JP2001048446A - Hydraulic elevator having moving function at emergency stop time - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collect loaded goods by elevating a carrying cage manually at the emergency stop time such as a power cut in a hydraulic elevator. SOLUTION: In this elevator, balance weights 11 (11a, 11b) are provided on the ram 3 engaged with a hydraulic cylinder 1 and a rope 7 on whose tip a carrying cage 10 is connected is engaged with the ram 3 and further a hydraulic circuit communicating the oil supply port 12 for ram ascending and the oil supply port 13 for ram descending of the hydraulic cylinder 1 with two way delivery type hydraulic pump 14 through open/close valves 16a, 16b respectively is provided and they are communicated with an oil tank 25 through a check valves 27,8. Further, a pressuring port 24 and oil return port 26 communicating with a manual pump 23 and oil tank and a manual selector valve 20 having a ram ascending port 21 and ram descending port 22 communicating with the oil supply port for ram ascending and the oil supply port for ram descending port are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic elevator equipped with a device capable of manually collecting or rescuing a load or an occupant when the hydraulic elevator is stopped in an emergency.

[0002]

2. Description of the Related Art Hydraulic elevators usually move hydraulically driven hydraulic pumps driven by an electric motor into and out of a cylinder to move a transport cage for transporting people and luggage in a vertical direction. It is to let. Among such hydraulic elevators, there is a hydraulic elevator in which both discharge ports are connected to a ram raising oil supply port and a ram lower oil supply port of a cylinder using a two-way discharge hydraulic pump. In this type of hydraulic elevator, for example, the ram is raised by sending hydraulic oil from one discharge port to a ram elevating oil supply port, and the ram is sent by sending hydraulic oil from the other discharge port to a ram descent oil supply port. The lowering is further performed by attaching a carrying cage to the ram and hanging a rope on a pulley provided on the ram and attaching a balance weight to the other end of the rope, or attaching a balance weight to the ram. At present, a large number of pulleys provided on the ram with ropes attached thereto and a transport cage attached to the other end are used. By using the balance weight in this manner, the load on the electric motor that drives the hydraulic pump is greatly reduced, and an effective energy saving effect can be obtained.

[0003]

However, in such a hydraulic elevator, when the transport cage stops at an incorrect position during the operation of the elevator due to a power failure or a failure of an electric motor, that is, stops at a position between the floors. It is necessary to safely secure the luggage and the like in the transport cage, but at present, there is no simple rescue device with such a simple configuration in an emergency.

[0004]

According to the present invention, as a result of various studies, a hydraulic elevator having a function of manually moving a transport cage during an emergency stop has been developed.

That is, in the hydraulic elevator according to the present invention, a balance weight or a carrying cage is provided at the upper end of a ram connected to a hydraulic piston that moves up and down in a hydraulic cylinder, and a downward force is applied to the ram, and at the same time, the carrying cage or A pulling force is applied to the ram by engaging a rope connected with a balance weight to the upper end, and a ram raising oil supply port and a ram lower oil supply port of the hydraulic cylinder are bidirectionally connected via an on-off valve. In a hydraulic elevator having a hydraulic circuit connected to both discharge ports of a discharge pump, both the ram raising oil supply port and the ram lower oil supply port communicate with an oil tank via a check valve, and are further operated from the oil tank. A tank consisting of a pressurization port that communicates with the discharge port of a manual pump that sucks and discharges oil, and an oil return port that communicates with the oil tank A manual connection valve having a side connection portion and a cylinder-side connection portion including a ram raising port communicating with the ram raising lubrication port and a ram lowering port communicating with the ram lowering lubrication port, wherein the manual switching valve is neutralized. When set to the position, the two ports of the tank-side connection and the two ports of the cylinder-side connection are internally shut off, and when the ram is lowered, the ram-up port and the ram-down port of the cylinder-side connection are connected to the tank. That communicates with the oil return port and the pressurization port of the cylinder, and when the ram is in the ram-up position, the ram-up port and the ram-down port of the cylinder-side connection are connected to the pressurization port and the oil-return port of the tank-side connection This is a hydraulic elevator having a function of moving at the time of an emergency stop, characterized in that the elevator is installed.

