A vacuum hood, a vacuum assisted lifting tool and a vacuum lifting method

Abstract

The present application relates to the technical field of vacuum hoisting, and particularly relates to a vacuum cover, a vacuum-assisted hoisting tool and a vacuum hoisting method. The vacuum cover comprises a sealed cover body; a connecting ring is arranged at the top of the sealed cover; an annular groove is arranged at the bottom of the sealed cover body, a vacuum extraction through hole is arranged in the middle of the annular groove, and a plurality of air guide through holes provided with air guide vacuum connection nozzles are arranged on the side surface of the sealed cover body; an air guide pipe is arranged in the sealed cover body, one port of the air guide pipe is connected to the vacuum extraction through hole, and the remaining ports are connected to the air guide vacuum connection nozzles one by one. The vacuum-assisted hoisting tool is formed by connecting a plurality of vacuum covers through vacuum hoses, and one air guide vacuum connection nozzle is connected to a vacuum extraction device through a vacuum hose. Compared with the prior art, the technical scheme is more flexible to use, and solves the problem of poor universality of the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum lifting, in particular to a vacuum cover, a vacuum-assisted lifting tool and a vacuum lifting method. BACKGROUND

[0002] With the development of manufacturing industry, lean processing emerges as the times require, and many parts are no longer polished to remove bosses in the traditional way, but rely on automatic programs on numerical control machine tools to automatically mill bosses and automatically chamfer burrs. This processing technology greatly saves the workload of subsequent bench work polishing, but the problem that follows is that many large parts cannot be hung on hooks and ropes because they have no bosses, making it difficult to lift them out of the machine tool. Many times, multiple workers cooperate to lift, and the same problem exists when they are subsequently transported to the measuring machine. Artificial lifting requires multiple people to work together, which has the risk of whether they can coordinate, and multiple people working together requires more personnel, which fails to free up labor.

[0003] To this end, the prior art discloses a vacuum lifting device to solve the above technical problems. For example, Chinese patent document No. CN201907911U discloses a vacuum suction cup type lifting device, which mainly consists of an electric control box, a vacuum pump and a suction cup. Its features are that the electric control box is provided with a warning light, the vacuum pump is provided with a vacuum filter, the electric control box controls the vacuum pump, and the suction cup is attracted to a flat object by the negative pressure generated by the vacuum pump. In order to complete the fast transport of neatly arranged objects, eight suction cups are installed on the lifting device, arranged in two rows, four in each row. This prior art can efficiently and quickly lift neatly arranged smooth-surfaced objects, is extremely efficient and safe and reliable, and is particularly suitable for forklift warehouse storage and transportation work.

[0004] As can be seen, most of the prior art adopts a structure in which a vacuum suction cup cooperates with a support frame, which has the following shortcomings: first, the support frame limits the layout structure of the vacuum suction cup, and can only be used to lift parts with specific structures, which is not very versatile; second, the rigidity of the vacuum suction cup is not good, and it can only work with the assistance of the support frame. SUMMARY

[0005] The present application discloses a vacuum cover, a vacuum-assisted lifting tool and a vacuum lifting method to solve the problems existing in the prior art. The parts to be lifted are attracted tightly by cooperating with a vacuumizing device, which can solve the problem of not being able to hang on hooks and ropes, realize crane lifting, free up manpower, protect workers and eliminate human risks. The specific implementation is as follows:

[0006] A vacuum cover, characterized in that it comprises a sealed cover body.

[0007] The top of the sealed cover body is integrally provided with a connecting ring for connecting a hook.

[0008] The bottom of the sealing cover is provided with an annular groove with an inner concave and outer convex structure, and a vacuum extraction through hole is arranged in the middle of the annular groove. A plurality of air guide through holes are arranged on the side surface of the sealing cover, and a vacuum guide connecting nozzle is arranged in the air guide through hole.

[0009] The inside of the sealing cover is provided with a two-way or multi-way air guide pipe, and one end of the air guide pipe is connected to the vacuum extraction through hole, and the remaining ends are connected to the vacuum guide connecting nozzles one by one.

[0010] Preferably, the sealing cover is in a circular truncated cone structure.

[0011] Preferably, the connecting ring is in a semicircular arc shape.

