Step chain supporting device and step chain supporting method

Abstract

The invention provides a step chain supporting device and a step chain supporting method. In the maintenance operation accompanying local cutting of the step chain of the passenger conveyor, the chain end part of the cut step chain is prevented from interfering with equipment in a truss. The step chain of the passenger conveyor is formed into a ring shape by connecting the chain end parts of a plurality of end division chains through a joint connecting rod. A pin hole into which a connecting pin for engaging the link is inserted is provided at the chain end of the end split chain. The step chain supporting device is provided with a shaft part which is inserted into a pin hole in the end part of the chain when a part of the step chain is cut off by detaching a connecting rod; and a roller portion disposed at one end of the shaft portion. The roller portion is configured to be guided along the drive rail in a state where the shaft portion is inserted into the pin hole.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a technology of a step chain support device that is used when supporting a chain end portion of a step chain in maintenance work that involves partially cutting the step chain of a passenger conveyor. BACKGROUND

[0002] A technology related to a replacement method of a step link of an escalator is disclosed in Patent Literature 1. According to the replacement method, in an escalator in which steps are circulated and moved via a plurality of step links that are linked in a ring shape, it is possible to shorten the time required for replacement work of a worn step link.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: International Publication No. 2021 / 186715 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In a passenger conveyor typified by an escalator, a structure is known in which steps are circulated and moved via a step chain that is linked in a ring shape instead of a step link. The step chain is provided so as to extend inside a truss erected on upper and lower floors. Therefore, in maintenance of the passenger conveyor, for example, when steps are removed to form an opening for maintenance of equipment in the truss, the step chain sometimes obstructs the work by being erected in a part of the opening.

[0008] As a countermeasure therefor, work is performed in which, in a state in which the ring-shaped step chain is partially cut in a lower machine room in the truss, a manual winding operation is performed in which a handle portion of a motor pulley of the passenger conveyor is turned by hand, and the cut chain end portion is wound up to a target position. At this time, a chain remaining portion from the cut chain end portion to the nearest step shaft is hanging downward, and therefore there is a possibility that the chain remaining portion interferes with the equipment in the truss in the manual winding operation of the passenger conveyor. Therefore, a worker needs to, for example, operate the escalator while holding the chain end portion, and there is a problem in that work efficiency is poor. The technology of the above-described Patent Literature 1 is a technology related to replacement of a step link of an escalator, and does not propose any investigation of the problem in which the end portion of a chain that is cut as in a step chain hangs downward.

[0009] The present disclosure was completed in order to solve the above-described problem, and aims to provide a technology in which, in maintenance work that involves partial cutting of a step chain of a passenger conveyor, it is possible to prevent a chain end portion of the cut step chain from interfering with equipment in a truss.

[0010] MEANS FOR SOLVING THE PROBLEM

[0011] The disclosed ladder chain support device supports the chain end of a ladder chain when a portion of the ladder chain has been cut off in a passenger conveyor. The passenger conveyor includes: a ladder chain connected in a loop and moving cyclically; a plurality of ladder shafts equally spaced from the ladder chain; a drive roller disposed on the ladder shaft and guided along a drive track; and a plurality of ladders respectively fixed to the plurality of ladder shafts. The ladder chain is formed into a loop by connecting the chain ends of a plurality of end-segmented chains to each other using connecting rods. Pin holes are provided at the chain ends of the end-segmented chains for inserting connecting pins of the connecting rods. The ladder chain support device includes: a shaft portion inserted into the pin holes at the chain ends when a portion of the ladder chain has been cut off by removing the connecting rods; and a roller portion disposed at one end of the shaft portion. The ladder chain support device is configured such that, with the shaft portion inserted into the pin holes, the roller portion is guided along the drive track.

[0012] Furthermore, the ladder chain support method disclosed herein uses the aforementioned ladder chain support device to support the chain end when a portion of the ladder chain has been cut off. The ladder chain support method includes the following steps: disassembling multiple ladder stages; releasing the tension of the ladder chain; disassembling the connecting rod to cut off a portion of the ladder chain; inserting the shaft of the ladder chain support device into the pin hole of the upper chain end located on the upper side of the ladder chain end, and placing the roller on the upper surface of the drive track; and moving the ladder chain until the upper chain end passes the target position.

