JPH05272512A - Assembling method for fluid pressure cylinder and jig for use in assembly - Google Patents

Abstract

PURPOSE:To easily, positively and efficiently perform assembly operations when a fluid pressure cylinder is assembled by preliminarily dividing the long stroke fluid pressure cylinder into plural parts axially in the process of manufacturing it. CONSTITUTION:Respective cylinder components 21, 24 are provided with flange parts 22a, 25a for connecting the cylinder components, and an external thread 23a and an internal thread 26a are respectively formed on plunger components 23, 26 to restrict the plunger components 23, 26 so that they cannot rotate relatively in relation to the tube components 22, 25, and to coaxially arrange the cylinder components 21, 24. A tube rotating jig 30 is attached to a bolt- insertion hole 22b of the flange part 22a to rotate the cylinder component 21 to connect the plunger components 23, 26 with screws. After the jig 30 is removed and the restrictions between the tube components 22, 25 and the plunger components 23, 26 are relieved, the opposed flange parts 22a, 25a are bolted to connect the tube components 22, 25 to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fluid pressure cylinder having a long stroke, which is divided into a plurality of parts in the axial direction and is manufactured. When these are assembled at an installation site, the assembling work is easy, reliable and safe. The present invention relates to a method of assembling a fluid pressure cylinder that can be performed, and a jig for rotating a tube used in the method of assembling.

[0002]

2. Description of the Related Art Conventionally, a hydraulic elevator in which a cage is moved up and down by a hydraulic cylinder is often used.

A hydraulic cylinder for an elevator needs to have a long stroke in accordance with the height of the building, but it is generally carried to carry a large hydraulic cylinder as a unit into a building where it is installed. Since it is difficult, the hydraulic cylinder is manufactured in a state of being divided into a plurality of parts in the axial direction, and the divided parts (cylinder structure) are carried into the installation site and then assembled. The hydraulic cylinder has a plunger housed in a cylinder tube, and in a divided state, a plurality of tube constituents and the same number of plunger constituents are created.

By the way, in transporting the tube assembly and the plunger assembly, if they are separately packaged and transported, the handling time is increased and the risk of damage to each part is increased.

In order to prevent this, therefore, as shown in FIG. 5, the corresponding plunger structures 3 and 6 are housed inside the respective tube structures 2 and 5, and the cylinder structures 1 and 4 are accommodated. And these cylinder components 1,
An assembling method has been proposed in which 4 are integrally packed and transported, and they are connected at an installation site (Japanese Patent Publication No. 58-27402).

That is, in the conventional assembling method, in order to carry out this, the plunger constituents 3 and 6 are screwed by the male screw portion 3a and the female screw portion 6a provided at their ends. There is. Further, a holder 7 for temporarily temporarily fixing the tube structure 2 and the plunger structure 3 to each other so as not to rotate is attached to the upper end of the upper cylinder structure 1. This holder 7 is provided with an eyebolt 9 that allows lifting by a chain hoist 10 and the like, and an operation bar 8 used when rotating the entire cylinder structure 1 about its axis. Hereinafter, a conventional assembling method will be described.

First, the detent jig 11 is attached to the plunger assembly 6 of the cylinder assembly 4 arranged on the lower side. The anti-rotation jig 11 is provided with operation bars 13, 13 protruding outward in the radial direction at the center of the outer peripheral surface of each of the two semicircular tying rings 12, 12.

Then, the cylinder constructing body 1 is arranged right above the cylinder constructing body 4 and is brought close to a position where the screw portions 3a, 6a of the plunger constructing bodies 3, 6 start to mesh with each other.

Next, while one of the workers holds the operation bars 13 of the detent jig 11 to prevent the plunger assembly 6 from rotating, another worker operates the operation bar 8 of the holder 7. , 8 are operated to rotate the cylinder structure 1 so that the plunger structures 3 and 6 are screwed to each other.
In addition, the screw pitch of the eyebolt 9 in the holder 7,
The screw pitches of the plunger constituents 3 and 6 are the same, and the cylinder constituent 1 descends itself according to the rotation amount of the chain hoist 10 without inching the chain hoist 10 to adjust its height position. It is like this.

