JP3338675B2 - Hydraulic elevator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator, and more particularly to a hydraulic elevator using a hydraulic cylinder.

[0002]

2. Description of the Related Art As a conventional hydraulic elevator, as shown in FIG. 4, a cylinder tube 3 of a hydraulic cylinder 2 is fixed to a frame 1 and a pulley (sheave) 5 is attached to a tip of a rod 4 of the hydraulic cylinder 2. An elevator guide 7 guides the elevator cage 6 so as to be slidable in the vertical direction, a wire rope 8 is hung on the pulley 5, a base 3a of the cylinder tube 3 is connected to one end of the wire rope 8, and a basket 6 is connected to the other end. Linked ones are known (for example,
177179). By driving the hydraulic cylinder 2 and moving the rod 4 with respect to the cylinder tube 3, the pulley 5 moves up and down, and the basket 6 connected to one end of the wire rope 8 moves up and down as the pulley 5 moves up and down.

The hydraulic power unit that drives the hydraulic cylinder 2 includes a hydraulic valve that adjusts oil sent to the hydraulic cylinder, a hydraulic pump that supplies oil to the hydraulic cylinder, an electric motor that drives the hydraulic pump, a tank that stores oil, and the like. (For example, see Japanese Patent Application Laid-Open No. 5-70045). These hydraulic power units are housed in a separately provided machine room and connected to hydraulic cylinders via piping (see, for example, Japanese Utility Model Laid-Open No. 60-177179).
Japanese Patent Application Laid-Open No. Sho 62-280180 discloses an invention in which a machine room is provided below an elevator space so that a new plane space for a machine room for a hydraulic power unit is not required in addition to the elevator space. ing.

According to these hydraulic elevators, since all loads can be supported on the floor, there is no need to use the side as a structure. For example, an elevator suitable for an independent tower whose side is covered with glass is provided. can get.

[0005]

However, in the conventional hydraulic elevator, the rod 4 of the elevator is placed under the condition that the entire weight of the elevator cage 6 is applied to the rod of the hydraulic cylinder.
When the rod 4 is pushed up, the rod 4 is subjected to a compression load twice as large as the rope load. For this reason, it is necessary to use the hydraulic cylinder 2 having a large capacity, and the hydraulic pump and the electric motor also have large capacities, and inevitably require a large amount of energy to operate the elevator. Also, as the cross-sectional area of the hydraulic cylinder increases, the oil flow rate increases, a large-capacity oil tank is required, and the capacity of the hydraulic pump and the electric motor increases. , It gets bigger.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hydraulic elevator capable of reducing energy consumption when ascending and descending the elevator. Another object of the present invention is to provide a compact hydraulic elevator in which the installation space for the hydraulic power unit is reduced.

[0007]

Hereinafter, the present invention will be described. In order to solve the above problems, the present inventor fixed a rod of a hydraulic cylinder, moved a cylinder tube with respect to the rod, balanced the weight of the cylinder tube and the weight of the basket, and lifted and lowered the basket. The load on the hydraulic cylinder has been reduced. That is, the hydraulic cylinder
And fix the cylinder tube to the rod.
And move to the cylinder tube via a connecting means.
In a hydraulic elevator for raising and lowering a connected basket,
A rod penetrates the cylinder tube and the rod
A piston is provided in the cylinder tube and the hydraulic system
The hydraulic power unit that drives the cylinder is
Attached to the tube.

