Spraying method and spraying system for ship hatch cover assembly line

Abstract

The invention discloses a ship hatch cover assembly line spraying method and spraying system. The ship hatch cover assembly line spraying system comprises a spraying operation area formed by enclosing a hatch cover through a fence, and a hatch cover top spraying device, a hatch cover bottom spraying device and a hatch cover side face spraying device are arranged in the spraying operation area; the hatch cover top spraying device conducts covering spraying on the upper cover face of the hatch cover through an upper spraying gun capable of moving in the horizontal plane. The hatch cover bottom spraying device conducts covering spraying on the lower cover face of the hatch cover through a lower spraying gun capable of moving in the horizontal plane and a repairing spraying gun capable of vertically ascending, descending and horizontally moving. The hatch cover side face spraying device conducts covering spraying through a side spraying gun which can move around the side face of the hatch cover and swing relative to the corner of the side face of the hatch cover. According to the spraying device, the upper cover face, the lower cover face and the side faces of the hatch cover are cooperatively sprayed in different areas, all-dimensional spraying of the hatch cover is achieved, spraying is uniform, and the spraying efficiency and quality are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of ship hatch cover spraying, and in particular relates to a ship hatch cover assembly line spraying method and a spraying system. Background Art

[0002] Hatch covers are widely used on ships, and are used on bulk carriers and container ships. In shipbuilding and maintenance, hatch cover spraying is one of the key processes for corrosion prevention, rust prevention and cargo hold protection. However, traditional spraying methods mainly rely on manual operation, which has problems such as low efficiency, uneven film thickness, poor spraying quality at corners and sides, and is difficult to meet the needs of large-scale production. In addition, due to the large size and complex shape of ship hatch covers, there is still a lack of efficient and adaptable automated spraying solutions. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a method and system for spraying a ship hatch cover assembly line, which realizes all-round spraying of the hatch cover by carrying out coordinated spraying of the upper cover surface, lower cover surface and side surface of the hatch cover in different areas, and the spraying is uniform, thereby improving the spraying efficiency and quality.

[0004] Technical solution: To achieve the above purpose, the present invention provides a method for spraying a ship hatch cover assembly line, and the specific steps are as follows:

[0005] Step 1: construct a fence in the spraying workshop, the area enclosed by the fence is the spraying operation area, and a support frame for supporting the hatch cover is set in the spraying operation area, and the hatch cover is supported to be placed in a horizontal posture, so that one cover surface of the hatch cover is horizontally facing upward, the other cover surface is horizontally facing downward, and the side of the cover faces the fence;

[0006] Step 2: a movable upper spray gun is arranged toward and perpendicular to the upper cover surface of the hatch cover, and the upper spray gun moves in a plane parallel to the upper cover surface to cover the upper cover surface with spray coating;

[0007] Step 3: a movable lower spray gun is arranged toward and perpendicular to the lower cover surface of the hatch cover, and the lower spray gun moves in a plane parallel to the lower cover surface to cover the lower cover surface with spray coating;

[0008] Step 4: a movable side spray gun is arranged toward the side of the hatch cover, and the side spray gun moves around the side of the cover to cover the side of the hatch cover with spray coating;

[0009] Step 2, step 3, and step 4 can be performed simultaneously, or step 2 and step 3 can be performed simultaneously, and step 4 can be performed last.

[0010] Furthermore, during the execution of "step 4", since the side surface of the hatch cover is not a flat surface but has corners, these corners cannot be covered by the side spray gun when it moves to spray, resulting in uneven paint film thickness. Based on this, it also includes:

[0011] Step 5: When the side spray gun moves to the corner position of the cover side of the hatch cover, swing the side spray gun to tilt it toward the corner and cover the inner part of the corner with spray.

[0012] Furthermore, since the hatch cover is supported by the support frame in "step one", in the spraying operation of "step three", when the lower spray gun moves to the bottom of the support frame, the shielding effect of the support frame makes it impossible to spray the shielded part of the lower cover surface. Based on this, it also includes:

[0013] Step six: A repair spray gun that can be raised, lowered and translated is provided on the support frame. In "step one" to "step five", the repair spray gun is hidden in the groove guide rail provided on the support frame. After completing "step one" to "step five", lift the hatch cover to the support surface that is separated from the support frame, and the repair spray gun rises to be exposed outside the groove guide rail. The repair spray gun moves back and forth along the groove guide rail to perform repair spraying on the obstructed part of the lower cover surface.