[0013] Furthermore, the ladder chain support method disclosed herein uses the aforementioned ladder chain support device to support the chain end when a portion of the ladder chain has been cut off. The ladder chain support method includes the following steps: disassembling multiple ladder stages; releasing the tension of the ladder chain; disassembling the connecting rod to cut off a portion of the ladder chain; inserting the shaft portion of the ladder chain support device into the pin holes of the upper chain end and the lower chain end respectively, and placing the roller portion on the upper surface of the drive track; connecting the upper chain end and the lower chain end using a connecting line; and moving the ladder chain until the upper chain end passes the target position.

[0014] Invention Effects

[0015] According to the technology disclosed herein, the chain end of the cut ladder chain is guided along the upper surface of the drive track by a ladder chain support device. This prevents interference between the chain end and equipment within the truss. Attached Figure Description

[0016] Figure 1 This is a diagram showing the structure of a passenger conveyor with a ladder chain support device according to an application implementation method.

[0017] Figure 2 is a view for explaining a structure of a step periphery of an escalator.

[0018] Figure 3 is a view for explaining a step chain structure.

[0019] Figure 4 is a perspective view enlarging A part in Figure 3

[0020] Figure 5 is a view for explaining a coupling structure realized by a joint link.

[0021] Figure 6 is a schematic view observing a state before and after a step chain is cut from above.

[0022] Figure 7 is a schematic view observing a state after a step chain is cut from Figure 6

[0023] Figure 8 is a view for explaining a structure of a step chain support device.

[0024] Figure 9 is a view for explaining a structure of a step chain support device.

[0025] Figure 10 is a view for explaining a use example of a step chain support device.

[0026] Figure 11 is a view for explaining a use example of a coupling wire.

[0027] Explanation of Reference Signs

[0028] 3: joint link, 4: step chain, 4a: end-divided chain, 4b: pin hole, 5: follower rail, 6: drive rail, 7: passenger step, 8: vertical plate, 10: step chain unit, 12: step shaft, 14: drive roller, 16: follower roller, 20: step chain support device, 22: shaft portion, 24: roller portion, 26: guide portion, 31: outer link, 32: coupling pin, 33: outer plate, 34: split pin, 40: coupling wire, 42: wire portion, 44: locking portion, 50: holding coupling belt, 101: truss, 102: entrance, 103: exit, 104: upper machine room, 105: motor, 106: control device, 107: speed reducer, 108: shaft, 109: upper sprocket, 110: lower machine room, 112: lower sprocket. DETAILED DESCRIPTION

[0029] ​​Embodiments will be described below with reference to the accompanying drawings. Like reference numerals are used to designate like elements throughout the drawings, and repeated description thereof will be omitted.

[0030] Embodiments.

[0031] 1. Structure of escalator

[0032] Figure 1 is a diagram showing a structure of a passenger conveyor that applies the step chain support device of the embodiment. Figure 1 An escalator is shown as an example of a passenger conveyor.

[0033] The escalator has a truss 101 and a plurality of steps 1. The truss 101 is erected on upper and lower floors. The passenger of the escalator moves from an entrance 102 to an exit 103 on the steps 1. Figure 1 An escalator that goes up is shown. Figure 1 The escalator shown can also be an escalator that goes down.

[0034] A upper machine room 104 is provided below the exit 103. The upper machine room 104 is a space formed in an upper portion of the truss 101. A motor 105 and a control device 106 are provided in the upper machine room 104. The motor 105 drives the steps 1. The control device 106 controls the motor 105.

[0035] For example, the motor 105 rotates a shaft 108 provided in the upper machine room 104 via a speed reducer 107. A upper sprocket 109 is provided on the shaft 108. A step chain 4 is wound around the upper sprocket 109.

[0036] A lower machine room 110 is provided below the entrance 102. The lower machine room 110 is a space formed in a lower portion of the truss 101. A lower sprocket 112 is provided in the lower machine room 110. The step chain 4 is wound around the lower sprocket 112.

[0037] The shaft 108 can rotate in both directions. When the motor 105 rotates the shaft 108 in one direction, the steps 1 on which the passengers are carried move obliquely upward as in the example shown in the present embodiment. When the motor 105 rotates the shaft 108 in the other direction, the steps 1 move obliquely downward.

[0038] The movement of the steps 1 is guided by a running track. The steps 1 move obliquely upward in a state where the passengers are carried by being guided by the running track. If it is an escalator that goes down, the steps 1 move obliquely downward in a state where the passengers are carried. The escalator has, for example, a drive track 6 and a follower track 5 as the running track. The running track is provided to the truss 101. The running track is disposed from below the entrance 102 to below the exit 103.

