Buoyancy type lifting device

Abstract

The utility model discloses a buoyancy type lifting device, a driving device of a cargo carrying plate comprises a first buoyancy plate and a second buoyancy plate, and the first buoyancy plate and the second buoyancy plate can ascend and descend under the action of buoyancy. When the cargo carrying plate needs to be controlled to ascend and descend, the first water conveying device and the second water conveying device work to drive the first buoyancy plate and the second buoyancy plate to ascend and descend, the first buoyancy plate and the second buoyancy plate can drive the cargo carrying plate to ascend and descend when ascending and descending, and therefore ascending and descending of articles are achieved; according to the invention, non-contact connection between the cargo carrying plate and the first buoyancy plate and between the cargo carrying plate and the second buoyancy plate can be realized, in addition, static electricity generated by electrical devices, mechanical transportation and the like is isolated, so that detonation of inflammable explosives is avoided, and the conveying safety is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of logistics, in particular to a buoyancy type lifting device. Background Art

[0002] In the prior art, pyrotechnics are mainly transported by vacuum transport devices. However, due to the risk of explosion of pyrotechnics, the transport volume per transport is limited, resulting in low transport efficiency.

[0003] The use of ordinary roller conveying devices is more dangerous than vacuum conveying devices because they are affected by factors such as roller friction and conveying power supply.

[0004] Therefore, how to improve the transportation safety of pyrotechnics is a technical problem that those skilled in the art currently need to solve. Utility Model Content

[0005] The purpose of the utility model is to provide a buoyancy type lifting device, which can effectively improve the safety of transportation.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A buoyancy lifting device comprising:

[0008] a first water delivery device, a first lifting water tank, a first buoyancy plate, and a first magnet, wherein the first water delivery device is in communication with the interior of the first lifting water tank and is used to control the water level in the first lifting water tank; the first buoyancy plate is disposed in the first lifting water tank; and the first magnet is disposed on one side of the first buoyancy plate;

[0009] a second water delivery device, a second lifting water tank, a second buoyancy plate, and a second magnet, wherein the second water delivery device is in communication with the interior of the second lifting water tank and is used to control the water level in the second lifting water tank, the second buoyancy plate is disposed in the second lifting water tank, and the second magnet is disposed on one side of the second buoyancy plate;

[0010] A cargo plate, the cargo plate is located between the first lifting water tank and the second lifting water tank, one side of the cargo plate is provided with a third magnet that is attracted to the first magnet, and the other side of the cargo plate is provided with a fourth magnet that is attracted to the second magnet, and the first buoyancy plate and the second buoyancy plate are used to drive the cargo plate to rise and fall.

[0011] In some embodiments, the first water delivery device includes a first regulating water tank, a first water inlet pipe, a first water inlet pump, a first water outlet pipe, and a first water outlet pump, wherein both ends of the first water inlet pipe are respectively connected to the first regulating water tank and the first lifting water tank, the first water inlet pump is provided on the first water inlet pipe, and the first water inlet pump is used to deliver water in the first regulating water tank to the first lifting water tank, the both ends of the first water outlet pipe are respectively connected to the first regulating water tank and the first lifting water tank, the first water outlet pump is provided on the first water outlet pipe, and the first water outlet pump is used to deliver water in the first lifting water tank to the first regulating water tank;

[0012] The second water delivery device includes a second regulating water tank, a second water inlet pipe, a second water inlet pump, a second water outlet pipe and a second water outlet pump. The two ends of the second water inlet pipe are respectively connected to the second regulating water tank and the second lifting water tank. The second water inlet pump is arranged on the second water inlet pipe. The second water inlet pump is used to transport the water in the second regulating water tank to the second lifting water tank. The two ends of the second water outlet pipe are respectively connected to the second regulating water tank and the second lifting water tank. The second water outlet pump is arranged on the second water outlet pipe. The second water outlet pump is used to transport the water in the second lifting water tank to the second regulating water tank.

