An automatic forming production device for elevator door panels

Abstract

The application relates to the field of elevator door plate forming production technology, in particular to an automatic elevator door plate forming production device, which comprises an operation table, a supporting plate is vertically and fixedly installed on the surface of the operation table, lifting arms are symmetrically installed on the surface of the supporting plate through lifting devices, a punch is fixedly installed between the two lifting arms, mounting blocks are fixedly and symmetrically installed on the inner wall of the punch, moving grooves are formed in the surfaces of the two mounting blocks, sliding blocks are slidably and fixedly installed in the two moving grooves through first elastic springs, supporting rods are fixedly installed on the surfaces of the two sliding blocks, and a top rod is fixedly installed between the two supporting rods. When the punch stamps the door plate, the top rod will first contact the door plate, then the top rod will push the waste out of the punch through the cooperation of the mounting blocks, the first elastic springs, the sliding blocks and the supporting rods, the waste is prevented from remaining in the punch, the precision of the next punching is ensured, and the work efficiency and the product yield are improved.

Description

Technical Field

[0001] This invention relates to the field of elevator door panel forming and production technology, and in particular to an automatic elevator door panel forming and production device. Background Technology

[0002] Elevator door panels are an important component of elevators and play a crucial role in the overall quality of the elevator. During the production process of elevator door panels, they need to be punched. Punching is done by using a special punch to apply a certain pressure to the plate, thereby creating through holes of various shapes in the plate.

[0003] Chinese Patent No. CN108176757A discloses a punching device for elevator door panel production, including a base, a top plate connected to the base via a column, a cylinder located at the center of the upper end of the top plate, and an upper die connected to the cylinder via a telescopic rod. The upper die includes a pad connected to the telescopic rod.

[0004] The above-mentioned device can effectively extend the service life of the punch head, but the following problems still exist. After the punch presses the door panel, because the punch is tubular, the punched waste is very likely to remain inside the punch. If this happens, it will seriously affect the punching accuracy, and the staff will need to stop the machine and clean it manually, which is very inconvenient. Summary of the Invention

[0005] The purpose of this invention is to address the following shortcomings in the prior art: after the punch presses the door panel, because the punch is tubular, the waste material from the punching is very likely to remain inside the punch. This situation will seriously affect the punching accuracy and requires the operator to stop the machine and clean it manually, which is very inconvenient. Therefore, this invention proposes an automatic forming production device for elevator door panels.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An automatic elevator door panel forming production device includes an operating table, a support plate is vertically fixedly installed on the surface of the operating table, lifting arms are symmetrically installed on the surface of the support plate through a lifting device, a tubular punch is fixedly installed between the two lifting arms, and a placement table is fixedly installed on the surface of the operating table.

[0008] The inner wall of the punch is symmetrically fixed with mounting blocks. The surfaces of the two mounting blocks are provided with moving grooves. Sliders are slidably installed in the two moving grooves through the first telescopic spring. Connecting rods are fixedly installed on the surfaces of the two sliders. A top rod is fixedly installed between the two connecting rods.

[0009] As a preferred embodiment, a suction cup is fixedly installed at the lower end of the push rod, and cylindrical holes are opened through both ends of the push rod. A through hole is opened on the surface of the suction cup, connecting the cylindrical holes. A piston is slidably installed in the cylindrical hole. A moving rod is fixedly installed at the upper end of the piston. A crossbar is fixedly installed on the surface of the moving rod. A strip hole is opened on the surface of the punch. One end of the crossbar passes through the strip hole. An L-shaped stop bar is fixedly installed on the surface of the operating table. The stop bar is located directly below the crossbar. A positioning ring is slidably sleeved on the moving rod. The positioning ring is fixedly installed at the upper end of the push rod. A circular groove is opened at the upper end of the moving rod. A moving column is slidably installed in the circular groove. A locking component for locking with the positioning ring is provided in the circular groove. A U-shaped support frame is fixedly installed on the surface of the support plate. A top column is fixedly installed on the lower surface of the support frame. The top column is located directly above the moving column.