[0012] Preferably, the top of the sealing cover is provided with a semicircular groove.

[0013] Preferably, the bottom of the sealing cover is provided with a vacuum extraction extension groove with an inner convex and outer concave structure at the middle of the annular groove.

[0014] A vacuum auxiliary lifting tool includes one or more of the above-mentioned vacuum covers. When there is only one vacuum cover, the two-way air guide pipe in the vacuum cover is provided with only one vacuum guide connecting nozzle on the sealing cover, and the vacuum guide connecting nozzle is connected to the vacuum extraction equipment through a vacuum hose. When there are two or more vacuum covers, one of the vacuum covers is provided with a four-way air guide pipe, and the sealing cover of the vacuum cover is provided with three vacuum guide connecting nozzles, one of which is connected to the vacuum extraction equipment through a vacuum hose; the remaining vacuum covers are provided with a three-way air guide pipe, and the sealing cover of the vacuum cover is provided with two vacuum guide connecting nozzles; all the vacuum covers are connected in series through the vacuum hoses based on the vacuum guide connecting nozzles to form a closed loop.

[0015] A vacuum lifting method using the above-mentioned vacuum cover includes the following steps:

[0016] S1, determining the number of required vacuum covers according to the structure and weight of the lifted part;

[0017] S2, connecting all the vacuum covers to the vacuum extraction equipment through a vacuum hose;

[0018] S3, arranging the vacuum covers according to the structure of the lifted part;

[0019] S4, starting the vacuum extraction equipment to create a vacuum condition for the lifted part through the vacuum cover until all the vacuum covers are tightly attached to the lifted part;

[0020] S5, connecting the hook of the lifting equipment to the connecting ring of the vacuum cover, and starting the lifting equipment to lift the lifted part to the destination;

[0021] S6, the vacuum device is closed, and after determining that the vacuum cover is separated from the suction state of the hoisted part, all the vacuum covers are removed and returned to the original position.

[0022] Preferably, in the step S1, the model of the required vacuum cover is selected according to the structure and weight of the hoisted part.

[0023] Preferably, in the step S2, when there is only one vacuum cover, a two-way air guide pipe in the vacuum cover is provided with only one vacuum guide connecting mouth on the sealing cover body, and the vacuum guide connecting mouth is connected to the vacuum device through a vacuum hose.

[0024] The beneficial technical effects brought by the present application are as follows:

[0025] The present application provides a vacuum cover, and a vacuum auxiliary hoisting tool is assembled by a plurality of vacuum covers through a vacuum hose.

[0026] The vacuum cover and the vacuum auxiliary hoisting tool disclosed by the present application realize assistance by using vacuum suction, which is a relatively soft mode.

[0027] The vacuum hoisting method disclosed by the present application uses a vacuum auxiliary hoisting tool assembled by a plurality of vacuum covers. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Fig. 4 is a schematic view of a preferred structure of a vacuum cover with a three-way air guide pipe according to the present application;

[0029] Figure 2A preferred structure of the vacuum cover according to the present application and a top view structural schematic diagram of the vacuum cover with a three-way air guide pipe;

[0030] Figure 3 A preferred structure of the vacuum cover according to the present application and a top view structural schematic diagram of the vacuum cover with a four-way air guide pipe;

[0031] Figure 4 A top view structural schematic diagram of the vacuum-assisted lifting tool according to the present application.

[0032] In the figure:

[0033] 1, sealing cover body; 2, connecting ring; 3, annular groove; 4, vacuum guide connector; 5, air guide pipe; 6, semicircular groove; 7, vacuum extension groove; 8, vacuum hose; 9, part to be lifted. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments.

[0035] Therefore, the following detailed description of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0036] Embodiment 1

[0037] The present embodiment discloses a vacuum cover, which is a preferred embodiment of the present application and comprises a sealing cover body 1. The sealing cover body 1 is integrally provided at the top with a connecting ring 2 for connecting a hook. The bottom of the sealing cover body 1 is provided with an annular groove 3 which is concave inside and convex outside. A vacuum hole is formed in the middle of the annular groove 3. A plurality of air guide holes are formed in the side of the sealing cover body 1, and a vacuum guide connector 4 is installed in the air guide holes. The inside of the sealing cover body 1 is provided with a two-way or multi-way air guide pipe 5. One end of the air guide pipe 5 is connected to the vacuum hole, and the other ends are connected to the vacuum guide connectors 4 one by one.

