal of debris in the pipeline during maintenance. In terms of blocking effect, it has the same effect as the end cap and pipe cap. However, the end cap cannot be disassembled, while the blind flange plate is bolted and can be easily disassembled. The blind flange plate is made of carbon steel, alloy steel, stainless steel, plastic and other materials.

[0003] In the Chinese utility model patent with the publication number CN206569892U, a blind plate flange hoisting tool is disclosed, which comprises a magnetic lifting disc, a control wrench is arranged on the magnetic lifting disc, a horizontal lifting ring is fixed to the upper end of the magnetic lifting disc, and a vertical lifting ring, a lifting steel plate, a symmetrical synchronous telescopic device and an L-shaped bracket are further included.

[0004] According to the related technology in the above, the inventors believe that the following defects exist: Although the above prior art increases the adsorption contact surface of the hoisting tool and the blind plate flange by using the magnetic lifting disc, and the lower end of the lifting steel plate is provided with an L-shaped bracket, which can clamp the blind plate flange and is not easy to slip, but the magnetic lifting disc hoists the blind flange by attraction. In fact, when the blind flange is installed on the pipeline for a long time, it is easy to adhere to one end of the pipeline, which requires a relatively large force, making the hoisting unsafe, and the magnetic lifting disc also needs to be manually positioned, which cannot be automatically positioned, and is not convenient to use. Therefore, a hoisting device for blind flange is needed. SUMMARY

[0005] The hoisting device for blind flange provided by the present application solves the problem of not being able to automatically position the buckle to the blind flange bolt hole.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A lifting device for blind flange, comprising a lifting device and a clamping mechanism at the bottom of the lifting device, the lifting device comprises a cantilever frame and a guide cylinder sliding on the lower side of the cantilever frame, the lower end of the guide cylinder is slidingly connected with a lifting rack, the upper end of the lifting rack is fixedly connected with a compression spring fixedly connected with the upper end of the guide cylinder, one side of the guide cylinder is fixedly connected with a second servo motor, the output end of the second servo motor is fixedly connected with a second gear meshing with the lifting rack, the lower end of the lifting rack is connected with the clamping mechanism, the lifting device further comprises a rotation angle mechanism for rotating the buckle on the clamping mechanism corresponding to the bolt hole of the blind flange, the clamping mechanism comprises a buckle assembly clamped on the bolt hole of the blind flange and an identification system for identifying the position of the four bolt holes of the blind flange;

[0008] The identification system comprises a reference module, an identification module and a driving module; the clamping block is accurately positioned on the bolt hole of the blind flange by using the identification system in cooperation with the lifting device and the clamping mechanism, the lifting efficiency is improved, the whole lifting and unloading process can be completed by one person, and the practicability of the device is improved.

[0009] The reference module determines the center position of the blind flange through the image scanner at the bottom of the clamping mechanism, and the center of the clamping mechanism is on the same vertical line as the center of the blind flange, the clamping mechanism comprises a limiting assembly fixedly connected with the lower end of the lifting rack, and the limiting assembly is rotatably connected with upper and lower buckle assemblies and a rotation angle mechanism for driving the rotation angle of the two buckle assemblies, respectively;

[0010] The upper and lower buckle assemblies each comprise a fixed rod rotatably connected with a connecting column, both ends of the fixed rod are slidingly connected with a lifting rod, the lower end of the lifting rod is fixedly connected with a sleeve inserted into the lower side of the bolt hole of the blind flange, both sides of the sleeve are slidingly connected with clamping blocks abutting against the lower side of the bolt hole of the blind flange, one end of the clamping block is fixedly connected with a clamping spring fixedly connected with the inner side of the sleeve, the lower side of the clamping block is provided with an inclined upward inclined surface, and the inner side of the sleeve is provided with an unloading mechanism for pulling the clamping block into the inner side of the sleeve;

[0011] The identification module determines the number of bolt holes of the blind flange through the image scanner and obtains the included angle between two adjacent bolt holes through the computer, the position of the buckle is adjusted through the driving mechanism in the driving module, so that the center of the buckle is located on the straight line formed by the center of the blind flange and the center of the bolt hole, and the distance M between the center of the buckle and the center of the blind flange is obtained, the centers of the plurality of bolt holes are connected in sequence to form a circle, and the radius L of the circle is obtained, then the distance G of the buckle movement is L-M, so that the four buckles are on the same vertical line with the four bolt holes of the blind flange;