[0010] As a preferred embodiment, the inner wall of the positioning ring is symmetrically provided with limiting grooves, and the surface of the moving rod is symmetrically provided with rectangular holes communicating with the circular grooves. The locking assembly includes a mounting plate fixedly installed in the circular groove, two first spring rods respectively fixedly installed on the two sides of the mounting plate, two limiting blocks respectively fixedly installed on one end of the two first spring rods, and two baffles respectively inclinedly fixedly installed on the two limiting blocks. One end of each of the two limiting blocks is inserted into the rectangular hole, and the longitudinal section of each of the two limiting blocks is a right trapezoid. The lower end of the top column is symmetrically fixedly provided with push rods, and the two push rods are respectively located directly above the two baffles.

[0011] As a preferred embodiment, a U-shaped support block is fixedly installed on the surface of the operating table. A groove is provided at the upper end of the support block, and movable blocks are symmetrically slidably installed in the groove. A second telescopic spring is fixedly installed on the surface of each of the two movable blocks, and one end of each of the two second telescopic springs is fixedly connected to the two movable blocks respectively. A guide plate is fixedly installed at an angle on the surface of each of the two movable blocks. A waste collection box is fixedly installed on the side of the support block, and a transmission assembly for driving the two guide plates to move relative to each other is provided on the two guide plates.

[0012] As a preferred embodiment, the transmission assembly includes two rectangular blocks respectively fixedly mounted on the sides of two guide plates, two support rods respectively rotatably mounted on the two rectangular blocks, a connecting block rotatably mounted on one end of the two support rods, and a second spring rod fixedly mounted on the connecting block. One end of the second spring rod is fixedly connected to the two lifting arms through a fixing block.

[0013] As a preferred embodiment, water storage boxes are symmetrically fixedly installed on the surface of the top rod, and water pipes are fixedly connected to the lower ends of the two water storage boxes. One end of each of the two water pipes is fixedly connected to a suction cup. Water outlet holes connected to the water pipes are symmetrically opened on the inner surface of the suction cup, and a squeezing component is provided on the suction cup for squeezing out the water in the water storage box.

[0014] As a preferred embodiment, the extrusion assembly includes two elastic air bladders and two support rods rotatably mounted on the two elastic air bladders respectively. One end of each of the two support rods is rotatably connected to the upper surface of the suction cup. The two elastic air bladders are respectively connected to two water storage boxes. Each of the two elastic air bladders has an air inlet 35 on its surface, and a one-way valve is fixedly installed in each of the two air inlets 35.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. When the punch presses the door panel, the push rod will first contact the door panel. When the punching ends and the punch moves upward, the push rod will move the punched waste away from the punch through the cooperation of the mounting block, the first telescopic spring, the slider and the support rod. This will prevent the waste from remaining in the punch, thus ensuring the accuracy of the next punching, improving work efficiency and yield.

[0017] 2. When the suction cup contacts the door panel, the piston will move upward through the moving rod under the action of the crossbar and the stop bar, so that the suction cup can stably hold the waste material. Then, through the cooperation of the locking component, the positioning ring, the top column and the moving column, the piston will move downward, thereby releasing the suction force of the suction cup on the waste material and preventing the waste material after stamping from being left on the operating table and affecting the placement of the next door panel.

[0018] 3. Through the cooperation of the support block, the second telescopic spring, the moving block, the guide plate and the transmission assembly, when the punch moves to the top, the suction force of the suction cup on the waste disappears, and the falling waste will slide along the guide plate into the waste box, thereby realizing the automatic collection of waste.

[0019] 4. When the suction cup adsorbs the door panel, the suction cup will deform. Then, through the cooperation of the squeezing component, water storage box, and water pipe, a small amount of water can be squeezed between the suction cup and the door panel. The surface tension of the water ensures the seal between the suction cup and the door panel, making the suction cup adsorb waste more stably. Attached Figure Description

[0020] Figure 1 This is a front three-dimensional cross-sectional view of an automatic elevator door panel forming production device proposed in this invention.

[0021] Figure 2 This is a partial three-dimensional structural diagram of an automatic elevator door panel forming production device proposed in this invention;

[0022] Figure 3 This is a schematic diagram of a three-dimensional partial cross-sectional structure of the punch in an automatic elevator door panel forming production device proposed in this invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the guide plate in an automatic elevator door panel forming production device proposed in this invention;

[0024] Figure 5 for Figure 3 Enlarged structural diagram at point A in the middle;

[0025] Figure 6 for Figure 3 Enlarged structural diagram at point B;

[0026] Figure 7 for Figure 3 Enlarged structural diagram at point C;

[0027] Figure 8 for Figure 4 Enlarged structural diagram at point D.

