JPS5827403B2 - How to assemble a long hydraulic cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for assembling a long hydraulic cylinder used in a hydraulic elevator or the like.

The hydraulic cylinders used in the above-mentioned hydraulic elevators are extremely long due to the nature of raising and lowering the elevator cage supported by the hydraulic cylinders across multiple floors. In consideration of transporting it into the elevator space, the hydraulic cylinder is divided into an appropriate number of parts during factory manufacturing, and the length is shortened into a number of divided hydraulic cylinder members, and each of these parts is individually packed and transported. These divided hydraulic cylinder members are interconnected and assembled within the elevator space.

To assemble this hydraulic cylinder, it is sufficient to connect the upper and lower cylinder tube members and the plunger members to each other, but in the conventional method, especially when connecting the plunger members, the lower plunger is installed upright on a surface. The upper plunger member, which is suspended by a chain block, is gradually lowered relative to the member, and the upper plunger member is screwed to the lower plunger member. When lowering the lower plunger member, due to a miscalculation of the lowering speed or due to the damping phenomenon during the lowering, a large impact is applied to the joint threads of both plunger members when they are in contact with each other. There was a risk that the threaded portion for the joint would be damaged and it would be impossible to screw them together if left as is.

For this reason, in the past, extremely precise operations had to be performed over a long period of time to connect these two plunger members at the installation site, requiring extremely skilled techniques and a long assembly time.

When connecting hydraulic cylinder members that have been separated in advance, the present invention suppresses the occurrence of the above-mentioned impact with a simple operation, thereby making it possible to connect both plunger members without inducing damage to the plunger member joint threaded portion. The present invention provides a method.

The structure of the present invention is such that when assembling a hydraulic cylinder that has been divided into a plurality of hydraulic cylinder members in advance by connecting these divided hydraulic cylinder members up and down, the lower end of the plunger member of the upper hydraulic cylinder member and the lower end of the lower hydraulic cylinder The upper end of the plunger member of the member is provided with a coupling screw portion that is screwed together with the upper end of the plunger member, and the lower hydraulic cylinder member is grounded and stands upright, and the upper hydraulic cylinder member is lifted to a position above it, and the upper and lower hydraulic cylinders are connected to each other. After centering the members so that the end faces of both plunger members are concentric with each other, the upper hydraulic cylinder member is rotated and lowered in the above-mentioned screw connection direction, and the upper plunger member is screwed into the lower plunger member. and then coaxially connect the upper cylinder tube member to the lower cylinder tube member.

Further, in the above-mentioned configuration of the present invention, the upper hydraulic cylinder member is provided with a rotation operation means on its plunger member, and a suspension rod having the same thread pitch interval as the joint threaded portion is screwed and fixed to the upper end of the plunger member. The plunger member is lowered relative to the suspension rod by rotating the plunger member using the rotating operation means while maintaining the suspension rod in an immovable state.

Furthermore, after the upper-stage plunger member and the lower-stage plunger member are screwed together, the upper-stage cylinder tube member is lowered relative to the lower-stage cylinder tube member to fit them together, and then the throttle fitting portion is closed. This involves welding to connect the two together.

Hereinafter, one embodiment of the present invention will be described based on the drawings. When a hydraulic cylinder is manufactured in a factory, the present invention starts from a state in which the plunger is housed in the cylinder tube in the most contracted position, The cylinder is shown in Figure 1 a, b.

As shown in FIG.
Divide into individual cylinder tube members 2a, 2b, 2C
From the plunger member 3a.

3b and 3c, the upper cylinder tube member 2a, the upper plunger member 3as, the middle cylinder tube member 2b and the middle plunger member 3b, and the lower cylinder tube member 2C and the lower cylinder tube member 3c are packaged together, and In each hydraulic cylinder member 1a, lb, 1c, cylinder tube member 2a
~2C and the plunger members 3a to 3c, a vaporizable rust preventive agent 4 is sealed between the plunger members 3a to 3c, and the individual plunger members 3a to 3
In addition to rust-proofing the outer surface of c, the plunger members 3a~
3C to cylinder tube members 2a to 2, respectively.
The outer surfaces of the plunger members 3a to 3C are protected from damage caused by direct action of external force or impact on the plunger members 3a to 3C.

That is, in the upper hydraulic cylinder member 1a, the upper end of the upper plunger member 3a is integral with the plunger member 3a, with the upper plunger member 3a coaxially installed in the upper cylinder tube member 2a, as shown in FIG. 1a. It is closed by a certain sealing cap 5, and a sealing plate 7 integrally having an operation bundle 6 is attached to the outer end surface of this sealing cap 5, and the sealing cap 5 and the sealing plate 7 are fixed together with a cap bolt 8. be done.

