Distillation column for recovering organic solvents in waste panels and method for ascending with the load thereof

Abstract

The application discloses a distillation column for recycling organic solvents in waste panels, which comprises a distillation column body, an electric elevator and an anti-falling assembly, wherein the electric elevator is vertically installed on the outer surface of the distillation column body; the anti-falling assembly comprises a left telescopic cylinder group, a right telescopic cylinder group and an elastic rubber strip, the left telescopic cylinder group and the right telescopic cylinder group are respectively located on the left side and the right side of the electric elevator, the left telescopic cylinder group comprises a plurality of left telescopic cylinder monomers, the right telescopic cylinder group comprises a plurality of right telescopic cylinder monomers, the cylinder body and the telescopic shaft of all the left telescopic cylinder monomers are in arc shape, the cylinder body and the telescopic shaft of all the right telescopic cylinder monomers are in arc shape, all the left telescopic cylinder monomers are fixedly connected to the outer surface of the distillation column body along the vertical direction, and all the right telescopic cylinder monomers are fixedly connected to the outer surface of the distillation column body along the vertical direction. The application reduces the difficulty of climbing the distillation column and strengthens the protection of maintenance personnel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of precious metal recovery, in particular to a distillation column for recovering organic solvents in waste panels and a carrying and lifting method thereof. BACKGROUND

[0002] Liquid crystal displays (also called LCD displays) have been popular for a long time, although better displays such as OLEDs have now appeared, but now it is the peak period of recycling of liquid crystal displays. The liquid crystal content of liquid crystal displays accounts for only about 0.1-0.2% of the total weight of the panel, but the panel glass cannot be recycled due to regulations. The disposal of waste panels by incineration or burial will cause environmental pollution. The European Union published the Waste Electrical and Electronic Equipment Directive in 2003, which requires manufacturers and sellers to be responsible for the recycling of products. Therefore, the recycling of liquid crystals in liquid crystal displays has combined the dual tasks of environmental protection and economy.

[0003] There are many known liquid crystal processing methods, such as TW 2004-04884, which first removes the frame glue, then dissolves the liquid crystal with a solvent or removes the liquid crystal with a gas blowing method or a centrifuge, and then removes the impurities in the liquid crystal with a reduced pressure distillation method or removes the ions with an adsorbent to recover the liquid crystal. Distillation is the most common method and is currently the most widely used and lower cost method, in which the distillation column is the main equipment. The size of the distillation column is determined according to the scale of the liquid crystal recovery, and currently there are more large-scale distillation columns, and the daily maintenance of large-scale distillation columns is particularly important.

[0004] The outer surface of the distillation column is provided with a climbing frame. Since the maintenance and repair of the distillation column is a high-altitude operation, the climbing frame is wrapped with a protective cage to reduce the possibility of accidental falling of personnel. The current protective cage structure is simple and is welded with steel bars. The entire protective cage has no gap and only the upper end and the lower end are provided with openings. If the repair personnel carry a long rod-shaped tool or other articles, the presence of the protective cage greatly increases the difficulty of carrying and climbing, which is very disadvantageous to the repair work and greatly increases the repair work. SUMMARY

[0005] In view of the defects in the prior art, the difficulty of climbing the distillation column is reduced and the protection of the repair personnel is strengthened. The present application provides a distillation column for recovering organic solvents in waste panels, which comprises a distillation column body; further comprising an electric elevator and an anti-falling assembly, the electric elevator is vertically installed on the outer surface of the distillation column body;

[0006] The anti-falling assembly comprises a left telescopic cylinder group, a right telescopic cylinder group and two elastic rubber strips, the left telescopic cylinder group and the right telescopic cylinder group are respectively located at the left side and the right side of the electric elevator, and the left telescopic cylinder group comprises a plurality of left telescopic cylinder units and the right telescopic cylinder group comprises a plurality of right telescopic cylinder units; the cylinder body and the telescopic shaft of all the left telescopic cylinder units are arc-shaped, and the cylinder body and the telescopic shaft of all the right telescopic cylinder units are arc-shaped;

[0007] All the left telescopic cylinder units are fixedly connected to the outer surface of the distillation tower body along the vertical direction, and all the right telescopic cylinder units are fixedly connected to the outer surface of the distillation tower body along the vertical direction, all the left telescopic cylinder units correspond to all the right telescopic cylinder units, and the bending directions of any one right telescopic cylinder unit and the corresponding left telescopic cylinder unit are opposite;

[0008] The two elastic rubber strips are fixedly connected to the ends of the telescopic shafts of all the left telescopic cylinder units and the ends of the telescopic shafts of all the right telescopic cylinder units respectively, and are extended by the left telescopic cylinder group and the right telescopic cylinder group, so that the two elastic rubber strips are vertically distributed and in contact.