[0028] In the diagram: 1. Operating platform, 2. Support plate, 3. Lifting arm, 4. Punch, 5. Mounting block, 6. First telescopic spring, 7. Slider, 8. Connecting rod, 9. Top rod, 10. Suction cup, 11. Piston, 12. Moving rod, 13. Crossbar, 14. Placement platform, 15. Stop bar, 16. Positioning ring, 17. Support frame, 18. Top column, 19. Mounting plate, 20. First spring rod, 21. Limiting block, 22. Baffle, 23. Support block, 24. Moving block, 25. Second telescopic spring, 26. Guide plate, 27. Collection box, 28. Support rod, 29. Connecting block, 30. Second spring rod, 31. Water storage box, 32. Elastic airbag, 33. Support rod, 34. Moving column, 35. Air inlet, 36. Push rod, 37. Water pipe. Detailed Implementation

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

[0030] Reference Figures 1-8An automatic forming production device for elevator door panels includes an operating table 1. A support plate 2 is vertically fixedly installed on the surface of the operating table 1. Lifting arms 3 are symmetrically installed on the surface of the support plate 2 via a lifting device (the lifting device is existing technology and will not be described in detail here). A tubular punch 4 is fixedly installed between the two lifting arms 3. A placement table 14 is fixedly installed on the surface of the operating table 1. When punching the door panel, the door panel is first placed on the placement table 14. Then, the lifting device drives the two lifting arms 3 to move vertically downward, and then drives the punch 4 to move towards the door panel, thereby punching the door panel through the punch 4.

[0031] The inner wall of the punch 4 is symmetrically fixed with mounting blocks 5. The surfaces of the two mounting blocks 5 are provided with moving grooves. The sliding blocks 7 are slidably installed in the two moving grooves through the first telescopic spring 6. The surfaces of the two sliding blocks 7 are fixedly installed with connecting rods 8. The top rod 9 is fixedly installed between the two connecting rods 8.

[0032] Before the punch 4 contacts the door panel, the push rod 9 will first contact the door panel. When the punch 4 continues to press downward, the push rod 9 will drive the two sliders 7 to move in the two moving slots through the two connecting rods 8 respectively, and the two first telescopic springs 6 will be compressed. After the punching is completed, the punch 4 moves upward. At this time, under the action of the elastic force of the first telescopic spring 6, the slider 7 moves vertically downward in the moving slot. Thus, the push rod 9 is still in contact with the waste material after punching. The push rod 9 can squeeze out the waste material remaining in the punch 4, thereby avoiding the waste material remaining in the punch 4, thus ensuring the accuracy of the next punching, improving work efficiency and yield.

[0033] A suction cup 10 is fixedly installed at the lower end of the push rod 9. Cylindrical holes are opened through both ends of the push rod 9. A through hole is opened on the surface of the suction cup 10, which is connected to the cylindrical hole. A piston 11 is slidably installed in the cylindrical hole. A moving rod 12 is fixedly installed at the upper end of the piston 11. A crossbar 13 is fixedly installed on the surface of the moving rod 12. A strip hole is opened on the surface of the punch 4. One end of the crossbar 13 passes through the strip hole. An L-shaped stop bar 15 is fixedly installed on the surface of the operating table 1. The stop bar 15 is located directly below the crossbar 13. A positioning ring 16 is slidably sleeved on the moving rod 12. The positioning ring 16 is fixedly installed at the upper end of the push rod 9. A circular groove is opened at the upper end of the moving rod 12. A moving column 34 is slidably installed in the circular groove. A locking component for locking with the positioning ring 16 is provided in the circular groove. A U-shaped support frame 17 is fixedly installed on the surface of the support plate 2. A top column 18 is fixedly installed on the lower surface of the support frame 17. The top column 18 is located directly above the moving column 34.