[0039] 2. Structure of step periphery of escalator

[0040] Figure 2 is a view for explaining the structure of the step periphery of the escalator. In Figure 2 , the structure of the inside of the truss of the step periphery is shown in a partially transparent manner.

[0041] The step 1 is provided with a passenger step 7 and a riser 8. The passenger step 7 is a plate-like member that is actually stepped on when a passenger moves. The riser 8 is a member that corresponds to a kick plate in the step 1. The riser 8 extends downward from the edge of the passenger step 7.

[0042] In addition, in the step 1, as a main structure, a step shaft 12, a pair of drive rollers 14, and a pair of follower rollers 16 are provided. The step shaft 12 is fixed to a joint provided on the back surface of the passenger step 7. The step shaft 12 of a plurality of steps 1 is fixed to the step chain 4. By this, the plurality of steps 1 are linked to the step chain 4 in a ring shape. When the step chain 4 moves, the passenger step 7 is pulled and moved by the step shaft 12. The structure of the step chain 4 is described in detail later.

[0043] The drive rollers 14 are provided at both end portions of the step shaft 12 in a rotatable manner, respectively. The drive rollers 14 travel in rotation on the upper surface of the drive rail 6 shown in Figure 1 . The follower rollers 16 are provided at both ends in the width direction of the lower end portion of the step 1 in a rotatable manner. The follower rollers 16 travel in rotation on the upper surface of the follower rail 5 shown in Figure 1 .

[0044] 3. Structure of step chain of escalator

[0045] Figure 3 is a view for explaining the structure of the step chain. The step chain 4 is constituted by linking the chain end portions of a plurality of step chain units 10 of the split end chain 4a to each other in a ring shape with the joint link 3, respectively. Each step chain unit 10 includes a pair of split end chains 4a, a plurality of step shafts 12 fixed in a manner of being erected between the pair of split end chains 4a, and a drive roller 14 installed at both ends of each step shaft 12. The plurality of step shafts 12 are provided at equal intervals along the extension direction of the pair of split end chains 4a. The number of the step shafts 12 is six, for example.

[0046] The joint link 3 links the chain end portions of the split end chains 4a of the adjacent step chain units 10 to each other. Figure 4 is an enlarged perspective view of A portion in Figure 3 . In addition, Figure 5is a diagram for explaining a link structure realized by a joint link. The joint link 3 is provided with an outer link 31 having two link pins 32 erected on an outer plate, an outer plate 33 having pin holes, and two split pins 34. The two link pins 32 of the outer link 31 are respectively inserted into pin holes 4b of chain end portions of adjacent end-divided chains 4a. The pin holes of the outer plate 33 are inserted on the two link pins 32 of the outer link 31, and the split pins 34 that prevent falling from above are installed.

[0047] 4. Problem at the time of cutting of step chain

[0048] In the maintenance of an escalator, various equipment in the truss 101 is sometimes checked by, for example, removing the steps 1. At this time, the step chain 4 or the step shaft 12 sometimes hinders the work. As a countermeasure thereof, a worker removes the joint link 3 in the lower machine room 110 and partially cuts the annular step chain 4. In the chain end portions in which the joint link 3 is installed, the chain end portion located on the upper side is also referred to as an "upper chain end portion", and the chain end portion located on the lower side is also referred to as a "lower chain end portion". Then, by manually winding the escalator in this state, the cut upper chain end portion is wound upward, and an opening portion in which the step chain 4 and the step shaft 12 are not present is formed. Furthermore, the manual winding here is a winding in which the step chain 4 is moved in a circulation by rotating the handle portion of the motor pulley of the escalator by hand.

[0049] Figure 6 is a schematic view of the state before and after the cutting of the step chain, as viewed from above. In addition, Figure 7 is a schematic view of the state after the cutting of the step chain, as viewed from the B direction in Figure 6 Furthermore, in Figure 6 , the state before the cutting of the step chain 4 on the left side in the drawing is illustrated, and the state after the cutting of the step chain 4 on the right side in the drawing is illustrated.

[0050] Here, the chain end portions of the end-divided chains 4a linked by the joint link 3 are located near the middle of the arrangement intervals of the step shafts 12. Therefore, when the joint link 3 is removed and the step chain 4 is cut as illustrated in Figure 6 , as illustrated in Figure 7 , the chain remaining portions of the intervals from the nearest step shaft 12 to the chain end portions sag downward in the vertical direction due to gravity. When the escalator is manually wound in this state, the chain end portions can interfere with the equipment in the truss 101.

