Vacuum cover, vacuum auxiliary hoisting tool and vacuum hoisting method

Abstract

The invention relates to the technical field of vacuum hoisting, in particular to a vacuum cover, a vacuum auxiliary hoisting tool and a vacuum hoisting method. The vacuum cover comprises a sealing cover body; a connecting ring is arranged at the top of the sealing cover; an annular groove is formed in the bottom of the sealing cover body, a vacuumizing through hole is formed in the middle of the annular groove, and a plurality of air guide through holes provided with vacuum guide connecting nozzles are formed in the side face of the sealing cover body. An air guide pipe is arranged in the sealing cover body, one port of the air guide pipe is connected to the vacuumizing through hole, and the other ports of the air guide pipe are connected with the vacuum guide connecting nozzles in a one-to-one correspondence mode. The vacuum auxiliary hoisting tool is formed by connecting a plurality of vacuum covers in series in a matched mode through vacuum hoses, and one vacuum guide connecting nozzle is externally connected with vacuumizing equipment through a vacuum hose. Compared with the prior art, the technical scheme is more flexible to use, and the problem of poor universality in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum lifting, and in particular to a vacuum cover, a vacuum-assisted lifting tool and a vacuum lifting method. Background Art

[0002] With the development of manufacturing industry, lean machining has emerged. Many parts are no longer polished to remove bosses, but rely on automated programs on CNC machine tools to automatically mill off bosses and automatically chamfer and remove burrs. This processing technology greatly saves the workload of later fitter grinding, but the problem that comes with it is that many large parts cannot be hung with hooks and ropes because they have no bosses, making it difficult to lift them out of the machine tool. In many cases, multiple workers collaborate to lift them, and the same problem exists when they are subsequently transferred to the measuring machine for measurement. Manual lifting requires the collaboration of multiple people, which poses a risk of coordination; collaboration among multiple people requires more people and fails to liberate labor.

[0003] In this regard, vacuum lifting equipment is disclosed in the prior art to solve the above technical problems. For example, a Chinese patent document with publication number CN201907911U discloses a vacuum suction cup lifting equipment, which is mainly composed of an electric control box, a vacuum pump and a suction cup. It is characterized in that a warning light is installed on the electric control box, a vacuum filter is installed on the vacuum pump, the electric control box controls the vacuum pump, and the suction cup sucks the flat object through the negative pressure generated by the vacuum pump; in order to complete the rapid transportation of neatly arranged objects, 8 suction cups are installed on the lifting equipment, which are arranged in two rows, 4 in each row. The utility model can efficiently and quickly lift those neatly arranged objects with smooth surfaces, with extremely high efficiency, safety and reliability, and is particularly suitable for forklift warehouse storage and transportation.

[0004] It can be seen that most of the existing technologies adopt a matching structure of a vacuum suction cup and a support frame, which has the following disadvantages: first, the support frame limits the layout structure of the vacuum suction cup, and can only be used to lift parts of a specific structure, and has poor versatility; second, the vacuum suction cup has poor rigidity and can only work with the assistance of the support frame. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention discloses a vacuum cover, a vacuum-assisted lifting tool and a vacuum lifting method, which can be used with vacuum equipment to suck the hoisted parts tightly and then lift them, which can not only solve the problem of missing hooks and ropes for parts, realize crane lifting, but also liberate manpower, protect workers and eliminate human risks. The details are as follows: A vacuum cover, characterized in that it comprises a sealing cover body; A connecting ring for connecting a hook is integrally provided on the top of the sealing cover; The bottom of the sealing cover is provided with an annular groove which is concave inside and convex outside, a vacuum through hole is provided in the middle of the annular groove, a plurality of air guide through holes are provided on the side of the sealing cover, and a vacuum guide connection nozzle is installed in each of the air guide through holes; Two or more air guide pipes are arranged inside the sealing cover, and one of the ports of the air guide pipe is connected to the vacuum through hole, and the other ports are connected to the vacuum connection nozzles one by one.

