JP7122263B2 - hydraulic elevator - Google Patents

Description

The present invention relates to hydraulic elevators.

The hydraulic system of the hydraulic elevator is provided with an oil tank.

The oil tank has a lid covering its upper opening. The lid is detachably provided.

In Patent Document 1, for the purpose of preventing oil leakage even if shaking occurs due to an earthquake or the like, a semicircularly curved wave preventing member is detachably inserted and fixed to the edge of the periphery of the storage part. An oil tank having a configuration is disclosed.

JP-A-9-118389

In the oil tank disclosed in Patent Literature 1, since a gap remains between the wave blocking member and the oil tank, oil leakage from this gap cannot be completely prevented. In other words, when an earthquake occurs and the oil level fluctuates greatly due to the vibrations transmitted to the oil tank and reaches the upper part of the oil tank, the oil leaks from the gap between the oil tank and the wave-blocking member, and the floor surface defile the Furthermore, when a large amount of oil leaks, there is also the problem that the hydraulic system cannot be driven.

Further, in the oil tank disclosed in Patent Document 1, one side of the breakwater member is fixed with an adhesive. For this reason, there is room for improvement in that there is a risk that the breakwater member may come off due to deterioration of the adhesive over time. Furthermore, since the application of the adhesive takes time, there is room for improvement from the viewpoint of workability.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to reduce leakage from the upper portion of an oil tank in a hydraulic elevator even when hydraulic oil in the oil tank shakes due to an earthquake or the like.

The present invention is a hydraulic elevator provided with a rectangular oil tank for storing hydraulic oil, the oil tank being characterized by being provided with an oil return part attached to a lid attachment part on the upper part of the longitudinal side plate of the oil tank.

Advantageous Effects of Invention According to the present invention, in a hydraulic elevator, leakage from the upper portion of the oil tank can be reduced even when hydraulic oil in the oil tank shakes due to an earthquake or the like.

2 is a partial cross-sectional view showing the overall configuration of the hydraulic system of the hydraulic elevator of Embodiment 1. FIG. FIG. 2 is a cross-sectional view showing a substantially L-shaped portion of the oil tank of FIG. 1; FIG. 2 is a top view showing the oil tank of FIG. 1; FIG. 11 is a perspective view showing a first oil leakage prevention plate of Example 2; FIG. 5 is a side view showing a state where the first oil leakage prevention plate of FIG. 4 is attached to the oil tank; FIG. 11 is a side view partially showing the oil tank of Example 3; FIG. 11 is a side view partially showing the oil tank of Example 4; FIG. 11 is a side view partially showing the oil tank of Example 5; FIG. 11 is a perspective view showing a state in which two oil leak prevention plates of Embodiment 6 are joined;

TECHNICAL FIELD The present invention relates to a device for preventing oil leakage from an oil tank of a hydraulic elevator.

Embodiments of the present invention will be described below.

The hydraulic elevator of the present invention comprises a rectangular oil tank for storing hydraulic oil.

An oil return portion is attached to the lid attachment portion on the upper portion of the longitudinal side plate of the oil tank.

The following are preferred embodiments.

The oil return portion extends inward from the upper portion of the longitudinal side plate of the oil tank. The oil return portion is produced by bending a portion of the lid attachment portion.

The oil return portion is a first oil leakage prevention plate that extends toward the inside of the oil tank from the upper portion of the longitudinal side plate of the oil tank, is fixed to the lid attachment portion with bolts, and has a bent portion.

The first oil leak prevention plate is bolted to the lower surface side of the lid mounting portion.

The bent portion of the first oil leakage prevention plate is fixed with bolts so as to be located closer to the side plate than the inner edge of the lid attachment portion.

The oil return portion is bolted to the upper surface of the lid attachment portion.

A second oil leakage prevention plate is installed on the first oil leakage prevention plate.

The second oil leak prevention plate has a through hole through which hydraulic oil can pass.

The embodiment of the present invention can also be described as follows.

A hydraulic system of a hydraulic elevator includes an oil tank that stores hydraulic oil, a driving device that generates hydraulic pressure, and a control device.

The upper opening of the oil tank has a substantially L-shaped portion bent inward. A lid is installed on the upper surface of the substantially L-shaped portion. The substantially L-shaped portion has an oil return portion which is a downwardly inclined portion.

The following are preferred embodiments.