[0038] Based on the above-mentioned vacuum hood structure, when the sealed hood 1 is equipped with two-way air guide pipes 5, the vacuum hood structure is suitable for single use. It only needs to be connected to a vacuum pumping device through its single vacuum guide nozzle 4 and vacuum hose 8. When the sealed hood 1 is equipped with multiple-way air guide pipes 5, taking a three-way air guide pipe 5 as an example, the corresponding sealed hood 1 is equipped with two vacuum guide nozzles 4. When the vacuum hood is used alone, one of the vacuum guide nozzles 4 is sealed, and the other vacuum guide nozzle 4 is connected to a vacuum pumping device through the vacuum hose 8. When multiple vacuum hoods are used together, all vacuum hoods are connected in series through the vacuum hose 8. The remaining vacuum guide nozzles 4 of the first vacuum hood are connected to a vacuum pumping device through the vacuum hose 8, and the remaining vacuum guide nozzles 4 of the last vacuum hood are sealed. In addition, for vacuum hoods with multi-port air ducts 5, vacuum hoods with three-port air ducts 5 and vacuum hoods with four-port air ducts 5 can be used in combination. That is, several vacuum hoods with three-port air ducts 5 are connected in series. In this series structure of vacuum hoods, there are still two suspended vacuum connection nozzles 4. These two suspended vacuum connection nozzles 4 are respectively connected to the two vacuum connection nozzles 4 of the vacuum hood with four-port air ducts 5. The remaining vacuum connection nozzle 4 of the vacuum hood with four-port air ducts 5 is connected to the vacuum hose 8 to external vacuum equipment.

[0039] Based on the above logic, when a vacuum hood with a multi-channel air duct 5 is used in combination or mixed, it can be connected in a more convenient and necessary manner. Finally, the vacuum connection nozzle 4 of the external vacuum pumping equipment that needs to be connected can be left open. Otherwise, if there is any suspended vacuum connection nozzle 4, it can be blocked.

[0040] In the aforementioned vacuum chamber structure, the connecting ring 2 is used to connect the hook, meaning this technical solution can be used in conjunction with lifting equipment, making it convenient and quick to use. The so-called concave-convex annular groove 3 means that when viewed from below within the vacuum chamber, the annular groove 3 is concave, and when viewed from above, it is convex. Thus, at the bottom of the vacuum chamber structure, a space for vacuuming is created based on the annular groove 3. The annular groove 3 acts as a sealing strip; simply extracting the air from the center of the annular groove 3 creates a negative pressure at the bottom of the vacuum chamber, achieving the adsorption of the lifted part 9. Therefore, a vacuuming through-hole is provided in the center of the annular groove 3 for installing the air guide pipe 5, which is used to remove the air from the space in the center of the annular groove 3.

[0041] Example 2

[0042] This embodiment discloses a vacuum cover, which, as a preferred implementation of the present invention, is based on Embodiment 1, wherein the sealing cover 1 has a frustum structure. Based on this structure, various vacuum covers of different sizes and models can be provided, each with a different bottom area. That is, the bottom circle of the vacuum cover can be made to the required size according to specific usage requirements; the larger the area on the upper surface of the suspended part 9 that can be adsorbed, the larger the bottom circle of the vacuum cover can be. Furthermore, the main reason for choosing a frustum structure for the main structure (sealing cover 1) is to increase the adsorption area of ​​the lower half while reducing the overall material usage.

[0043] Example 3

[0044] This embodiment discloses a vacuum shroud. As a preferred embodiment of the present invention, based on embodiment 1 or 2, the connecting ring 2 is semi-circular. This structure provides a larger contact area between the connecting ring 2 and the sealing shroud 1, which facilitates integral molding with the sealing shroud 1 while ensuring structural stability, and also reduces the overall height of the vacuum shroud to a certain extent.

[0045] Based on the above structure, a semi-circular groove 6 is further provided on the top of the sealing cover 1, which provides space for the hook to move, making it easy for the hook to connect to the connecting ring 2, thus avoiding the problem that some oversized hooks cannot be hung.