[0051] The step chain support device of the present embodiment is a device for preventing the chain end portions from interfering with the equipment in the truss 101 at the time of the manual winding of the escalator in the maintenance work including the cutting of the step chain 4. Hereinafter, the structure of the step chain support device will be described in detail.

[0052] 5. Structure of step chain support device

[0053] Figure 8 and Figure 9 is a diagram for explaining the structure of the step chain support device. The step chain support device 20 is provided with a shaft portion 22, a roller portion 24, and a guide portion 26. The roller portion 24 is rotatably fixed to one end side of the shaft portion 22. The shaft portion 22 is inserted into a pin hole 4b of the upper chain end portion of the end split chain 4a. Therefore, the shaft portion 22 is configured to be smaller in shaft diameter than the pin hole 4b so as to be able to be inserted into the pin hole 4b of the upper chain end portion of the end split chain 4a.

[0054] In addition, the roller portion 24 is configured to be the same shape as the drive roller 14, for example, so as to be able to travel on the upper surface of the drive rail 6 in a state in which the shaft portion 22 is inserted into the pin hole 4b. In addition, in a state in which the roller portion 24 is located on the upper surface of the drive rail 6, the shaft portion 22 has a length in which the tip end portion protrudes from the pin hole 4b in order to prevent falling. The guide portion 26 is a disc-shaped member for preventing interference of the roller portion 24 with the step chain 4, and is provided to the end portion of the shaft portion 22 on the roller portion 24 side.

[0055] Figure 10 is a diagram for explaining a use example of the step chain support device. As shown in the diagram, the step chain support devices 20 are respectively installed to the upper chain end portions at the time of cutting one pair of step chains 4. Specifically, the shaft portions 22 are inserted from the outside into the pin holes 4b of the upper chain end portions of the respective one pair of step chains 4, and are installed so that the roller portions 24 are located on the upper surfaces of the drive rails 6.

[0056] When the escalator is manually wound up in this state, the roller portions 24 travel and rotate along the drive rails 6 in a state of supporting the upper chain end portions. Thereby, it is possible to prevent interference with the equipment class caused by sagging of the upper chain end portions, and to move the upper chain end portions of the step chains 4 upward.

[0057] 6. Work steps using the step chain support device 20

[0058] Next, an example of work steps for forming an opening portion at a target position of the truss 101 of the escalator using the step chain support device 20 will be explained. Furthermore, the following work steps also indicate a part of the step chain support method of the chain end portions of the step chain 4.

[0059] First process:

[0060] As a preparation process, the steps 1 are all removed from the escalator.

[0061] Second process:

[0062] The lower sprocket 112 in the lower machine room 110 is stopped at a position where the joint link 3 to be removed is extracted from the sprocket.

[0063] Third step:

[0064] The tension of the step chain 4 is released by releasing the tension of the step chain with the spring.

[0065] Fourth step:

[0066] The joint link 3 to be removed is detached from the step chain 4.

[0067] Fifth step:

[0068] The upper chain end of the step chain 4 on the upper side is inserted into the shaft portion 22 of the step chain support device 20, and the roller portion 24 is disposed on the upper surface of the drive rail 6.

[0069] Sixth step:

[0070] The manual winding operation in the upward direction of the escalator is performed, and the step chain 4 on the upper side is wound upward. Thus, the step chain support device 20 installed on the upper chain end supports the upper chain end while making the roller portion 24 rotate and travel along the drive rail 6. In addition, the step chain 4 on the lower side is recovered into the lower machine room 110 by pulling the step shaft 12.

[0071] Seventh step:

[0072] The manual winding operation is stopped at the position where the next joint link 3 is extracted, and the next joint link 3 is removed. Thus, one step chain unit 10 is separated, and the separated step chain unit 10 is carried out from the lower machine room 110 of the truss 101.

[0073] Eighth step:

[0074] By repeatedly performing the actions of the sixth step and the seventh step, the area where the step chain 4 and the step shaft 12 are not present gradually expands from the lower side of the truss 101 upward. The actions of the sixth step and the seventh step are repeated until the opening expands to the target position.

[0075] According to such a work procedure, interference with equipment caused by sagging of the chain end of the step chain 4 on the upper side can be prevented, and an opening is formed at the target position of the truss 101.

[0076] 7. Modified example of step chain support device

[0077] The step chain support device 20 of the embodiment can also be modified as follows.