[0009] The beneficial effects of the device are as follows: after the left telescopic cylinder group and the right telescopic cylinder group are extended, the anti-falling cage is formed, that is, the anti-falling cage is formed by all the left telescopic cylinder units and all the right telescopic cylinder units, and the two elastic rubber strips fill the gap between the left telescopic cylinder units and the right telescopic cylinder units in the vertical direction. If a longer object cannot pass through the anti-falling cage, the gap for the longer object to pass through is provided by retracting the left telescopic cylinder group and the right telescopic cylinder group, thereby reducing the difficulty of climbing the distillation tower and enhancing the protection of the maintenance personnel.

[0010] Preferably, the distance between any two adjacent left telescopic cylinder units in the left telescopic cylinder group is not greater than 0.5 meters.

[0011] Preferably, the distance between any two adjacent right telescopic cylinder units in the right telescopic cylinder group is not greater than 0.5 meters. The gap width of the left telescopic cylinder units and the right telescopic cylinder units in the vertical direction is kept at 0.5 meters, which is moderate in size and is also conducive to maintaining the structural strength of the overall anti-falling assembly.

[0012] Preferably, the left side of the left telescopic cylinder group is provided with a left anti-falling net, and the left anti-falling net is fixedly connected to the cylinder seat of each left telescopic cylinder unit. The left anti-falling net blocks half of the longitudinal gap of the left telescopic cylinder group, greatly reduces the possibility of falling, and improves the safety level.

[0013] Preferably, the right side of the right telescopic cylinder group is provided with a right anti-falling net, and the right anti-falling net is fixedly connected to the cylinder seat of each right telescopic cylinder unit. The right anti-falling net has the same effect as the left anti-falling net.

[0014] Preferably, the electric elevator comprises electric guide rails, a footboard and a handrail; the electric guide rails are provided with two parallel and vertical electric guide rails fixed to the outer surface of the distillation tower body, the two ends of the footboard are respectively slidably connected to the two electric guide rails, and the handrail is fixed above the electric guide rails and slidably connected with the two electric guide rails, and the footboard drives the handrail to ascend and descend along the electric guide rails. The maintenance personnel stand on the footboard with their feet and hold the handrail, and the footboard drives the handrail to ascend and descend synchronously under the drive of the electric guide rails, replacing manual climbing. It is particularly suitable for large distillation towers, and can further improve the maintenance difficulty and efficiency.

[0015] Preferably, the handrail comprises a left handrail slidably connected to one of the electric guide rails and a right handrail slidably connected to the other electric guide rail; the left side and the right side of the two electric guide rails are respectively provided with vertical sliding grooves in the shape of T; the two ends of the right handrail and the two ends of the left handrail are respectively provided with two T-shaped heads; the two T-shaped heads of the left handrail are slidably connected to the vertical sliding groove of one of the electric guide rails, and the two T-shaped heads of the right handrail are slidably connected to the vertical sliding groove of the other electric guide rail; and the right handrail and the left handrail are fixedly connected with the footboard through fixing rods. The left handrail and the right handrail are slidably connected through the T-shaped head and the vertical sliding groove, which avoids the left handrail and the right handrail from falling off the distillation tower body, and plays a role of limiting and increasing the safety factor.

[0016] Preferably, the side wall of one of the two electric guide rails is provided with a plurality of distance sensors, and all the distance sensors are vertically distributed on the side wall of the corresponding electric guide rail, and the handrail passes through the sensing end of the distance sensor through the lifting of the footboard.

[0017] The application also provides a carrying and lifting method for a distillation tower, which is applied to the distillation tower for recycling organic solvents in waste panels. n The left telescopic cylinder monomers arranged from bottom to top are left telescopic cylinder monomers B1-B n The right telescopic cylinder monomers arranged from bottom to top are right telescopic cylinder monomers C1-C n , comprising the following steps:

[0018] S1, all the left telescopic cylinder monomers and all the right telescopic cylinder monomers are extended, so that the two elastic rubber strips are in contact, and the electric elevator is located at the lowest point of the electric guide rail;

[0019] S2, the footboard drives the handrail to ascend simultaneously, and when the handrail passes through the distance sensor A1, the left telescopic cylinder monomer B1 and the right telescopic cylinder monomer C1 at the lowest point are retracted simultaneously, so that the lower ends of the two elastic rubber strips are separated and form a gap.

