JP2002039301A - Chain replacement jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain replacement jig preventing dropping of a chain from the jig and dropping of the jig from a sprocket gear during chain replacement work. SOLUTION: The chain replacement jig 10 has a pair of chain guides 2a and 2b provided to clamp the chain 5; a bolt 8 is inserted into holes 16a and 16b provided in the tops of the pair of chain guides 2a and 2b and is fixed therein to interconnect the tops of the chain guides 2a and 2b and to adjust the clamping width of the chain guides 2a and 2b. A plate portion 9 is inserted into grooves 7a and 7b provided on the opposite surfaces of the chain guides 2a and 2b to disengage the toothed part 6 of the sprocket gear from the chain 5. A guide fixing bolt 4 is inserted into communicating holes 18a and 18b provided in the lower ends of the chain guides 2a and 2b and is brought into engagement with the toothed part 6 to fix the jig 10 to the sprocket gear.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for replacing a chain hung on a sprocket gear used as a driving means for a moving handrail for a chain for an escalator, for example. The present invention relates to a jig for replacing a chain, which can prevent the chain from falling off when the chain is replaced and can perform work in a short time.

[0002]

2. Description of the Related Art Conventionally, when only a chain is replaced by a driving device such as a moving handrail for an escalator by a combination of a sprocket gear and a chain hung thereon, the old chain is rotated while rotating the sprocket gear. Was removed and a new chain was attached.

FIG. 16 is a side view including a partial perspective view of a drive unit of a general escalator handrail. The drive device 21 is a drive device that drives the escalator body as a whole, and drives the main chain 22. The main chain 22 meshes with the main sprocket gear 23 and drives the main sprocket gear 23 to rotate. The sprocket gear 18 rotates integrally with the main sprocket gear 23 in a coaxial structure, and meshes with the sprocket gear 18 to drive the chain 5. On the other hand, the sprocket gear 24a is driven to rotate by meshing with the chain 5, and the sprocket gear 2a is rotated.
The chain 26 is driven by meshing with the chain 4a. Then, by driving the chain 26, the nylon roller 27 is rotationally driven. Further, the moving handrail 28 of the escalator is driven so as to contact the outer periphery of the roller 27. The chains 5 are connected by a chain connecting portion 29.

[0004] By driving the driving device 21, the main chain 22 is driven, whereby the main sprocket gear 23 is driven to rotate, and the sprocket gear 18 is driven to rotate in conjunction with this rotation. The rotation of the sprocket gear 18 drives the chain 5 and the rotation of the sprocket 24a.
6 is driven, and the roller 27 is rotated, whereby the moving handrail 28 is driven.

Next, the operation of replacing the escalator chain 5 as described above will be described with reference to FIGS.
The following describes an example of a jig for replacing a chain described in JP-A-9-42394.

[0008] As shown in FIGS. 8 and 9, a chain replacement jig 100 (hereinafter, referred to as “jig 100”) has an upper plate 11 and a lower plate 12 each having a U-shaped cross section joined at the back surface. Have been. The jig 100 includes a tip 11 of the upper plate 11.
a is protruded from the tip 12a of the lower plate 12 by a predetermined distance D, and the upper plate 11 and the lower plate 12 are provided with a plurality of elongated holes 13 at the same position along their respective center lines when they are overlapped.
Are formed. By connecting the upper plate 11 and the lower plate 12 with wires through the elongated holes 13,
As described above, the upper plate 11 and the lower plate 12 are joined on the back surface.

As shown in FIG. 10, the upper plate 11 and the lower plate 1
By making 2 a U-shaped cross section, the jig 100
Chain 5 and tooth portion 6 of sprocket gear 18 (FIG. 5)
Not to come off.

Referring to FIGS. 11 to 15, the jig 10 will be described.
The operation of replacing the chain 5 using 0 will be described.

The chain replacement operation is performed by three persons, an operator (not shown) that manually releases the brake and operates the driving device 21 and workers P1 and P2 that exchange the old chain 5 and the new chain 50. Will be

When the chain 5 for driving the handrail 28 of the escalator is to be replaced, the driving device 21 is stopped, and the manhole of the escalator elevating opening is opened.
The escalator is manually moved downward by moving the main chain 22 and the main sprocket gear 23 as shown in (3), and the number of steps of the escalator corresponding to the position of the connecting portion 29 is three steps above and below the connecting portion 29. Six stages are removed (S202). Next, the tension of the chain 5 is reduced to the maximum and the sprocket gear 24a having a small diameter is used.
The chain 5 is removed from the teeth (S204). afterwards,
As shown in FIGS. 11 and 12, the jig 100 is attached to the upper part of the sprocket gear 18 and inserted (S20).
6). At this time, the jig 100 is inserted between the sprocket gear 18 and the chain 5 so that the jig 10
0, the lower surface of the lower plate 12 is
Is attached so as to sandwich the tooth portion 6 from both sides,
The lower plate 12 lifts the chain 5 and moves while releasing the meshing state of the chain 5 with the teeth 6,
It progresses as shown in FIG. 13 while bending along the outer periphery of the sprocket gear 18.