When the screw connection is completed, the cylinder structure 4
Remove the rotation stopper jig 11 from the plunger assembly 3
The joint between (6) and (6) is finely finished, the cylinder constructing body 1 is further lowered, the tube constructing bodies 2 and 5 are fitted to each other, and they are connected by welding.

[0011]

However, in the above-described conventional assembling method, the worker holding the rotation preventing jig 11 and the holder 7 are rotated in order to screw the plunger constituents 3 and 6 to each other. A minimum of two workers were required, including the workers to let it work.

Further, since the worker who rotates the holder 7 performs the work at a position higher than the cylinder structure 1, the screw members 3a and 6a of the plunger structures 3 and 6 are directly connected to each other. It is not possible to proceed with the work while checking it with one's own eyes, and it becomes a collaborative work with other workers. Therefore, work efficiency is inevitably lowered, and moreover, damage accidents such as breakage of screw threads are likely to occur. Furthermore, it is necessary to install a high scaffolding for workers, which increases the risk of the workers themselves falling.

Although not shown in the drawings, a rail member for guiding the raising and lowering of the cage is provided so as to project from the inner wall surface of the elevator ascending / descending path, which is an installation space for the elevator, and the holder 7 is provided. When attempting to rotate the operation bar 8, the operation bar 8 may hit the rail member or the inner wall surface. In that case, the cylinder structure 4
, It is necessary to assemble the hydraulic cylinder with it temporarily placed in the center position of the hoistway, and move it to a predetermined position (close to the inner wall surface, etc.) after the assembly is completed, but such extra work requires a lot of labor. I needed it.

If the hydraulic cylinder is too long, it may not be possible to take even such a measure. In that case, a jig similar to the above-described rotation stopping jig 11 may be attached to the plunger assembly 3. It will be rotated. However, even in such a case, the situation where the operation bar hits the rail member or the like is the same, and in the end, the operation of slightly rotating the cylinder structure 1 to shift the attachment position of the jig must be repeated many times. Not only is the work extremely troublesome, but there is a strong possibility that the jig will damage the surface of the plunger structure 3.

In view of the above problems, it is an object of the present invention to enable easy, reliable and safe operation when assembling a plurality of divided cylinder structures at an installation site or the like. ..

The invention according to claim 2 provides a jig for tube rotation, which can be used for carrying out the method of the present invention regardless of the pitch of the bolt insertion holes provided in the flange portion. The purpose is to

[0017]

In order to solve the above-mentioned problems, a method according to the invention of claim 1 (hereinafter referred to as the method of the present invention) is provided with a plurality of bolts at the outer peripheral end of each tube structure. A flange for connection having an insertion hole is provided, and an internal thread portion or a male thread portion which can be screw-coupled to each other is formed at the end of each plunger structure. The plunger structure is constrained to be relatively non-rotatable, and the two cylinder structures are coaxially arranged so that the female screw side end and the male screw side end of each plunger structure face each other. With respect to the cylinder structure, a tube rotation jig is attached to the bolt insertion hole of the flange portion of the tube structure, and the cylinder rotation body is rotated by the tube rotation jig.
While screwing the individual plunger constructions together, removing the tube rotation jig from the cylinder construction,
If necessary, the constraint between the tube structure and the plunger structure in each cylinder structure is released, and the opposite flange portions are bolted to connect the two tube structures.

A jig for rotating a tube according to a second aspect of the present invention has an operation lever portion and a wrench portion provided at a tip end portion of the operation lever portion, and the wrench portion has the tube structure body. Is provided with a pin-shaped member fitted into one bolt insertion hole provided in the flange portion, and a pressing piece that abuts the outer peripheral surface of the flange portion. An engaging claw that engages with the lower surface is provided and configured.

[0019]

The tube structure which is the object of the method of the present invention is one in which a flange for connection is provided at the outer peripheral surface end on the same side as the female screw part and the male screw part formed in the plunger structure. The flange portion is provided with a plurality of bolt insertion holes. A jig for rotating the tube can be easily attached to the flange portion by using the bolt insertion hole, and can be easily removed.

Therefore, at a position close to each screw portion of the upper and lower plunger constituents by one worker, the coupling state is directly visually confirmed, and the cylinder construction is made by the tube rotating jig. The task of rotating the body and most other tasks are performed.