[0014] A spraying system for a ship hatch cover assembly line spraying method comprises a spraying operation area formed by a hatch cover enclosed by a fence, wherein a hatch cover top spraying device, a hatch cover bottom spraying device and a hatch cover side spraying device are arranged in the spraying operation area; the hatch cover top spraying device performs covering spraying on the upper cover surface of the hatch cover by an upper spray gun movable in a horizontal plane; the hatch cover bottom spraying device performs covering spraying on the lower cover surface of the hatch cover by a lower spray gun movable in a horizontal plane and a repair spray gun capable of vertical lifting and translation; the hatch cover side spraying device performs covering spraying by a side spray gun capable of moving around the side of the hatch cover and swinging relative to the corner of the cover side.

[0015] Furthermore, the hatch cover top spraying device comprises a hanging column, a first upper crossbeam, an upper carriage, a second upper crossbeam and an upper linear servo slide which are sequentially connected from top to bottom; the hatch cover top spraying device is suspended on the top of the spraying workshop by a hanging column; the first upper crossbeam and the second upper crossbeam are arranged vertically; the upper linear servo slide is arranged parallel to the second upper crossbeam, and the upper spray gun is installed on the upper linear servo slide in a downward posture; the upper spray gun is driven by the upper carriage to displace along the length direction of the first upper crossbeam, and is driven by the upper linear servo slide to displace along the length direction of the second upper crossbeam.

[0016] Further, the hatch cover bottom spraying device comprises a support frame fixed by a base, a lower beam connected to the bottom of the support frame by a lower carriage, and a lower linear servo slide mounted parallel to the lower beam; the upper surface of the support frame is a support surface for supporting the hatch cover, and the lower beam is arranged vertically to the support frame; the lower spray gun is driven by the lower carriage to move along the length direction of the support frame, and is moved along the length direction of the lower beam by the lower linear servo slide;

[0017] The support frame is provided with a lifting mechanism and a lifting mechanism; the lifting mechanism is located on the side of the support frame and is arranged in the groove that runs through the side and the top of the support frame, and is used to lift the hatch cover to the support surface that is separated from the support frame; the support surface of the support frame is provided with a groove guide rail, and a slider is provided in the groove guide rail through the screw sliding driven by a servo motor, and the repair spray gun is installed on the slider through a lifting mechanism; the repair spray gun is driven by the lifting mechanism to exchange positions inside and outside the groove guide rail, and when the repair spray gun is exposed outside the groove guide rail, it follows the slider to move along the length direction of the support frame under the state that the servo motor provides driving force.

[0018] Furthermore, the hatch cover side spraying device includes an electric guide rail, a transverse telescopic rod, a swing mechanism, an industrial camera and a distance sensor; the electric guide rail is laid along the fence; the transverse telescopic rod is installed on the electric guide rail through a base, and the transverse telescopic rod faces the cover side of the hatch cover; the telescopic end of the transverse telescopic rod is provided with a mounting plate, the side spray gun is swung left and right on the mounting plate through a swing mechanism, the industrial camera and the distance sensor are installed on the mounting plate and distributed on both sides of the side spray gun; the side spray gun is driven by the electric guide rail to move around the cover side of the hatch cover, and when it reaches the corner of the cover side, it is driven by the swing mechanism to swing toward the corner.

[0019] Furthermore, the fence is composed of a walking platform, stairs and railings, and the electric guide rail is arranged on the railings.