The top opening of the oil tank is rectangular with sides of different lengths. The oil return portion is provided on the long side of the upper opening.

The oil return portion is formed by bending.

The oil return portion is fixed to the substantially L-shaped portion with bolts.

The oil return portion is fixed to the lower surface portion of the substantially L-shaped portion.

The oil return portion is formed of an oil leak prevention plate having a bent portion. A gap is formed between the bent portion and the edge of the substantially L-shaped portion.

The oil return portion is fixed to the upper surface portion of the substantially L-shaped portion.

The oil return portion is formed by two oil leak prevention plates having bent portions. A second oil leakage prevention plate is installed on the first oil leakage prevention plate of the two oil leakage prevention plates.

The second oil leak prevention plate has a through hole through which hydraulic oil can pass.

A gap is provided between the lid and the upper surface of the substantially L-shaped portion.

An oil tank for storing hydraulic oil used in a hydraulic elevator has an upper opening, the upper opening has a substantially L-shaped part bent inward, and the upper surface of the substantially L-shaped part has: A lid is provided and the generally L-shaped portion has an oil return portion which is a downwardly sloping portion.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the hydraulic system of the hydraulic elevator of this embodiment.

In this figure, the hydraulic system of the hydraulic elevator comprises an oil tank 1 , a drive system 4 and a control system 5 .

The oil tank 1 has a reservoir 2 . Hydraulic oil 3 is stored in the reservoir 2 . The hydraulic oil 3 is stored at a liquid level that leaves a space where the upper portion of the inner wall surface 21 of the oil tank 1 is in contact with air. The driving device 4 is provided below the oil tank 1 . The driving device 4 has a function of generating a desired hydraulic pressure by sending and discharging the working oil 3 in the oil tank 1 to a plunger (not shown).

An upper opening 7 of the oil tank 1 is provided with a lid 6 . The lid 6 can be opened to replace the hydraulic oil 3 or to check if the hydraulic oil 3 is dirty.

Both ends of the upper opening 7 of the oil tank 1 are bent inward into a substantially L shape. The lid 6 is placed on the upper surface of the substantially L-shaped portion and fixed with bolts 8 . The substantially L-shaped portion (substantially L-shaped portion) has an oil return portion 11 that is a portion inclined downward toward the hydraulic oil 3 of the storage portion 2 . The lower end of the oil return portion 11 is the rim 9 .

A slight gap 10 is provided between the lid 6 and the upper surface of the substantially L-shaped portion. This allows air to flow between the inside and the outside of the oil tank 1 . That is, the gap 10 is a space for venting air.

FIG. 2 is an enlarged view of the substantially L-shaped portion of the oil tank of FIG.

As shown in FIG. 2, both ends of the upper opening 7 of the oil tank 1 are formed by a first bent portion 11a and a second bent portion 11b, which are horizontal surfaces. The first bent portion 11a is a portion to which the lid 6 is fixed. The second bent portion 11b corresponds to the oil return portion 11 in FIG. The first bent portion 11a and the second bent portion 11b are formed by bending.

FIG. 3 is a top view of the oil tank 1 of this embodiment with the lid 6 removed.

In this figure, the oil tank 1 has a rectangular shape with sides of different lengths when viewed from above. It is a configuration in which a second bent portion constituting the oil return portion 11 is provided on the long side. In other words, the upper opening 7 has a rectangular shape and has an oil return portion 11 on its long side. The upper opening 7 may be square, but will normally have sides of different lengths due to the tolerance of the placement of the oil tank 1 .

According to the configuration of this embodiment, even if an earthquake occurs and the hydraulic oil 3 in the reservoir 2 shakes, the hydraulic oil 3 hits the inner wall surface 21 and rises along the inner wall surface 21, the hydraulic oil 3 , the hydraulic oil 3 is prevented from leaking to the outside of the oil tank 1 because it hits the oil return portion 11 and changes direction to return to the storage portion 2 . In addition, since the oil return portion 11 is formed by bending, there is no gap for the hydraulic oil 3 to leak out of the oil tank 1, unlike the conventional technology in which a wave preventing member is attached, and the possibility of the hydraulic oil 3 flowing out is extremely high. lower.

The oil tank 1 has a rectangular shape with sides of different lengths when viewed from above when installed, and oil leakage often occurs on the long sides rather than the short sides. Therefore, it is more important to provide a mechanism for preventing oil leakage on the long side.