In the tube rotating jig, the pin member is inserted into the bolt insertion hole of the flange portion, and the pressing piece is brought into contact with the front side portion in the rotational direction of the outer peripheral surface of the flange portion. It is to rotate the structure. In this way, the tube rotating jig is attached by simply hooking it on the flange portion.
Then, when the operation of rotating the cylinder structure is performed, the engagement claw provided at the tip end portion of the pressing piece engages with the lower surface of the flange portion to prevent the tube turning bar from falling off.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a half section showing a state in which two cylinder structures 21 and 24 are connected by carrying out the method of the present invention. FIG. 2 shows a tube turning bar 30 used in the method of the present invention. 1 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BCDE of FIG. 2 showing a tube turning bar 30 used in the method of the present invention.

As shown in FIG. 1, the hydraulic cylinder CL is divided into two in the axial direction to form two cylinder components 21, 24. The cylinder components 21 and 24 are respectively
Plunger structure 23 in tube structure 22, 25,
26 are provided, and they are assembled by connecting them.

The cylinder structure 21 arranged on the upper side has a connecting flange 22a at the lower end of the outer peripheral surface of the tube structure 22. Similarly, the cylinder structure 24 arranged on the lower side also has a flange 25 for connection on the upper end of the outer peripheral surface of the tube structure 25.
a is provided. Each of these flange portions 22a, 25
Plural bolt insertion holes 22b and 25b are provided in a at positions having an equal interval along the circumferential direction.

At the upper end of the upper cylinder structure 21,
A holder 27 for temporarily fixing the tube structure 22 and the plunger structure 23 so as not to rotate with respect to each other and to move in the axial direction is attached. Holder 2
The structure of 7 is almost the same as that of the conventional holder 7 described with reference to FIG.
The two operation bars 8 provided in the are removed.

The other structures of the cylinder structures 21 and 24 are almost the same as those of the conventional cylinder structures 1 and 4 described in FIG. That is, the plunger structure 2
3 and 26 are provided with a male screw portion 23a and a female screw portion 26a for screw-joining each other, and an eyebolt 9 is screwed into the center portion of the holder 27. The screw pitch of the eyebolt 9 and the plunger constructing bodies 23, 26. Male screw part 23a
And the screw pitch of the female screw portion 26a is matched.

Now, in the cylinder structure 21 on the upper side,
The tube turning bar 30 is attached to the flange portion 22a. As shown in FIG. 2, the tube turning bar 30 is formed by the operation lever portion 31 and the wrench portion 32 provided at the tip thereof so as to have a T-shape in plan view. A pin-shaped member 33 is attached to the center of the wrench portion 32 near the tip, and pressing pieces 34, 34 are attached to the left and right evenly-distributing positions diagonally behind the pin-shaped member 33.

As shown in FIG. 3, the pin-shaped member 33 has a male screw provided on the upper end thereof and has a wrench portion 3.
It is attached by being screwed into a female screw provided in 2. The pin-shaped member 33 is formed so that its diameter is slightly smaller than the inner diameter of the bolt insertion hole 22b so that it can be easily inserted into the bolt insertion hole 22b.

The inner diameter of the bolt insertion hole 22b may vary depending on the length or inner diameter of the tube structure 22. Therefore, in order to allow the tube turning bar 30 to be commonly used for these various tube structures 22, the diameter of the pin-shaped member 33 is formed to be slightly smaller than that of the bolt insertion hole 22b having the smallest inner diameter. It's good to leave. In addition, the length of the pin-shaped member 33 is formed to be longer than the wall thickness dimension of the flange portion 22a in order to stabilize the attachment state of the tube turning bar 30 and make it difficult to drop off.

The above-mentioned pressing piece 34 has the flange portion 2 when the pin-shaped member 33 is fitted into the bolt insertion hole 22b.
The outer peripheral surface of 2a comes into contact with a portion on the front side in the rotation direction (direction of arrow X in FIG. 2).