Next, the chain 5 is moved while manually driving the escalator, and the connecting portion 29 is connected to the workers P1 and P2.
After moving to the position 2, the chain 5
14, the chain 5 is collected in the direction of the arrow shown in FIG. 14, and a new chain 50 is connected to the connecting portion 29.
0 is moved in the direction of the arrow, and the old and new chains 5, 50 are replaced (S208).

As shown in FIG. 13, when the jig 100 advances to about 1/4 to 1/3 of the circumference of the sprocket gear 18,
Thereafter, the meshing state with the sprocket gear 18 is released due to the weight of the chain 5. As a result, the chain 5 is completely separated from the teeth 6 of the sprocket gear 18 and can be freely and quickly moved by itself.

Then, the new chain 50 is turned around the shaft of the sprocket gear 24a, the other end of the old chain 5 is removed from the connecting portion 29, and the other end of the new chain 50 is connected to connect the new chain 50. Complete (S21
0).

[0014]

The conventional chain replacement jig shown in FIGS. 8 to 15 has only the chain 5 mounted on the U-shaped upper plate 11. Therefore, when there is tension in the chain 5 and the chain 5 presses the lower plate 12 and the tooth portion 6 of the sprocket gear 18, the tooth portion 6 and the lower plate 12 are engaged with each other, as described above. The chain 5 rests on the upper plate 11 and the engagement with the teeth 6 is smoothly released.

However, when the tension of the chain 5 is loosened, the chain 5 may fall off from the lower plate 12,
The pressing force on the lower plate 12 by the
And the jig 100 may fall off from the sprocket gear 18 during the replacement work.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to prevent a chain from falling off a jig during a replacement operation and a jig from falling off a sprocket gear. It is to provide a replacement jig.

[0017]

Means for Solving the Problems To solve the above problems, a chain replacement jig according to the present invention has the following features.

(1) A jig for replacing a chain driven by being engaged with a sprocket gear, comprising: a pair of chain guides provided so as to sandwich at least a part of the chain from a short width direction; An adjuster for connecting the upper portions of the chain guides and adjusting the clamping width of the pair of chain guides, a pair of grooves provided on the opposing surfaces of the pair of chain guides, and a gap between the sprocket gear and the chain. And a plate portion to be inserted into the pair of grooves for insertion into the groove.

Since the chain is arranged on a pair of chain guides on both sides of the chain, and the chain is held between the chain guides by the adjusting tool, the chain can be dropped from a chain replacement jig (hereinafter referred to as a "jig"). Less likely. Furthermore, since the adjusting tool is attached so as to straddle the upper part of the chain guide, for example, above the chain, the tension of the chain is loosened, and even if the chain moves upward, the chain is held down by the adjusting tool and falls off from the jig. There is no. Further, by inserting a plate between the teeth of the sprocket gear and the chain, the meshing state between the teeth and the chain can be easily released. Further, the plate portion has a simple structure and is easy to handle even in a narrow place. Further, by inserting the plate portion into the groove of the chain guide, the plate portion can be positioned, and the plate portion can be prevented from falling off the jig. As a result, the meshing between the chain and the teeth of the sprocket gear can be easily released without dropping the chain from the jig during the replacement of the chain.

(2) A jig for replacing a chain driven by meshing with a sprocket gear, wherein the jig is attached from above the chain so as to sandwich at least a part of the chain from a short width direction. A chain guide, a pair of grooves provided on each of the sandwiching opposing surfaces of the chain guide, and a plate portion inserted into the pair of grooves for insertion between the sprocket gear and the chain.

Since the chain guide having a U-shaped cross section is mounted from above the chain while sandwiching both sides of the chain, even if the tension of the chain is loosened, the chain can be replaced with a jig for replacing the chain (hereinafter referred to as a "jig"). "). Further, by inserting a plate between the teeth of the sprocket gear and the chain, the meshing state between the teeth and the chain can be easily released. Further, the plate portion has a simple structure and is easy to handle even in a narrow place. Further, by inserting the plate portion into the groove of the chain guide, the plate portion can be positioned, and the plate portion can be prevented from falling off the jig. As a result, the meshing between the chain and the teeth of the sprocket gear can be easily released without dropping the chain from the jig during the replacement of the chain.

