JPS61106385A - Hydraulic 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] The present invention relates to hydraulic elevators.

In recent years, for warehouses and apartment buildings with fewer floors,
Hydraulic elevators are becoming more and more popular as they are relatively inexpensive and easy to operate. There are two types of such hydraulic elevators: a direct type in which a hydraulic jack is installed directly below the car to directly raise and lower the car, and an indirect type in which a hydraulic jack is installed directly below the car to raise and lower the car, and an indirect type in which a hydraulic jack is installed via a rope, sheave, etc.

FIG. 3 shows a schematic diagram of the above-mentioned indirect hydraulic elevator. In a machine room 2 adjacent to the hoistway 1, a power unit 3, which is a driving source for the hydraulic elevator, is installed. Pressure fluid generated within the power unit 3 is sent to the hydraulic jack 5 through the piping 4, and the plunger 6 is raised. A sheave device 7 is attached to the upper end of the plunger 6 to guide a hanging rope 8 and indirectly support a car 9.

One end of the hanging rope 8 is attached to the jack stand lla in the pit 10 via a spring 12a, and the other end is attached to the jack stand lla in the pit 10.
It is stretched through a spring 12b to a rope attachment frame 13 that protrudes further. Further, the heel 14 is a guide device when the heel 9 moves up and down along the guide rail 15.

That is, the car 9 is suspended by a hanging rope 8, and the plunger 6 is raised by the pressure fluid generated by the power unit 3.
rises twice as fast as

On the other hand, when the car 9 is forced to descend, the liquid in the cylinder 6 passes through the pipe due to the weight of the car 9 and flows back to the tank 17 of the power unit 3, causing the car 9 to descend.

Now, in the case of a hydraulic elevator, the strength of the plunger 6 of its cylinder-plunger mechanism is an important point, and as shown in FIG. If the receiving area of the jar 6 is a person, the pushing up force due to the hydraulic pressure 1 on the pushing jar 5 is P-person, and this pushing up force is equal to the weight W, which is the sum of the seat weight 9 and the cargo 19. Raise the heel 9 against approximately twice the force. Therefore, when the compressive force W is applied to the plunger 6), as the length l of the plunger 6 increases, there is a risk that the plunger 6 will buckle.

In other words, considering the buckling of the plunger 6, the plunger 6 is generally a hollow tube with an outer diameter DO1 and an inner diameter D.
If i, the limit load Pcr for buckling is given by a set of oilers for a long column. Dl))a
; Thickness cross-sectional area of plunger 6 Ca = + 7 (Do"-Di") ) n; Column fixing coefficient (n = 1 when both ends are supported by pins) n♂II pcr = □ ... ...(1) e where π; Pi ratio E; Young's modulus r of the plunger 6. In other words, the buckling limit load Pcr decreases in proportion to 2 to the square of the length e of the plunger 6. This means that as the lift height of the 0 repeater increases, the Pushinger 6 approaches the limit of buckling, and the Granger 6 cannot be made too long, and there is a limit to the lift height of the elevator. ) Konaru.

In addition, as can be seen from the above formula (1), if E (secondary moment of area) I is increased, the buckling limit load Pcr increases,
It is possible to increase the lifting head of the elevator, but in order to increase this moment of inertia, the outer diameter Do of the plunger 6 must be increased and the inner diameter Di must be decreased. 6 increases in size and weight, and the required driving source power also increases. In this case, the entire elevator drive device including the drive source 1 and the cylinder/plunger mechanism must be made stronger and larger, which is a problem as there is no point in improving it.

Therefore, this type of hydraulic elevator currently has a limited lifting height of 20 to 25 m at most, and is limited to about 8 to 9 floors in a building, and cannot be used for taller buildings. The current situation was that it was not.

For this reason, the height of buildings has increased significantly in recent years, especially in urban areas, where most buildings exceed 10 floors, and it is said that such tall buildings are disadvantageous in terms of layout of machine rooms. Electric hoisting elevators (a hoisting machine installed in the upper machinery room of a building lifts and lowers the car by suspending it via a rope) are used, but this type of elevator is less economical than a hydraulic type. Because of the large size and problems such as complicated and troublesome installation work, maintenance, and inspection, it is desired that hydraulic elevators be installed and used in buildings with about 10 to 20 floors, if possible.

Furthermore, in hydraulic elevators that are used in low-rise buildings, it is expected that costs will be reduced by making the plunger 6 smaller in diameter and downsizing the entire device.

In other words, there is a strong demand for a hydraulic elevator that can raise the lift without changing the plunger diameter compared to conventional ones, or that can reduce the plunger diameter for the same lift. .