If a similar oil return portion is provided on the short side, oil leakage from that portion can be prevented.

FIG. 4 is a perspective view showing the first oil leakage prevention plate of this embodiment.

A first oil leakage prevention plate 13 shown in this figure replaces the oil return portion 11 of the first embodiment.

The first oil leakage prevention plate 13 has a configuration in which a bent steel plate is provided with mounting bolt holes. Further, since the first oil leakage prevention plate 13 is attached for the purpose of reversing the hydraulic oil 3, it does not require a member strength as high as that of the oil tank 1, and can be realized with a lightweight thin steel plate.

FIG. 5 is a side view showing a state in which the first oil leak prevention plate 13 of FIG. 4 is attached to the oil tank.

As shown in FIG. 5 , the first oil leak prevention plate 13 is fixed inside the oil tank 1 on the edge 9 of the reservoir 2 using countersunk screws 131 and weld nuts 132 . The top surface of the countersunk screw 131 is planar and can be made substantially the same height as the top surface of the rim 9 . This can prevent the gap 10 in FIG. 1 from becoming large.

If the first oil leakage prevention plate 13 is attached to the upper four sides of the oil tank 1, the effect of preventing oil leakage is high. To avoid this, it may be attached only on the long side.

The first oil leakage prevention plate 13 of this embodiment has the same shape as the second bent portion 11b shown in FIG. Has an oil repelling effect.

Furthermore, if the first oil leak prevention plate 13 is made of a thin steel plate, the oil return portion can be made lighter than the oil return portion 11 of the first embodiment, which is formed by bending the oil tank 1. can. Therefore, the weight of the oil tank 1 is not increased, and workability such as installation and transportation is higher than that of the first embodiment.

In this embodiment, only points different from the second embodiment will be described.

FIG. 6 partially shows the oil tank of this embodiment.

As shown in the figure, this embodiment differs from the second embodiment in that the first oil leakage prevention plate 13 is bent below the edge 9 of the reservoir 2 of the oil tank 1. It is what I did. Thereby, a gap 133 (space) is formed between the first oil leakage prevention plate 13 and the edge 9 .

Also in this embodiment, the configurations of the first oil leakage prevention plate 13, the edge 9, and the lower surface of the inner wall surface 21 are the same as those of the first and second embodiments, and have the same oil return effect.

Furthermore, even if the hydraulic fluid 3 rising along the inner wall surface 21 reaches the gap 133, the bending position of the first oil leakage prevention plate 13 is inside the edge 9, so the hydraulic fluid 3 does not reach the edge 9. The possibility of leakage to the outside of the oil tank 1 is further reduced.

A normal nut may be used instead of the weld nut 132 to attach to the rim 9, but if the first oil leak prevention plate 13 is attached later, the weld welded to the first oil leak prevention plate 13 may be used. A nut 132 is preferably used. By using the weld nut 132, it is possible to prevent the nut from falling into the oil tank 1 containing the hydraulic oil 3.

In this embodiment, only points different from the third embodiment will be described.

FIG. 7 partially shows the oil tank of this embodiment.

In this figure, the first oil leakage prevention plate 13 is attached to the upper surface of the rim 9 of the oil tank 1 .

Also in this embodiment, the configurations of the first oil leakage prevention plate 13, the edge 9, and the lower surface of the inner wall surface 21 are the same as those of the first to third embodiments, and have the same oil return effect.

The hydraulic oil 3 rising along the inner wall surface 21 moves from the inner wall surface 21 toward the first oil leakage prevention plate 13 . However, since the gap formed between the first oil leakage prevention plate 13 and the edge 9 is minute, the possibility of the hydraulic oil 3 leaking out of the oil tank 1 through this gap is low.

In addition, since the first oil leakage prevention plate 13 is attached to the upper surface of the edge 9, it is easier to attach than the second and third embodiments that attach it inside, and the first oil leakage prevention plate may be accidentally attached during installation. It is possible to reduce the possibility of an operation error such as dropping 13. Furthermore, it is possible to prevent damage to the reservoir 2 due to the fall of the first oil leakage prevention plate 13 .

In this embodiment, only points different from the second embodiment will be described.

FIG. 8 partially shows the oil tank of this embodiment.

In this figure, the oil tank 1 has a structure in which a second oil leakage prevention plate 14 is further attached to the first oil leakage prevention plate 13 of the second embodiment (FIG. 5).