[0020] S3, the pedal drives the handrail frame to continue to rise at the same time, when the handrail frame passes through the second distance sensor A2, the left telescopic cylinder B2 and the right telescopic cylinder C2 are retracted at the same time, thereby the elastic rubber strips corresponding to the left telescopic cylinder B2 and the right telescopic cylinder C2 are separated and form a gap, at the same time, the left telescopic cylinder B1 and the right telescopic cylinder C1 are extended at the same time, thereby the elastic rubber strips corresponding to the left telescopic cylinder B1 and the right telescopic cylinder C1 are contacted;

[0021] S4, repeat S3 until the elastic rubber strips corresponding to the left telescopic cylinder B n and the right telescopic cylinder C n are separated and form a gap, at the same time, the left telescopic cylinder B n-1 and the right telescopic cylinder C n-1 are extended at the same time, thereby the elastic rubber strips corresponding to the left telescopic cylinder B n-1 and the right telescopic cylinder C n-1 are contacted.

[0022] The beneficial effects of the method are that the safety of the maintenance personnel must be ensured during the process of the rod-shaped article passing through the anti-falling assembly, all left telescopic cylinder groups and right telescopic cylinder groups cannot be retracted at the same time, but the specific position of the gap is adaptively changed according to the position of the rod-shaped article rising. The change of the position of the gap is realized by the above method, which does not affect the carrying of the rod-shaped article and can ensure the safety of the maintenance personnel. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0024] Figure 1 It is a structural schematic view of the embodiment;

[0025] Figure 2 It is an enlarged view of A in Figure 1

[0026] Figure 3 It is a top view of Figure 1

[0027] Figure 4 It is a partial enlarged view of Figure 3

[0028] Figure 5 It is an enlarged view of B in Figure 4 ​​​​

[0029] In the drawings, the distillation column body 1, the electric guide rail 2, the pedal 3, the handrail 4, the left handrail 5, the right handrail 6, the vertical sliding groove 7, the T-shaped head 8, the fixed rod 9, the left telescopic cylinder unit 10, the right telescopic cylinder unit 11, the cylinder body 12, the telescopic shaft 13, the elastic rubber strip 14, the left anti-falling net 15, the right anti-falling net 16, the steel bar 17, and the distance sensor 18. DETAILED DESCRIPTION

[0030] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0031] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by the skilled person in the field to which the present application belongs.

[0032] As Figure 1 shown, the present embodiment provides a distillation column for recycling organic solvents in waste panels, which comprises a distillation column body 1, an electric elevator and an anti-falling assembly. The electric elevator is vertically installed on the outer surface of the distillation column body 1, and the specific structure of the electric elevator is as follows:

[0033] As Figures 2 to 5As shown, the electric lift includes electric guide rails 2, a footboard 3 and a handrail 4; the electric guide rails 2 are provided in two, and the two electric guide rails 2 are welded and fixed vertically on the outer surface of the distillation column body 1 through steel bars 17, and the two electric guide rails 2 are parallel. The two ends of the footboard 3 are respectively slidably connected to the two electric guide rails 2, and the handrail 4 is fixed above the electric guide rails 2 and slidably connected with the two electric guide rails 2, and the handrail 4 is lifted synchronously by the footboard 3 along the electric guide rails 2. The maintenance personnel stand on the footboard 3 with both feet, hold the handrail 4, and the footboard 3 drives the handrail 4 to rise and fall synchronously under the drive of the electric guide rails 2, instead of manual climbing. It is particularly suitable for large distillation columns, and can further improve the maintenance difficulty and efficiency. Further, the handrail 4 includes a left handrail 5 slidably connected to one of the electric guide rails 2 and a right handrail 6 slidably connected to the other electric guide rail 2; the left side and the right side of the two electric guide rails 2 are respectively provided with vertical sliding grooves 7 with a T-shaped cross section, and the two ends of the right handrail 6 and the two ends of the left handrail 5 are respectively provided with two T-shaped heads 8, the two T-shaped heads 8 of the left handrail 5 are slidably connected in the vertical sliding groove 7 of one of the electric guide rails 2, and the two T-shaped heads 8 of the right handrail 6 are slidably connected in the vertical sliding groove 7 of the other electric guide rail 2; the right handrail 6 and the left handrail 5 are respectively fixedly connected with the footboard 3 through a fixed rod 9. The left handrail 5 and the right handrail 6 are slidably connected through the T-shaped head 8 and the vertical sliding groove 7, which avoids the left handrail 5 and the right handrail 6 from falling off the distillation column body 1, and plays a role of limiting and increasing the safety factor.