[0012] The driving module comprises a corner mechanism and a fixed rod, the corner mechanism comprises first servo motors fixedly connected with one side of the upper connecting plate and the lower connecting plate respectively, first gears are fixedly connected with the output ends of the two first servo motors, a gear ring is rotatably sleeved with the connecting column and fixedly connected with the middle of the fixed rod, sliding grooves are formed in the two ends of the fixed rod, second electric sliding blocks are slidably connected with the inner sides of the two sliding grooves and fixedly connected with the upper end of the suspender, and the driving module is used for adjusting the angle of the four buckles and adjusting the distance of the four buckles, so that the centers of the four buckles and the center of the blind flange bolt hole are on the same vertical line.

[0013] Preferably, the limiting assembly comprises an upper connecting plate fixedly connected with the lower end of the lifting rack, a connecting column and a lower connecting plate, and the connecting column is connected between the upper connecting plate and the lower connecting plate.

[0014] Preferably, the unloading mechanism comprises an unloading rod slidably connected with the lower side of the sleeve, a return spring fixedly connected with the inner side of the sleeve is fixedly connected with the upper end of the unloading rod, and a pull rope fixedly connected with one side of the clamping block is fixedly connected with the lower side of the unloading rod.

[0015] Preferably, the identification module comprises a first image scanner fixedly connected with the lower surface of the lower connecting plate and a second image scanner fixedly connected with the lower side of the plurality of second electric sliding blocks.

[0016] Preferably, one end of the cantilever frame is fixedly connected with an electric push rod, a first electric sliding block fixedly connected with the upper end of the guide cylinder is arranged on the electric push rod, the other end of the cantilever frame is provided with an electric turntable, and a connecting base is fixedly connected with the bottom of the electric turntable.

[0017] The beneficial effects of the present application are as follows:

[0018] 1. By means of the first image scanner and the plurality of second image scanners, the position of each bolt hole of the blind flange can be automatically identified, and the sleeve can be automatically inserted into the inner side of the blind flange bolt hole, so that the clamping block is clamped on the lower side of the bolt hole, without the need for manual insertion of the clamping block into the inner side of the bolt hole, thereby improving the automatic positioning effect and further improving the lifting efficiency of the blind flange, and the lifting of the blind flange can also be performed in some dangerous places where personnel cannot reach, thereby ensuring the safety of personnel. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a first overall schematic view of a blind flange lifting device according to the present application;

[0020] Figure 2 It is a second overall schematic view of a blind flange lifting device according to the present application;

[0021] Figure 3A third overall schematic view of a hoisting device for a blind flange according to the present application;

[0022] Figure 4 An enlarged schematic view of a clamping mechanism of a hoisting device for a blind flange according to the present application;

[0023] Figure 5 An enlarged schematic view of a cross section of a buckle assembly of a hoisting device for a blind flange according to the present application;

[0024] Figure 6 A Figure 1 An enlarged schematic view of A in the middle;

[0025] Figure 7 A flowchart of an identification system of a hoisting device for a blind flange according to the present application;

[0026] Figure 8 An initial position schematic view of a hoisting device for a blind flange according to the present application;

[0027] Figure 9 An schematic view of a hoisting device for a blind flange according to the present application, in which the center of the buckle is located on a straight line formed by the center of the blind flange and the center of the bolt hole.