[0020] Beneficial effects: The present invention realizes all-round spraying of the hatch cover by performing coordinated spraying of the upper cover surface, lower cover surface and side surfaces of the hatch cover in different areas, and the spraying is uniform, thereby improving the spraying efficiency and quality. The spraying method is combined with the spraying system to provide a complete automated spraying solution, which is suitable for large-scale production and can achieve all-round coverage, precise spraying and adapt to automated spraying of hatch covers of different sizes. It is of great significance to improving spraying efficiency and quality and reducing labor costs and environmental risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the spraying system for the ship hatch cover assembly line spraying method Figure 1 ;

[0022] Figure 2 Schematic diagram of the spraying system for the ship hatch cover assembly line spraying method Figure 2 ;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the spraying device on the top of the hatch cover;

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the hatch cover bottom spraying device;

[0025] Figure 5 It is a top view structural schematic diagram of the hatch cover side spraying device;

[0026] Figure 6 It is an enlarged schematic diagram of part of the structure of the hatch cover side spraying device. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] A method for spraying a ship hatch cover assembly line, the specific steps are as follows:

[0029] Step 1: construct a fence in the spraying workshop, the area enclosed by the fence is the spraying operation area, and a support frame for supporting the hatch cover is set in the spraying operation area, and the hatch cover is supported to be placed in a horizontal posture, so that one cover surface of the hatch cover is horizontally facing upward, the other cover surface is horizontally facing downward, and the side of the cover faces the fence;

[0030] Step 2: a movable upper spray gun is arranged toward and perpendicular to the upper cover surface of the hatch cover, and the upper spray gun moves in a plane parallel to the upper cover surface to cover the upper cover surface with spray coating;

[0031] Step 3: a movable lower spray gun is arranged toward and perpendicular to the lower cover surface of the hatch cover, and the lower spray gun moves in a plane parallel to the lower cover surface to cover the lower cover surface with spray coating;

[0032] Step 4: a movable side spray gun is arranged toward the side of the hatch cover, and the side spray gun moves around the side of the cover to cover the side of the hatch cover with spray coating;

[0033] Step 2, step 3, and step 4 can be performed simultaneously, or step 2 and step 3 can be performed simultaneously, and step 4 can be performed last. Therefore, by performing coordinated spraying of the upper cover surface, the lower cover surface, and the side surface of the hatch cover in different regions, all-round spraying of the hatch cover is achieved, the spraying is uniform, and the spraying efficiency and quality are improved.

[0034] In the process of executing "Step 4", since the side of the hatch cover is not a flat surface, there are corners. When the side spray gun moves to spray, these corners cannot cover the inner part of the corners, resulting in uneven paint film thickness. Based on this, it also includes:

[0035] Step 5: When the side spray gun moves to the corner of the hatch cover, swing the side spray gun so that it is tilted toward the corner and sprays the inner part of the corner. In order to solve the problem of spraying at the corner, the side spray gun is tilted and swung to ensure the uniformity of the paint film on the inner side of the corner.

[0036] Since the hatch cover is supported by the support frame in "step one", in the spraying operation of "step three", when the lower spray gun moves to the bottom of the support frame, the shielded part of the lower cover surface cannot be sprayed due to the shielding effect of the support frame. Based on this, it also includes:

[0037] Step six: The support frame is provided with a repair spray gun that can be raised, lowered and translated. In "Step 1" to "Step 5", the repair spray gun is hidden in the groove guide rail provided on the support frame. After completing "Step 1" to "Step 5", lift the hatch cover to the support surface that is separated from the support frame, and the repair spray gun rises until it is exposed outside the groove guide rail. The repair spray gun moves back and forth along the groove guide rail to perform repair spraying on the obstructed part of the lower cover surface. By setting up a repair spray gun, the problem of incomplete spraying of the lower cover surface caused by obstruction of the support frame is solved, and the integrity of the spraying is further improved. Because the obstructed part is relatively small and the workload is small, in order to speed up the progress, quick-drying paint can be used directly to quickly dry and solidify to improve efficiency.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5 As shown, a spraying system of a ship hatch cover assembly line spraying method comprises a spraying operation area formed by a fence 1 enclosing a hatch cover 2, in which a hatch cover top spraying device 3, a hatch cover bottom spraying device 4 and a hatch cover side spraying device 5 are arranged; the hatch cover top spraying device 3 performs covering spraying on the upper cover surface of the hatch cover 2 by an upper spray gun 30 movable in a horizontal plane; the hatch cover bottom spraying device 4 performs covering spraying on the lower cover surface of the hatch cover 2 by a lower spray gun 40 movable in a horizontal plane and a repair spray gun 41 capable of vertical lifting and translation; the hatch cover side spraying device 5 performs covering spraying by a side spray gun 50 capable of moving around the side of the hatch cover 2 and swinging relative to the corner of the cover side. The present invention realizes all-round spraying of the hatch cover 2 by performing coordinated spraying of the upper cover surface, the lower cover surface and the side surface of the hatch cover 2 in different areas, the spraying is uniform, and the spraying efficiency and quality are improved. The spraying method is combined with the spraying system to provide a complete automated spraying solution, which is suitable for large-scale production and can achieve all-round coverage, precise spraying and adapt to automated spraying of hatch covers of different sizes. It is of great significance to improve spraying efficiency and quality and reduce labor costs and environmental risks.