[0046] Example 4

[0047] This embodiment discloses a vacuum cover, as a preferred implementation of the present invention, based on embodiments 1, 2, or 3. The bottom of the sealing cover 1, located in the middle of the annular groove 3, is integrally provided with a vacuum extension groove 7 that is convex in the center and concave in the outside, along with the vacuum through-hole. Its purpose is to increase the vacuum extraction area, enhance the firmness of the suspended parts 9, and improve internal air circulation, facilitating rapid and stable vacuuming.

[0048] Example 5

[0049] This embodiment discloses a vacuum-assisted lifting tool. As a preferred embodiment of the present invention, for small-volume and light-weight lifting parts 9, a vacuum cover is selected and assembled into a vacuum-assisted lifting tool. The vacuum cover is a vacuum cover as described in embodiments 1, 2, 3 or 4, specifically including the following schemes:

[0050] 1) When the vacuum chamber is equipped with two air guide pipes 5, its only vacuum guide connector 4 is connected to the vacuum hose 8 to external vacuum equipment.

[0051] 2) When a three-way air guide pipe 5 is installed inside the vacuum chamber, one of the vacuum guide nozzles 4 is connected to the vacuum hose 8 to external vacuum equipment, and the other vacuum guide nozzle 4 is blocked.

[0052] 3) When the vacuum chamber is equipped with a four-way air guide pipe 5, one of the vacuum guide nozzles 4 is connected to the vacuum hose 8 to the external vacuum pumping equipment, and the other two vacuum guide nozzles 4 are blocked, or a vacuum hose 8 is used to connect them together.

[0053] In summary, based on the above logic, when a vacuum chamber is equipped with five or more air-conducting pipes 5, one of the vacuum-conducting connectors 4 is connected to a vacuum hose 8 for external vacuuming equipment, while the other vacuum-conducting connectors 4 are blocked or sealed using the vacuum hose 8.

[0054] Example 6

[0055] This embodiment discloses a vacuum-assisted lifting tool. As a preferred embodiment of the present invention, two vacuum chambers are selected and assembled into a vacuum-assisted lifting tool according to the volume and size of the part 9 to be lifted. The vacuum chamber is a vacuum chamber as described in Embodiments 1, 2, 3 or 4, specifically including the following scheme:

[0056] 1) Select a vacuum hood with two-way air guide pipes 5 and a vacuum hood with three-way air guide pipes 5. The only vacuum guide nozzle 4 of the former is connected to one of the vacuum guide nozzles 4 of the latter through a vacuum hose 8. The remaining vacuum guide nozzle 4 of the latter is connected to an external vacuum pumping device through a vacuum hose 8.

[0057] 2) Select a vacuum hood with a three-way air guide tube 5 and a vacuum hood with a four-way air guide tube 5. The two vacuum guide nozzles 4 of the former are connected to two of the vacuum guide nozzles 4 of the latter through vacuum hoses 8 respectively. The remaining vacuum guide nozzle 4 of the latter is connected to a vacuum pumping device through a vacuum hose 8.

[0058] 3) Select two vacuum hoods with internal three-way air guide pipes 5. Seal one of the vacuum guide nozzles 4 of the first vacuum hood, and connect the remaining vacuum guide nozzle 4 to one of the vacuum guide nozzles 4 of the second vacuum hood through a vacuum hose 8. Connect the remaining vacuum guide nozzle 4 of the second vacuum hood to an external vacuum pumping device through the vacuum hose 8.

[0059] 4) Select a vacuum hood with two-way air guide pipes 5 and a vacuum hood with four-way air guide pipes 5. The only vacuum guide nozzle 4 of the former is connected to one of the vacuum guide nozzles 4 of the latter through a vacuum hose 8. Of the remaining two vacuum guide nozzles 4 of the latter, one is blocked and the other is connected to a vacuum pumping device through the vacuum hose 8.

[0060] 5) Select two vacuum hoods with four-way air guide pipes 5 inside. Two of the vacuum guide nozzles 4 of the first vacuum hood and two of the vacuum guide nozzles 4 of the second vacuum hood are connected to each other through vacuum hoses 8. The remaining vacuum guide nozzle 4 of the first vacuum hood is blocked. The remaining vacuum guide nozzle 4 of the second vacuum hood is connected to a vacuum pumping device through vacuum hoses 8.