[0034] The specific structure of the anti-falling assembly is as follows:

[0035] As Figure 4As shown, the anti-falling assembly comprises a left telescopic cylinder group, a right telescopic cylinder group and an elastic rubber strip 14, the left telescopic cylinder group and the right telescopic cylinder group are respectively located at the left side and the right side of the electric elevator, and the left telescopic cylinder group comprises a plurality of left telescopic cylinder units 10 and the right telescopic cylinder group comprises a plurality of right telescopic cylinder units 11; the cylinder body 12 and the telescopic shaft 13 of all left telescopic cylinder units 10 are arc-shaped, and the cylinder body 12 and the telescopic shaft 13 of all right telescopic cylinder units 11 are arc-shaped. All left telescopic cylinder units 10 are fixedly connected to the outer surface of the distillation tower body 1 along the vertical direction, and all right telescopic cylinder units 11 are fixedly connected to the outer surface of the distillation tower body 1 along the vertical direction, all left telescopic cylinder units 10 correspond to all right telescopic cylinder units 11 one by one, and the bending direction of any one right telescopic cylinder unit 11 and the bending direction of the corresponding left telescopic cylinder unit 10 are opposite. Further, the distance between any two adjacent left telescopic cylinder units 10 in the left telescopic cylinder group is not greater than 0.5 meters. The distance between any two adjacent right telescopic cylinder units 11 in the right telescopic cylinder group is not greater than 0.5 meters. The gap width of the left telescopic cylinder unit 10 and the right telescopic cylinder unit 11 in the vertical direction is kept at 0.5 meters, which is moderate in size, and is also conducive to maintaining the structural strength of the whole anti-falling assembly. In addition, the left side of the left telescopic cylinder group is provided with a left anti-falling net 15, which is fixedly connected with the cylinder seat of each left telescopic cylinder unit 10. The left anti-falling net 15 blocks half of the longitudinal gap of the left telescopic cylinder group, greatly reduces the possibility of falling, and improves the safety level. The right side of the right telescopic cylinder group is provided with a right anti-falling net 16, which is fixedly connected with the cylinder seat of each right telescopic cylinder unit 11. The right anti-falling net 16 has the same effect as the left anti-falling net 15.

[0036] The elastic rubber strip 14 is provided with two strips, one of which is fixedly connected to the end of the telescopic shaft 13 of all left telescopic cylinder units 10, and the other is fixedly connected to the end of the telescopic shaft 13 of all right telescopic cylinder units 11, which are extended by the left telescopic cylinder group and the right telescopic cylinder group, so that the two elastic rubber strips 14 are vertically distributed and in contact. After the left telescopic cylinder group and the right telescopic cylinder group are extended, an anti-falling cage is formed, that is, the anti-falling cage is formed by all left telescopic cylinder units 10 and all right telescopic cylinder units 11, and the two elastic rubber strips 14 fill the gap of the left telescopic cylinder unit 10 and the right telescopic cylinder unit 11 in the vertical direction. If a longer object cannot pass through the anti-falling cage, the left telescopic cylinder group and the right telescopic cylinder group are retracted to provide a gap for the longer object to pass through, thereby reducing the difficulty of climbing the distillation tower and also strengthening the protection of the maintenance personnel.

[0037] The embodiment also provides a carrying and lifting method of the distillation column. The side wall of one of the electric rails 2 of the distillation column for recycling organic solvents of waste panels is provided with a plurality of distance sensors 18. All the distance sensors 18 are vertically distributed on the side wall of the corresponding electric rail 2, and the handrail frame 4 is lifted by the pedal 3 to pass through the sensing end of the distance sensor 18. The distance between every two adjacent distance sensors 18 is 0.5 m, and the distance between the lowest distance sensor 18 and the lowest left telescopic cylinder unit 10 or the lowest right telescopic cylinder unit 11 is 1 m, that is, the total number of the left telescopic cylinder units 10 or the right telescopic cylinder units 11 is less than the total number of the distance sensors 18 by one. The carrying and lifting method of the distillation column comprises the following steps.