(3) The chain replacement jig according to the above (1) or (2), further comprising a hole communicating with at least one groove of the pair of chain guides or the chain guide, and a jig inserted into the hole. And a plate fixing device for fixing the plate.

By fixing the plate portion with the plate fixing device, the tooth portion of the sprocket gear and the chain can be easily separated. Thereby, the replacement work can be performed more smoothly.

(4) The jig for replacing a chain according to (1) or (2), further comprising: a communication hole provided in each of the pair of chain guides or opposing surfaces of the chain guide; And a guide fixture for engaging the sprocket gear and fixing the pair of chain guides or the chain guide to the sprocket gear.

By fixing the chain guide to the sprocket gear with the guide fixing tool, it is possible to prevent the jig from falling off the sprocket gear during the replacement operation.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described. The same components as those of the conventional jig are denoted by the same reference numerals, and description thereof will be omitted.

First embodiment. The chain replacement jig of the first embodiment will be described with reference to FIGS.

As shown in FIGS. 1 to 3, a chain replacement jig 10 (hereinafter referred to as “jig 10”) of the first embodiment is a sprocket gear tooth for driving a moving handrail of an escalator. This is a jig for replacing the chain 5 that is driven by meshing with the portion 6. The jig 10 is provided with a pair of chain guides 2a and 2b so as to sandwich at least a part of the chain 5 from the short width direction. Holes 16a and 16b are provided on the upper portions of the pair of chain guides 2a and 2b, respectively.
The adjustment tool is inserted and fixed to 6a, 16b, the chain guides 2a, 2b are connected at the upper part, and the clamping width of the pair of chain guides 2a, 2b is adjusted. This adjuster comprises a bolt 8 and nuts 15a, 15b, 15c. The bolt 8 is inserted into holes 16a, 16b provided in the chain guides 2a, 2b, respectively.
The chain guides 2a, 2b, 5a, 15b, 15c
b, and the clamping width of the pair of chain guides 2a, 2b can be adjusted by the tightening of the bolts 8. Furthermore, a pair of chain guides 2a,
On the opposing surface of 2b, grooves 7a and 7b are provided, respectively.
The plate portion 9 is inserted into the grooves 7a and 7b so as to be inserted between the tooth portion 6 of the sprocket gear and the chain 5. This plate portion 9 is preferably a member having flexibility.

As described above, the pair of chain guides 2a,
Since the 2b is provided, the chain 5 can be prevented from falling off the jig 10 in the lateral direction. Furthermore, since the upper portions of the chain guides 2a and 2b are connected to each other and attached to the bolts 8 so as to straddle the upper part of the chain 5, even if the tension of the chain 5 is loosened and the chain 5 starts dropping upward,
The chain 5 can be held down by the bolt 8, and the chain 5 can be prevented from falling off the jig 10. Further, by inserting the plate portion 9 between the tooth portion 6 of the sprocket gear and the chain 5, the meshing state between the tooth portion 6 and the chain 5 can be released. Further, the plate portion 9 is connected to the chain guide 2a,
By inserting the plate portion 9 into the grooves 7a and 7b provided in the 2b, the plate portion 9 can be positioned and the plate portion 9 can be prevented from falling off the jig 10. With these, the chain 5 is fixed to the jig 1 during the replacement work of the chain 5.
The meshing between the chain 5 and the teeth 6 of the sprocket gear can be easily released without dropping from the zero.

Further, the jig 10 is provided with a hole 17 communicating with at least one of the grooves 7a and 7b (the groove 7a in FIG. 1) of the pair of chain guides 2a and 2b. The plate portion 9 can be fixed in the jig 10 by inserting a certain fixing bolt 3 into the hole 17. The position of the plate portion 9 can be stabilized, and the tooth portion 6 of the sprocket gear and the chain 5 can be easily separated.

Further, the jig 10 has communication holes 18a, 18b at the lower ends of the pair of chain guides 2a, 2b, respectively.
Is provided. A guide fixing bolt 4 as a guide fixing tool is inserted into the communication holes 18a and 18b, and the guide fixing bolt 4 is engaged with the tooth portion 6 of the sprocket gear, so that the pair of chain guides 2a and 2b is connected to the sprocket gear. Can be fixed. As a result, jig 1
0 is fixed to the sprocket gear, and the jig 10 can be prevented from dropping off the sprocket gear during the replacement work.