[0006] Preferably, the sealing cover body is a truncated cone structure.

[0007] Preferably, the connecting ring is in a semicircular arc shape.

[0008] Preferably, a semicircular groove is provided on the top of the sealing cover body.

[0009] Preferably, the bottom of the sealing cover body is located in the middle of the annular groove, and is integrally provided with a vacuum extension groove which is convex inside and concave outside together with the vacuum through hole.

[0010] A vacuum-assisted lifting tool comprises one or more vacuum hoods as described above. When there is only one vacuum hood, the two-way air duct in the vacuum hood has only one vacuum connection nozzle on its sealed hood body, and the vacuum connection nozzle is connected to an external vacuum pumping device through a vacuum hose. When there are two or more vacuum hoods, one of the vacuum hoods has a four-way air duct, and three vacuum connection nozzles are provided on its sealed hood body, one of which is connected to an external vacuum pumping device through a vacuum hose; the other vacuum hoods have three-way air ducts, and two vacuum connection nozzles are provided on their sealed hood bodies; all vacuum hoods are connected end to end through vacuum hoses based on the vacuum connection nozzles to form a closed loop.

[0011] A vacuum hoisting method, using the above vacuum cover, comprises the following steps: S1, determine the required number of vacuum covers according to the structure and weight of the parts to be hoisted; S2, connect all vacuum covers to the vacuum extraction equipment using vacuum hoses; S3, placing the vacuum cover according to the structure of the hoisted parts; S4, start the vacuum equipment to create vacuum conditions for the hoisted parts through the vacuum covers until all the vacuum covers are completely sucked tightly onto the hoisted parts; S5, connecting the hook of the lifting equipment to the connecting ring of the vacuum cover, and starting the lifting equipment to lift the lifting parts to the destination; S6, turn off the vacuum equipment, make sure that the vacuum cover is free from the adsorption state of the hoisted parts, remove all the vacuum covers and return them to their original positions.

[0012] Preferably, the step S1 further includes selecting the required model of the vacuum cover according to the structure and weight of the hoisted part, and different models of vacuum covers have different areas of the vacuum adsorption surface at the bottom.

[0013] Preferably, in step S2: when there is only one vacuum hood, the two-way air duct in the vacuum hood has only one vacuum connection nozzle on its sealed hood body, and the vacuum connection nozzle is connected to the vacuum pumping equipment through a vacuum hose. When there are two or more vacuum hoods, one of the vacuum hoods has a four-way air duct, and three vacuum connection nozzles are set on its sealed hood body; the other vacuum hoods have a three-way air duct, and two vacuum connection nozzles are set on its sealed hood body; all vacuum hoods are connected end to end based on the vacuum connection nozzles by using vacuum hoses to form a closed loop, and the remaining ports of the four-way air duct are connected to the vacuum pumping equipment through vacuum hoses.

[0014] Beneficial technical effects brought by the present invention: The present technical solution proposes a vacuum cover, which is a vacuum-assisted lifting tool based on the assembly of several vacuum covers through vacuum hoses. The vacuum-assisted lifting tool is adsorbed on the lifted parts to assist the lifting equipment in lifting the lifted parts, solving the problem of missing hooks and ropes on the parts. It is of great significance to realize crane lifting, liberate manpower, protect workers and eliminate human risks.

[0015] The vacuum hood and vacuum-assisted lifting tool disclosed in the technical solution use a relatively gentle method of vacuum adsorption to achieve assistance, which is not only easy to use but also avoids mechanical damage to parts.