An engaging claw 35 is provided at the tip of the pressing piece 34, and when the pressing piece 34 contacts the outer peripheral surface of the flange portion 22a, the engaging claw 35 is attached to the lower surface of the flange portion 22a. The flange portion 22a is engaged with the wrench portion 32 and the engaging claw 35 to sandwich the flange portion 22a in the thickness direction. This prevents the pin-shaped member 33 from dropping from the bolt insertion hole 22b and the tube turning bar 30 from dropping.
Safety in the lower working area is achieved.

As indicated by the chain double-dashed line in FIG. 2, when the tube turning bar 30 is straightened along the radial direction of the tube structure 22, both pressing pieces 34, 34 are pressed.
Are arranged so as to be separated from the flange portion 22a including the engaging claws 35, 35.

The tube turning bar 30 as described above may be one in which only one pressing piece 34 is provided, or two bolt holes for attaching the pressing piece 34 are provided. Alternatively, one pressing piece 34 may be replaced according to the rotation direction of the tube structure 22.

Next, the procedure for assembling the hydraulic cylinder CL will be described with reference to FIG. First, in the elevator passage (not shown) that will be the installation space for the elevator,
The lower cylinder structure 24 is arranged at the planned installation position (the position may be close to the inner wall surface).
If necessary, you can fix it at this point. Then, the plunger structure 26 of the cylinder structure 24
Then, the detent jig 11 is attached.

Then, by the chain hoist 10,
Immediately above the cylinder structure 24, the upper cylinder structure 2
1 is hoisted so that the male screw portion 23a and the female screw portion 26a of each of the plunger constituents 23, 26 are arranged coaxially with each other, and at the same time, they are brought close to a position where they start to mesh with each other. At this point, one or two tube turning bars 30 are attached to the flange portion 22a of the tube structure 22.

Next, while the operator holds the operation bar 13 of the detent jig 11 to prevent the cylinder structure 24 from rotating, the tube rotating bar 30 is used to rotate the cylinder structure 21. Two plunger components 23, 26
Are screwed together. The screw connection between the eyebolt 9 and the holder 27 progresses as the screw connection between the male screw portion 23a and the female screw portion 26a progresses, whereby the cylinder structure 21 descends by itself.

When the screw connection of the two plunger constituents 23 and 26 is completed, the rotation stopping jig 11 is removed from the plunger constituents 26, the joint between the two is finished neatly, and the tube constituent is rotated from the cylinder constituent 21. After removing the bar 30, the bolts of the holder 27 are loosened to lower the tube forming body 22 and the flange portions 22a and 25a of the two tube forming bodies 22 and 25 are brought into contact with each other, and the bolt insertion holes 22b, The bolt is inserted into 25b and fastened.

According to the above-described embodiment, when the plunger constituents 23 and 26 are screwed to each other, the tube turning bar 30 can be rotated at a position close to the male screw portion 23a and the female screw portion 26a. It is possible for one worker to rotate the cylinder structure 21 and hold the cylinder structure 24,
Most of the assembling work of the hydraulic cylinder CL can be performed by one worker.

At this time, the worker who rotates the tube turning bar 30 can proceed with the work while directly checking the connection state of the male screw portion 23a and the female screw portion 26a with his / her own eyes, thus improving the working efficiency. Less likely to cause damage accidents.

Further, since the working position can be lowered by at least the length close to the cylinder structure 21, a scaffold for workers is unnecessary or low, and work for installing and removing the scaffold, scaffolding. The work space is prevented from being narrowed due to the presence, and the safety of workers can be improved.

If the operation lever portion 31 of the tube turning bar 30 collides with the rail member or the inner wall surface in the cage ascending / descending passage, the tube turning bar 30 is once removed from the flange portion 22a, and another suitable structure is used. It can be easily reattached to the bolt insertion hole 22b at the position, and the work of rotating the cylinder structure 21 is easy. Therefore, it is not necessary to perform the extra work of moving the positions of the cylinder components 21 and 24 for assembling the hydraulic cylinder CL as in the conventional case.

Further, according to the tube turning bar 30,
There is no risk of damaging the surfaces of the plunger constituents 23 and 36, and the engagement claws 35 prevent the plunger constituents from falling. Even if the pitch of the bolt insertion holes 22b provided in the flange portion 22a is any, one type of tube turning bar 30 can be used, and the bolts can be rotated in both directions.