[0038] In order to avoid confusion of the reference signs, the following reference signs are not marked. The distance sensors arranged from bottom to top are distance sensors A1-An, the left telescopic cylinder units arranged from bottom to top are left telescopic cylinder units B1-Bn, and the right telescopic cylinder units arranged from bottom to top are right telescopic cylinder units C1-Cn, and the method comprises the following steps.

[0039] S1, all the left telescopic cylinder units and all the right telescopic cylinder units are extended to make the two elastic rubber strips contact, and the electric lift is located at the lowest point of the electric rail;

[0040] S2, the pedal drives the handrail frame to simultaneously rise, when the handrail frame passes through the distance sensor A1, the lowest left telescopic cylinder unit B1 and the right telescopic cylinder unit C1 are simultaneously retracted, so that the lower ends of the two elastic rubber strips are separated and form a gap;

[0041] S3, the pedal drives the handrail frame to continue to simultaneously rise, when the handrail frame passes through the second distance sensor A2, the left telescopic cylinder unit B2 and the right telescopic cylinder unit C2 are simultaneously retracted, so that the elastic rubber strips corresponding to the left telescopic cylinder unit B2 and the right telescopic cylinder unit C2 are separated and form a gap, and the left telescopic cylinder unit B1 and the right telescopic cylinder unit C1 are simultaneously extended, so that the elastic rubber strips corresponding to the left telescopic cylinder unit B1 and the right telescopic cylinder unit C1 are in contact;

[0042] S4, S3 is repeated until the elastic rubber strips corresponding to the left telescopic cylinder unit B n and the right telescopic cylinder unit B n are separated and form a gap, and the left telescopic cylinder unit B n-1 and the right telescopic cylinder unit C n-1 are simultaneously extended, so that the elastic rubber strips corresponding to the left telescopic cylinder unit B n-1 and the right telescopic cylinder unit C n-1 are in contact.

[0043] The above steps are automatically operated under the control of the electric control box, the electric control box is electrically connected with all left telescopic cylinder units, all right telescopic cylinder units and the electric guide rail respectively, the electric control box adopts a PLC electric control board, and the electric control board itself belongs to the prior art, and thus the detailed internal structure will not be described herein.

[0044] The method has the beneficial effect that the personal safety of the maintenance personnel must be ensured during the process that the rod-shaped article passes through the anti-falling assembly, all left telescopic cylinder groups and right telescopic cylinder groups cannot be retracted at the same time, and the specific position of the gap is adaptively changed according to the position of the rod-shaped article rising. The change of the position of the gap is realized by the above method, which does not affect the carrying of the rod-shaped article and ensures the personal safety of the maintenance personnel.

[0045] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application.

Claims

1. A distillation column for recovering organic solvents from waste panels; comprising a distillation column body; characterized in that: It also includes an electric lift and a fall arrestor, wherein the electric lift is vertically installed on the outer surface of the distillation column body; The fall protection assembly includes a left telescopic cylinder group, a right telescopic cylinder group, and an elastic rubber strip. The left telescopic cylinder group and the right telescopic cylinder group are located on the left and right sides of the electric lift, respectively. The left telescopic cylinder group includes multiple left telescopic cylinder units, and the right telescopic cylinder group includes multiple right telescopic cylinder units. The cylinder body and telescopic shaft of all left telescopic cylinder units are arc-shaped, and the cylinder body and telescopic shaft of all right telescopic cylinder units are arc-shaped. All left telescopic cylinder units are fixedly connected to the outer surface of the distillation column body in the vertical direction, and all right telescopic cylinder units are fixedly connected to the outer surface of the distillation column body in the vertical direction. All left telescopic cylinder units correspond one-to-one with all right telescopic cylinder units, and the bending direction of any right telescopic cylinder unit is opposite to the bending direction of the corresponding left telescopic cylinder unit. The elastic rubber strip is provided in two parts. One elastic rubber strip is fixedly connected to the end of the telescopic shaft of all left telescopic cylinder units, and the other elastic rubber strip is fixedly connected to the end of the telescopic shaft of all right telescopic cylinder units. The two elastic rubber strips are vertically distributed and in contact by both the left and right telescopic cylinder groups extending out. The electric lift includes electric guide rails, steps, and handrails; there are two electric guide rails, which are parallel and vertically fixed to the outer surface of the distillation column body; the two ends of the steps are slidably connected to the two electric guide rails respectively; the handrails are fixed above the electric guide rails and are slidably connected to the two electric guide rails; the steps move up and down along the electric guide rails, thereby driving the handrails to move up and down synchronously. One of the two electric guide rails is provided with multiple distance sensors on its side wall. All distance sensors are vertically distributed on the side wall of the corresponding electric guide rail. The handrail is raised and lowered by the pedal so that it passes the sensing end of the distance sensor. When a rod-shaped object passes through the anti-fall assembly, it cannot retract all of the left and right telescopic cylinder groups simultaneously. Instead, the specific position of the notch adapts to the rising position of the rod-shaped object.