[0016] The technical solution discloses a vacuum lifting method, which adopts a vacuum-assisted lifting tool which is assembled by a plurality of vacuum covers. The vacuum covers are flexibly connected by vacuum hoses. The number of vacuum covers can be customized according to the volume and weight of parts, and the vacuum covers can be arranged according to the adaptability of the surface structure of parts. Vacuum covers of different models and sizes can also be produced according to needs, and vacuum covers of appropriate sizes can be selected according to the actual size of the surface of the parts. That is, the technical solution is more flexible to use than the prior art, and solves the problem of poor versatility of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the axial structure of a vacuum hood with a preferred structure of the technical solution and a three-way air guide pipe; Figure 2 This is a schematic diagram of a top view of a vacuum hood with a preferred structure of the technical solution and a three-way air duct; Figure 3 This is a schematic diagram of a top view of a vacuum hood with a preferred structure of the technical solution and a four-way air duct; Figure 4 This is a schematic diagram of the top view of a vacuum-assisted lifting tool with an optimal structure of the present technical solution.

[0018] In the figure: 1. Sealing cover; 2. Connecting ring; 3. Annular groove; 4. Vacuum connecting nozzle; 5. Air guide tube; 6. Semicircular groove; 7. Vacuum extension groove; 8. Vacuum hose; 9. Hoisted parts. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] Therefore, the following detailed description of the invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1 This embodiment discloses a vacuum hood, as a preferred embodiment of the present invention, comprising a sealing hood body 1. A connecting ring 2 for connecting a hook is integrally provided on the top of the sealing hood body. An annular groove 3 with a concave inside and a convex outside is provided on the bottom of the sealing hood body 1, a vacuum through hole is provided in the middle of the annular groove 3, a plurality of air guide through holes are provided on the side of the sealing hood body 1, and a vacuum guide connection nozzle 4 is installed in the air guide through hole. Two or more air guide pipes 5 are provided inside the sealing hood body 1, and one of the ports of the air guide pipe 5 is connected to the vacuum through hole, and the other ports are connected to the vacuum guide connection nozzles 4 one by one.

[0022] Based on the above-mentioned vacuum hood structure, when two-way air ducts 5 are arranged inside the sealed hood body 1, the vacuum hood structure is suitable for single use, and only the only vacuum guide connection nozzle 4 can be used in conjunction with the vacuum hose 8 to connect to the external vacuum pumping equipment. When multiple air ducts 5 are arranged inside the sealed hood body 1, taking the three-way air duct 5 as an example, the corresponding sealed hood body 1 is provided with two vacuum guide connection nozzles 4. When the vacuum hood is used alone, one of the vacuum guide connection nozzles 4 is blocked, and the other vacuum guide connection nozzle 4 can be connected to the external vacuum pumping equipment in conjunction with the vacuum hose 8; when multiple vacuum hoods are used in conjunction, all vacuum hoods are connected in series in sequence through the vacuum hose 8, the remaining vacuum guide connection nozzle 4 of the first vacuum hood is connected to the external vacuum pumping equipment in conjunction with the vacuum hose 8, and the remaining vacuum guide connection nozzle 4 of the last vacuum hood is blocked. In addition, for the vacuum hood with multiple air ducts 5, the vacuum hood with three-way air ducts 5 and the vacuum hood with four-way air ducts 5 can be mixed and used, that is, several vacuum hoods with three-way air ducts 5 are connected in series in sequence. In the vacuum hood series structure, there are still two suspended vacuum connecting nozzles 4 left. The two suspended vacuum connecting nozzles 4 are respectively connected to the two vacuum connecting nozzles 4 of the vacuum hood with four-way air ducts 5, and the remaining vacuum connecting nozzle 4 of the vacuum hood with four-way air ducts 5 can be connected to an external vacuum pumping device through the vacuum hose 8.

[0023] According to the above logic, when the vacuum hood with multiple air ducts 5 is used in combination or mixed, it can be mixed and connected according to needs and convenience, and finally the vacuum connection nozzle 4 required for the external vacuum pumping equipment is left. In addition, if there is a suspended vacuum connection nozzle 4, it can be sealed.