[0034] When the punch 4 moves the push rod 9 vertically downwards, it simultaneously moves the suction cup 10 towards the door panel. Just as the suction cup 10 contacts the door panel, the crossbar 13 also contacts the stop bar 15. When the suction cup 10 deforms, the crossbar 13 and the stop bar 15 restrict the moving rod 12 from moving further downwards, causing the moving rod 12 to slide relative to the push rod 9. The moving rod 12 then moves the piston 11 upwards within the cylindrical hole. After the suction cup 10 contacts the door panel, the cylindrical hole below the piston 11... The sealed space is formed. As the piston 11 moves, the space increases and the internal pressure decreases. Under the action of the pressure difference, the suction cup 10 can be stably attracted to the door panel. At this time, the moving rod 12 is also locked to the positioning ring 16 through the locking component. After the punch 4 finishes punching the door panel, the suction cup 10 picks up the waste material. When the punch 4 moves upward, it will drive the suction cup 10 to move vertically upward. The suction cup 10 then drives the waste material to move upward, thereby preventing the waste material after punching from being left on the operating table 1 and affecting the placement of the next door panel.

[0035] The inner wall of the positioning ring 16 is symmetrically provided with limiting grooves, and the surface of the moving rod 12 is symmetrically provided with rectangular holes that communicate with the circular grooves. The locking assembly includes a mounting plate 19 fixedly installed in the circular groove, two first spring rods 20 respectively fixedly installed on the two sides of the mounting plate 19, two limiting blocks 21 respectively fixedly installed on one end of the two first spring rods 20, and two baffles 22 respectively inclinedly fixedly installed on the two limiting blocks 21. One end of each of the two limiting blocks 21 is inserted into the rectangular hole. The longitudinal section of each of the two limiting blocks 21 is a right trapezoid. The lower end of the moving column 34 is symmetrically fixedly provided with push rods 36, and the two push rods 36 are located directly above the two baffles 22 respectively.

[0036] Under the action of the crossbar 13 and the stop bar 15, when the moving rod 12 and the positioning ring 16 slide relative to each other, under the action of the elastic force of the first spring rod 20, the two limit blocks 21 will be inserted into the two limit slots respectively, thereby locking the moving rod 12 and the positioning ring 16 together. When the lifting arm 3 drives the punch 4 to move to the uppermost position, the top column 18 fixedly installed on the support frame 17 will contact the moving column 34 in the circular groove opened at one end of the moving rod 12, and then drive the moving column 34 to move relative to the moving rod 12. Through the moving column 34, the two push rods 36 will contact the two baffles 22 respectively. Since the two baffles 22 are inclined The obliquely fixed installation on the two limiting blocks 21, under the action of the baffle 22, will generate a force on the two limiting blocks 21 in the direction of the first spring rod 20, thereby driving the two limiting blocks 21 to move towards the first spring rod 20. The two limiting blocks 21 move out of the two limiting grooves respectively, thereby locking the locking action of the locking assembly between the moving rod 12 and the positioning ring 16. Then the moving column 34 drives the moving rod 12 to slide relative to the top rod 9. The piston 11 moves downward in the cylindrical hole, thereby reducing the sealing space between the suction cup 10 and the cylindrical hole below the piston 11, increasing the pressure. Under the action of the pressure difference, the waste separates from the suction cup 10.

[0037] A U-shaped support block 23 is fixedly installed on the surface of the operating table 1. A groove is provided at the upper end of the support block 23. Moving blocks 24 are symmetrically slidably installed in the groove. A second telescopic spring 25 is fixedly installed on the surface of each of the two moving blocks 24. One end of each of the two second telescopic springs 25 is fixedly connected to the two moving blocks 24 respectively. Guide plates 26 are fixedly installed at an angle on the surface of each of the two moving blocks 24. A waste collection box 27 is fixedly installed on the side of the support block 23. A transmission assembly for driving the two guide plates 26 to move relative to each other is provided on the two guide plates 26. The transmission assembly includes two rectangular blocks fixedly installed on the side of the two guide plates 26 respectively, two support rods 28 rotatably installed on the two rectangular blocks respectively, a connecting block 29 rotatably installed on one end of the two support rods 28, and a second spring rod 30 fixedly installed on the connecting block 29. One end of the second spring rod 30 is fixedly connected to the two lifting arms 3 through a fixing block.

