JPH0420470A - Oil-hydraulic elevator - Google Patents

Abstract

PURPOSE:To perform carrying-in and-out of a dolly without obstacle by furnishing a driver device actuated with a stop signal on the cage side, and providing a brake which is contacted with a guide rail by the power from the driver device and separated from the guide rail when the power is put off. CONSTITUTION:When a plunger is expanded and shrunk by the working oil fed from a driver device 29, a cage of an oil-hydraulic elevator concerned moves in the vertical direction under guidance of a guide rail 9. When the cage stops at the specified floor, a solenoid-operated selector valve 35 and a pump 39 are put in the operating state by the stop signal at the time. The working oil from the pump 39 is fed to casings 31, 31, and a brake 27 contacts the guide rail 9 strongly, and secured condition is obtained by the friction force at the time. Consequently the cage is free from sink or floating up regardless of load, so that carrying-in and-out of objects by a dolly can be performed without obstruction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) This invention relates to a hydraulic elevator suitable for loading and unloading a load carrier into and out of a car.

(Prior Art) Generally, in a hydraulic elevator, a car is guided by a hydraulic device to guide rails to move up and down.

The hydraulic system is composed of a cylinder and a plunger that can extend and contract vertically with respect to the cylinder, and the plunger is expanded when hydraulic oil is fed into the cylinder.

(Problems to be Solved by the Invention) As mentioned above, hydraulic elevators use hydraulic oil to expand and contract the plunger, so for example, due to the live load,
Since the hydraulic fluid in the cylinder or piping route is compressed, the following adverse effects occur. That is, compared to the no-load state where the compression effect is small, this appears as a level displacement of the stopping position of the car.

In addition, in hydraulic elevators that use lobes in the hydraulic system, such as indirect type, the extension of the lobes and the deflection of the springs provided at the lobe hitch are integrated, so the displacement of the car's stopping level becomes increasingly large. Become. This phenomenon is magnified as the load becomes larger and the elevator goes up and down higher, due to the influence of the amount of oil and the length of the lobe. Therefore, this stop level displacement leads to sinking or floating of the car, which appears as a difference in level when loading and unloading cargo. If a difference in level occurs, the cargo cart will tilt during loading and unloading, causing the cargo on the cart to collapse or slipping, causing damage to the cargo, and in the worst case scenario, loading and unloading the cargo into and out of the cart will become impossible. This may lead to other problems.

Therefore, the present invention was made in view of the above circumstances, and an object of the present invention is to provide a hydraulic elevator that can prevent the car from sinking or floating when the elevator stops at a floor, without being affected by changes in load. .

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention provides a hydraulic device that includes a cylinder and a plunger that can move up and down with respect to the cylinder. In a hydraulic elevator in which a car moves up and down while being guided, the car side includes a drive device that is activated by a stop signal from the car, and a drive device that strongly contacts the guide rail using power from the drive device. A brake body is provided that can advance and retreat away from the guide rail when power is cut off from the guide rail.

(Function) According to this hydraulic elevator, the car is guided by the guide rail and moves up and down as the plunger expands and contracts.

On the other hand, when the car stops at a stop floor, the stop signal activates the drive device and the brake body makes strong contact with the guide rail, and the frictional force at that time provides a fixed state. As a result, sinking or floating does not occur regardless of changes in the load, and the loading and unloading of the load carrier can be carried out without any problem.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings of FIGS. 1 to 3.

In FIG. 1, reference numeral 1 designates a car of a direct hydraulic elevator 3 of a type that is moved up and down by a plunger, which will be described later. Guide shoes 11 that can slide along a pair of opposing guide rails 9 are provided at four locations on the lower car floor 5 of the car 1 and the upper car ceiling 7. The car 1 is controlled to be able to move up and down.

The hydraulic system 13 consists of a cylinder 17 fixedly supported at the bottom of the hoistway 15 and a plunger 19 that can extend and contract up and down with respect to the cylinder 17.
Hydraulic oil is fed into the cylinder 17 from the power unit 23 equipped with the above via the vibrator 25, thereby extending upward. Further, the hydraulic fluid is reduced by escaping from the cylinder 17 to a tank (not shown).