[0078] Linking wire 40 and retaining link belt 50

[0079] The ladder chain support device 20 may also have a structure with a pair of connecting lines 40. Figure 11 This diagram illustrates an example of the use of the connecting line. In the above-described operation steps using the ladder chain support device 20, steps six and seven are repeated until the opening is enlarged to the target position. Therefore, for example, the higher the target position is above the truss 101, the more ladder chain units 10 need to be removed from the lower ladder chain 4. In the modified example, the connecting line 40 is a line used to remove only a number of ladder chain units 10 corresponding to the required opening length and connect the upper chain end to the lower chain end.

[0080] The connecting line 40 includes a line portion 42 and locking portions 44 provided at both ends of the line portion 42. The locking portions 44 are configured to hook onto the shaft portion 22 of the ladder chain support device 20, which is inserted into the pin hole 4b. The line portion 42 has a length corresponding to the required opening length. For example, when the required opening length is one ladder chain unit 10, the line portion 42 is set such that the connecting line 40 is the length of the entire ladder chain unit 10.

[0081] In the operation of the modified step chain support device 20 including the connecting line 40, after the seventh step described above, the shaft portion 22 of the step chain support device 20 is inserted into the cut lower chain end. Furthermore, using the connecting line 40, the shaft portion 22 of the step chain support device 20 installed at the upper chain end is connected to the shaft portion 22 of the step chain support device 20 installed at the lower chain end. In this state, the escalator is manually wound, causing the area of ​​the opening connected by the connecting line 40 to move until the upper chain end passes the target position.

[0082] Thus, according to the modified ladder chain support device 20 including the connecting line 40, the number of ladder chain units 10 to be disassembled can be minimized, thereby improving work efficiency.

[0083] In addition, if the connecting line 40 becomes an obstacle during maintenance work at the target location, the retaining connecting strap 50 can be used to fasten and hold the nearest step shaft 12 together, and the connecting line 40 can be removed.

[0084] 8. Other

[0085] The preferred embodiments have been described in detail above, but this disclosure is not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims.

[0086] The various methods disclosed herein are summarized below as appendices.

[0087] (Postscript 1)

[0088] A ladder chain support device is disclosed in a passenger conveyor for supporting the end of a ladder chain when a portion of the chain has been cut off. The passenger conveyor includes: the ladder chain, which is connected in a loop and moves cyclically; a plurality of ladder shafts, which are equally spaced from the ladder chain; drive rollers disposed on the ladder shafts and guided along drive tracks; and a plurality of ladders, each fixed to one of the plurality of ladder shafts.

[0089] The ladder chain is formed into a loop by connecting the ends of multiple segmented chains with ends together using connecting rods.

[0090] A pin hole is provided at the end of the chain of the segmented chain, which is used to insert the connecting pin of the connecting rod.

[0091] The ladder chain support device includes:

[0092] The shaft portion, which is inserted into the pin hole at the end of the chain when the connecting rod is removed and a portion of the ladder chain is cut off; and

[0093] A roller section, which is disposed at one end of the shaft section.

[0094] The ladder chain support device is configured such that, with the shaft portion inserted into the pin hole, the roller portion is guided along the drive track.

[0095] (Postscript 2)

[0096] According to the ladder chain support device described in Appendix 1, wherein...

[0097] At the position where the roller is guided along the drive track, the shaft has an end portion protruding from the pin hole.

[0098] (Note 3)

[0099] According to Appendix 1 or 2, the ladder chain support device, wherein...

[0100] The roller section has the same shape as the drive roller.

[0101] (Note 4)

[0102] According to any one of Appendices 1 to 3, the ladder chain support device, wherein...

[0103] The ladder chain support device also includes a connecting line that connects the upper chain end located on the upper side and the lower chain end located on the lower side of the chain ends when the connecting rod is removed and a portion of the ladder chain is cut off.

[0104] (Note 5)

[0105] According to the ladder chain support device described in Appendix 4, wherein...

[0106] The ladder chain support device also includes a retaining connecting belt, which secures and holds the ladder shaft closest to the upper chain end and the ladder shaft closest to the lower chain end.

[0107] (Note 6)

[0108] A ladder chain support method uses the ladder chain support device described in any one of Appendices 1 to 5 to support the chain end when a portion of the ladder chain has been cut off, wherein...

[0109] The ladder chain support method includes the following steps:

[0110] Disassemble the multiple ladder steps;

[0111] Release the tension of the ladder chain;

[0112] Disassemble the connecting rod to cut off a portion of the ladder chain;

[0113] The shaft of the ladder chain support device is inserted into the pin hole at the upper end of the ladder chain, and the roller is positioned on the upper surface of the drive track; and

[0114] Move the ladder chain until the end of the upper chain passes the target position.