[0024] In the above-mentioned vacuum hood structure, the connecting ring 2 is used to connect the hook, that is, the technical solution can be used in conjunction with the lifting equipment, which is convenient and quick to use. The so-called concave inside and convex outside annular groove 3 means that when looking down in the inner cavity of the vacuum hood, the annular groove 3 is concave, and when looking up from the bottom of the vacuum hood, the annular groove 3 is convex. In this way, at the bottom of the vacuum hood structure, a space for vacuuming is created based on the annular groove 3. The annular groove 3 plays the role of laying a sealing strip. It only needs to extract the air in the middle of the annular groove 3 to form a negative pressure at the bottom of the vacuum hood, so as to achieve the adsorption of the hoisted parts 9. Therefore, a vacuum through hole is set in the middle of the annular groove 3 for installing the air duct 5, and the air in the middle space of the annular groove 3 is guided out by the air duct 5.

[0025] Example 2 This embodiment discloses a vacuum hood as a preferred embodiment of the present invention, that is, based on Example 1, its sealing hood body 1 is a truncated cone structure. Based on this structure, a variety of vacuum hoods of different models and sizes can be set, and vacuum hoods of different models and sizes have different bottom areas. That is, the bottom circle of the vacuum hood can be made into the required size according to specific usage requirements. The larger the part on the upper surface of the hoisted part 9 that can be adsorbed, the larger the bottom circle of the vacuum hood can be made. Furthermore, the main reason why the main structure (sealing hood body 1) chooses a truncated cone structure is that while increasing the adsorption area of ​​the lower half, it can also reduce the use of overall materials.

[0026] Example 3 This embodiment discloses a vacuum hood, as a preferred embodiment of the present invention, that is, based on embodiment 1 or 2, the connecting ring 2 is in a semicircular arc shape. The connecting ring 2 of this structure has a larger contact connection area with the sealing hood body 1, which is conducive to integrally forming with the sealing hood body 1 while ensuring structural stability, and reduces the overall height of the vacuum hood to a certain extent.

[0027] Based on the above structure, further, a semicircular groove 6 is provided on the top of the sealing cover body 1, which reserves a movable space for the hook, and can facilitate the hook to be connected to the connecting ring 2, avoiding the problem that some oversized hooks cannot be hung.

[0028] Example 4 This embodiment discloses a vacuum cover as a preferred embodiment of the present invention, that is, based on embodiment 1, 2 or 3, the bottom of the sealing cover body 1 is located in the middle of the annular groove 3, and is integrally provided with a vacuum extension groove 7 with a convex inside and a concave outside, together with the vacuum through hole. The purpose is to increase the vacuum extraction area, increase the firmness of the adsorption of the hoisted parts 9, and improve the circulation of the internal air, so as to facilitate rapid and stable vacuum extraction.

[0029] Example 5 This embodiment discloses a vacuum-assisted lifting tool. As a preferred embodiment of the present invention, for a small-volume and light-weight lifting part 9, a vacuum cover is selected to assemble into a vacuum-assisted lifting tool, wherein the vacuum cover is a vacuum cover as described in Embodiment 1, 2, 3 or 4, specifically including the following solutions: 1) When two-way air ducts 5 are provided in the vacuum cover, the only vacuum connection nozzle 4 cooperates with the vacuum hose 8 to connect to the external vacuum pumping equipment.

[0030] 2) When a three-way air duct 5 is provided in the vacuum cover, one of the vacuum connection nozzles 4 cooperates with the vacuum hose 8 to be connected to an external vacuum pumping device, and the other vacuum connection nozzle 4 is blocked.

[0031] 3) When a four-way air duct 5 is provided in the vacuum cover, one of the vacuum connection nozzles 4 cooperates with the vacuum hose 8 to be connected to an external vacuum pumping device, and the other two vacuum connection nozzles 4 are blocked separately or connected together with a vacuum hose 8.

[0032] In summary, according to the above logic, when five or more air ducts 5 are provided in the vacuum cover, one of the vacuum connection nozzles 4 cooperates with the vacuum hose 8 to connect to the external vacuum pumping equipment, and the remaining vacuum connection nozzles 4 are blocked separately, or sealed and connected with the vacuum hose 8.