[0061] In summary, based on the above logic, when the selected vacuum hood has a multi-channel air duct 5 inside, under the premise that the two vacuum hoods are connected by a vacuum hose 8, any one of the remaining vacuum connection nozzles 4 can be connected to a vacuum pumping device through the vacuum hose 8, and all other vacuum connection nozzles 4 can be blocked or sealed by using the vacuum hose 8.

[0062] Example 7

[0063] This embodiment discloses a vacuum-assisted lifting tool. As a preferred embodiment of the present invention, three or more vacuum chambers are selected and assembled into a vacuum-assisted lifting tool according to the volume and size of the part 9 to be lifted. The vacuum chamber is a vacuum chamber as described in Embodiments 1, 2, 3 or 4, specifically including the following scheme:

[0064] 1) Select one vacuum hood with two-way air guide pipes 5 inside, and select the rest with three-way air guide pipes 5 inside. Connect all the vacuum hoods with three-way air guide pipes 5 in series through vacuum hoses 8. In the series vacuum hood structure, the remaining vacuum connector 4 of the tail vacuum hood is connected to the vacuum hood with two-way air guide pipes 5 inside through vacuum hoses 8, and the remaining vacuum connector 4 of the head vacuum hood is connected to a vacuum pumping device outside through vacuum hoses 8.

[0065] 2) Select one vacuum hood with an internal four-way air guide tube 5, and select the rest with internal three-way air guide tubes 5. Connect all the vacuum hoods with internal three-way air guide tubes 5 in series using vacuum hoses 8. In the series vacuum hood structure, the remaining vacuum connector 4 of the tail vacuum hood and the remaining vacuum connector 4 of the head vacuum hood are connected to two of the vacuum connector 4 of the vacuum hood with internal four-way air guide tubes 5 through vacuum hoses 8, forming a closed loop. The remaining vacuum connector 4 of the vacuum hood with internal four-way air guide tubes 5 is connected to an external vacuum pumping device through vacuum hoses 8.

[0066] 3) Select one vacuum hood with an internal four-way air duct 5, and select the rest with internal three-way air duct 5. Connect all the vacuum hoods with internal three-way air duct 5 in series using vacuum hoses 8. In the series vacuum hood structure, seal the remaining vacuum connection port 4 of the tail vacuum hood, and connect the remaining vacuum connection port 4 of the head vacuum hood to one of the vacuum connection ports 4 of the vacuum hood with the internal four-way air duct 5 through the vacuum hose 8. Of the two remaining vacuum connection ports 4 of the vacuum hood with the internal four-way air duct 5, seal one and connect the other to an external vacuum pumping device through the vacuum hose 8.

[0067] In summary, based on the above logic, when all selected vacuum hoods are vacuum hoods with internal multi-channel air guide tubes 5, under the premise that all vacuum hoods are connected in a “one” series, single-loop closed-loop series and / or multi-loop closed-loop series through vacuum hoses 8, one of the remaining vacuum guide nozzles 4 can be randomly selected to connect to an external vacuum pumping device through vacuum hoses 8, and all other vacuum guide nozzles 4 can be blocked or sealed by using vacuum hoses 8.

[0068] Example 8

[0069] This embodiment discloses a vacuum hoisting method. As a preferred embodiment of the present invention, it employs a vacuum hood as described in Embodiments 1, 2, 3, or 4, and includes the following steps:

[0070] S1. Determine the required number of vacuum chambers based on the structure and weight of the part 9 to be lifted. The larger the volume and the heavier the weight of the part 9 to be lifted, the more vacuum chambers are required.

[0071] Considering the different densities of the different parts 9 being lifted, including small-volume, heavy-weight parts and large-volume, light-weight parts, the method further includes selecting the appropriate vacuum hood model based on the structure and weight of the part 9 being lifted. Different models of vacuum hoods have different areas of vacuum adsorption surface at the bottom.

[0072] Therefore, for small-volume, heavy parts, a smaller number of vacuum hoods with large bottom vacuum adsorption surface areas can be selected; for large-volume, light-weight parts, a smaller number of vacuum hoods with large bottom vacuum adsorption surface areas or a larger number of vacuum hoods with small bottom vacuum adsorption surface areas can be selected. For parts with multiple surfaces of different sizes, multiple vacuum hoods with different bottom vacuum adsorption surface areas can be selected for each surface. In summary, this technical solution allows for the flexible selection and combination of vacuum hoods according to actual needs.