[0008] According to the invention, the cylinder tube serves as a balance unit, the load of the hydraulic cylinder da necessary for lifting the basket is reduced by the weight of the cylinder tube. Therefore, the hydraulic pump and electric motor are downsized,
Energy consumption when raising and lowering the elevator can be reduced. For example, the load on the hydraulic cylinder can be reduced to about ４ of that of the related art. When the load on the hydraulic cylinder is reduced to about 1/4, the cross-sectional area of the cylinder becomes 1
/ 2, and the cylinder tube becomes compact. Also, by reducing the size of the hydraulic pump and the electric motor, the installation space for the hydraulic power unit is reduced. Here, the connecting means connects the cylinder tube and the basket, and for example, a wire, a rope, a chain, or the like can be used as the connecting means. In FIG.
In a conventional hydraulic cylinder as shown, the rod is
When the cylinder tube moves down and rises,
The volume of the rod that occupies the inside differs
The amount of oil to be charged into the tank differs. Therefore, this oil
An oil tank is needed to absorb the difference in filling. In the present invention
According to said, said rod penetrates said cylinder tube,
Providing the piston of the rod in the cylinder tube
The cylinder tube regardless of whether the rod moves up or down.
The amount of oil filled in the valve remains constant. That is,
If the tube rises, the amount of oil below the piston increases
However, the amount of oil above the piston is reduced by the increased amount. Also reverse
If the cylinder tube rises at
The amount decreases, but the amount of oil above the piston increases by the amount of the decrease.
Thus, the amount of oil filled in the cylinder tube is one
Oil tank to absorb changes in filling volume
Need not be provided separately. Therefore, the hydraulic pump and
Hydraulic power units,
The installation space can be further reduced. Note that the above
Oil tank to absorb changes in oil filling
It is not necessary to provide oil,
Replenish oil that is no longer sufficient,
Provide an oil tank for sedimentation as necessary
However, its capacity is sufficient to absorb changes in oil filling.
It is extremely small compared to the oil tank. This departure
According to Ming, hydraulic series such as hydraulic valves, hydraulic pumps, electric motors, etc.
The hydraulic power unit that drives the
Separately attached hydraulic power unit.
There is no need to provide a machine room for storing. Also, hydraulic power
-Make the unit function as a balance weight
Can be.

Further, the present invention provides a hydraulic cylinder lock on a frame.
The cylinder tube to the rod.
And connected to the cylinder tube via connecting means.
In a hydraulic elevator for raising and lowering a basket, the rod
Penetrates the cylinder tube, and the rod
A rod is provided in the cylinder tube and the tip of the rod is
A pulley is provided on the
The cylinder tube is connected to one end of the connecting means,
A hydraulic element, wherein the basket is connected to the other end.
Beta solves the above-mentioned problem.

According to the present invention, the pulley is hung on both sides of the pulley.
Basket and cylinder tube balance, raise and lower the basket
The required load of the hydraulic cylinder is
Is reduced by weight. Therefore, lift the elevator
Energy consumption during the operation can be reduced.

[0011] The present invention also provides a hydraulic elevator as described above.
And the negative of the hydraulic cylinder is connected to the cylinder tube.
The balance weight to reduce the load
Features.

[0012] Compared to the weight of the basket, the weight of the cylinder tube
Is smaller, add a balance weight to the cylinder tube.
By mounting, the weight of the cylinder tube and the weight of the basket
And the load on the hydraulic cylinder is further reduced.
Can be reduced.

[0013]

[0014]

[0015]

[0016]

[0017]

1 and 2 show a hydraulic elevator according to an embodiment of the present invention.
FIG. 1 shows a front view of the hydraulic elevator, and FIG. 2 shows a view as seen from the direction of arrow A in FIG. This hydraulic elevator is located in the elevator space. The elevator cage 11 is guided by an elevator guide 12 so as to be slidable in the vertical direction, and moves up and down, for example, between 1FL and 2FL. On the floor of a frame 19 forming an elevator space, a rod 14 constituting a hydraulic cylinder 13 is provided upright so as to face a vertical direction. A piston 15 is fixed near the center of the rod 14, and a sheave 16 as a pulley is rotatably attached to the upper end of the rod 14. This sheave 1
A wire 17 is wound on 6, one end of the wire 17 is connected to the basket 11, and the other end is connected to a cylinder tube 18 constituting the hydraulic cylinder 13. The basket 11 is lowered by raising the cylinder tube 18, and the cage 11 is raised by lowering the cylinder tube 18.

The cylinder tube 18 is penetrated by the rod 14, and the piston 15 of the rod 14 is
8. The hydraulic cylinder 13 is a so-called double-acting cylinder. Oil ports are provided on both sides of the piston 15 of the cylinder tube 18, and the oil reciprocates by allowing the oil to flow in and out alternately. The replacement of the oil port will be described later.

