A device for solving ultrafiltration membrane fouling using a detachable threaded pump.

Abstract

This invention provides a device for solving ultrafiltration membrane fouling using a detachable spiral pump, relating to the field of ultrafiltration membrane technology. It includes a platform with a detachable spiral pump fixedly mounted on its top. The output end of the detachable spiral pump is fixedly connected to a connecting pipe. A top plate is provided on the top of the platform, with a switching mechanism on its top and a lifting mechanism at its bottom. By incorporating the switching mechanism, the sealing plug disengages from the second pipe during hydraulic rod operation, allowing microbubbles generated by the detachable spiral pump to enter the interior of the cylinder and treat the ultrafiltration membrane. This makes the device easy to operate and avoids microbubble leakage when the valve of the detachable spiral pump is opened when there is no ultrafiltration membrane inside the cylinder. It also improves the sealing performance of the detachable spiral pump. When the switching mechanism is open, it increases the efficiency of cleaning the ultrafiltration membrane when it comes into contact with the microbubbles generated by the detachable spiral pump.

Description

Technical Field

[0001] This invention relates to the field of ultrafiltration membrane technology, and in particular to a device for solving ultrafiltration membrane fouling using a detachable threaded pump. Background Technology

[0002] Ultrafiltration membranes are artificial membranes used in the ultrafiltration process. They are generally made of polymeric materials such as cellulose acetate, cellulose acetate esters, polyethylene, polysulfone, and polyamide. They are usually prefabricated into various types of membrane modules, such as tubular, plate, spiral wound, and capillary, and then multiple modules are assembled together for use to increase the filtration area and facilitate maintenance.

[0003] However, in existing technologies, ultrafiltration membranes usually need to be cleaned when they become contaminated. The main cleaning methods for ultrafiltration membranes are physical cleaning and chemical cleaning. Physical cleaning requires frequent cleaning, making the process relatively troublesome. Chemical cleaning, on the other hand, poses environmental pollution problems, easily causing environmental contamination. Consequently, there is no truly effective cleaning method for ultrafiltration membranes, which can easily reduce cleaning efficiency and severely affect the cleaning effect. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies. Common methods for cleaning ultrafiltration membranes are physical cleaning and chemical cleaning, which can make cleaning ultrafiltration membranes relatively troublesome and easily cause environmental pollution. As a result, there is no relatively good cleaning method for ultrafiltration membranes, which can easily reduce the cleaning efficiency of ultrafiltration membranes and seriously affect the cleaning effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a device for solving ultrafiltration membrane fouling using a detachable spiral pump, comprising a platform, a detachable spiral pump fixedly mounted on the top of the platform, a connecting pipe fixedly connected to the output end of the detachable spiral pump, a top plate provided on the top of the platform, a switching mechanism provided on the top of the top plate, a lifting mechanism provided at the bottom of the top plate, a support rod fixedly connected to the bottom of the top plate, a fixing mechanism provided on the top of the platform, and a cylinder provided on the top of the platform. The switching mechanism includes a first pipe. The left end of the first pipe is connected to the right end of the connecting pipe. A base plate is fixedly connected to the top of the top plate. A hydraulic rod is fixedly installed on the top of the base plate. A guardrail is fitted on the outer surface of the hydraulic rod. A fixing plate is fixedly connected to the top of the guardrail. A support rod is fixedly connected to the output end of the hydraulic rod. A vertical rod is fixedly connected to the bottom of the support rod. A first sealing disc is fixedly fitted on the outer surface of the vertical rod. A second sealing disc is fixedly fitted on the outer surface of the vertical rod. A second pipe is fixedly connected to the top of the top plate. A sealing plug is provided at the bottom end of the vertical rod.

[0006] In a preferred embodiment, the bottom end of the vertical rod slides through the outer surface of the first pipe, the bottom of the first sealing disc contacts the outer surface of the first pipe, and the top of the second sealing disc contacts the inner wall of the first pipe.