A mouth sleeve 9 fitted over the upper plunger member 3a is placed on the lower side of the sealing plate 7, and between the mouth sleeve 9 and the upper cylinder tube member 2a there is a gasket 10a and a ring 10b for pressing it. The upper cylinder tube member 2a, the mouth sleeve 9, and the sealing plate 7 are integrally fastened with the stud bolts 11 and nuts 12 with the gland packing 10 interposed between the upper cylinder tube member 2a and the sealing plate 7. The upper end with the upper plunger member 3a is hermetically sealed.

Further, a male threaded joint part 13 is formed at the lower end of the upper-stage plunger member 3a to control the connection with the middle-stage plunger member 3b, and on the other hand, at the lower end of the upper-stage cylinder tube member 2a, it is connected to the middle-stage cylinder tube member 2b. A joint cover opening 14 is formed to control the above-mentioned joint male threaded portion 1.
3 and a restraining sleeve 16 interposed between the nut 15 and the lid opening 14, the upper cylinder tube member 2a and the upper plunger member 3 are
A is hermetically sealed between the lower ends of the upper cylinder tube member 2a and the upper plunger member 3a, and a vaporizable rust preventive agent is sealed in the sealed gap 4 formed between the upper cylinder tube member 2a and the upper plunger member 3a.

Further, an eye bolt 1 having a grip bundle 18 integrally inserted into the central screw hole 17 of the sealing cap 5 through the sealing plate 7.
9 is screwed in, and this eye bolt 19 and sealing cap 5 are screwed in.
For reasons described later, the thread pitch interval is set to be the same as the thread pitch interval of the male joint threaded portion 13 of the upper plunger member 3a to which the sealing nut 15 is screwed.

In the middle stage hydraulic cylinder member 1b, a joint socket 20 is formed at the upper end of the middle stage cylinder tube member 2b, a joint cover opening 21 is formed at the lower end, and the middle stage plunger member 3b is formed with a joint socket 20 at the upper end.
A female joint threaded portion 22 is formed at the upper end, and a male joint threaded portion 23 is formed at the lower end.

As shown in FIG. 1, with the middle plunger member 3b coaxially installed inside the middle cylinder tube member 2b, the upper end of the middle hydraulic cylinder member 1b is placed between the upper ends of the middle cylinder tube member 2b and the middle plunger member 3b. A two-stage sealing cap 24 for airtightly sealing the socket 20 is screwed onto the above-mentioned female joint threaded part 22 and a threaded part 25 enclosed in the inner circumferential surface of the socket 20.

Further, at the lower end of the middle hydraulic cylinder member 1b, there is a sealing nut 26 screwed onto the male joint threaded portion 23, and
a restraining sleeve 27 interposed between b and the lid opening 21;
As a result, the lower ends of the middle cylinder tube member 2b and the middle plunger member 3b are hermetically sealed, and the middle cylinder tube member 2b and the middle plunger member 3b are sealed airtightly.
A vaporizable rust preventive agent is sealed in the sealed gap 4 formed between the two.

34 is a leg seat fixed to the restraining sleeve 27.

In the lower hydraulic cylinder member 1c, as shown in FIG. 1C, a joint socket 28 is formed at the upper end of the lower cylinder tube member 2C, and a joint female screw part 29 is formed at the upper end of the lower plunger member 3c. is formed, and with the lower plunger member 3c coaxially installed inside the lower cylinder tube member 2C, the upper end of the lower hydraulic cylinder member 1c is airtightly sealed between the upper ends of the lower cylinder tube member 2c and the lower plunger member 3C. A two-stage sealing camp 30 is screwed onto the above-mentioned female joint threaded portion 29 and a threaded portion 31 carved into the inner circumferential surface of the socket 28, and the lower cylinder tube member 2c and the lower plunger member 3c are screwed together. A vaporizable rust preventive agent is sealed in the sealed gap 4 formed between the two.

Further, 40 is a cover plate that seals the lower end of the cylinder tube member 2c.

Note that 32° 32 shown in FIGS. 1d and 1c indicates an engaging tool used when lifting the middle hydraulic cylinder member 1b and the lower hydraulic cylinder member 1c with a chain block.

Further, reference numerals 33 and 33 shown in FIGS. 1a and 1b are respective plunger members 3a.

This is a buffer protection material wound around 3b, and functions to prevent each plunger member 3at3b from directly colliding with cylinder tube members 2a and 2b when assembling a hydraulic cylinder, which will be described later.

However, each hydraulic cylinder member 1 configured as described above
a, 1b.

1c is packed so that there is no risk of damage or scratches due to external force by wrapping an appropriate protective member around each layer of the cylinder tube member, and then transported to the site where the hydraulic cylinder is installed.