[0115] (Note 7)

[0116] A ladder chain support method uses the ladder chain support device described in any one of Appendices 1 to 5 to support the chain end when a portion of the ladder chain has been cut off, wherein...

[0117] The ladder chain support method includes the following steps:

[0118] Disassemble the multiple ladder steps;

[0119] Release the tension of the ladder chain;

[0120] Disassemble the connecting rod to cut off a portion of the ladder chain;

[0121] The shaft portion of the ladder chain support device is inserted into the pin hole at the upper chain end and the pin hole at the lower chain end of the ladder chain, respectively, and the roller portion is disposed on the upper surface of the drive track.

[0122] Connect the upper chain end to the lower chain end using a connecting wire; and

[0123] Move the ladder chain until the end of the upper chain passes the target position.

[0124] (Note 8)

[0125] According to the ladder chain support method described in Appendix 7, wherein...

[0126] The ladder chain support method includes the following steps:

[0127] After the ladder chain is moved to the target position where the upper chain end has passed, a retaining tie is used to secure and hold the ladder shaft closest to the upper chain end to the ladder shaft closest to the lower chain end; and

[0128] Disconnect the connecting wire.

Claims

1. A ladder chain support device for supporting the end of a chain that has been cut off in a passenger conveyor, the passenger conveyor comprising: the ladder chain connected in a loop and cyclically moving; a plurality of ladder shafts equally spaced from the ladder chain; drive rollers disposed on the ladder shafts and guided along drive tracks; and a plurality of ladders respectively fixed to the plurality of ladder shafts, wherein... The ladder chain is formed into a loop by connecting the ends of multiple segmented chains with ends together using connecting rods. A pin hole is provided at the end of the chain of the segmented chain, which is used to insert the connecting pin of the connecting rod. The ladder chain support device includes: The shaft portion, which is inserted into the pin hole at the end of the chain when the connecting rod is removed and a portion of the ladder chain is cut off; and A roller section, which is disposed at one end of the shaft section. The ladder chain support device is configured such that, with the shaft portion inserted into the pin hole, the roller portion is guided along the drive track.

2. The ladder chain support device according to claim 1, wherein, At the position where the roller is guided along the drive track, the shaft has an end portion protruding from the pin hole.

3. The ladder chain support device according to claim 1 or 2, wherein, The roller section has the same shape as the drive roller.

4. The ladder chain support device according to claim 1 or 2, wherein, The ladder chain support device also includes a connecting line that connects the upper chain end located on the upper side and the lower chain end located on the lower side of the chain ends when the connecting rod is removed and a portion of the ladder chain is cut off.

5. The ladder chain support device according to claim 4, wherein, The ladder chain support device also includes a retaining connecting belt, which secures and holds the ladder shaft closest to the upper chain end and the ladder shaft closest to the lower chain end.

6. A method for supporting a ladder chain, using the ladder chain support device of claim 1 to support the end of the chain when a portion of the ladder chain has been cut off, wherein, The ladder chain support method includes the following steps: Disassemble the multiple ladder steps; Release the tension of the ladder chain; Disassemble the connecting rod to cut off a portion of the ladder chain; The shaft of the ladder chain support device is inserted into the pin hole at the upper end of the ladder chain, and the roller is positioned on the upper surface of the drive track; and Move the ladder chain until the end of the upper chain passes the target position.

7. A method for supporting a ladder chain, using the ladder chain support device of claim 1 to support the end of the chain when a portion of the ladder chain has been cut off, wherein... The ladder chain support method includes the following steps: Disassemble the multiple ladder steps; Release the tension of the ladder chain; Disassemble the connecting rod to cut off a portion of the ladder chain; The shaft portion of the ladder chain support device is inserted into the pin hole at the upper chain end and the pin hole at the lower chain end of the ladder chain, respectively, and the roller portion is disposed on the upper surface of the drive track. Use connecting wires to connect the upper chain end to the lower chain end; as well as Move the ladder chain until the end of the upper chain passes the target position.

8. The ladder chain support method according to claim 7, wherein, The ladder chain support method includes the following steps: After the ladder chain is moved to the target position where the upper chain end has passed, a retaining tie is used to secure and hold the ladder shaft closest to the upper chain end to the ladder shaft closest to the lower chain end; and Disconnect the connecting wire.

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