[0007] The beneficial effect of adopting the above-mentioned further solution is that, through the first sealing disc and the second sealing disc, the switching mechanism has the characteristic of providing good sealing for the first pipeline.

[0008] In a preferred embodiment, the top end of the second pipe is fixedly connected to the outer surface of the first pipe, and the outer surface of the sealing plug is in contact with the inner wall of the second pipe.

[0009] The beneficial effect of adopting the above-mentioned further solution is that the second pipe has good sealing characteristics by using a sealing plug.

[0010] In a preferred embodiment, the lifting mechanism includes a first fixed rod, the top end of which is fixedly connected to the bottom of a top plate. A second fixed rod is provided at the bottom of the top plate, and a connecting plate is fixedly connected to the bottom end of the second fixed rod. A top cover is provided at the bottom of the connecting plate. A third connecting rod is fixedly connected to the bottom of the frame rod, and a disc is fixedly connected to the bottom end of the third connecting rod. A frame is fixedly connected to the top of the top plate, and a pull rope is fixedly connected to the top of the disc. A rope reel is movably connected to the top of the frame via a pivot. A first limiting rod slides through the bottom end of the first fixed rod, and a tension spring is sleeved on the outer surface of the first limiting rod. A first limiting disc is fixedly connected to the top end of the first limiting rod. A second limiting rod slides through the top end of the second fixed rod, and a second limiting disc is fixedly connected to the bottom end of the second limiting rod.

[0011] The beneficial effect of adopting the above-mentioned further solution is that by setting up a lifting mechanism, the top cover can seal the cylinder when the device processes the ultrafiltration membrane.

[0012] In a preferred embodiment, the outer surface of the pull rope is in contact with the outer surface of the rope disc, and the top of the top plate and the top of the first fixing rod are both provided with sliding holes adapted to the pull rope. The end of the pull rope away from the disc is fixedly connected to the top of the first limiting disc.

[0013] The beneficial effect of adopting the above-mentioned further solution is that the switching mechanism and the lifting mechanism can be mutually driven by using a pull rope.

[0014] In a preferred embodiment, the bottom end of the first limiting rod is fixedly connected to the top of the connecting plate, and the inside of the first fixed rod is provided with a first limiting groove that matches the first limiting plate. The bottom end of the tension spring is welded to the bottom surface of the inner wall of the first limiting groove, and the top end of the tension spring is welded to the bottom of the first limiting plate. The top end of the second limiting rod is fixedly connected to the bottom of the top plate, and the inside of the second fixed rod is provided with a second limiting groove that matches the second limiting plate. The inner wall of the top cover is in contact with the outer surface of the cylinder.

[0015] The beneficial effect of adopting the above-mentioned further solution is that by setting a tension spring, the pull rope can be kept in a good state of tension.

[0016] In a preferred embodiment, the fixing mechanism includes a base, the bottom of which is fixedly connected to the top of the platform. A fixing ring is movably connected to the outer surface of the base via a hinge. A pull plate is provided on the outer surface of the base. A fixing block is fixedly connected to the outer surface of the base. A buckle block is fixedly connected to the bottom of the pull plate. A buckle ring is fixedly connected to the outer surface of the fixing ring. A fourth connecting rod is fixedly connected to the bottom of the pull plate. A spring is sleeved on the outer surface of the fourth connecting rod. A third limiting plate is fixedly connected to the bottom end of the fourth connecting rod.

[0017] The beneficial effect of adopting the above-mentioned further solution is that by setting a fixing mechanism, the cylinder has good stability when the ultrafiltration membrane is processed by the cylinder.

[0018] In a preferred embodiment, the inner wall of the fixing ring is in contact with the outer surface of the cylinder, the bottom end of the fourth connecting rod slides through the top of the fixing block, the inside of the fixing block is provided with a third limiting groove that is adapted to the third limiting plate, the top end of the spring is welded to the top surface of the inner wall of the third limiting groove, and the bottom end of the spring is welded to the top of the third limiting plate.