Next, the mounting operation of the jig of the present embodiment and the replacement operation of the chain using the jig of the present embodiment will be described with reference to FIGS. 4 to 6 and FIGS.

The chain replacement work is carried out by three persons: a worker who manually releases the brakes and moves the drive unit 21 (not shown), and workers P1 and P2 who replace the old chain 5 with the new chain 50. Will be

When the chain 5 for driving the handrail 28 of the escalator is to be replaced, the drive unit 21 is stopped, and the manhole of the escalator elevating opening is opened.
The escalator is manually moved downward by moving the main chain 22 and the main sprocket gear 23 as shown in (3), and the number of steps of the escalator corresponding to the position of the connecting portion 29 is three steps above and below the connecting portion 29. Remove 6 steps.

Next, relax the tension of the chain 5 to the maximum,
From the teeth of the small diameter sprocket gear 24a to the chain 5
Remove. Thereafter, as shown in FIGS. 3 and 4, the pair of chain guides 2a and 2b of the jig 10 are attached to both sides of the chain 5 and the sprocket gear 18 (S10).
2). Next, the holes 16a of the chain guides 2a, 2b
Insert the bolt 8 into the nut 16a, and insert the bolt 8 into the nut 15a.
15b, 15c, and fixed using the chain guide 2a,
2b, the clamping width of the pair of chain guides 2a, 2b is adjusted by the tightening of the bolt 8.

Next, the guide fixing bolt 4 is inserted into the communication holes 18a, 18b at the lower ends of the chain guides 2a, 2b.
By engaging the guide fixing bolt 4 with the tooth portion 6 of the sprocket gear, a pair of chain guides 2a, 2b is formed.
To the sprocket gear. As a result, the jig 10 is fixed to the sprocket gear (S104).

Subsequently, the plate 9 is inserted into the grooves 7a and 7b of the jig 10.
Is inserted, and the plate portion 9 is inserted between the tooth portion 6 of the sprocket gear and the chain 5, thereby lifting the chain 5 upward and releasing the plate portion 9 while releasing the meshing state of the chain 5 with the tooth portion 6. The plate portion 9 is moved while being moved and curved along the outer periphery of the sprocket gear 18.
Then, the plate portion 9 is fixed to the jig 10 at an arbitrary position by the fixing bolt 3 (S108).

As shown in FIG. 4, while feeding the plate portion 9,
While fixing the plurality of jigs 10 to the sprocket gear 18 in the same manner as described above, while sequentially inserting the plate portions 9 into the plurality of jigs 10,
The tooth portion 6 of the sprocket gear 18 and the chain 5 are separated.

Next, the chain 5 is moved while manually driving the escalator, and the connecting portions 29 are connected to the workers P1 and P2.
After moving to the position 2, the chain 5
14, the chain 5 is collected in the direction of the arrow shown in FIG. 14, and a new chain 50 is connected to the connecting portion 29.
0 is moved in the direction of the arrow, and the old and new chains 10, 50 are replaced (S110).

Then, the new chain 50 is turned around the shaft of the sprocket gear 24a, the other end of the old chain 5 is removed from the connecting portion 29, and the other end of the new chain 50 is connected to connect the new chain 50. Complete (S11
2).

Second embodiment. A chain replacement jig according to the second embodiment will be described with reference to FIG. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 7, the jig 30 of the present embodiment includes a pair of chain guides 2a and 2b and a bolt 8 of the jig 10 (shown in FIG. 1) of the above-described first embodiment. Instead, a chain guide 32 having a U-shaped cross section is attached from above the chain 5 so as to sandwich at least a part of the chain 5 from the short width direction.

The chain guide 32 is formed integrally with a roof member for suppressing the chain 5 from falling off and a wall member for suppressing the chain 5 from falling off in the first direction.
The mounting of the jig can be more simplified than in the embodiment. Note that the jig 30 of the present embodiment may also be used by being fixed to a plurality of sprocket gears as described above.

The operation of replacing a chain using the jig 30 of the present embodiment is performed in substantially the same manner as the operation of replacing a chain using the jig of the first embodiment.

That is, instead of the operation of S102 in FIG. 6, the tension of the chain 5 is reduced to the maximum and the chain 5 is removed from the teeth of the small-diameter sprocket gear 24a. Of the sprocket gear 18 so as to cover the chain 5 from above.
Attach to both sides of.