In the above-mentioned embodiment, the structure of the tube turning bar 30 can be variously changed. For example, in FIG.
Like the tube turning bar 40 shown in FIG. 2, it is provided without a pin-shaped member, and in actual use, the two through holes 43, 43 provided in the wrench portion 42 have bolts or other pin-shaped members. The members are attached, and these pin-shaped members are attached to two adjacent bolt insertion holes 22 of the flange portion 22a.
You may make it insert in b and 22b.

In the above-described embodiment, the cylinder structure 21 is rotated by inserting the tube turning bar into the bolt insertion hole 22b of the flange portion 22a. However, a plurality of radial holes are formed on the outer peripheral surface of the flange portion 22a. May be provided, and a bolt or other pin-shaped member may be inserted into the hole for rotation. By doing so, the cylinder structure 21 can be rotated only by a simple rod material such as a bolt.

In the above embodiment, the hydraulic cylinder C
The case where L is divided into two cylinder structures 21 and 24 has been described, but even when divided into three or more, the respective cylinders can be connected in the same manner as described above to assemble the hydraulic cylinder CL. .. The structure of the cylinder components 21 and 24 can be variously modified.

[0046]

According to the present invention, when a plurality of divided cylinder structures are assembled at an installation site or the like, the work can be performed easily, reliably and safely.

According to the second aspect of the present invention, in carrying out the method of the present invention, one kind of tube rotating jig can be used regardless of the pitch of the bolt insertion holes provided in the flange portion. In addition to being able to cope with this, the engaging claws prevent the fall, so that the safety of the work area therebelow is achieved.

[Brief description of drawings]

FIG. 1 is a front view of a half section showing a state in which two cylinder structures are connected by carrying out the method of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 showing a tube turning bar used in the method of the present invention.

FIG. 3 is a sectional view taken along the line B-C-D-E of FIG. 2, showing a tube turning bar used in the method of the present invention.

FIG. 4 is a plan view partially showing another embodiment of the tube turning bar used in the method of the present invention.

FIG. 5 is a front view in half section showing a state in which two cylinder structures are connected by a conventional method.

[Explanation of symbols]

 CL Hydraulic cylinder (fluid pressure cylinder) 21 Cylinder structure 22 Tube structure 22a Flange part 22b Bolt insertion hole 23 Plunger structure 23a Male screw part 24 Cylinder structure 25 Tube structure 25a Flange part 25b Bolt insertion hole 26 Plunger structure 26a Female screw part 30 Tube turning bar (jig) 31 Operating lever part 32 Wrench part 33 Pin-shaped member 34 Pressing piece 35 Engaging claw

Claims (2)

[Claims] 1. A fluid pressure cylinder having a plunger housed in a cylinder tube is divided into a plurality of parts in the axial direction, and each divided part is made into a cylinder structure having a plunger structure inside the tube structure. In a method of assembling a fluid pressure cylinder by connecting each cylinder structure as needed, a flange for connection having a plurality of bolt insertion holes is provided at an outer peripheral surface end of each tube structure, and each plunger structure is A female screw portion or a male screw portion that can be screwed to each other is formed at the end of each of the cylinder constituent members, and the plunger constituent member is constrained so that the plunger constituent member cannot rotate relative to the tube constituent member. Are arranged coaxially so that the female screw side end and the male screw side end of each plunger assembly face each other, and at least one cylinder assembly , A tube rotation jig is attached to the bolt insertion hole of the flange portion of the tube structure, and the cylinder structure is rotated by the tube rotation jig to screw the two plunger structures together to form a cylinder structure. Remove the jig for rotating the tube from the body, release the constraint between the tube structure and the plunger structure in each cylinder structure if necessary, and fasten the opposing flange parts with bolts to form two tube structures. A method for assembling a fluid pressure cylinder, characterized in that they are connected to each other. 2. A tube rotating jig used in the method for assembling a fluid pressure cylinder according to claim 1, comprising an operating lever portion and a wrench portion provided at a tip end portion of the operating lever portion. The wrench portion is provided with a pin-shaped member that fits into one bolt insertion hole provided in the flange portion of the tube structure, and a pressing piece that abuts the outer peripheral surface of the flange portion, A jig, wherein an engaging claw that engages with a lower surface of the flange portion is provided at a tip end portion of the pressing piece.