[0019] The beneficial effect of adopting the above-mentioned further solution is that by using buckles and buckles to fix the fixing ring to the base, the stability of the cylinder on the fixed seat is improved.

[0020] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0021] In this invention, by setting a switching mechanism, the sealing plug disengages from the second pipe when the hydraulic rod is running, allowing the microbubbles generated by the centrifugal pump to enter the interior of the cylinder to treat the ultrafiltration membrane. This makes the device easy to operate and avoids the phenomenon of microbubble leakage when the valve of the centrifugal pump is opened when there is no ultrafiltration membrane inside the cylinder. It also improves the sealing performance of the device for the centrifugal pump. When the switching mechanism is open, it improves the efficiency of cleaning when the ultrafiltration membrane comes into contact with the microbubbles generated by the centrifugal pump.

[0022] In this invention, by setting up a lifting mechanism, the switching mechanism and the lifting mechanism are driven by a pull rope, so that the top cover on the lifting mechanism and the cylinder are sealed when the switching mechanism is running, ensuring that the ultrafiltration membrane has good sealing characteristics when it is processed inside the cylinder, thereby improving the processing effect of the ultrafiltration membrane.

[0023] In this invention, by setting a fixing mechanism, the cylinder has good stability when it is fixed to the base by a fixing ring, thereby improving the stability of the ultrafiltration membrane when it is processed inside the cylinder. Attached Figure Description

[0024] Figure 1 A perspective view of a device for solving ultrafiltration membrane fouling using a detachable threaded pump is provided for the present invention;

[0025] Figure 2 A perspective view of the switching mechanism of a device for solving ultrafiltration membrane fouling using a detachable threaded pump, as proposed in this invention;

[0026] Figure 3 A perspective view of the sealing plug of a device for solving ultrafiltration membrane fouling using a detachable threaded pump, as proposed in this invention;

[0027] Figure 4 A perspective cross-sectional view of the first fixed rod of a device for solving ultrafiltration membrane fouling using a detachable threaded pump, as proposed in this invention.

[0028] Figure 5 A perspective cross-sectional view of the second fixing rod of a device for solving ultrafiltration membrane fouling using a detachable threaded pump, as proposed in this invention;

[0029] Figure 6 This invention proposes a device for solving ultrafiltration membrane fouling using a detachable threaded pump. Figure 1 Enlarged 3D view at point A in the middle;

[0030] Figure 7This is a perspective cross-sectional view of the fixed block of a device for solving ultrafiltration membrane fouling using a detachable threaded pump, as proposed in this invention.

[0031] Legend:

[0032] 1. Platform; 2. Offset screw pump; 3. Connecting pipe; 4. Top plate; 5. Switching mechanism; 6. Lifting mechanism; 7. Support rod; 8. Fixing mechanism; 9. Cylinder;

[0033] 501. First pipe; 502. Base plate; 503. Hydraulic rod; 504. Guardrail; 505. Fixing plate; 506. Frame pole; 507. Vertical pole; 508. First sealing disc; 509. Second sealing disc; 510. Second pipe; 511. Sealing plug;

[0034] 601. First fixing rod; 602. Second fixing rod; 603. Connecting plate; 604. Top cover; 605. Third connecting rod; 606. Disc; 607. Frame; 608. Pull rope; 609. Rope reel; 610. First limiting rod; 611. Tension spring; 612. First limiting disc; 613. Second limiting rod; 614. Second limiting disc;