[0039] like Figure 3 As shown, the hatch cover top spraying device 3 comprises a suspending column 31, a first upper beam 32, an upper carriage 33, a second upper beam 34 and an upper linear servo slide 35 which are sequentially connected from top to bottom; the hatch cover top spraying device 3 is suspended on the top of the spraying workshop by the suspending column 31; the first upper beam 32 and the second upper beam 34 are arranged vertically; the upper linear servo slide 35 and the second upper beam 34 are arranged in parallel, and the upper spray gun 30 is installed on the upper linear servo slide 35 in a downward posture; the upper spray gun 30 is driven by the upper carriage 33 to move along the length direction of the first upper beam 32, and is driven by the upper linear servo slide 35 to move along the length direction of the second upper beam 34. The upper spray gun 30 is more flexible and accurately positioned, and can adapt to hatch covers 2 of different sizes, cover and spray their upper cover surfaces, and enhance applicability.

[0040] like Figure 4 As shown, the hatch cover bottom spraying device 4 includes a support frame 43 fixed by a base 42, a lower beam 45 connected to the bottom of the support frame 43 by a lower carriage 44, and a lower linear servo slide 46 installed parallel to the lower beam 45; the upper surface of the support frame 43 is a supporting surface for supporting the hatch cover 2, and the lower beam 45 is arranged vertically to the support frame 43; the lower spray gun 40 is driven by the lower carriage 44 to move along the length direction of the support frame 43, and is moved along the length direction of the lower beam 45 by the lower linear servo slide 46; the lower spray gun 40 also has the advantages of high flexibility and accurate positioning, and can adapt to hatch covers 2 of different sizes to spray their lower cover surfaces, thereby enhancing applicability. The support frame 43 is provided with a lifting mechanism 47 and a lifting mechanism 48; the lifting mechanism 47 is located on the side of the support frame 43 and is arranged in a slot 431 that runs through the side and top of the support frame 43, and is used to lift the hatch cover 2 to the support surface that is separated from the support frame 43; the support surface of the support frame 43 is provided with a groove guide rail 430, and a slider is provided in the groove guide rail 430 through the screw driven by the servo motor, and the repair spray gun 41 is installed on the slider through the lifting mechanism 48; the repair spray gun 41 can be driven by the lifting mechanism 48 to exchange positions inside and outside the groove guide rail 430, and when the repair spray gun 41 is exposed outside the groove guide rail 430, it moves along the length direction of the support frame 43 following the slider under the state of driving force provided by the servo motor. The repair spray gun 41 can solve the problem of incomplete spraying of the lower cover surface caused by the shielding of the lower spray gun 40 by the support frame 43, and further improve the integrity and reliability of the spraying. In addition, the arrangement of the slot 431 provides a hidden space for the lifting mechanism 47 to avoid blocking the spraying operation of the lower spray gun 40 .