[0028] In the figure, 1 is a cantilever frame, 2 is an electric push rod, 3 is a first electric sliding block, 4 is a compression spring, 5 is a lifting rack, 6 is a guide cylinder, 7 is an electric rotating disc, 8 is an upper connecting plate, 9 is a first image scanner, 10 is a lower connecting plate, 11 is a connecting base, 12 is a connecting column, 13 is a first servo motor, 14 is a first gear, 15 is a gear ring, 16 is a fixed rod, 17 is a second electric sliding block, 18 is a sliding groove, 19 is a second image scanner, 20 is a lifting rod, 21 is a clamping block, 22 is a clamping sleeve, 23 is a discharging rod, 24 is a clamping spring, 25 is a pull rope, 26 is a reset spring, 27 is a second servo motor, 28 is a second gear, 29 is a blind flange, and 30 is a bolt hole. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0030] Reference Figures 1-3A lifting device for blind flange, comprising a lifting device and a clamping mechanism at the bottom of the lifting device, the lifting device comprises a cantilever frame 1 and a guide cylinder 6 sliding at the lower side of the cantilever frame 1, the lower end of the guide cylinder 6 is slidingly connected with a lifting rack 5, the upper end of the lifting rack 5 is fixedly connected with a compression spring 4 fixedly connected with the upper end of the guide cylinder 6, one side of the guide cylinder 6 is fixedly connected with a second servo motor 27, the output end of the second servo motor 27 is fixedly connected with a second gear 28 engaged with the lifting rack 5, the lower end of the lifting rack 5 is connected with the clamping mechanism, the second servo motor 27 drives the second gear 28 to rotate, in turn drives the lifting rack 5 to slide at the lower side of the guide cylinder 6, in turn makes the clamping mechanism at the bottom of the lifting rack 5 lift, completes the lifting of the blind flange, the lifting device further comprises a rotation angle mechanism for rotating the buckle on the clamping mechanism corresponding to the bolt hole of the blind flange, the clamping mechanism comprises a buckle assembly clamped on the bolt hole of the blind flange and an identification system for identifying the position of the four bolt holes of the blind flange;

[0031] The identification system comprises a reference module, an identification module and a driving module.

[0032] The reference module determines the center position of the blind flange through the image scanner at the bottom of the clamping mechanism, and the center of the clamping mechanism and the center of the blind flange are on the same vertical line, at this time the point is recorded on the computer, the clamping mechanism comprises a limiting assembly fixedly connected with the lower end of the lifting rack 5, the limiting assembly is rotatably connected with upper and lower buckle assemblies and a rotation angle mechanism for driving the rotation angle of the two buckle assemblies, respectively, the position of the two buckle assemblies can be adjusted through the rotation angle mechanism, so that the two buckle assemblies correspond to the bolt hole of the blind flange, and automatic positioning and clamping are facilitated;

[0033] The upper and lower buckle assemblies each include a fixed rod 16 rotatably connected with the connecting column 12, both ends of the fixed rod 16 are slidably connected with a hanger rod 20, the lower end of the hanger rod 20 is fixedly connected with a sleeve 22 inserted into the lower side of the blind flange bolt hole, both sides of the sleeve 22 are slidably connected with a clamping block 21 abutting against the lower side of the blind flange bolt hole, one end of the clamping block 21 is fixedly connected with a clamping spring 24 fixedly connected with the inner side of the sleeve 22, the lower side of the clamping block 21 is provided with an inclined upward slope, the inner side of the sleeve 22 is provided with a discharging mechanism for pulling the clamping block 21 into the inner side of the sleeve 22, when the hanger rod moves above the corresponding blind flange bolt hole through the recognition module, the upper connecting plate 8, the connecting column 12 and the lower connecting plate 10 are lifted through the lifting rack 5, and then the fixed rod 16 and the hanger rod 20 are lifted, so that the hanger rod 20 drives the sleeve 22 at the lower end to be inserted into the inner side of the bolt hole, and the clamping block 21 is pressed through the bolt hole, so that the clamping spring 24 at one end of the clamping block 21 is compressed, when the clamping block 21 moves to the lower surface of the bolt hole, the clamping spring 24 restores the deformation, drives the clamping block 21 to be clamped into the lower side of the bolt hole, and then the sleeve is clamped on the blind flange bolt hole, the automatic positioning and hole insertion operation is completed, the positioning and hole insertion efficiency is improved, and the diameter of the sleeve 22 can be smaller than the diameter of the bolt hole, so that the blind flange with relatively large bolt holes can also be lifted, and the use range of the device is improved.