At the hydraulic cylinder installation site, the hydraulic cylinder is assembled according to the following steps.

That is, first, the sealing nut 26 of the middle stage hydraulic cylinder member 1b shown in FIG. The cylinder member 1b is lifted slightly and the sealing nut 26 is removed, and then the middle hydraulic cylinder member 1b is grounded upright on the ground surface A via the leg seat 34 as shown in FIG.

Next, the second stage sealing cap 24 of the middle stage hydraulic cylinder member 1b
, unscrew the sealing cap 24 from the middle cylinder tube member 2b, and pull out the middle plunger member 3b upwardly by the required amount with respect to the middle cylinder tube member 2b through the sealing cap 24. As shown in the figure, a fixture 35 is fitted into the extracted portion of the middle plunger member 3b.

As shown in FIG. 3, this fixing fitting 35 is composed of two split ring bodies 35a, 35a and bundle rods 35b, 35b fixed to the ring bodies 35a, 35a, respectively, and the outer circumference of the middle plunger member 3b. Opposing flange portions 35e, 350 of both ring bodies 35a, 35a wrapped around the surface
By bolting 36 the middle plunger member 3
b, and in this secured state, the fixing metal fitting 35 is brought into contact with the upper end of the middle cylinder tube member 2b, thereby preventing the middle plunger member 3b from falling and maintaining the required amount extraction posture of the middle plunger member 3b. After the fixing jig 35 is attached, the two-stage sealing cap 24 is removed from the middle plunger 3b (see FIG. 2C).

Next, with the cap bolt 8 slightly loosened in advance, the second
As shown in FIG.
The lower part of the upper stage plunger member 3a is exposed, and the upper stage hydraulic cylinder member 1a is transferred directly above the middle stage hydraulic cylinder member 1b.

Next, as shown in FIG. 2C, the upper stage hydraulic cylinder member 1a is gradually lowered and stopped at a position where the upper stage plunger member 3a and the middle stage plunger member 3b are spaced apart from each other by about 1 to 2 cm. The attitude of the hydraulic cylinder member 1a is controlled to rotate the centering of both hydraulic cylinder members 1a and 1b.

Thereafter, when the sealing plate 7 is rotated by the operation bundle 6 of the sealing plate 7 with the operator grasping the grip bundle 18 of the eyebolt 19 to prevent rotation of the eyebolt 19, the sealing plate 7 has no openings. Since the upper cylinder tube member 2a is integrally connected to the upper cylinder tube member 2a by the lower sleeve 9 and the stud bolt 11, and the sealing cap 5a which is integral with the upper plunger member 3a is integrally connected via the cap bolt 8, the sealing plate 7 The sealing cap 5, the upper cylinder tube member 2a, and the upper plunger member 3a rotate downward along the stationary eyebolt 19, and at this time, the thread pitch between the eyebolt 19, the sealing plate 7, and the sealing cap 5 is at the upper level. The male threaded part 13 for a joint of the plunger member 3a and the female threaded part 2 for a joint of the middle plunger member 3b
As the upper plunger member 3a rotates and descends as described above, the female joint threaded portion 13 of the upper plunger member 3a connects to the joint of the middle plunger member 3b. female thread part 2
2, and the upper plunger member 3a and the middle plunger member 3b are interconnected and integrated into one body as shown in FIG. 2d.

At this time, the bundle rod 35b of the fixing jig 35 is grasped to keep the middle plunger 3b stationary and to assist in guiding the male joint threaded part 13 so that it is reliably screwed into the female joint threaded part 22.

Once the upper plunger member 3a and the middle plunger member 3b are integrated, the protective material 33 and the fixing jig 35 are removed, the middle plunger member 3b is contracted into the middle cylinder tube member 2b, and the shrinkage is followed. Then, the entire upper hydraulic cylinder member 1a is lowered as shown in FIG. 2d.

Next, as shown in FIG. 2e, loosen the nut 12 tightening the stud bolt 11, lower the upper cylinder tube member 2a relative to the upper plunger member 3a and the sealing plate 7, and lower the lower part of the upper cylinder tube member 2a. The lid opening 14 is inserted into the upper socket 20 of the middle cylinder tube member 2b, and after confirming by the marking line 38 that both cylinder tube members 2a and 2b are coaxially and vertically connected, the lid opening 14 and Fillet welding is performed between the cylinder tube member 2a and the socket 20 to integrate both cylinder tube members 2a and 2b.