[0035] 801. Base; 802. Fixing ring; 803. Pull plate; 804. Fixing block; 805. Buckle block; 806. Buckle ring; 807. Fourth connecting rod; 808. Spring; 809. Third limit plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] like Figure 1-3As shown, the present invention provides a technical solution: a device for solving ultrafiltration membrane fouling using a detachable spiral pump, comprising a platform 1, a detachable spiral pump 2 fixedly mounted on the top of the platform 1, a connecting pipe 3 fixedly connected to the output end of the detachable spiral pump 2, a top plate 4 provided on the top of the platform 1, a switching mechanism 5 provided on the top of the top plate 4, a lifting mechanism 6 provided at the bottom of the top plate 4, a support rod 7 fixedly connected to the bottom of the top plate 4, a fixing mechanism 8 provided on the top of the platform 1, and a cylinder 9 provided on the top of the platform 1. The switching mechanism 5 includes a first pipe 501, the left end of which is connected to the right end of the connecting pipe 3. This connection allows microbubbles to properly contact the ultrafiltration membrane during operation of the centrifugal pump 2. A base plate 502 is fixedly connected to the top of the top plate 4. A hydraulic rod 503 is fixedly installed on the top of the base plate 502. A guardrail 504 is fitted onto the outer surface of the hydraulic rod 503, and a fixing plate 505 is fixedly connected to the top of the guardrail 504. The guardrail 504... Protective measures are added to the hydraulic rod 503. A support rod 506 is fixedly connected to the output end of the hydraulic rod 503. A vertical rod 507 is fixedly connected to the bottom of the support rod 506. The bottom end of the vertical rod 507 slides through the outer surface of the first pipe 501. The bottom of the first sealing disc 508 contacts the outer surface of the first pipe 501, and the top of the second sealing disc 509 contacts the inner wall of the first pipe 501. By utilizing the first sealing disc 508 and the second sealing disc 509, the first pipe 501 is kept in place. In the sealed state, a first sealing disc 508 is fixedly sleeved on the outer surface of the vertical rod 507, and a second sealing disc 509 is fixedly sleeved on the outer surface of the vertical rod 507. A second pipe 510 is fixedly connected to the top of the top plate 4. The top end of the second pipe 510 is fixedly connected to the outer surface of the first pipe 501. The outer surface of the sealing plug 511 is in contact with the inner wall of the second pipe 510. A sealing plug 511 is provided at the bottom end of the vertical rod 507. By providing the sealing plug 511, the second pipe 510 can be sealed.

[0039] In this embodiment, during use, the device is first powered on, the centrifugal pump 2 is turned on and the valve is opened, the hydraulic rod 503 is started, the hydraulic rod 503 drives the support rod 506 to move, and the support rod 506 drives the vertical rod 507 to move. The first sealing disc 508 disengages from the first pipe 501, and the second sealing disc 509 gradually comes into contact with the inside of the first pipe 501. The sealing plug 511 moves with the vertical rod 507 and gradually moves out of the inside of the second pipe 510 until the sealing plug 511 is completely disengaged from the second pipe 510. When the centrifugal pump 2 is running, it strongly mixes air and water inside the cylinder 9, gradually pressurizes and cuts to generate microbubbles. The microbubbles diffuse and slowly rise in the water and burst continuously around the ultrafiltration membrane, generating strong shock waves on the surface of the ultrafiltration membrane, removing and preventing pollutants from being adsorbed on the ultrafiltration membrane until the ultrafiltration membrane cleaning is completed.