[0034] Referring to Figures 7-9 The recognition module determines the number of blind flange bolt holes through the image scanner and obtains the included angle a between two adjacent bolt holes through the computer, the included angle between two adjacent bolt holes is 360° / the number of bolt holes, the included angle between two fixed rods 16 in the initial state is β, the position of the buckle is adjusted through the driving mechanism in the driving module, so that the center of the buckle is located on the straight line formed by the center of the blind flange and the center of the bolt hole, the angle between the two fixed rods 16 in the initial state is adjusted through the rotation mechanism, the adjustment angle is γ=▏a-β▏, so that the straight line formed by the two fixed rods and the two groups of symmetrical bolt holes coincides, and the distance M between the center of the buckle and the center of the blind flange is obtained through the computer, the centers of a plurality of bolt holes are sequentially connected to form a circle, and the radius L of the circle is obtained, the four buckles in the initial state move from the side close to each other to the side away from each other, and then the distance G of the buckle movement is L-M, so that the four buckles and the four blind flange bolt holes are on the same vertical line. Figure 9 It is the intermediate state schematic diagram for positioning the blind flange 29 with four bolt holes 30, and the device can be used for the blind flange bolt hole with the number of 4, 6, 8, 10, 12 or 16 through the four buckles.

[0035] The driving module comprises a corner mechanism and a fixed rod 16, both ends of the fixed rod 16 are provided with sliding grooves 18, the inner sides of the two sliding grooves 18 are both slidably connected with second electric sliding blocks 17 fixedly connected with the upper ends of the hangers 20, the hangers 20 are driven to slide on the fixed rod 16 through the second electric sliding blocks 17, and the automatic movement of the hangers 20 to the upper side of the bolt hole is ensured;

[0036] With reference to Figure 4 The corner mechanism comprises first servo motors 13 fixedly connected with one side of the upper connecting plate 8 and the lower connecting plate 10 respectively, the output ends of the two first servo motors 13 are both fixedly connected with first gears 14, and the sides of the two first gears 14 are respectively engaged with gear rings 15 rotatably sleeved with the connecting columns 12 and fixedly connected with the middle of the fixed rod 16; when the first image scanner 9 and the second image scanner 19 identify the position of the bolt hole, the two fixed rods 16 are driven to rotate a specific angle relative to each other through the two first servo motors 13 and the first gears 14, so that the hangers 20 at the two ends of the two fixed rods 16 are on the same vertical line with the bolt hole, and the subsequent insertion of the sleeve 22 into the inner side of the bolt hole is facilitated, the clamping operation is completed, and the clamping efficiency is improved.

[0037] The driving module is used for adjusting the angle of the four buckles and adjusting the distance of the four buckles, so that the centers of the four buckles are on the same vertical line with the center of the blind flange bolt hole.

[0038] The limiting assembly comprises an upper connecting plate 8 fixedly connected with the lower end of the lifting rack 5, a connecting column 12 and a lower connecting plate 10, and the connecting column 12 is connected in the middle of the upper connecting plate 8 and the lower connecting plate 10.

[0039] With reference to Figure 5 The unloading mechanism comprises an unloading rod 23 slidably connected with the lower side of the sleeve 22, the upper end of the unloading rod 23 is fixedly connected with a return spring 26 fixedly connected with the inner side of the sleeve 22, and the lower side of the unloading rod 23 is fixedly connected with a pull rope 25 fixedly connected with one side of the clamping block 21; when the blind flange is lifted to a certain height, the blind flange needs to be placed on the ground, and then the blind flange is moved to a specified position through the electric turntable 7, the electric push rod 2 and the electric sliding block 3, and the blind flange is lowered; when the unloading rod 23 contacts the ground, the blind flange will first press the clamping block 21 due to a certain weight, and then press the sleeve 22, so that the unloading rod 23 slides into the inner side of the sleeve 22, and then the pull rope 25 at the upper end of the unloading rod 23 pulls the clamping blocks 21 on both sides to slide into the inner side of the sleeve 21, so that the clamping block 21 can be automatically separated from the blind flange, the automatic unloading effect is achieved, the unloading efficiency is improved, manual unloading is not needed, and the safety of personnel is ensured.