[0013] In some embodiments, a vertically arranged first partition is provided in the first lifting water tank, the first partition dividing the inner cavity of the first lifting water tank into a first buoyancy chamber and a first water level regulating chamber, a side wall of the first water level regulating chamber is provided with a first water inlet hole connected to the first water inlet pipe, and a first water outlet hole connected to the first water outlet pipe, and a first connecting hole connecting the first buoyancy chamber and the first water level regulating chamber is provided on the first partition;

[0014] A vertically arranged second partition is provided in the second lifting water tank, and the second partition divides the inner cavity of the second lifting water tank into a second buoyancy chamber and a second water level regulating chamber. The side wall of the second water level regulating chamber is provided with a second water inlet hole connected to the second water inlet pipe, and a second water outlet hole connected to the second water outlet pipe. The second partition is provided with a second connecting hole connecting the second buoyancy chamber and the second water level regulating chamber.

[0015] In some embodiments, a first internal sliding track extending in a vertical direction is provided in the first buoyancy chamber, and the side of the first buoyancy plate is slidably connected to the first internal sliding track; a second internal sliding track extending in a vertical direction is provided in the second buoyancy chamber, and the side of the second buoyancy plate is slidably connected to the second internal sliding track.

[0016] In some embodiments, a first external sliding track extending in a vertical direction is provided outside the first buoyancy chamber, and a second external sliding track extending in a vertical direction is provided outside the second buoyancy chamber, and both sides of the cargo plate are respectively slidably connected to the first external sliding track and the second external sliding track.

[0017] In some embodiments, first rollers cooperating with the first inner sliding track are provided on both sides of the first buoyancy plate, and second rollers cooperating with the second inner sliding track are provided on both sides of the second buoyancy plate.

[0018] In some embodiments, a first buoyancy box is provided at the bottom of the first buoyancy board, and a second buoyancy box is provided at the bottom of the second buoyancy board.

[0019] In some embodiments, the buoyancy lifting device includes two groups of the first water supply device, the first lifting water tank, the first buoyancy plate, the first magnet, the second water supply device, the second lifting water tank, the second buoyancy plate, the second magnet, the cargo plate, the third magnet and the fourth magnet, and the two groups of the cargo plates are lifted and lowered alternately.

[0020] Compared with the existing technology, the above technical solution has at least the following advantages:

[0021] The utility model provides a buoyancy lifting device. When it is necessary to control the lifting of the cargo plate, the first water supply device and the second water supply device work to drive the first buoyancy plate and the second buoyancy plate to rise and fall. The first buoyancy plate and the second buoyancy plate can drive the cargo plate to rise and fall when they are lifted and lowered, thereby realizing the lifting of items. The adsorption relationship between the magnets can realize non-contact connection between the cargo plate and the first buoyancy plate and the second buoyancy plate. In addition, the static electricity generated by electrical devices and mechanical transportation is isolated, thereby avoiding the explosion of flammable and explosive items, thereby ensuring the safety of transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of a buoyancy lifting device provided in a specific embodiment of the present utility model;

[0024] Figure 2 A schematic structural diagram of a first lifting water tank of a buoyancy lifting device provided in a specific embodiment of the present utility model;

[0025] Figure 3 A schematic cross-sectional view of a first lifting water tank of a buoyancy-type lifting device provided in a specific embodiment of the present invention;

[0026] Figure 4 This is a schematic structural diagram of a buoyancy lifting device provided by a specific embodiment of the present invention after the first buoyancy plate, the first magnet and the first roller are assembled;

[0027] Figure 5 A schematic structural diagram of a first buoyancy plate of a buoyancy lifting device provided in a specific embodiment of the present utility model;

[0028] Figure 6 This is a structural schematic diagram of a first buoyancy box of a buoyancy type lifting device provided in a specific embodiment of the present utility model.