[0040] Example 2

[0041] like Figure 1 , Figure 4 and Figure 5 As shown, the lifting mechanism 6 includes a first fixed rod 601, the top end of which is fixedly connected to the bottom of the top plate 4. A second fixed rod 602 is provided at the bottom of the top plate 4, and a connecting plate 603 is fixedly connected to the bottom end of the second fixed rod 602. A top cover 604 is provided at the bottom of the connecting plate 603, which provides good sealing for the cylinder 9. A third connecting rod 605 is fixedly connected to the bottom of the support rod 506, and a disc 606 is fixedly connected to the bottom end of the third connecting rod 605. A frame 607 is fixedly connected to the top of the top plate 4, and a pull rope 608 is fixedly connected to the top of the disc 606. The outer surface of the pull rope 608 contacts the outer surface of the rope disc 609. Sliding holes adapted to the pull rope 608 are provided at the top of the top of the top plate 4 and the top of the first fixing rod 601. The end of the pull rope 608 away from the disc 606 is fixedly connected to the top of the first limiting disc 612. By setting the pull rope 608, the lifting mechanism 6 and the switching mechanism 5 can drive each other. The top of the frame 607 is flexibly connected via a rotating shaft. A rope reel 609 is movably connected. The bottom end of the first fixing rod 601 slides through a first limiting rod 610. The bottom end of the first limiting rod 610 is fixedly connected to the top of the connecting plate 603. The interior of the first fixing rod 601 has a first limiting groove that matches the first limiting disc 612. The bottom end of the tension spring 611 is welded to the bottom surface of the inner wall of the first limiting groove, and the top end of the tension spring 611 is welded to the bottom of the first limiting disc 612. By setting the tension spring 611, the pull rope 608 can be kept taut. The second limiting... The top end of the positioning rod 613 is fixedly connected to the bottom of the top plate 4. The interior of the second fixing rod 602 is provided with a second limiting groove that matches the second limiting plate 614. The inner wall of the top cover 604 is in contact with the outer surface of the cylinder 9. The outer surface of the first limiting rod 610 is fitted with a tension spring 611. The top end of the first limiting rod 610 is fixedly connected to the first limiting plate 612. The top end of the second fixing rod 602 slides through the second limiting rod 613. The bottom end of the second limiting rod 613 is fixedly connected to the second limiting plate 614.

[0042] In this embodiment, during sealing, when the support rod 506 on the switch mechanism 5 moves, the third connecting rod 605 moves accordingly. The third connecting rod 605 drives the disc 606 to move, and the pull rope 608 slides on the rope disc 609. The tension spring 611 is no longer affected by external forces and its shape is restored. The pull rope 608 gradually enters the interior of the first fixed rod 601, and the first limiting rod 610 gradually moves out of the interior of the first fixed rod 601 and drives the connecting plate 603 to move. The top cover 604 at the bottom of the connecting plate 603 slowly moves towards the cylinder 9 until the top cover 604 is fitted onto the cylinder 9.

[0043] Example 3

[0044] like Figure 1 , Figure 6 and Figure 7 As shown, the fixing mechanism 8 includes a base 801, the bottom of which is fixedly connected to the top of the platform 1. A fixing ring 802 is movably connected to the outer surface of the base 801 via a hinge. The inner wall of the fixing ring 802 contacts the outer surface of the cylinder 9. The bottom end of the fourth connecting rod 807 slides through the top of the fixing block 804. The fixing block 804 has a third limiting groove inside that matches the third limiting plate 809. The top end of the spring 808 is welded to the top surface of the inner wall of the third limiting groove. The bottom end of 8 is welded to the top of the third limiting plate 809. A pull plate 803 is provided on the outer surface of the base 801. A fixing block 804 is fixedly connected to the outer surface of the base 801. A buckle block 805 is fixedly connected to the bottom of the pull plate 803. A buckle ring 806 is fixedly connected to the outer surface of the fixing ring 802. A fourth connecting rod 807 is fixedly connected to the bottom of the pull plate 803. A spring 808 is sleeved on the outer surface of the fourth connecting rod 807. The bottom end of the fourth connecting rod 807 is fixedly connected to the third limiting plate 809.

[0045] In this embodiment, during fixing, the cylinder 9 containing the ultrafiltration membrane is first placed on the base 801. The fixing ring 802 is gently rotated to move it. When the fixing ring 802 is about to contact the cylinder 9, the pull plate 803 is gently pulled to move it. The pull plate 803 drives the fourth connecting rod 807 to move. The spring 808 is affected by the external force and its shape contracts until the pull plate 803 can no longer move. Keep the pull plate 803 in place and continue to rotate the fixing ring 802 until the fixing ring 802 contacts the cylinder 9. Release the stationary pull plate 803, and the spring 808 will no longer be affected by the external force and its shape will return to its original shape. The pull plate 803 returns to its original position until the pull plate 803 contacts the buckle 806 on the fixing ring 802. The buckle 805 is inserted into the buckle 806.