Next, the guide fixing bolts 4 are inserted into the communication holes 18a and 18b at the lower end of the chain guide 32, and the guide fixing bolts 4 are engaged with the teeth 6 of the sprocket gear to fix the chain guide 32 to the sprocket gear. .

Next, the plate portion 9 is inserted into the grooves 7a and 7b of the jig 30, and the plate portion 9 is inserted between the tooth portion 6 of the sprocket gear and the chain 5, thereby lifting the chain 5 upward. Then, the plate portion 9 is moved while releasing the meshing state of the chain 5 with the tooth portion 6, and the plate portion 9 is fed while being curved along the outer periphery of the sprocket gear 18. Further, the plate portion 9 is fixed to the jig 30 by the fixing bolt 3. Further, the plurality of jigs 30 are fixed to the sprocket gear 18 in the same manner as described above while the plate portion 9 is being fed.
While sequentially inserting the plate portion 9 into the sprocket gear 18
And the chain 5 are separated from each other. Then, the old chain 5 and the new chain are replaced.

[0048]

As described above, according to the jig for replacing a chain according to the present invention, the meshing state with the teeth of the sprocket gear can be easily released while preventing the chain from dropping in the upward and lateral directions. can do. Further, since the lower end of the chain guide of the jig is fixed to the sprocket gear, the jig can be stably mounted without falling off the sprocket gear. The teeth of the sprocket gear and the chain are separated from each other by a plate. The structure of the plate is simple and easy to handle even in a narrow place, and the workability is good.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a chain replacement jig according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a chain replacement jig according to the first embodiment of the present invention.

FIG. 3 is a side view illustrating a state where a plate portion is inserted into the chain replacement jig according to the first embodiment of the present invention.

FIG. 4 is a diagram showing an attached state of the chain replacement jig according to the first embodiment of the present invention.

FIG. 5 is a side view illustrating the operation of releasing the engagement between the chain and the sprocket gear using the plate portion of the chain replacement jig according to the first embodiment of the present invention.

FIG. 6 is a flowchart of a chain replacement operation using the chain replacement jig according to the first embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a configuration of a jig for replacing a chain according to a second embodiment of the present invention.

FIG. 8 is a perspective view showing a configuration of a conventional chain replacement jig.

FIG. 9 is a plan view showing a configuration of a conventional chain replacement jig.

FIG. 10 is a front view showing a configuration of a conventional chain replacement jig.

FIG. 11 is an enlarged perspective view showing a state of a chain replacement operation using a conventional chain replacement jig.

FIG. 12 is an enlarged side view showing a state of a chain replacement operation using a conventional chain replacement jig.

FIG. 13 is a side view including a partial cross-sectional view showing a state of a chain replacement operation using a conventional chain replacement jig.

FIG. 14 is a diagram illustrating a chain replacement operation.

FIG. 15 is a flowchart showing a conventional chain replacement work procedure.

FIG. 16 is a diagram illustrating an outline of a general escalator driving device.

[Explanation of symbols]

2a, 2b Chain guide, 5 chains, 6 teeth, 7a, 7b groove, 8 bolts, 9 plate, 10 Chain replacement jig, 15a, 15b, 15c nut, 1
6a, 16b, 17 holes, 18a, 18b communication holes.

Claims (4)

[Claims] 1. A jig for replacing a chain driven by being engaged with a sprocket gear, comprising: a pair of chain guides provided so as to sandwich at least a part of the chain from a short width direction; An adjuster that connects the upper portions of the chain guides and adjusts the holding width of the pair of chain guides; a pair of grooves provided on opposing surfaces of the pair of chain guides; and between the sprocket gear and the chain. And a plate part to be inserted into the pair of grooves for insertion. 2. A jig for replacing a chain driven by being engaged with a sprocket gear, the jig having a U-shaped cross section attached from above the chain so as to sandwich at least a part of the chain from a short width direction. A chain guide, a pair of grooves provided on each of the sandwiching opposing surfaces of the chain guide, and a plate portion inserted into the pair of grooves for insertion between the sprocket gear and the chain. Jig for chain replacement. 3. The chain replacement jig according to claim 1, further comprising: a hole communicating with at least one groove of the pair of chain guides or the chain guide; and a plate inserted into the hole. A jig for replacing a chain, comprising: a plate fixing device for fixing a portion. 4. The chain replacement jig according to claim 1, further comprising: a communication hole provided in each of the pair of chain guides or opposing surfaces of the chain guide; and a jig inserted into the communication hole. A chain fixing jig for engaging the sprocket gear and fixing the pair of chain guides or the chain guide to the sprocket gear.