In the above-mentioned hydraulic elevator, it is preferable to connect the discharge ports of the replenishing hydraulic pump to the two discharge ports of the two-way discharge hydraulic pump via check valves.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

In the hydraulic elevator according to the present invention, for example, as shown in FIG. 1, an upper end of a ram (3) connected to a piston (2) moving up and down in a hydraulic cylinder (1) is integrated with the ram (3). The upper end of the ram is provided with a sheave (4) and two fixed sheaves (5) and (6) are provided on the outside. The ram upper sheave (4) is provided with a transport cage (10) for loading people and luggage.
Balance weight (11) to offset the weight of 0) to some extent
a) (11b) is attached. The hydraulic circuit of the hydraulic elevator having such a structure basically includes a ram raising oil supply port (12) and a ram lower oil supply port (13) of the hydraulic cylinder (1) connected to the electromagnetic on-off valve (16).
a) A two-way discharge hydraulic pump (1
4) connected to the two discharge ports (15a) and (15b).

In order to operate the hydraulic elevator having such a configuration, for example, when trying to raise the ram (3), one of the electromagnetic on-off valves (16a) is switched to the N side in the figure and the other electromagnetic on-off valve (16b) is switched. ) Is switched to the Q side to operate the two-way discharge type hydraulic pump (14) with one discharge port (15a) on the discharge side and the other discharge port (15b) on the suction side, thereby operating the hydraulic pump (14). ) Is sent to the ram raising oil supply port (12) of the cylinder (1) through the solenoid on-off valve (16a) to raise the ram (3). At the same time, the hydraulic oil in the cylinder (1) is discharged from the ram lowering oil supply port (13), and is sucked into the other discharge port (15b) of the hydraulic pump (14) through the electromagnetic on-off valve (16b). Therefore, at this time, the transport cage (10) is lowered.

An embodiment of the present invention in which a manual operating device for emergency rescue described below is attached to such a hydraulic elevator will be described below with reference to FIG. As a manual actuator,
A ram elevating port (21) communicating with the ram elevating lubrication port (12) and a ram lowering port (22) communicating with the ram lowering lubrication port (13) are provided as two ports on the cylinder side connection part. Pressurizing port (24) communicating with a manual pump (23) as two ports at the connection
And an oil return port (26) communicating with the oil tank (25)
And a 3-position 4-port manual switching valve (20).

In such a hydraulic elevator, if a power failure or the like occurs during the operation of the hydraulic elevator, the transport cage (10) may remain stopped at a certain position between the floors to be stopped. There is. At the time of such an emergency, when the transport cage (10) is to be moved to, for example, a lower floor, the manual switching valve (20) is switched to the B side. That is, the ram lowering oil supply port (13) of the hydraulic cylinder (1) is communicated with the oil tank (25), and the ram elevating oil supply port (12) is communicated with the discharge port of the manual pump (23). Therefore, when the maximum weight is loaded on the transport cage (10) and a pulling force is applied to the ram (3) of the hydraulic cylinder (1) so as to constantly raise the ram, the ram lowering refueling is performed. The hydraulic oil in the hydraulic cylinder (1) is automatically extruded through the port (13) and discharged to the oil tank (25), and at the same time, the ram lifting oil supply port (12) is passed through the check valve (27) to the oil tank. Since the hydraulic oil sucked up from (25) is supplied into the hydraulic cylinder (1), the ram (3) rises and the transport cage (10) descends.

Further, when the load of the load in the transport cage (10) is small and a downward pulling force is constantly applied to the ram (3), and the total weight of the transport cage and the balance weight (11a) ( When the weight of 11b) is substantially balanced, the manual pump (23) is operated to supply the hydraulic oil from the ram elevating oil supply port (12) into the hydraulic cylinder (1), so that the ram lowering oil pump ( By forcibly extruding the hydraulic oil in the hydraulic cylinder through 13) and discharging it to the oil tank (25), the ram (3) can be raised and the transport cage (10) can be lowered.

Next, when the transport cage (10) is to be moved to, for example, an upper floor in the emergency, the manual switching valve (20) is switched to the A side. That is, the ram lifting oil supply port (12) of the hydraulic cylinder (1) is connected to the oil tank (2).
5), and the ram lowering oil supply port (13) communicates with the discharge port of the manual pump (23). Therefore, the load of the load in the transport cage (10) is small and the ram (3)
When a downward pulling force is constantly applied to the hydraulic cylinder (1), the hydraulic oil in the hydraulic cylinder (1) is automatically pushed out through the ram elevating oil supply port (12) to the throttle valve oil tank (25). Is discharged, and at the same time, the lubrication port (1
In 3), the hydraulic oil sucked up from the oil tank (25) through the check valve (28) is supplied to the hydraulic cylinder (1), and the ram (3) is lowered to move the transport cage (1).
0) will rise.