[0046] Working principle:

[0047] like Figure 1-7As shown, during use, place the cylinder 9 containing the ultrafiltration membrane on the base 801, and gently rotate the fixing ring 802 to move it. When the fixing ring 802 is about to contact the cylinder 9, gently pull the pull plate 803 to move it. The pull plate 803 drives the fourth connecting rod 807 to move. The spring 808 contracts under the influence of external force until the pull plate 803 can no longer move. Keep the pull plate 803 in place and continue to rotate the fixing ring 802 until the fixing ring 802 contacts the cylinder 9. Release the stationary pull plate 803. Spring 808 is no longer affected by external forces and returns to its original shape. Pull plate 803 returns to its original position until pull plate 803 contacts the retaining ring 806 on fixed ring 802. Buckle block 805 is inserted into the retaining ring 806. Power is switched on, the disengaged screw pump 2 is turned on and the valve is opened, and hydraulic rod 503 is started. Hydraulic rod 503 drives frame rod 506 to move. When frame rod 506 moves, it drives vertical rod 507 to move. First sealing disc 508 disengages from first pipe 501, and second sealing disc 509 gradually contacts the inside of first pipe 501. When the parts come into contact, the sealing plug 511 moves along with the vertical rod 507 and gradually moves out of the second pipe 510 until the sealing plug 511 is completely separated from the second pipe 510. When the bracket rod 506 on the switch mechanism 5 moves, the third connecting rod 605 moves along with it. The third connecting rod 605 drives the disc 606 to move, and the pull rope 608 slides on the rope disc 609. The tension spring 611 is no longer affected by external forces and returns to its original shape. The pull rope 608 gradually enters the interior of the first fixed rod 601, and the first limiting rod 610 gradually... The first fixed rod 601 is gradually moved out and the connecting plate 603 is moved. The top cover 604 at the bottom of the connecting plate 603 slowly moves towards the cylinder 9 until the top cover 604 is fitted onto the cylinder 9. When the centrifugal pump 2 is running, it strongly mixes air and water inside the cylinder 9, pressurizes it step by step, and cuts it step by step to generate microbubbles. The microbubbles diffuse and rise slowly in the water and burst continuously around the ultrafiltration membrane, generating strong shock waves on the surface of the ultrafiltration membrane. This removes and prevents pollutants from being adsorbed onto the ultrafiltration membrane until the ultrafiltration membrane cleaning is completed.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A device for solving ultrafiltration membrane fouling using a detachable screw pump, comprising a platform (1), a detachable screw pump (2) fixedly mounted on the top of the platform (1), a connecting pipe (3) fixedly connected to the output end of the detachable screw pump (2), a top plate (4) provided on the top of the platform (1), a switching mechanism (5) provided on the top of the top plate (4), a lifting mechanism (6) provided at the bottom of the top plate (4), a support rod (7) fixedly connected to the bottom of the top plate (4), a fixing mechanism (8) provided on the top of the platform (1), and a cylinder (9) provided on the top of the platform (1), characterized in that: The switching mechanism (5) includes a first pipe (501), the left end of the first pipe (501) is connected to the right end of the connecting pipe (3), the top of the top plate (4) is fixedly connected to a bottom plate (502), the top of the bottom plate (502) is fixedly installed with a hydraulic rod (503), the outer surface of the hydraulic rod (503) is fitted with a guardrail (504), the top of the guardrail (504) is fixedly connected to a fixing plate (505), the output end of the hydraulic rod (503) is fixedly connected to a support rod (506), the bottom of the support rod (506) is fixedly connected to a vertical rod (507), the outer surface of the vertical rod (507) is fixedly fitted with a first sealing disc (508), the outer surface of the vertical rod (507) is fixedly fitted with a second sealing disc (509), the top of the top plate (4) is fixedly connected to a second pipe (510), and the bottom end of