[0041] like Figure 5As shown, the hatch cover side spraying device 5 includes an electric guide rail 51, a transverse telescopic rod 52, a swing mechanism 53, an industrial camera 54 and a distance sensor 55; the electric guide rail 51 is laid along the fence 1; the transverse telescopic rod 52 is installed on the electric guide rail 51 through a base, and the transverse telescopic rod 52 faces the cover side of the hatch cover 2; the telescopic end of the transverse telescopic rod 52 is provided with a mounting plate 56, and the side spray gun 50 can be swung left and right on the mounting plate 56 through a swing mechanism 53, and the industrial camera 54 and the distance sensor 55 are installed on the mounting plate 56 and distributed on both sides of the side spray gun 50; the side spray gun 50 is driven by the electric guide rail 51 to move around the cover side of the hatch cover 2, and when it reaches the corner of the cover side, it is driven by the swing mechanism 53 to swing toward the corner. The hatch cover side spraying device integrates an industrial camera 54 and a distance sensor 55 for monitoring the spraying distance and quality. It can monitor the spraying process in real time, coordinate the spraying distance adjustment of the lateral telescopic rod 52 and the spraying angle adjustment of the side spray gun 50 by the swing mechanism 53, ensure the precise control of the spraying distance, avoid uneven paint film thickness, and improve the automation level. More specifically, Figure 6 As shown, the swing mechanism 53 includes a swing shaft 3.1, a swing rod 3.2, and a swing servo motor 3.3. The swing rod 3.2 is swingably connected to the mounting plate 56 through the swing shaft 3.1. The swing servo motor 3.3 is drive-connected to the swing shaft 3.1. The side spray gun 50 is installed at the rod end of the swing rod 3.2.

[0042] The fence 1 is composed of a walking platform, stairs and railings, and the electric guide rail 51 is arranged on the railings to facilitate monitoring and maintenance by staff.

[0043] In summary, the present invention realizes all-round and uniform spraying of ship hatch covers, solves the problems of uneven paint film and low efficiency of traditional spraying, especially the optimization of corner spraying, repair spray gun design and visual sensor integration, which significantly improve the spraying quality, efficiency and automation level.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for spraying a ship hatch cover assembly line, characterized in that: The specific steps are as follows: Step 1: construct a fence in the spraying workshop, the area enclosed by the fence is the spraying operation area, and a support frame for supporting the hatch cover is set in the spraying operation area, and the hatch cover is supported to be placed in a horizontal posture, so that one cover surface of the hatch cover is horizontally facing upward, the other cover surface is horizontally facing downward, and the side of the cover faces the fence; Step 2: a movable upper spray gun is arranged toward and perpendicular to the upper cover surface of the hatch cover, and the upper spray gun moves in a plane parallel to the upper cover surface to cover the upper cover surface with spray coating; Step 3: a movable lower spray gun is arranged toward and perpendicular to the lower cover surface of the hatch cover, and the lower spray gun moves in a plane parallel to the lower cover surface to cover the lower cover surface with spray coating; Step 4: a movable side spray gun is arranged toward the side of the hatch cover, and the side spray gun moves around the side of the cover to cover the side of the hatch cover with spray coating; Step 2, step 3, and step 4 can be performed simultaneously, or step 2 and step 3 can be performed simultaneously, and step 4 can be performed last.

2. A method for spraying a ship hatch cover assembly line according to claim 1, characterized in that: In the process of executing "Step 4", since the side of the hatch cover is not flat and has corners, these corners cannot be covered by the side spray gun when it moves to spray, resulting in uneven paint film thickness. Based on this, it also includes: Step 5: When the side spray gun moves to the corner position of the cover side of the hatch cover, swing the side spray gun to tilt it toward the corner and cover the inner part of the corner with spray.

3. A method for spraying a ship hatch cover assembly line according to claim 2, characterized in that: Since the hatch cover is supported by the support frame in "step one", in the spraying operation of "step three", when the lower spray gun moves to the bottom of the support frame, the shielded part of the lower cover surface cannot be sprayed due to the shielding effect of the support frame. Based on this, it also includes: Step 6: A repair spray gun that can be raised, lowered and translated is provided on the support frame. In "Step 1" to "Step 5", the repair spray gun is hidden in the groove guide rail provided on the support frame. After completing "Step 1" to "Step 5", lift the hatch cover to detach from the supporting surface of the support frame, and the repair spray gun rises to be exposed outside the groove guide rail. The repair spray gun moves back and forth along the groove guide rail to perform repair spraying on the obstructed part of the lower cover surface.