The second oil leakage prevention plate 14 is a steel plate bent in the same manner as the first oil leakage prevention plate 13, and is fixed to the lower surface of the first oil leakage prevention plate 13 with countersunk screws 131 and weld nuts 132. It is

This embodiment also has an oil return effect similar to that of the second embodiment. Furthermore, the hydraulic oil 3 rising along the inner wall surface 21 hits the second oil leakage prevention plate 14, and the momentum of the hydraulic oil 3 is reduced, so that the possibility of oil splashing when falling on the oil surface is reduced. do. In addition, since the hydraulic oil 3 is directed toward the inner wall surface 21 by the second oil leakage prevention plate 14, there is a possibility of oil leakage due to oil splashing from the gap 10 (FIG. 1) between the lid 6 and the edge 9. becomes lower.

It should be noted that the mounting of the second oil leakage prevention plate 14 is not limited to the form of the second embodiment as long as it is an oil return portion that extends toward the inside of the oil tank.

If the second oil leakage prevention plate 14 is integrally formed with the first oil leakage prevention plate 13, it will be easy to attach. In this case, the portion corresponding to the second oil leakage prevention plate 14 may be provided at a position where the nut corresponding to the countersunk screw 131 does not interfere, or a weld nut may be used.

In this embodiment, only points different from the fifth embodiment will be described.

FIG. 9 is a perspective view showing a state in which two oil leak prevention plates of this embodiment are joined together.

In this figure, a second oil leakage prevention plate 15 is attached to the first oil leakage prevention plate 13 . The second oil leakage prevention plate 15 has a configuration in which a through hole 16 through which hydraulic oil can pass is provided in the second oil leakage prevention plate 14 of FIG. The second oil leakage prevention plate 15 is fixed to the first oil leakage prevention plate 13 with countersunk screws 131 and weld nuts 132 as in the fifth embodiment.

As in the fifth embodiment, it may be formed integrally with the first oil leakage prevention plate 13 .

This embodiment also has the same oil return effect and oil splash prevention effect as the fifth embodiment.

Furthermore, when the hydraulic oil 3 with very strong force rises along the inner wall surface 21, a part of the hydraulic oil 3 passes through the through hole 16. And the load applied to the second oil leakage prevention plate 15 is reduced. As a result, it is possible to prevent the first oil leakage prevention plate 13 and the second oil leakage prevention plate 15 from coming off and the deformation of the oil tank 1 .

In addition, since the load applied to the first oil leakage prevention plate 13 and the second oil leakage prevention plate 15 can be reduced, the size of the mounting bolts can be reduced and the weight can be reduced as compared with the fifth embodiment. Therefore, this embodiment has higher workability such as attachment and transportation than the fifth embodiment.

1: oil tank, 2: reservoir, 3: hydraulic oil, 4: drive device, 5: control device, 6: lid, 7: upper opening, 8: bolt, 9: rim, 10: gap, 11: oil Returned portion 11a: first bent portion 11b: second bent portion 13: first oil leakage prevention plate 14, 15: second oil leakage prevention plate 16: through hole 21: inner wall surface 131 : Countersunk screw, 132: Weld nut, 133: Gap.

Claims (5)

In a hydraulic elevator with a rectangular oil tank for storing hydraulic oil,
Equipped with an oil return part attached to the lid attachment part on the upper longitudinal side plate of the oil tank,
The oil return portion is a first oil leakage prevention plate that extends toward the inside of the oil tank from the upper portion of the longitudinal side plate of the oil tank, is fixed to the lid attachment portion with a bolt, and has a bent portion;
A hydraulic elevator according to claim 1, wherein the first oil leakage prevention plate is fixed to the lower surface side of the lid attachment portion with bolts. Hydraulic elevator according to claim 1,
The hydraulic elevator according to claim 1, wherein the bent portion of the first oil leakage prevention plate is fixed with a bolt so as to be located closer to the side plate than the inner edge of the lid attachment portion. Hydraulic elevator according to claim 1,
A hydraulic elevator, wherein the oil return portion is fixed to the upper surface of the lid attachment portion with a bolt. Hydraulic elevator according to claim 1,
A hydraulic elevator characterized by comprising a second oil leakage prevention plate installed on the first oil leakage prevention plate. A hydraulic elevator according to claim 4 ,
The hydraulic elevator, wherein the second oil leakage prevention plate has a through hole through which the hydraulic oil can pass.

Images