the vertical rod (507) is provided with a sealing plug (511). The bottom end of the vertical rod (507) slides through the outer surface of the first pipe (501), the bottom of the first sealing disc (508) is in contact with the outer surface of the first pipe (501), and the top of the second sealing disc (509) is in contact with the inner wall of the first pipe (501). The top end of the second pipe (510) is fixedly connected to the outer surface of the first pipe (501), and the outer surface of the sealing plug (511) is in contact with the inner wall of the second pipe (510). The lifting mechanism (6) includes a first fixed rod (601), the top end of which is fixedly connected to the bottom of the top plate (4). A second fixed rod (602) is provided at the bottom of the top plate (4), and a connecting plate (603) is fixedly connected to the bottom end of the second fixed rod (602). A top cover (604) is provided at the bottom of the connecting plate (603). A third connecting rod (605) is fixedly connected to the bottom of the frame rod (506), and a disc (606) is fixedly connected to the bottom end of the third connecting rod (605). A frame (607) is fixedly connected to the top of the top plate (4). The top of the disc (606) is fixedly connected to a pull rope (608), and the top of the frame (607) is movably connected to a rope disc (609) via a pivot. The bottom end of the first fixed rod (601) is slidably connected to a first limiting rod (610). A tension spring (611) is sleeved on the outer surface of the first limiting rod (610). The top end of the first limiting rod (610) is fixedly connected to a first limiting disc (612). The top end of the second fixed rod (602) is slidably connected to a second limiting rod (613), and the bottom end of the second limiting rod (613) is fixedly connected to a second limiting disc (614). The outer surface of the pull rope (608) is in contact with the outer surface of the rope disc (609). The top of the top plate (4) and the top of the first fixing rod (601) are both provided with sliding holes that are adapted to the pull rope (608). The end of the pull rope (608) away from the disc (606) is fixedly connected to the top of the first limiting disc (612). The bottom end of the first limiting rod (610) is fixedly connected to the top of the connecting plate (603). The first fixed rod (601) has a first limiting groove adapted to the first limiting plate (612) inside. The bottom end of the tension spring (611) is welded to the bottom surface of the inner wall of the first limiting groove, and the top end of the tension spring (611) is welded to the bottom of the first limiting plate (612). The top end of the second limiting rod (613) is fixedly connected to the bottom of the top plate (4). The second fixed rod (602) has a second limiting groove adapted to the second limiting plate (614) inside. The inner wall of the top cover (604) is in contact with the outer surface of the cylinder (9). The fixing mechanism (8) includes a base (801), the bottom of which is fixedly connected to the top of the platform (1). A fixing ring (802) is movably connected to the outer surface of the base (801) via a hinge. A pull plate (803) is provided on the outer surface of the base (801). A fixing block (804) is fixedly connected to the outer surface of the base (801). A buckle block (805) is fixedly connected to the bottom of the pull plate (803). A buckle ring (806) is fixedly connected to the outer surface of the fixing ring (802). A fourth connecting rod (807) is fixedly connected to the bottom of the pull plate (803). A spring (808) is sleeved on the outer surface of the fourth connecting rod (807). A third limiting plate (809) is fixedly connected to the bottom end of the fourth connecting rod (807). The inner wall of the fixing ring (802) is in contact with the outer surface of the cylinder (9). The bottom end of the fourth connecting rod (807) slides through the top of the fixing block (804). The fixing block (804) has a third limiting groove that is adapted to the third limiting plate (809). The top end of the spring (808) is welded to the top surface of the inner wall of the third limiting groove, and the bottom end of the spring (808) is welded to the top of the third limiting plate (809).

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