[Purpose of the Invention] In order to meet the above-mentioned needs, the present invention aims to provide a hydraulic elevator with a high lifting height by creating a structure that can improve the buckling strength by one degree without changing the plunger diameter. be.

[Summary of the invention]

The present invention provides a hydraulic jack plunger with a large slenderness ratio and is lightweight in order to achieve a large lifting height of a hydraulically driven elevator, and a second guide rail is provided in parallel with the plunger.
The second guide rail guides the upper end of the plunger and prevents buckling of the center of the plunger.
The plunger guide device is provided with a second plunger guide device, and the second plunger guide device is always engaged with the central portion of the plunger when the plunger moves upward and downward.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

Hoistway: Cars for transporting passengers provided in this shaft are guided by first guide rails extending over the entire wall of the hoistway.

As in the conventional case shown in FIG. 3, the car 9 is connected to the lobe mounting plate 131 of the heel 9 through the sheave device 7, the hanging rope 8, etc. from the attached hydraulic jack 1 in the hoistway to the machine room. 2
A hydraulic jack 5 expands and contracts from a hydraulic pressure control device 1 provided at the top, and a shaft 9 moves up and down along with it.

Particularly, in the present invention, in order to prevent buckling of the large lift plunger, a second guide rail of the hydraulic jack 5, which is not normally provided, is provided in parallel with the hydraulic jack 1.

In FIGS. 1 and 2, a second guide rail 20 is fixed to the shaft 1 via a rail bracket (not shown), parallel to the plunger 61 projecting from the upper part of the hydraulic jack 5, and A frame 21a is integrally fixed to the upper part of the engaging plunger 6 and protrudes from the frame 21a.
A first plunger guide device 21 is provided which includes a guide 21b such as a guide shoe or a guide roller.

Furthermore, a second plunger guide device 22 is provided, which is located near the length symbol of the lower plunger 6.

A guide roller 22b that contacts the entire outer circumference of the plunger 6 in the center of the second guide rail 2 passing frame 22a.
(or a guide shoe), and a guide roller 22C (or a guide shoe) that similarly engages the second guide rail 20 is provided at the end. In order to always maintain the position of the second plunger guide device 22 at approximately the center, a rotating body such as a sheave, pulley, or sprocket is mounted near the center of the second plunger guide device 22 on a bearing 23a. Shaft 23b
When the flexible body 1 is hung by a trowel, one end is connected to the upper part of the hoisting path and the other end is connected to the upper part of the plunger, and the second plunger guide device 22 is supported by a rope, chain, etc. via the rotary body n. is located approximately at the center of the plunger 6.

With this configuration, the first plunger guide device 21 is guided along the second guide rail 20 at its upper end. The second plunger guide device 22 is a low-speed guide device that moves the plunger 6 by the distance A because it is connected to the rotating body n.

According to this, if the length of the flexible body of the second plunger guide device 22 is initially adjusted to a position approximately midway in the longitudinal direction of the plunger 6, the plunger 6 will move up and down unless the flexible body expands and contracts. However, the central part can always be supported against buckling.

[Effects of the Invention] As a result, the central portion of the plunger is supported, and one dimension in equation (1) above is approximately H, so the buckling load Pcr is reduced by approximately 1%. Further, for the same load W, the length l of the plunger can be doubled by 1, that is, the vertical stroke of the elevator can be doubled compared to when there is no second plunger guide device.

As described above, according to the present invention, the buckling strength of the plunger can be significantly improved, thereby making it possible to obtain an inexpensive hydraulic elevator with a high head.

[Brief explanation of drawings]

Fig. 1 is a front view of the main part of the present invention, Fig. 2 is a view taken from the direction of arrow T in Fig. 1, and Fig. 3 is a side view of a conventional hydraulic elevator.
The figure is an explanatory diagram of the plunger strength in FIG. 3. 1... Hoistway 5... Liquid king jack 6... Plunger 9... Car 15... First guide rail 20... Second guide rail 21... First plunger Guide device 22...-second plunger guide device (7317) Agent: Patent attorney Noriyuki Chika (
(1 person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] In an elevator equipped with a car provided in a hoistway, a first guide rail for guiding the car, and a hydraulic jack for driving the car up and down, a second guide rail provided in the hoistway in parallel with the hydraulic jack; a first plunger guide device fixed to the upper part of the plunger that engages with the second guide rail; and a first plunger guide device that movably engages with the outer periphery of the approximately middle portion of the plunger in the longitudinal direction and the second guide rail, and the plunger A hydraulic elevator characterized in that it is equipped with a second plunger guide device whose moving speed is lower than that of the hydraulic elevator.