[0033] Example 6 This embodiment discloses a vacuum-assisted lifting tool. As a preferred embodiment of the present invention, two vacuum covers are selected to assemble into a vacuum-assisted lifting tool according to the volume and size of the lifted part 9, wherein the vacuum cover is a vacuum cover as described in Embodiment 1, 2, 3 or 4, and specifically includes the following schemes: 1) Select a vacuum hood with two-way air ducts 5 and a vacuum hood with three-way air ducts 5, the only vacuum connection nozzle 4 of the former is connected to one of the vacuum connection nozzles 4 of the latter through a vacuum hose 8, and the remaining vacuum connection nozzle 4 of the latter is connected to an external vacuum pumping device through the vacuum hose 8.

[0034] 2) Select a vacuum hood with a three-way air duct 5 and a vacuum hood with a four-way air duct 5, the two vacuum connecting nozzles 4 of the former are connected to two of the vacuum connecting nozzles 4 of the latter through vacuum hoses 8 respectively, and the remaining vacuum connecting nozzle 4 of the latter is connected to an external vacuum pumping device through the vacuum hose 8.

[0035] 3) Select two vacuum covers with three-way air ducts 5 inside, seal one of the vacuum connection nozzles 4 of the first vacuum cover, and connect the remaining vacuum connection nozzle 4 to one of the vacuum connection nozzles 4 of the second vacuum cover via a vacuum hose 8. The remaining vacuum connection nozzle 4 of the second vacuum cover is connected to an external vacuum pumping device via the vacuum hose 8.

[0036] 4) Select a vacuum cover with two-way air ducts 5 and a vacuum cover with four-way air ducts 5, the only vacuum connection nozzle 4 of the former is connected to one of the vacuum connection nozzles 4 of the latter through a vacuum hose 8, and one of the remaining two vacuum connection nozzles 4 of the latter is blocked and sealed, and the other is connected to an external vacuum pumping device through the vacuum hose 8. It is characterized in that it includes one or more vacuum covers as described in any one of claims 1 to 5.

[0037] 5) Select two vacuum covers with four-way air ducts 5, two of the vacuum connection nozzles 4 of the first vacuum cover are connected to two of the vacuum connection nozzles 4 of the second vacuum cover through vacuum hoses 8, the remaining vacuum connection nozzle 4 of the first vacuum cover is blocked, and the remaining vacuum connection nozzle 4 of the second vacuum cover is connected to an external vacuum pumping device through the vacuum hose 8.

[0038] To summarize, according to the above logic, when one of the selected vacuum covers has a built-in multi-way air duct 5, on the premise that the two vacuum covers are connected via the vacuum hose 8, any one of the remaining vacuum connecting nozzles 4 is selected to be connected to an external vacuum pumping device via the vacuum hose 8, and all the remaining vacuum connecting nozzles 4 can be sealed separately, or sealed and connected using the vacuum hose 8.

[0039] Example 7 This embodiment discloses a vacuum-assisted lifting tool. As a preferred embodiment of the present invention, according to the volume and size of the hoisted part 9, three or more vacuum covers are selected to assemble into a vacuum-assisted lifting tool, wherein the vacuum cover is a vacuum cover as described in Embodiment 1, 2, 3 or 4, specifically including the following schemes: 1) Select a vacuum cover with two-way air ducts 5, and select the other vacuum covers with three-way air ducts 5. All vacuum covers with three-way air ducts 5 are connected in series through vacuum hoses 8. In the series-connected vacuum cover structure, the remaining vacuum connection nozzle 4 of the rear vacuum cover is connected to the vacuum cover with two-way air ducts 5 through the vacuum hose 8, and the remaining vacuum connection nozzle 4 of the head vacuum cover is connected to the vacuum pumping device through the vacuum hose 8.