[0038] When the lifting arm 3 moves the punch 4 downward, it also moves the second spring rod 30 vertically downward. At this time, the elastic force of the second spring rod 30 is greater than that of the second telescopic spring 25. Consequently, the second spring rod 30, through the two support rods 28, moves the two guide plates 26 away from each other. The two guide plates 26 then move the two moving blocks 24 away from each other within the chute. The second telescopic spring 25 is compressed until the two moving blocks 24 move to the two ends of the chute. Only then does the second spring rod 30 begin to compress. When the two guide plates 26 move away from each other, the punch 4 passes between the two guide plates 26. When the lifting arm 3 moves the punch 4 upward, the second spring rod 30... The spring rod 30 first returns to its original shape under the action of elastic force. When the punch 4 moves above the two guide plates 26, the second spring rod 30 pulls the two guide plates 26 closer together through the two support rods 28. The two moving blocks 24 in the chute also move closer together. When the punch 4 moves to the top, the two guide plates 26 also just come into contact with each other. At this time, the suction force of the suction cup 10 on the waste disappears, and the waste will fall onto the guide plate 26. Since the guide plate 26 is fixedly installed on the moving block 24 at an angle, the waste will fall into the collection box 27 along the guide plate 26, thereby realizing the automatic collection of waste without manual operation and preventing the waste from falling back onto the placement table 14.

[0039] Water storage boxes 31 are symmetrically fixedly installed on the surface of the top rod 9. Water pipes 37 are fixedly connected to the lower ends of the two water storage boxes 31. One end of each water pipe 37 is fixedly connected to a suction cup 10. Water outlet holes connected to the water pipes 37 are symmetrically opened on the inner surface of the suction cup 10. A squeezing component for squeezing water out of the water storage box 31 is provided on the suction cup 10. The squeezing component includes two elastic air bladders 32 and two support rods 33 that are rotatably installed on the two elastic air bladders 32 respectively. One end of each support rod 33 is rotatably connected to the upper surface of the suction cup 10. The two elastic air bladders 32 are respectively connected to the two water storage boxes 31. Air inlets 35 are opened on the surface of each of the two elastic air bladders 32. One-way valves are fixedly installed in each of the two air inlets 35.

[0040] When the suction cup 10 contacts the door panel, it deforms. During this deformation, the suction cup 10 compresses the elastic airbag 32 through the two support rods 33, thereby squeezing the gas inside the elastic airbag 32 into the water storage box 31. As the gas in the water storage box 31 increases, the water inside the water storage box 31 is squeezed into the space between the suction cup 10 and the door panel through the water pipe 37. When the suction cup 10 adsorbs waste, it effectively ensures the seal between the suction cup 10 and the door panel, making the adsorption of waste by the suction cup 10 more stable. When the suction cup 10 detaches from the waste, it returns to its original shape, and the elastic airbag 32 returns to its original shape under its own elasticity. At this time, outside air enters the elastic airbag 32 through the air inlet 35 and the one-way valve. Under the action of the one-way valve, the gas can enter the elastic airbag 32 from the outside through the air inlet 35 and cannot be discharged from the air inlet 35.