[0040] With reference to Figures 1-4, the recognition module comprises a first image scanner 9 fixedly connected with the lower surface of the lower connecting plate 10 and a second image scanner 19 fixedly connected with the lower side of the plurality of second electric sliding blocks 17. One end of the cantilever frame 1 is fixedly connected with an electric push rod 2, and the electric push rod 2 is provided with a first electric sliding block 3 fixedly connected with the upper end of the guide cylinder 6. The other end of the cantilever frame 1 is provided with an electric turntable 7, and the bottom of the electric turntable 7 is fixedly connected with a connecting base 11. The device can be fixed on a support or a trolley through the connecting base 11, thereby improving the practicability of the device. Through the first image scanner 9 and the plurality of second image scanners 19, the position of the blind flange and the blind flange bolt hole can be identified in the maximum range, so that the plurality of clamping blocks 21 are quickly and automatically positioned on the blind flange bolt hole, and the positioning accuracy and efficiency are improved.

[0041] Working principle: first, the center position of the blind flange is determined through the first image scanner 9 and the plurality of second image scanners 19, and the center of the guide cylinder 6 is on the same vertical line as the center of the blind flange. At this time, the point is recorded on the computer, and then the number of blind flange bolt holes is determined and the included angle between adjacent two bolt holes is obtained through the computer. The included angle between adjacent two bolt holes is 360° / the number of bolt holes. Then, the included angle between the two fixed rods in the initial state and the bolt holes is obtained through the computer. The angle between the two fixed rods in the initial state is adjusted through the angle adjusting mechanism, so that the straight line formed by the two fixed rods and the two groups of symmetrical bolt holes coincides, and the distance M between the buckle center and the blind flange center is obtained through the computer. The centers of the plurality of bolt holes are connected in turn to form a circle, and the radius L of the circle is obtained. The four buckles in the initial state move from the side close to each other to the side away from each other, that is, the four buckles move to the positions of the four bolt holes. The distance G of the buckle movement is L-M, so that the four buckles are on the same vertical line as the four blind flange bolt holes. Then, the second gear 28 is driven to rotate by the second servo motor 27, thereby driving the lifting rack 5 to slide on the lower side of the guide cylinder 6, thereby driving the fixed rod 16 and the lifting rod 20 to lift, so that the lower end of the lifting rod 20 drives the sleeve 22 to insert into the inner side of the bolt hole, and the clamping block 21 is extruded by the bolt hole, so that the clamping spring 24 at one end of the clamping block 21 is compressed. When the clamping block 21 moves to the lower surface of the bolt hole, the clamping spring 24 restores the deformation, drives the clamping block 21 to be clamped into the lower side of the bolt hole, and then the sleeve is clamped on the blind flange bolt hole, thereby completing the automatic positioning and hole insertion operation, improving the positioning and hole insertion efficiency, and completing the hoisting of the blind flange;