[0040] 2) Select a vacuum cover with a four-way air duct 5, and select the other vacuum covers with a three-way air duct 5. All vacuum covers with three-way air ducts 5 are connected in series through vacuum hoses 8. In the series-connected vacuum cover structure, the remaining vacuum connection nozzle 4 of the rear vacuum cover and the remaining vacuum connection nozzle 4 of the head vacuum cover are respectively connected to two vacuum connection nozzles 4 of the vacuum cover with a four-way air duct 5 through vacuum hoses 8 to form a closed loop. The remaining vacuum connection nozzle 4 of the vacuum cover with a four-way air duct 5 is connected to an external vacuum pumping device through the vacuum hose 8.

[0041] 3) Select a vacuum cover with a four-way air duct 5, and select the other vacuum covers with three-way air duct 5. All vacuum covers with three-way air duct 5 are connected in series through vacuum hose 8. In the series-connected vacuum cover structure, the remaining vacuum connection nozzle 4 of the rear vacuum cover is blocked, and the remaining vacuum connection nozzle 4 of the head vacuum cover is connected to one of the vacuum connection nozzles 4 of the vacuum cover with four-way air duct 5 through vacuum hose 8. Of the remaining two vacuum connection nozzles 4 of the vacuum cover with four-way air duct 5, one is blocked, and the other is connected to an external vacuum pumping device through vacuum hose 8.

[0042] To summarize, according to the above logic, when all the selected vacuum covers are vacuum covers with built-in multi-way air ducts 5, on the premise that all the vacuum covers are connected in series through the vacuum hose 8 in a straight line, a single-loop closed-loop series and / or a multi-loop closed-loop series, any one of the remaining vacuum connecting nozzles 4 is selected to be connected to an external vacuum pumping device through the vacuum hose 8, and all the other vacuum connecting nozzles 4 can be sealed separately, or sealed and connected using the vacuum hose 8.

[0043] Example 8 This embodiment discloses a vacuum lifting method, which, as a preferred embodiment of the present invention, adopts a vacuum cover as described in Embodiment 1, 2, 3 or 4, and includes the following steps: S1, determining the required number of vacuum covers according to the structure and weight of the hoisted part 9, and the larger the volume and the heavier the weight of the hoisted part 9, the more vacuum covers are required.

[0044] Taking into account the different densities of different hoisted parts 9, there are parts with small volume and large weight, as well as parts with large volume and small weight. Furthermore, the required vacuum cover model is selected according to the structure and weight of the hoisted parts 9. Different models of vacuum covers have different areas of the vacuum adsorption surface at the bottom.

[0045] Based on this, for small-volume and large-weight parts, a smaller number of vacuum covers with large bottom vacuum adsorption surfaces can be selected; for large-volume and small-weight parts, a smaller number of vacuum covers with large bottom vacuum adsorption surfaces can be selected, or a larger number of vacuum covers with small bottom vacuum adsorption surfaces can be selected. For parts with multiple surface planes of different sizes, multiple vacuum covers with different bottom vacuum adsorption surface areas can be selected for different surface planes. In summary, the present technical solution can arbitrarily select and use a combination of vacuum covers according to actual needs.

[0046] S2, using vacuum hose 8 to connect all vacuum covers to vacuum equipment, the specific connection method refers to Examples 5, 6 and 7.

[0047] S3, placing the vacuum cover according to the structure of the hoisted part 9.

[0048] S4, start the vacuum equipment to create a vacuum condition for the hoisted part 9 through the vacuum cover until all the vacuum covers are completely sucked and tightened to the hoisted part 9.

[0049] S5, connecting the hook of the lifting equipment to the connecting ring 2 of the vacuum cover, and starting the lifting equipment to lift the lifted part 9 to the destination.

[0050] S6, turn off the vacuum equipment, make sure that the vacuum cover is out of the adsorption state of the hoisted part 9, remove all the vacuum covers and return them to their original positions.