In the case where the carrying cage (10) is loaded with the maximum weight and a pulling force is applied to the ram (3) of the hydraulic cylinder (1) so as to constantly raise the ram, and When the total weight on the transport cage side and the weights of the balance weights (11a) and (11b) are substantially balanced, the manual pump (23) is operated to supply hydraulic oil from the oil tank through the manual switching valve (20) to the ram lowering lubrication. The oil is fed to the port (13) and supplied into the hydraulic cylinder (1), thereby forcibly extruding the hydraulic oil in the hydraulic cylinder through the lubricating oil supply port (12) and the oil tank (25) through the throttle valve (30). Ram (3)
Can be lowered to raise the transport cage (10).

In the drawing, reference numeral (31) denotes a hydraulic pump for replenishing hydraulic oil. The hydraulic pump (14) branches out of the discharge port thereof and passes through two check valves (32a) (32b). To both discharge ports. When the hydraulic oil in the hydraulic circuit is reduced as a leak from an external drain or a connection point, the hydraulic oil has an action of supplying the reduced amount to the circuit. At this time, the motor for driving the two-way discharge hydraulic pump (14) may be an ordinary induction motor in addition to the inverter drive motor (33) as shown in the figure.

In addition, without installing a supply hydraulic pump, FIG.
As shown in the figure, both discharge ports (15a) and (15b) of the two-way discharge hydraulic pump (14) are connected to the negative pressure prevention valve (34a).
It may be connected to the oil tank (25) via (34b). With such a circuit, it is possible to automatically supply hydraulic oil.

[0017]

As described above, according to the present invention, even when the hydraulic elevator stops in an emergency due to a power failure or the like, its transport cage can be raised and lowered manually, so that it can be used as an emergency rescue device. Very useful. The manual switching valve, which is such a rescue device, may be installed outside the elevator, but may also be installed in a transport cage of the elevator.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram showing one embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram showing another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 hydraulic cylinder 2 piston 3 ram 4 ram upper sheave 5, 6 fixed sheave 7 rope 10 transport cage 11a, 11b balance weight 12 ram raising oil supply port 13 ram lower oil supply port 14 two-way discharge hydraulic pump 15a, 15b discharge port 16a, 16b Solenoid on-off valve 20 3-position 4-port manual switching valve 21 Ram up port 22 Ram down port 23 Manual pump 24 Pressurizing port 25 Oil tank 26 Oil return pump 27, 28 Check valve 30 Throttle valve 31 Replenishing hydraulic pump 32a, 32b Check valve 33 Inverter control motor 34a, 34b Negative pressure prevention valve 35a, 35b Suction strainer

Claims (2)

[Claims] 1. A rope having a balance weight or a carrying cage provided at an upper end of a ram connected to a hydraulic piston which moves up and down in a hydraulic cylinder and applying a downward force to the ram, and at the same time, a carrying cage or a balance weight connected to the tip. Is engaged with the upper end portion to apply a pulling force to the ram. Further, the ram raising oil supply port and the ram lowering oil supply port of the hydraulic cylinder are connected to both ends of the two-way discharge hydraulic pump via open / close valves. In a hydraulic elevator having a hydraulic circuit connected to a discharge port, both the ram raising oil supply port and the ram lower oil supply port communicate with an oil tank via a check valve, and further suck up hydraulic oil from the oil tank. Tank side connection consisting of a pressurization port communicating with the discharge port of a manual pump that discharges and an oil return port communicating with the oil tank, and for raising the ram A manual switching valve having a ram-up port communicating with an oil port and a cylinder-side connecting portion composed of a ram-down port communicating with a ram-down oil supply port, wherein the tank is connected when the manual switching valve is in a neutral position. When the ram is in the lowered position, the ram-up port and ram-down port of the cylinder-side connection are connected to the oil return port and pressurization of the tank-side connection. When the ram is in the ram-up position, the ram-up port and the ram-down port of the cylinder-side connection are connected to the pressurization port and the oil return port of the tank-side connection. Hydraulic elevator with emergency stop movement function. 2. The hydraulic elevator according to claim 1, wherein the discharge ports of the supply hydraulic pump are connected to the two discharge ports of the two-way discharge hydraulic pump via check valves, respectively.