JPS63242886A - Fluid-pressure elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic elevator of the type that raises and lowers a car by supplying or discharging pressure fluid to a hydraulic actuator.

[Conventional technology]

Conventionally, in this type of hydraulic elevator, pressure fluid was supplied to the hydraulic ram to raise the car, and the car was lowered by discharging the pressure fluid from the hydraulic ram using the weight of the car corner. . The car speed control at this time used a flow control valve to control the flow rate of pressure fluid supplied to and discharged from the fluid pressure ram. Note that related devices of this type include, for example, Japanese Patent Application Laid-open No. 116475/1983.

[Problem that the invention seeks to solve]

In the hydraulic elevator having the above-described structure, the car's own weight to the first power and the load on the corner of the car all act as a compressive force on the plunger of the hydraulic ram. However, since the plunger is structurally a long column supported at both ends, the diameter of the plunger relative to the length of the plunger is determined based on buckling conditions. Therefore, the plunger diameter becomes larger as the car stroke becomes longer.
Therefore, the fluid pressure must be set to a relatively low value. Generally, the pressure is practically 30 kgf/cd or less in many cases.

On the other hand, this type of fluid pressure equipment is generally developed for general industrial use, and many of them are 140 to 210 kgf/d. For this reason, the capacity of fluid pressure equipment is 175~], /7
This means that the cost is relatively high.

Furthermore, the lower operating pressure means that a fluid pressure elevator with the same power will have a higher flow rate, which means that the equipment used will be larger, and therefore the fluid volume will also be larger, requiring a larger space for installation. This is an important factor in high costs.

[Means for solving problems]

In the present invention, a pedestal to which a pulley is attached is fixed to the upper part of the hoistway, and a fluid pressure cylinder is further fixed to an arm extending from the pedestal. A pulley is attached to the piston rod of the fluid pressure cylinder fixed to this arm, and a rope is stretched between the passenger heel, the pulley on the pedestal, and the piston rod pulley.The contraction of the cylinder causes the car to rise, and the car's own weight lifts the cylinder. is designed to extend and lower the square cage.

[Effect]

According to the present invention, since the car is raised by contraction of the cylinder, a tensile force always acts on the piston rod. Since only tensile force acts on the piston rod, there is no buckling and the diameter can be made thinner, and since the vertical length ratio can be ignored, the cylinder can be made higher in pressure and therefore smaller. This means that pumps and control valves can also be made higher pressure and smaller.

Furthermore, since the force that supports the car is received by the arms extending from the pedestal (beam) fixed to the top of the hoistway, the force acting between the pedestal (beam) and the cylinder has no bearing on the building. As with the conventional method, this reduces the burden on the building and allows the building to be prefabricated.

For these reasons, it is possible to reduce the size and cost of the fluid pressure drive device.

〔Example〕

FIG. 1 shows an embodiment of a hydraulic elevator according to the present invention.

The hoistway 1 has an entrance 2 for accessing a car 4, and is provided with a door 3. The seats 4 move up and down along guide rails 5 provided in the hoistway 1. Further, the car 4 is suspended by a rope by a support frame 6. At the upper part of the hoistway 1, a pulley mount 7 is fixed to the building with a fixing member 8, and a pulley 9.10 is attached to the pulley mount 7. A support arm 11 of a cylinder 12 extends from the pulley frame 7, and the cylinder 12 is fixed to the lower part of the support arm 11. cylinder 1
2 has a structure in which the piston rod 13 contracts when pressure fluid is supplied through the plumber 6, and expands when the pressure fluid is discharged. A pulley holding frame 14c is provided at the top of the piston rod 13.
The pulley 14 is attached via the 1st and 4th power.
A rope 1 is connected between the pulleys 9, 10° 14 and the pulley stand 7.
5 is the tension. Although it is possible to stretch the rope 15 between the pulleys 10 and 14 once, twice, or more, the present invention is not limited to the number of times.

The figure shows the case where it is stretched twice.

Figure 2 shows the pulley 10 in Figure 1. FIG. 3 is a side view of the cylinder support arm 11 and cylinder 12, and FIG.
It is a figure seen from above.

The hydraulic elevator according to the present invention is constructed as described above, and the dead weight (Wc) of the passenger car and the applied load (WL) are transmitted to the piston rod 13 of the cylinder 12 via the rope 15. The tension of the rope 15 is WC+WL. At this time, a rope 15 is connected between the pulley mount 7 and the cylinder 12.
A force proportional to the product of the tension of and a number equivalent to twice the number of times the rope is stretched acts. That is, when the rope is stretched twice as in the embodiment, 4 (Wc+w) acts, and this load (compressive force) is supported by the support arm 11. Therefore, no compressive force acts on the building. As can be seen from this, a tensile force of 4 (WC+WI,) is always applied to the cylinder 12, and only a tensile force is applied to the piston rod 13, and no compressive force is applied at all. Therefore, the piston rod 13 only needs to be large enough (diameter) to withstand this tensile force, which is significantly smaller than if it were to withstand compression.

This becomes more noticeable as the stroke of the car 4 becomes larger. By the way, the one that required a diameter of 1201m was 40~
It also becomes 501II11. This also makes it possible to increase the pressure of the working fluid, thereby realizing a significant downsizing of the cylinder.

The operation of the embodiment of the invention is such that when high-pressure fluid is supplied to the cylinder 12 through the plumber 6 by a control valve (not shown), the piston rod 13 contracts and pulls the pulley 14 downward. This movement of the pulley 14 is transmitted to the seat 4 via the rope 15, and in the illustrated example is amplified four times to raise the seat 4. Conversely, the pipe 1 that connects to the cylinder 12 via the control valve
When 6 is connected to the tank, the piston rod 13 of the cylinder is connected via the rope due to the weight of the rider and the load 4.
, which pulls the piston rod upwardly, causes the pressurized fluid within the cylinder 12 to be discharged into the tank, causing the rod to extend and descend into the seat 4.

〔Effect of the invention〕

Because the present invention has the above-described structure and operation, it is possible to use a hydraulic cylinder at high pressure, and therefore, the size can be significantly reduced to obtain the same output. For example, if the rope is stretched as shown in the embodiment, the effective cross-sectional area and stroke of the cylinder will be reduced to 1/4. Furthermore, since the piston rod receives only tensile force, there is no buckling, and it can be made as thin as possible. This reduced flow rate allows other equipment such as hydraulic pumps, control valves, filters, etc. to be significantly downsized, resulting in space savings and cost reductions.

Furthermore, since the support arm from the pulley frame receives the force for supporting or driving the car, a hydraulic elevator can be constructed without imposing any load on the building that exceeds the car's own weight.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a view of the fluid pressure cylinder, pulley, and rope portion seen from the side direction of Fig. 1, and Fig. 3 is a view of Fig. 1 seen from above. It is a diagram. 1... Hoistway, 4... Car, 7... Pulley frame, 9゜゛-shi'

Claims (1)

[Scope of Claims] 1. In a fluid pressure elevator that raises and lowers a car using a drive device that includes a fluid pressure cylinder, a fluid pressure pump that supplies or discharges pressure fluid to or from the cylinder in a controlled manner, and a control valve, the upper part of the hoistway A pulley mount is provided on the mount, a cylinder holding arm is extended from the mount, a fluid pressure cylinder is fixed to the holding arm, a pulley is also provided at the top of the piston rod of the cylinder, and the pulley, the pulley on the pulley mount, and the car are connected to each other. A hydraulic elevator characterized in that a rope is stretched between the car and the car, and the car is pulled up by contraction of the cylinder.