Claims

1. A vacuum hood, characterized in that: It comprises a sealing cover (1); A connecting ring (2) for connecting a hook is integrally provided on the top of the sealing cover; The bottom of the sealing cover body (1) is provided with an annular groove (3) which is concave inside and convex outside, a vacuum through hole is provided in the middle of the annular groove (3), a plurality of air guide through holes are provided on the side of the sealing cover body (1), and vacuum guide connection nozzles (4) are installed in the air guide through holes; Two or more air guide tubes (5) are arranged inside the sealing cover (1), and one of the ports of the air guide tube (5) is connected to the vacuum through hole, while the remaining ports are connected to the vacuum connection nozzles (4) in a one-to-one correspondence.

2. A vacuum cover as claimed in claim 1, characterized in that: The sealing cover body (1) is in a truncated cone structure.

3. A vacuum cover according to claim 1, characterized in that: The connecting ring (2) is in a semicircular arc shape.

4. A vacuum cover as claimed in claim 3, characterized in that: A semicircular groove (6) is provided on the top of the sealing cover body (1).

5. A vacuum cover according to claim 1, characterized in that: The bottom of the sealing cover body (1) is located in the middle of the annular groove (3), and is integrally provided with a vacuum extension groove (7) which is convex inside and concave outside, together with the vacuum through hole.

6. A vacuum-assisted lifting tool, characterized in that: Comprising one or more vacuum covers as described in any one of claims 1 to 5; When there is only one vacuum cover, the two-way air guide pipe (5) in the vacuum cover has only one vacuum guide connection nozzle (4) disposed on the sealed cover body (1), and the vacuum guide connection nozzle (4) is connected to an external vacuum pumping device via a vacuum hose (8); When there are two or more vacuum covers, one of the vacuum covers is provided with a four-way air guide pipe (5), and its sealed cover body (1) is provided with three vacuum guide connection nozzles (4), one of which is connected to an external vacuum pumping device via a vacuum hose (8); the other vacuum covers are provided with a three-way air guide pipe (5), and its sealed cover body (1) is provided with two vacuum guide connection nozzles (4); all the vacuum covers are connected end to end based on the vacuum guide connection nozzles (4) via the vacuum hose (8) to form a closed loop.

7. A vacuum lifting method, characterized in that: A vacuum cover as claimed in any one of claims 1 to 5 is used, The following steps are involved: S1, determining the required number of vacuum covers according to the structure and weight of the hoisted part (9); S2, connecting all vacuum covers to the vacuum extraction equipment using a vacuum hose (8); S3, placing the vacuum cover according to the structure of the hoisted part (9); S4, starting the vacuuming equipment to create a vacuum condition for the hoisted part (9) through the vacuum cover until all the vacuum covers are completely sucked and tightened to the hoisted part (9); S5, connecting the hook of the lifting device to the connecting ring (2) of the vacuum cover, and starting the lifting device to lift the lifting part (9) to the destination; S6, turn off the vacuum equipment, make sure that the vacuum cover is no longer adsorbed on the hoisted part (9), remove all the vacuum covers and return them to their original positions.

8. A vacuum lifting method as claimed in claim 7, characterized in that: The step S1 also includes selecting the required model of the vacuum cover according to the structure and weight of the hoisted part (9), and different models of vacuum covers have different areas of the vacuum adsorption surface at the bottom.

9. A vacuum lifting method as claimed in claim 7, characterized in that: In step S2: When there is only one vacuum cover, the two-way air guide pipe (5) in the vacuum cover has only one vacuum guide connection nozzle (4) disposed on the sealed cover body (1), and the vacuum guide connection nozzle (4) is connected to an external vacuum pumping device via a vacuum hose (8); When there are two or more vacuum covers, one of the vacuum covers is provided with a four-way air guide pipe (5), and its sealed cover body (1) is provided with three vacuum guide connection nozzles (4); the other vacuum covers are provided with a three-way air guide pipe (5), and its sealed cover body (1) is provided with two vacuum guide connection nozzles (4); all the vacuum covers are connected end to end based on the vacuum guide connection nozzles (4) in sequence by using a vacuum hose (8) to form a closed loop, and the remaining ports of the four-way air guide pipe (5) are connected to a vacuum extraction device through the vacuum hose (8).

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