[0029] The reference numerals are as follows:

[0030] 10-first water delivery device, 11-first regulating water tank, 12-first water inlet pipe, 13-first water inlet pump, 14-first water outlet pipe, 15-first water outlet pump;

[0031] 20 - first lifting water tank, 21 - first partition, 22 - first buoyancy chamber, 23 - first water level regulating chamber, 24 - first inner sliding track, 25 - first outer sliding track, 26 - first water inlet, 27 - first water outlet;

[0032] 30-first buoyancy plate, 31-first magnet, 32-first roller, 33-first mounting slot;

[0033] 40 - second water delivery device, 41 - second regulating water tank, 42 ​​- second water inlet pipe, 43 - second water inlet pump, 44 - second water outlet pipe, 45 - second water outlet pump;

[0034] 50-Second lifting water tank;

[0035] 60-second buoyancy board;

[0036] 70-cargo board;

[0037] 80-first buoyancy tank, 81-connection hole. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Please refer to Figures 1-6 .

[0040] The embodiment of the present invention provides a buoyancy lifting device, comprising: a first water supply device 10, a first lifting water tank 20, a first buoyancy plate 30 and a first magnet 31. The first water supply device 10 is connected to the interior of the first lifting water tank 20 for controlling the water level in the first lifting water tank 20. For example, when the first water supply device 10 injects water into the first lifting water tank 20, the water level rises, and when the first water supply device 10 removes water from the first lifting water tank 20, the water level drops. The first buoyancy plate 30 is arranged in the first lifting water tank 20. The first buoyancy plate 30 can be raised and lowered according to the rise and fall of the water level. The first magnet 31 is arranged on one side of the first buoyancy plate 30. For example, a first mounting groove 33 can be provided in the first buoyancy plate 30, and the first magnet 31 is placed in the first mounting groove 33. The buoyancy lifting device also comprises a second water supply device 40, a second lifting water tank, a second buoyancy plate and a second magnet. The second water supply device 40 is connected to the interior of the second lifting water tank for controlling the water level in the second lifting water tank. When the second water supply device 40 injects water into the second lifting water tank, the water level rises, and when the second water supply device 40 discharges water from the second lifting water tank, the water level drops. The second buoyancy plate is arranged in the second lifting water tank, and the second buoyancy plate can rise and fall according to the rise and fall of the water level. The second magnet is arranged on one side of the second buoyancy plate, and the second magnet can be installed in the installation groove in the second buoyancy plate, wherein the first lifting water tank 20 and the second lifting water tank have the same structure; the buoyancy lifting device also includes a cargo plate, which is located between the first lifting water tank 20 and the second lifting water tank. The first lifting water tank 20 and the second lifting water tank can be made of explosion-proof material. A third magnet that is attracted to the first magnet 31 is provided on one side of the cargo plate, and a fourth magnet that is attracted to the second magnet is provided on the other side of the cargo plate. The third magnet and the fourth magnet are installed in the installation grooves on both sides of the cargo plate, wherein the number of the first magnet 31, the second magnet, the third magnet and the fourth magnet can be selected as multiple, and are respectively distributed along the side straight lines of the corresponding plate. When it is necessary to control the lifting of the cargo plate, the first water supply device 10 and the second water supply device 40 work simultaneously to ensure the synchronous lifting of the first buoyancy plate 30 and the second buoyancy plate. The lifting height of the first buoyancy plate 30 and the second buoyancy plate is related to the water level of the first lifting water tank 20 and the second lifting water tank. The first buoyancy plate 30 and the second buoyancy plate can drive the cargo plate to rise and fall when lifting, thereby realizing the lifting of items. The adsorption relationship between the magnets can realize non-contact connection between the cargo plate and the first buoyancy plate 30 and the second buoyancy plate. In addition, the static electricity generated by electrical devices and mechanical transportation is isolated, thereby avoiding the explosion of flammable and explosive items, thereby ensuring the safety of transportation.