As shown in FIG. 2, the cylinder tube 18
A hydraulic power unit 20 for driving the hydraulic cylinder 13 is hung on the side surface. The hydraulic power unit 20 includes a hydraulic valve that adjusts oil sent to the hydraulic cylinder 13, a hydraulic pump 22 that supplies oil to the hydraulic cylinder 13, an electric motor 21 that drives the hydraulic pump 22, and the like. The hydraulic pump 22 of the hydraulic power unit 20 and the oil port of the cylinder tube 18 are connected by piping.
The other side of the cylinder tube 18 has a weight as a balance weight 25. The weight of this weight is set, for example, so that the weight on the cylinder tube 18 side is equal to the weight of the basket 11 or equal to the weight of the basket 11 plus about 1/2 of the maximum loading weight. be able to. Thus, the cylinder tube 1
By balancing the weight of the basket 8 with the weight of the basket 11, the load on the hydraulic cylinder 13 required to raise and lower the basket is reduced by the weight of the cylinder tube 18, and the energy consumed when raising and lowering the elevator is reduced. can do.

FIG. 3 shows a hydraulic circuit for moving the cylinder tube 18. When raising the basket 11, the electric motor 21 drives the hydraulic pump 22 according to an instruction from the servo controller 23. The hydraulic pump 22
Oil is drained from above the piston 15 of the cylinder tube 18, oil is supplied below the piston 15, and the cage 11 is raised by lowering the cylinder tube 18. On the other hand, when lowering the elevator cage 11, the discharge direction of the hydraulic pump 22 is changed, and the piston 15 of the cylinder tube 18 is moved.
Oil is drained from below, and oil is supplied above piston 15,
The cylinder tube 18 is raised and the basket 11 is lowered. The switching of the discharge direction may be performed, for example, by switching the suction and discharge directions of the variable discharge pump, or the oil passage may be switched by a direction control valve. In addition, the position of the basket 11 measured by the position detecting device 24 such as an encoder is servo-controlled so that the basket 11 is accurately held at the stop position (two positions in this embodiment).

[0021]

As described above, according to the present invention,
The cylinder tube which constitutes the hydraulic Cylinders to function as a balance weight, since raising and lowering the Jer base over data basket, hydraulic pump, the drive device such as an electric motor is miniaturized, the energy consumption is reduced.

Further, since the hydraulic pump and the electric motor are reduced in size and the amount of oil filling the cylinder tube does not change between the raised position and the lowered position, there is no need to provide an oil tank, so that the hydraulic power unit is made compact. be able to.

Further, when the hydraulic power unit is held by the cylinder tube and integrated therewith, the entire drive unit is integrated in one place, and a machine room for storing the power unit is not required, and the economical effect is increased.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic elevator according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a diagram showing a hydraulic circuit of the hydraulic elevator.

FIG. 4 is a front view showing a conventional hydraulic elevator.

[Explanation of symbols]

 11 Basket 13 Hydraulic Cylinder 14 Rod 15 Piston 16 Pulley 17 Wire (Connecting Means) 18 Cylinder Tube 19 Body 21 Electric Motor (Hydraulic Power Unit) 22 Hydraulic Pump (Hydraulic Power Unit) 25 Balance Weight

Claims (3)

(57) [Claims] 1. A rod of a hydraulic Cylinders fixed to building frame,
In a hydraulic elevator that moves a cylinder tube relative to the rod and raises and lowers a basket connected to the cylinder tube via a connecting means, the rod penetrates the cylinder tube, and
And a hydraulic power unit for driving the hydraulic cylinder is mounted on the cylinder tube. 2. A hydraulic cylinder rod is fixed to the frame.
Move the cylinder tube with respect to the rod,
Raise and lower the basket connected to the Linda tube via the connection means
In a hydraulic elevator, the rod passes through the cylinder tube and
A piston of the rod is provided in the cylinder tube , a pulley is provided at the tip of the rod, and the pulley is attached to the pulley.
A step is provided, and the cylinder tube is connected to one end of the connecting means.
And the other end is connected to the basket.
elevator. To wherein the cylinder tube, hydraulic elevator according to claim 1 or 2, characterized in that inspires the balance weight to reduce the load of the hydraulic silicon <br/> down da.