[0042] The unloading process: through the electric rotating disc 7, the electric push rod 2 and the electric sliding block 3, the blind flange is moved to the specified position, and the blind flange is lowered. The blind flange has a certain weight, which presses the sleeve 22, so that the unloading rod 23 slides into the inside of the sleeve 22, and then the pull rope 25 at the upper end of the unloading rod 23 pulls the clamping blocks 21 on both sides to slide into the inside of the sleeve 21, so that the clamping blocks 21 can be automatically separated from the blind flange, the automatic unloading effect is realized, the unloading efficiency is improved, manual unloading is not required, and the safety of personnel is ensured.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0045] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacement or change according to the technical scheme and inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A lifting device for a blind flange, comprising a lifting device and a locking mechanism located at the bottom of the lifting device, characterized in that, The lifting device includes a cantilever (1) and a guide cylinder (6) that slides under the cantilever (1). The lower end of the guide cylinder (6) is slidably connected to a lifting rack (5). The upper end of the lifting rack (5) is fixedly connected to a compression spring (4) that is fixedly connected to the upper end of the guide cylinder (6). A second servo motor (27) is fixedly connected to one side of the guide cylinder (6). The output end of the second servo motor (27) is fixedly connected to a second gear (28) that meshes with the lifting rack (5). The lower end of the lifting rack (5) is connected to a snap-fit ​​mechanism. The lifting device also includes a corner mechanism that rotates the snap-fit ​​mechanism to correspond to the bolt holes of the blind flange. The snap-fit ​​mechanism includes a snap-fit ​​assembly that snaps onto the bolt holes of the blind flange and an identification system that identifies the positions of the four bolt holes of the blind flange. The identification system includes a reference module, an identification module, and a driving module; The reference module determines the center position of the blind flange through the image scanner at the bottom of the snap-fit ​​mechanism, and places the center of the snap-fit ​​mechanism and the center of the blind flange on the same vertical line. The snap-fit ​​mechanism includes a limiting component fixedly connected to the lower end of the lifting rack (5). The limiting component is rotatably connected with two sets of snap-fit ​​components and a corner mechanism that drives the two sets of snap-fit ​​components to rotate. Both the upper and lower sets of buckle assemblies include a fixed rod (16) rotatably connected to the connecting column (12). Both ends of the fixed rod (16) are slidably connected to a hanger (20). The lower end of the hanger (20) is fixedly connected to a sleeve (22) that is inserted into the lower side of the blind flange bolt hole. Both sides of the sleeve (22) are slidably connected to a block (21) that abuts against the lower side of the blind flange bolt hole. One end of the block (21) is fixedly connected to a snap-fit ​​spring (24) that is fixedly connected to the inside of the sleeve (22). The lower side of the block (21) is an upward inclined slope. The inside of the sleeve (22) is provided with a discharge mechanism that pulls the block (21) into the inside of the sleeve (22). The identification module determines the number of bolt holes in the blind flange using an image scanner and calculates the included angle α between two adjacent bolt holes using a computer. The drive mechanism in the drive module adjusts the position of the buckle so that the center of the buckle is on the straight line formed by the center of the blind flange and the center of the bolt hole, and calculates the distance M between the center of the buckle and the center of the blind flange. The centers of multiple bolt holes are connected sequentially to form a circle, and the radius L of the circle is calculated. Then, the buckle moves a distance G=LM, so that the four buckles and four of the blind flange bolt holes are on the same vertical line. The drive module includes a corner mechanism and a fixed rod (16). The corner mechanism includes a first servo motor (13) fixedly connected to one side of the upper connecting plate (8) and the lower connecting plate (10), respectively. The output ends of the two first servo motors (13) are fixedly connected to a first gear (14). One side of the two first gears (14) is respectively meshed with a gear ring (15) that is rotatably sleeved with the connecting column (12) and fixedly connected to the middle of the fixed rod (16). The two ends of the fixed rod (16) are provided with sliding grooves (18). The inner sides of the two sliding grooves (18) are slidably connected to a second electric slider (17) fixedly connected to the upper end of the lifting rod (20). The drive module is used to adjust the angle of the four buckles and the distance of the four buckles so that the center of the four buckles and the center of the blind flange bolt hole are on the same vertical line.

2. The lifting device for a blind flange as described in claim 1, characterized in that, The limiting component includes an upper connecting plate (8), a connecting column (12), and a lower connecting plate (10) that are fixedly connected to the lower end of the lifting rack (5). The connecting column (12) is connected between the upper connecting plate (8) and the lower connecting plate (10).

3. The lifting device for a blind flange as described in claim 2, characterized in that, The unloading mechanism includes an unloading rod (23) that is slidably connected to the lower side of the sleeve (22). The upper end of the unloading rod (23) is fixedly connected to a return spring (26) that is fixedly connected to the inner side of the sleeve (22). The lower side of the unloading rod (23) is fixedly connected to a pull rope (25) that is fixedly connected to one side of the block (21).

4. The lifting device for a blind flange as described in claim 3, characterized in that, The identification module includes a first image scanner (9) fixedly connected to the lower surface of the lower connecting plate (10) and a second image scanner (19) fixedly connected to the lower side of a plurality of second electric sliders (17).

5. A lifting device for a blind flange as described in any one of claims 2-4, characterized in that, One end of the cantilever (1) is fixedly connected to an electric push rod (2), and the electric push rod (2) is provided with a first electric slider (3) fixedly connected to the upper end of the guide cylinder (6). The other end of the cantilever (1) is provided with an electric turntable (7), and the bottom of the electric turntable (7) is fixedly connected to a connecting base (11).

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