[0041] In some embodiments, the first water delivery device 10 includes a first regulating water tank 11, a first water inlet pipe 12, a first water inlet pump 13, a first water outlet pipe 14 and a first water outlet pump 15. The two ends of the first water inlet pipe 12 are respectively connected to the first regulating water tank 11 and the first lifting water tank 20. The first water inlet pump 13 is arranged on the first water inlet pipe 12. The first water inlet pipe 12 can be optionally a curved pipe, such as a "J"-shaped curved pipe. The first water pump is arranged in the middle of the curved pipe. The first water inlet pump 13 is used to transport the water in the first regulating water tank 11 to the first lifting water tank 20. The two ends of the first water outlet pipe 14 are respectively connected to the first regulating water tank 11 and the first lifting water tank 20. The first water outlet pump 15 is arranged on the first water outlet pipe 14. The first water outlet pipe 14 can be optionally a straight pipe. The first water pump is arranged in the middle of the first water outlet pipe 14. The first water outlet pump 15 is used to transport the water in the first lifting water tank 20 to the first Regulating the water tank 11; the second water delivery device 40 includes a second regulating water tank 41, a second water inlet pipe 42, a second water inlet pump 43, a second water outlet pipe 44 and a second water outlet pump 45. The two ends of the second water inlet pipe 42 are respectively connected to the second regulating water tank 41 and the second lifting water tank. The second water inlet pump 43 is arranged on the second water inlet pipe 42. The second water inlet pipe 42 can be selected as a bend, such as a "J"-shaped bend. The second water pump is arranged in the middle of the bend. The second water inlet pump 43 is used to transport the water in the second regulating water tank 41 to the second lifting water tank. The two ends of the second water outlet pipe 44 are respectively connected to the second regulating water tank 41 and the second lifting water tank. The second water outlet pump 45 is arranged on the second water outlet pipe 44. The second water outlet pipe 44 can be selected as a straight pipe. The second water pump is arranged in the middle of the second water outlet pipe 44. The second water outlet pump 45 is used to transport the water in the second lifting water tank to the second regulating water tank 41.

[0042] In some embodiments, a vertically arranged first partition 21 is provided in the first lifting water tank 20, and the first partition 21 divides the inner cavity of the first lifting water tank 20 into a first buoyancy chamber 22 and a first water level regulating chamber 23. The side wall of the first water level regulating chamber 23 is provided with a first water inlet hole 26 connected to the first water inlet pipe 12, and a first water outlet hole 27 connected to the first water outlet pipe 14. The first partition 21 is provided with a first connecting hole connecting the first buoyancy chamber 22 and the first water level regulating chamber 23. When the first water pump transports water to the first water level regulating chamber 23, under the action of the first connecting hole, the water level in the first buoyancy chamber 22 will also rise. Similarly, when the water level in the first water level regulating chamber 23 drops, the water level in the first buoyancy chamber 22 drops synchronously. The first water level regulating chamber 23 can ensure that the water level in the first buoyancy chamber 22 rises. The water level in the second buoyancy chamber rises and the water level in the second buoyancy chamber drops. The second buoyancy chamber is connected to the water level regulating chamber by the second water pump, and the lifting and lowering stability of the first buoyancy chamber is ensured.

[0043] In some embodiments, a first internal sliding track 24 extending in the vertical direction is provided in the first buoyancy chamber 22, and the side of the first buoyancy plate 30 is slidably connected to the first internal sliding track 24. For example, when the first buoyancy chamber 22 and the first water level regulating chamber 23 are distributed left and right, two L-shaped guide rails extending in the vertical direction are respectively provided on the left and right side walls of the first buoyancy chamber 22, wherein the bending portions of the two L-shaped guide rails on the left side wall extend toward each other, and the bending portions of the two L-shaped guide rails on the right side wall also extend toward each other, and the left and right ends of the first buoyancy plate 30 are respectively slidably connected to the first buoyancy chamber 2 2; a second internal sliding track extending vertically is provided within the second buoyancy chamber, to which the side portions of the second buoyancy plate are slidably connected. Similarly, when the second buoyancy chamber and the second water level regulating chamber are distributed left and right, two vertically extending L-shaped guide rails are provided on the left and right side walls of the second buoyancy chamber, respectively. The two L-shaped guide rails on the left side wall have bent portions extending toward each other, and the two L-shaped guide rails on the right side wall also have bent portions extending toward each other. The left and right ends of the second buoyancy plate are slidably connected to the left and right L-shaped guide rails within the second buoyancy chamber, respectively. The first internal sliding track 24 and the second internal sliding track effectively improve the stability of the first buoyancy plate 30 and the second buoyancy plate during lifting and lowering.