[0041] In this invention, before the punch 4 presses the door panel, the push rod 9 first contacts the door panel. When the punch 4 continues to press downward, the push rod 9 drives the two sliders 7 to move in the two moving slots through the two connecting rods 8 respectively. The first telescopic spring 6 is compressed. After the pressing is completed, the punch 4 moves upward. At this time, under the action of the elastic force of the first telescopic spring 6, the sliders 7 move vertically downward in the moving slots. Thus, the push rod 9 is still in contact with the waste material after pressing. The push rod 9 can squeeze out the waste material remaining in the punch 4, thereby avoiding the waste material remaining in the punch 4, thus ensuring the accuracy of the next punching, improving work efficiency and yield.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic elevator door panel forming production device, comprising an operating table (1), characterized in that, The operating table (1) is vertically fixedly mounted with a support plate (2), and the support plate (2) is symmetrically mounted with lifting arms (3) via a lifting device. A tubular punch (4) is fixedly mounted between the two lifting arms (3), and a placement table (14) is fixedly mounted on the operating table (1). The inner wall of the punch (4) is symmetrically fixed with mounting blocks (5). The surfaces of the two mounting blocks (5) are provided with moving grooves. The two moving grooves are slidably installed with sliders (7) through the first telescopic spring (6). The surfaces of the two sliders (7) are fixedly installed with connecting rods (8). The top rod (9) is fixedly installed between the two connecting rods (8). A suction cup (10) is fixedly installed at the lower end of the push rod (9). Cylindrical holes are opened through both ends of the push rod (9). A through hole communicating with the cylindrical hole is opened on the surface of the suction cup (10). A piston (11) is slidably installed inside the cylindrical hole. A moving rod (12) is fixedly installed at the upper end of the piston (11). A crossbar (13) is fixedly installed on the surface of the moving rod (12). A strip-shaped hole is opened on the surface of the punch (4). One end of the crossbar (13) passes through the strip-shaped hole. An L-shaped stop bar (15) is fixedly installed on the surface of the operating table (1). 15) Located directly below the crossbar (13), the moving rod (12) is slidably fitted with a positioning ring (16), the positioning ring (16) is fixedly installed on the upper end of the top rod (9), the upper end of the moving rod (12) is provided with a circular groove, the moving column (34) is slidably installed in the circular groove, the circular groove is provided with a locking component for locking with the positioning ring (16), the surface of the support plate (2) is fixedly installed with a U-shaped support frame (17), the lower surface of the support frame (17) is fixedly installed with a top column (18), the top column (18) is located directly above the moving column (34); The positioning ring (16) has symmetrically opened limit grooves on its inner wall. The moving rod (12) has symmetrically opened rectangular holes that communicate with the circular groove. The locking assembly includes a mounting plate (19) fixedly installed in the circular groove, two first spring rods (20) fixedly installed on both sides of the mounting plate (19), two limit blocks (21) fixedly installed at one end of the two first spring rods (20), and two baffles (22) fixedly installed on the two limit blocks (21) at an incline. One end of the two limit blocks (21) is inserted into the rectangular hole. The longitudinal section of the two limit blocks (21) is a right trapezoid. The lower end of the moving column (34) is symmetrically fixedly installed with push rods (36). The two push rods (36) are located directly above the two baffles (22).

2. The automatic elevator door panel forming production device according to claim 1, characterized in that, A U-shaped support block (23) is fixedly installed on the surface of the operating table (1). A sliding groove is provided at the upper end of the support block (23). Moving blocks (24) are symmetrically slidably installed in the sliding groove. A second telescopic spring (25) is fixedly installed on the surface of each of the two moving blocks (24). One end of each of the two second telescopic springs (25) is fixedly connected to the two moving blocks (24). Guide plates (26) are fixedly installed on the surface of each of the two moving blocks (24) at an angle. A waste collection box (27) is fixedly installed on the side of the support block (23). A transmission component for driving the two guide plates (26) to move relative to each other is provided on the two guide plates (26).

3. The automatic elevator door panel forming production device according to claim 2, characterized in that, The transmission assembly includes two rectangular blocks fixedly mounted on the sides of two guide plates (26), two support rods (28) rotatably mounted on the two rectangular blocks, a connecting block (29) rotatably mounted on one end of the two support rods (28), and a second spring rod (30) fixedly mounted on the connecting block (29). One end of the second spring rod (30) is fixedly connected to the two lifting arms (3) through a fixing block.

4. The automatic elevator door panel forming production device according to claim 1, characterized in that, Water storage boxes (31) are symmetrically fixedly installed on the surface of the top rod (9). Water pipes (37) are fixedly connected to the lower ends of the two water storage boxes (31). One end of each of the two water pipes (37) is fixedly connected to the suction cup (10). Water outlet holes connected to the water pipes (37) are symmetrically opened on the inner surface of the suction cup (10). The suction cup (10) is provided with a squeezing component for squeezing out the water in the water storage box (31).

5. The automatic elevator door panel forming production device according to claim 4, characterized in that, The extrusion assembly includes two elastic airbags (32) and two support rods (33) rotatably mounted on the two elastic airbags (32). One end of each of the two support rods (33) is rotatably connected to the upper surface of the suction cup (10). The two elastic airbags (32) are respectively connected to two water storage boxes (31). Each of the two elastic airbags (32) has an air inlet (35) on its surface. Each of the two air inlets (35) has a one-way valve fixedly installed inside it.

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