2. The distillation column for recovering organic solvents from waste panels according to claim 1, characterized in that: The distance between any two adjacent left telescopic cylinder units in the left telescopic cylinder group shall not exceed 0.5 meters.

3. The distillation column for recovering organic solvents from waste panels according to claim 1, characterized in that: The distance between any two adjacent right telescopic cylinder units in the right telescopic cylinder group shall not exceed 0.5 meters.

4. The distillation column for recovering organic solvents from waste panels according to claim 1, characterized in that: The left side of the left telescopic cylinder assembly is provided with a left anti-fall net, which is fixedly connected to the cylinder seat of each left telescopic cylinder unit.

5. The distillation column for recovering organic solvents from waste panels according to claim 1, characterized in that: The right side of the right telescopic cylinder assembly is provided with a right anti-fall net, which is fixedly connected to the cylinder seat of each right telescopic cylinder unit.

6. The distillation column for recovering organic solvents from waste panels according to claim 1, characterized in that: The handrail frame includes a left handrail slidably connected to one of the electric guide rails and a right handrail slidably connected to the other electric guide rail; the left and right sides of the two electric guide rails are respectively provided with vertical slide grooves with a T-shaped cross section; both ends of the right handrail and both ends of the left handrail are provided with two T-shaped heads; the two T-shaped heads of the left handrail are slidably connected to the vertical slide groove of one of the electric guide rails, and the two T-shaped heads of the right handrail are slidably connected to the vertical slide groove of the other electric guide rail; the right handrail and the left handrail are respectively fixedly connected to the pedal by a fixing rod.

7. A method for lifting and lowering a distillation column, characterized in that: The distillation column used in claim 6 for recovering organic solvents from waste panels has distance sensors A1-A1 arranged from bottom to top. n The left telescopic cylinder units arranged from bottom to top are left telescopic cylinder units B1-B. n The right telescopic cylinder units arranged from bottom to top are right telescopic cylinder units C1-C1. n This includes the following steps: S1. All left telescopic cylinder units and all right telescopic cylinder units extend, so that the two elastic rubber strips contact each other, and the electric lift is located at the lowest point of the electric guide rail. S2. The pedal drives the handrail to rise simultaneously. When the handrail passes the distance sensor A1, the left telescopic cylinder unit B1 and the right telescopic cylinder unit C1 at the lowest point retract simultaneously, thereby separating the lower ends of the two elastic rubber strips and forming a notch. S3. The pedal drives the handrail to continue to rise simultaneously. When the handrail passes the second distance sensor A2, the left telescopic cylinder unit B2 and the right telescopic cylinder unit C2 retract simultaneously, thereby causing the elastic rubber strips of the corresponding parts of the left telescopic cylinder unit B2 and the right telescopic cylinder unit C2 to separate and form a gap. At the same time, the left telescopic cylinder unit B1 and the right telescopic cylinder unit C1 extend simultaneously, thereby causing the elastic rubber strips of the corresponding parts of the left telescopic cylinder unit B1 and the right telescopic cylinder unit C1 to contact. S4. Repeat S3 until the left telescopic cylinder unit B. n and right telescopic cylinder unit C n The corresponding elastic rubber strips separate and form notches, while the left telescopic cylinder unit B... n-1 and right telescopic cylinder unit C n-1 Simultaneously extending, thus causing the left telescopic cylinder unit B... n-1 and right telescopic cylinder unit C n-1 The corresponding elastic rubber strips are in contact.

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