[0044] In some embodiments, a first external sliding rail 25 extending in a vertical direction is provided outside the first buoyancy chamber 22, and a second external sliding rail extending in a vertical direction is provided outside the second buoyancy chamber. The structure of the first external sliding rail 25 and the second external sliding rail is the same as the structure of the first internal sliding rail 24 and the second internal sliding rail, and the first external sliding rail 25 and the first internal sliding rail 24 are integrally formed in the first lifting water tank 20, and the second external sliding rail and the second internal sliding rail are integrally formed in the second lifting water tank. The two sides of the cargo plate are respectively slidably connected to the first external sliding rail 25 and the second external sliding rail, wherein the structures of the cargo plate, the first buoyancy plate 30 and the second buoyancy plate can be the same.

[0045] In some embodiments, first rollers 32 that cooperate with the first internal sliding track 24 are provided on both sides of the first buoyancy plate 30. For example, a first support can be provided on the side of the first buoyancy plate 30, and the first roller 32 is rotatably connected to the first support. Second rollers that cooperate with the second internal sliding track are provided on both sides of the second buoyancy plate. For example, a second support can be provided on the side of the second buoyancy plate, and the second roller is rotatably connected to the second support. The first roller 32 and the second roller can effectively reduce wear and improve the smoothness of lifting and lowering.

[0046] In some embodiments, a first buoyancy box 80 is provided at the bottom of the first buoyancy board 30. For example, a flange is provided at the top of the first buoyancy box 80, and a connecting hole 81 is provided on the flange. The first buoyancy box 80 can be bolted into the connecting hole 81 to be connected to the first buoyancy board 30. A second buoyancy box is provided at the bottom of the second buoyancy board, and the second buoyancy box can also be connected to the bottom of the second buoyancy board by bolts. The buoyancy of the buoyancy board can be effectively improved by the buoyancy box.

[0047] In some embodiments, the buoyancy lifting device includes two sets of a first water supply device 10, a first lifting water tank 20, a first buoyancy plate 30, a first magnet 31, a second water supply device 40, a second lifting water tank, a second buoyancy plate, a second magnet, a cargo plate, a third magnet, and a fourth magnet. The two sets of cargo plates are raised and lowered alternately. The connection method of each set of the above structures can refer to the connection method in the above embodiments. The alternating operation of the two sets of structures can effectively improve transportation efficiency. The first lifting water tank 20 and the second lifting water tank of the two sets of structures can be integrally formed.

[0048] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0049] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0050] The above is a detailed introduction to the buoyancy lifting device provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified. These improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A buoyancy lifting device, characterized in that: include: a first water delivery device (10), a first lifting water tank (20), a first buoyancy plate (30) and a first magnet (31); the first water delivery device (10) is in communication with the interior of the first lifting water tank (20) and is used to control the water level in the first lifting water tank (20); the first buoyancy plate (30) is disposed in the first lifting water tank (20); and the first magnet (31) is disposed on one side of the first buoyancy plate (30); a second water delivery device (40), a second lifting water tank (50), a second buoyancy plate (60) and a second magnet, wherein the second water delivery device (40) is in communication with the interior of the second lifting water tank (50) and is used to control the water level in the second lifting water tank (50), the second buoyancy plate (60) is disposed in the second lifting water tank (50), and the second magnet is disposed on one side of the second buoyancy plate (60); A cargo plate (70), the cargo plate (70) being located between the first lifting water tank (20) and the second lifting water tank (50), a third magnet being attracted to the first magnet (31) being provided on one side of the cargo plate (70), a fourth magnet being attracted to the second magnet being provided on the other side of the cargo plate (70), the first buoyancy plate (30) and the second buoyancy plate (60) being used to drive the cargo plate (70) to rise and fall.