4. The spraying system of the ship hatch cover assembly line spraying method according to claim 3 is characterized by: The invention comprises a spraying operation area formed by enclosing a hatch cover (2) with a fence (1), wherein a hatch cover top spraying device (3), a hatch cover bottom spraying device (4) and a hatch cover side spraying device (5) are arranged in the spraying operation area; the hatch cover top spraying device (3) performs covering spraying on the upper cover surface of the hatch cover (2) by means of an upper spray gun (30) movable in a horizontal plane; the hatch cover bottom spraying device (4) performs covering spraying on the lower cover surface of the hatch cover (2) by means of a lower spray gun (40) movable in a horizontal plane and a repair spray gun (41) capable of vertical lifting and translation; the hatch cover side spraying device (5) performs covering spraying by means of a side spray gun (50) capable of moving around the side of the hatch cover (2) and swinging relative to the corner of the cover side.

5. The spraying system of the assembly line spraying method for ship hatch covers according to claim 4, characterized in that: The hatch cover top spraying device (3) comprises a suspension column (31), a first upper crossbeam (32), an upper carriage (33), a second upper crossbeam (34) and an upper linear servo slide (35) which are connected in sequence from top to bottom; the hatch cover top spraying device (3) is suspended on the top of the spraying workshop through the suspension column (31); the first upper crossbeam (32) and the second upper crossbeam (34) are arranged vertically; the upper linear servo slide (35) and the second upper crossbeam (34) are arranged in parallel, and the upper spray gun (30) is installed on the upper linear servo slide (35) in a downward posture; the upper spray gun (30) is driven by the upper carriage (33) to move along the length direction of the first upper crossbeam (32), and is driven by the upper linear servo slide (35) to move along the length direction of the second upper crossbeam (34).

6. The spraying system of the assembly line spraying method for ship hatch covers according to claim 4, characterized in that: The hatch cover bottom spraying device (4) comprises a support frame (43) fixed by a base (42), a lower beam (45) connected to the bottom of the support frame (43) by a lower carriage (44), and a lower linear servo slide (46) installed parallel to the lower beam (45); the upper surface of the support frame (43) is a support surface for supporting the hatch cover (2), and the lower beam (45) is arranged vertically to the support frame (43); the lower spray gun (40) is driven by the lower carriage (44) to move along the length direction of the support frame (43), and is moved along the length direction of the lower beam (45) by the lower linear servo slide (46); The support frame (43) is provided with a lifting mechanism (47) and a lifting mechanism (48); the lifting mechanism (47) is located on the side of the support frame (43) and is arranged in a slot (431) penetrating the side and top of the support frame (43), and is used to lift the hatch cover (2) to a support surface that is separated from the support frame (43); the support surface of the support frame (43) is provided with a groove guide rail (430), and a slider is provided in the groove guide rail (430) through a screw driven by a servo motor, and the repair spray gun (41) is installed on the slider through the lifting mechanism (48); the repair spray gun (41) can be driven by the lifting mechanism (48) to exchange positions inside and outside the groove guide rail (430), and when the repair spray gun (41) is exposed outside the groove guide rail (430), it moves along the length direction of the support frame (43) following the slider under the state that the servo motor provides driving force.

7. The spraying system of the ship hatch cover assembly line spraying method according to claim 4, characterized in that: The hatch cover side spraying device (5) comprises an electric guide rail (51), a transverse telescopic rod (52), a swing mechanism (53), an industrial camera (54) and a distance sensor (55); the electric guide rail (51) is laid along the fence (1); the transverse telescopic rod (52) is installed on the electric guide rail (51) through a base, and the transverse telescopic rod (52) faces the cover side of the hatch cover (2); the telescopic end of the transverse telescopic rod (52) is provided with a mounting plate (56), the side spray gun (50) can be swung left and right on the mounting plate (56) through the swing mechanism (53), the industrial camera (54) and the distance sensor (55) are installed on the mounting plate (56) and distributed on both sides of the side spray gun (50); the side spray gun (50) is driven by the electric guide rail (51) to move around the cover side of the hatch cover (2), and when reaching the corner of the cover side, it is driven by the swing mechanism (53) to swing toward the corner.

8. The spraying system of the ship hatch cover assembly line spraying method according to claim 7, characterized in that: The fence (1) is composed of a walking platform, stairs and railings, and the electric guide rail (51) is arranged on the railings.

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