[0073] S2, use vacuum hoses 8 to connect all vacuum hoods to the vacuum pumping equipment, and refer to embodiments 5, 6 and 7 for specific connection methods.

[0074] S3, the vacuum chamber is placed according to the structural layout of the hoisted part 9.

[0075] S4. Start the vacuum equipment to create a vacuum condition for the hoisted part 9 through the vacuum hood until all vacuum hoods are completely suctioned to the hoisted part 9.

[0076] S5, connect the hook of the hoisting equipment to the connecting ring 2 of the vacuum hood, and start the hoisting equipment to lift the part 9 to the destination.

[0077] S6, turn off the vacuum equipment, and after confirming that the vacuum cover has detached from the adsorption state of the hoisted part 9, remove all vacuum covers and return them to their original positions.

Claims

1. A vacuum lifting method, characterized by: A vacuum cover is adopted, which comprises a sealed cover body (1); a connecting ring (2) for connecting a hook is integrally arranged on the top of the sealed cover body (1); an annular groove (3) with an inner concave and outer convex structure is arranged on the bottom of the sealed cover body (1), a vacuum extraction through hole is arranged in the middle of the annular groove (3), a plurality of air guide through holes are arranged on the side of the sealed cover body (1), and a vacuum guide connecting nozzle (4) is arranged in the air guide through hole; a two-way or multi-way air guide pipe (5) is arranged in the sealed cover body (1), one end of the air guide pipe (5) is connected to the vacuum extraction through hole, and the remaining ends are connected to the vacuum guide connecting nozzles (4) one by one; the vacuum lifting method comprises the following steps: S1, determining the required number of vacuum covers according to the structure and weight of the lifted part (9); S2, connecting all the vacuum covers with the vacuum extraction equipment by using a vacuum hose (8), wherein: when there is only one vacuum cover, a two-way air guide pipe (5) is arranged in the vacuum cover, only one vacuum guide connecting nozzle (4) is arranged on the sealed cover body (1) of the vacuum cover, and the vacuum guide connecting nozzle (4) is connected to the vacuum extraction equipment through the vacuum hose (8); when there are two or more vacuum covers, a four-way air guide pipe (5) is arranged in one of the vacuum covers, three vacuum guide connecting nozzles (4) are arranged on the sealed cover body (1) of the vacuum cover; a three-way air guide pipe (5) is arranged in the remaining vacuum covers, two vacuum guide connecting nozzles (4) are arranged on the sealed cover body (1) of the vacuum cover; all the vacuum covers are connected in sequence based on the vacuum guide connecting nozzles (4) by using the vacuum hose (8) to form a closed loop, and the remaining ports of the four-way air guide pipe (5) are connected to the vacuum extraction equipment through the vacuum hose (8); S3, arranging the vacuum covers according to the structure of the lifted part (9); S4, starting the vacuum extraction equipment to create a vacuum condition for the lifted part (9) through the vacuum cover until all the vacuum covers are tightly adsorbed to the lifted part (9); 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; S6, after the vacuum cover is separated from the adsorption state of the lifted part (9), all the vacuum covers are removed and returned to the original position.

2. A vacuum lifting method as claimed in claim 1, characterized in that: The sealed cover body (1) of the vacuum cover is in a circular truncated cone structure.

3. A vacuum lifting method as claimed in claim 1, characterized in that: The connecting ring (2) of the vacuum cover is in a semicircular arc shape.

4. A vacuum lifting method as claimed in claim 1, characterized in that: The top of the sealed cover body (1) of the vacuum cover is provided with a semicircular groove (6).

5. A vacuum lifting method as claimed in claim 1, characterized in that: The bottom of the sealed cover body (1) of the vacuum cover is provided with an inner convex and outer concave vacuum extraction extension groove (7) at the position in the middle of the annular groove (3).

6. The vacuum lifting method of claim 1, wherein, In step S1, the model of the required vacuum cover is selected according to the structure and weight of the lifted part (9), and the area of the vacuum adsorption surface at the bottom of the vacuum cover of different models is different.

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