Thereafter, once the chain block 37 is removed from the eye bolt 19 and the eye bolt 19 is screwed into the sealing cap 5 again, the chain block 37 is hooked to the eye bolt 19, and the nut 12 is tightened to the stud bolt 11 to prevent the upper stage hydraulic pressure. Pull up the cylinder member 1a and the middle stage hydraulic cylinder 1b integrated therein again to the original position,
As shown in FIG. 2f, the restraining sleeve 27 with leg seat 34 is removed from the middle cylinder tube member 2b, and the lower hydraulic cylinder member 1C is stood upright directly above both hydraulic cylinder members ia and lb.

Then, the second stage sealing cap 30 of this lower stage hydraulic cylinder member 1C is removed, and the lower stage plunger member 3C is pulled out upwards by a slight amount, and the fixing jig 35 is secured to the lower stage plunger member 3C. According to the procedure, the middle plunger member 3b and the lower plunger member 3C are connected and integrated using the male joint threaded part 23 and the female joint threaded part 29, respectively, and the middle cylinder tube member 2b and the lower cylinder tube member 2c are connected. are connected and integrated using their respective lid ports 21 and sockets 28.

This state is shown in FIG. 2g. In this way, the upper hydraulic cylinder member 1at, the middle hydraulic cylinder member 1b, and the lower hydraulic cylinder member 1C are connected to form a long hydraulic cylinder, so the cap bolt 8, the stud bolt 11, the nut 12, and the sealing plate 7 are removed. By fixedly connecting the ring 9 and the upper cylinder tube 2a with the connecting bolt 39, a long hydraulic cylinder for an elevator or the like is installed on the surface A, as shown in the second diagram.

As described in detail above, when assembling separated hydraulic cylinder members connected vertically, the lower end of the plunger member of the upper hydraulic cylinder member and the upper end of the plunger member of the lower hydraulic cylinder member are mutually screwed together. The lower hydraulic cylinder member is grounded and stands upright, and the upper hydraulic cylinder member is lifted to a position above it, and the upper and lower hydraulic cylinder members are arranged so that the end surfaces of both plunger members are concentric with each other. After centering so that Since the side plunger members gradually descend at a speed equal to the mutual screwing speed of the joint threads, the impact when both plunger members come into contact is extremely small, and no damping phenomenon occurs, and the joint threads of both plunger members There is no possibility of damaging it.

Moreover, since the upper plunger member rotates and descends, the upper and lower plunger members are automatically screwed together and integrated, so there is an advantage that the upper and lower plunger members can be easily and quickly connected.

Furthermore, after the upper plunger member and the lower plunger member are screwed together, the upper cylinder tube member is integrally connected to the lower cylinder tube member, so by connecting both plunger members, both cylinder tube members Since the centering of the cylinder tube members is automatically performed, there is an advantage that the upper and lower cylinder tube members can be easily and quickly connected.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1a, b,
Fig. 2c is a partially cutaway front view of the separated hydraulic cylinder member, Figs. . ' a, 1 b, 1 c... Hydraulic cylinder member, 2a. 2b, 2c... Cylinder tube member, 3a. 3b, 3c... Plunger member, 7...
・Rotation operation means (sealing plate), 13, 22, 23, 29・
...Threaded part for joint, 14, 20 and 2L2B...
...Ingo fitting part (lid opening, socket), 19...
Suspension rod (eye bolt).

Claims (1)

[Claims] 1. When assembling a hydraulic cylinder that has been divided into a plurality of hydraulic cylinder members in advance by connecting these divided hydraulic cylinder members vertically, the lower end of the plunger member of the upper hydraulic cylinder member and the lower hydraulic Provided with a joint threaded portion that is screwed together with the upper end of the plunger member of the cylinder member,
After the lower hydraulic cylinder member is grounded and stands upright, the upper hydraulic cylinder member is lifted to a position above it, and the upper and lower hydraulic cylinder members are centered so that the end faces of both plunger members are concentric with each other, the upper hydraulic cylinder member is The hydraulic cylinder member is lowered while being rotated in the above-mentioned screw connection direction, the upper plunger member is screwed and fixed to the lower plunger member, and then the upper cylinder tube member is coaxially connected to the lower cylinder tube member. How to assemble a shaku hydraulic cylinder. 2. The upper hydraulic cylinder member is provided with a rotating operation means on its plunger member, and a suspension rod having the same thread pitch interval as the joint threaded portion is screwed and fixed to the upper end of the plunger member, and this suspension rod is immovable. 2. The assembly method according to claim 1, which comprises rotating the plunger member by the rotation operation means and lowering the plunger member relative to the hanging rod while maintaining the plunger member in the above-mentioned state. 3. After the upper plunger member and the lower plunger member are screwed together, the upper cylinder tube member is lowered relative to the lower cylinder tube member to fit them together, and then the fitting portion is welded. The assembly method according to claim 1 or 2, which includes integrally connecting both.