2. The buoyancy lifting device according to claim 1, characterized in that: The first water delivery device (10) comprises a first regulating water tank (11), a first water inlet pipe (12), a first water inlet pump (13), a first water outlet pipe (14) and a first water outlet pump (15); the two ends of the first water inlet pipe (12) are respectively connected to the first regulating water tank (11) and the first lifting water tank (20); the first water inlet pump (13) is arranged on the first water inlet pipe (12); the first water inlet pump (13) is used to deliver water in the first regulating water tank (11) to the first lifting water tank (20); the two ends of the first water outlet pipe (14) are respectively connected to the first regulating water tank (11) and the first lifting water tank (20); the first water outlet pump (15) is arranged on the first water outlet pipe (14); the first water outlet pump (15) is used to deliver water in the first lifting water tank (20) to the first regulating water tank (11); The second water delivery device (40) comprises a second regulating water tank (41), a second water inlet pipe (42), a second water inlet pump (43), a second water outlet pipe (44) and a second water outlet pump (45). The two ends of the second water inlet pipe (42) are respectively connected to the second regulating water tank (41) and the second lifting water tank (50). The second water inlet pump (43) is arranged on the second water inlet pipe (42). The second water inlet pump (43) is used to deliver water in the second regulating water tank (41) to the second lifting water tank (50). The two ends of the second water outlet pipe (44) are respectively connected to the second regulating water tank (41) and the second lifting water tank (50). The second water outlet pump (45) is arranged on the second water outlet pipe (44). The second water outlet pump (45) is used to deliver water in the second lifting water tank (50) to the second regulating water tank (41).

3. The buoyancy lifting device according to claim 2, characterized in that: A vertically arranged first partition (21) is provided in the first lifting water tank (20), and the first partition (21) divides the inner cavity of the first lifting water tank (20) into a first buoyancy chamber (22) and a first water level regulating chamber (23). A first water inlet hole (26) communicating with the first water inlet pipe (12) and a first water outlet hole (27) communicating with the first water outlet pipe (14) are provided on the side wall of the first water level regulating chamber (23). A first connecting hole connecting the first buoyancy chamber (22) and the first water level regulating chamber (23) is provided on the first partition (21); A second partition plate is vertically provided in the second lifting water tank (50), and the second partition plate divides the inner cavity of the second lifting water tank (50) into a second buoyancy chamber and a second water level regulating chamber. A second water inlet hole connected to the second water inlet pipe (42) and a second water outlet hole connected to the second water outlet pipe (44) are provided on the side wall of the second water level regulating chamber. A second connecting hole connecting the second buoyancy chamber and the second water level regulating chamber is provided on the second partition plate.

4. The buoyancy lifting device according to claim 3, characterized in that: A first internal sliding track (24) extending in a vertical direction is provided in the first buoyancy chamber (22), and the side of the first buoyancy plate (30) is slidably connected to the first internal sliding track (24); a second internal sliding track extending in a vertical direction is provided in the second buoyancy chamber, and the side of the second buoyancy plate (60) is slidably connected to the second internal sliding track.

5. The buoyancy lifting device according to claim 4, characterized in that: A first external sliding track (25) extending in a vertical direction is provided outside the first buoyancy chamber (22), a second external sliding track extending in a vertical direction is provided outside the second buoyancy chamber, and two sides of the cargo plate (70) are slidably connected to the first external sliding track (25) and the second external sliding track, respectively.

6. The buoyancy lifting device according to claim 4, characterized in that: First rollers (32) cooperating with the first internal sliding track (24) are provided on both sides of the first buoyancy plate (30), and second rollers cooperating with the second internal sliding track are provided on both sides of the second buoyancy plate (60).

7. The buoyancy lifting device according to claim 1, characterized in that: A first buoyancy box (80) is provided at the bottom of the first buoyancy plate (30), and a second buoyancy box is provided at the bottom of the second buoyancy plate (60).

8. The buoyancy lifting device according to any one of claims 1 to 7, characterized in that: The buoyancy lifting device comprises two groups of the first water supply device (10), the first lifting water tank (20), the first buoyancy plate (30), the first magnet (31), the second water supply device (40), the second lifting water tank (50), the second buoyancy plate (60), the second magnet, the cargo plate (70), the third magnet and the fourth magnet, and the two groups of the cargo plates (70) are alternately lifted and lowered.

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