The control valve 21 of the power unit 23 is switched and controlled by a signal from a call button switch (tooth not shown) provided on each floor, and the expansion and contraction of the plunger 19 can be controlled.

Furthermore, a pair of brake bodies 27, 27 are provided on the car floor 5 and the car ceiling 7 of the car 1, and are movable toward and away from the side surfaces of the guide rails 9, 9. It is possible to move forward and backward using power (hydraulic oil) from the driven drive device 29.

The brake body 27 is formed into a rod shape as shown in FIG.
It is fitted into the casing 31 so as to be freely movable forward and backward, with a slight gap α being maintained with respect to the guide rail 9.

As shown in FIG. 2, the casing 31 is interlocked and connected to the electromagnetic switching valve 35 of the drive device 29 via a vibrator 33, and moves forward (arrow A) by feeding hydraulic oil into the casing 31, supplying hydraulic oil. Casing 3]
It is designed to return to its original state by a biasing spring 37 interposed therein. The drive device 29 is the electromagnetic switching valve 3 described above.
5, a pump 39, and a safety valve 41.

The electromagnetic switching valve 35 and the pump 39 enter the operating state when a stop signal from the car is input, and switch to the non-operating state when the stop signal is cut off.
The spool 35a moves to the left in FIG. 2, and the hydraulic oil from the pump 39 comes to be sent into each casing 31, 31.

Furthermore, when the electromagnetic switching valve 35 is in the neutral state,
Each port P on the input end and the output side is in constant communication with the tank T.

The safety valve 41 is provided in the circuit between the pump 39 and the electromagnetic switching valve 35, and serves as a normal relief valve that functions to release pressure to the tank T when the pressure in the circuit exceeds a certain pressure.

According to the hydraulic elevator 3 configured in this way, when one plunger is expanded or contracted by the hydraulic oil from the drive device 29, the car 1 is guided by the guide rail 9 and moves up and down.

Next, when the car 1 stops at the stop floor, the electromagnetic switching valve 35 and the pump 39 are activated by the stop signal at that time, and the hydraulic oil from the pump 39 is supplied to each casing 31.3.
The brake body 27 is fed into the guide rail 9 and comes into strong contact with the guide rail 9, and a fixed state is obtained by the frictional force at this time. As a result, the car 1 is not influenced by loads such as carrying loads and does not sink or float, so that cargo can be carried in and out by the cargo carrier without any problem.

Although the brake body 27 is of a hydraulic type controlled by hydraulic oil from the drive device 29, it may be of an air type or a mechanical type.

In addition, in an indirect hydraulic elevator where an uneven load acts, when rollers 43 that receive an uneven load above and below the car 1 are supported so as to roll along the guide rail 9, as shown in FIG. In this case, it is preferable to provide the brake body 27 on the bracket 45 that supports the roller 43. This makes it possible to reduce the load acting on the roller 43 when the roller 43 is stopped.

[Effects of the Invention] As explained above, according to the hydraulic double lever of the present invention, the braking body that makes strong contact with the guide rail allows the car to be positioned correctly on the floor without being affected by changes in the live load. Since the position can be determined, loading and unloading of the load carrier can be carried out without any problem.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a hydraulic elevator in which the present invention is implemented, Fig. 2 is a detailed view of the braking body and drive device, Fig. 3 is a sectional view of the braking body, and Fig. 4 shows another method of installing the braking body. FIG. 1... Car 9... Guide rail 17... Cylinder 19... Plunger 27... 2 braking bodies... Driving device cost Hidekazu Miyoshi, a visiting officer Figure 1 1... Car 9-・Guide rail 17...Cylinder 19...Plunger 27・Brake body Fig. 2 wJ3 Fig. 4

Claims (1)

[Claims] In a hydraulic elevator in which a car is guided by a guide rail and moves up and down by a hydraulic device consisting of a cylinder and a plunger that can move up and down with respect to the cylinder, a drive device on the car side is activated by a stop signal from the car. and,
A hydraulic elevator characterized in that a brake body is provided that is able to strongly contact the guide rail with power from the drive device and move back and forth from the guide rail when the power from the drive device is cut off.