JP2591372B2 - Hydraulic elevator equipment - 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 apparatus having an on-off valve between a hydraulic pump and a hydraulic jack.

[0002]

2. Description of the Related Art FIGS.
FIG. 3 is a diagram showing a conventional hydraulic elevator apparatus disclosed in Japanese Patent No. 44971; FIG. 3 is a configuration diagram, and FIG. In the figure, 1 is a hydraulic jack, 2 is a car driven by the hydraulic jack 1, 3 is a reversibly rotatable hydraulic pump, 4 is an electric motor for driving the hydraulic pump 3, 5 is a main chamber 5
a, a switching circuit having a back chamber 5c isolated from the main chamber 5a via a valve body 5b, a main circuit 6 for connecting the hydraulic jack 1, the switching valve 5 and the hydraulic pump 3 in order, and the hydraulic pump 3 and the switching valve 5 comprises a first circuit 6a connecting the main chamber 5a and a second circuit 6b connecting the main chamber 5a of the on-off valve 5 to the hydraulic jack 1.

[0003] Reference numeral 7 denotes a filter connected to the hydraulic pump 3, which is provided in an oil tank 8. Reference numeral 9 denotes a pilot circuit for connecting the hydraulic jack 1, the on-off valve 5 and the oil tank 8, an inflow pilot circuit 9a for connecting the hydraulic jack 1 and the back chamber 5c of the on-off valve 5, and a back chamber 5c for the on-off valve 5 and the oil tank. It consists discharge pilot circuit 9 b for connecting 8. Reference numeral 10 denotes a normally open first solenoid valve inserted into the inflow pilot circuit 9a, 11 denotes a normally closed second solenoid valve inserted into the discharge pilot circuit 9b, and 12 and 13 denote the inflow pilot circuit 9a and the discharge pilot circuit, respectively. The variable throttle valve 14 inserted in 9b is the first and second solenoid valves 10, 11
Control means connected to the electric motor 4.

The conventional hydraulic elevator apparatus is configured as described above. When an operation command is issued, the electric motor 4 drives the hydraulic pump 3 and the hydraulic pressure in the first circuit 6a increases. The pressure of the first circuit 6a is changed to the second pressure by a pressure detector (not shown).
When it is detected that the pressure is substantially equal to the pressure of the circuit 6b, a command to open the on-off valve 5 is issued from the control means 14. With this command, the first solenoid valve 10 is energized, and the inflow pilot circuit 9a is closed. Thereafter, the second solenoid valve 11 is energized, and the discharge pilot circuit 9b is opened.

[0005] Since the pressure oil in the back chamber 5c of the on-off valve 5 flows into the oil tank 8 through the pilot circuit 9b, the valve element 5b moves to the back chamber 5c, and the on-off valve 5 is opened. Here, when hydraulic oil is supplied from the hydraulic pump 3 to the hydraulic jack 1, the car 2 rises, and the traveling speed of the car 2 is controlled by changing the discharge flow rate of the hydraulic pump 3. When the hydraulic pump 3 is controlled to discharge the pressurized oil from the hydraulic jack 1 to the oil tank 8, the car 2 is controlled to descend.

FIG. 4 shows the details of the operation at the time of a descending operation command. That is, when the motor 4 is operated by issuing a descending operation command and an operation command of the motor 4, the pressure P ₁ of the first circuit 6 a increases. When the pressure P ₁ becomes substantially the same as the pressure P ₂ of the second circuit 6b after a time T ₁ since the operation command of the electric motor 4 is issued, an opening command is issued to the on-off valve 5 and the first solenoid valve 10
Is issued. Then, after the time T ₂ in which the first solenoid valve 10 closes the actually flowing pilot circuit 9a, second
An urging command for the solenoid valve 11 is issued. Thus, the car 2 is activated.

[0007]

In the [0006] conventional hydraulic elevator as described above, the first solenoid valve 10 out operation command of the electric motor 4 after time T ₁ is biased, the second electromagnetic further after a time T ₂ since the valve 11 is energized, operation command becomes longer time T ₃ to the car 2 is started after leaving, takes time to travel start, there is a problem that service to passengers is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and has as its object to provide a hydraulic elevator apparatus capable of shortening the time from when an operation command is issued to when the car is started.

[0009]

Hydraulic elevator apparatus according to a first aspect of the Means for Solving the Problems] The present invention, Rutotomoni operates the first solenoid valve at the same time as the operation command, the hydraulic pump side pressure of the on-off valve
When the pressure reaches a predetermined value close to the pressure on the hydraulic jack side, the second solenoid valve is operated.

In the hydraulic elevator apparatus according to the second invention, the first solenoid valve is operated simultaneously with the operation command, and when the difference between the pressure on the hydraulic pump side of the on-off valve and the pressure on the hydraulic jack side becomes equal to or less than a predetermined value. , And the second solenoid valve is operated.

[0011]

In the first aspect of the present invention, since the first solenoid valve is operated simultaneously with the operation command, the time from the start of operation of the motor to the operation of the first solenoid valve is reduced.

In the second invention, the second solenoid valve is operated when the difference between the pressure on the hydraulic pump side of the on-off valve and the pressure on the hydraulic jack side falls below a predetermined value. The time from when the second solenoid valve operates until the second solenoid valve operates is reduced.

[0013]

[Embodiment 1] FIG. 1 is an explanatory view of an operation state showing one embodiment of the first invention of the present invention, and the same parts as those of the conventional device are denoted by the same reference numerals. FIG. 3 is also used in this embodiment.

This embodiment is configured similarly to the conventional apparatus as shown in FIG. That is, as shown in FIG.
The operation command of the car 2 is issued, the operation command of the electric motor 4 is issued,
When the motor 4 is operated, the pressure P ₁ of the first circuit 6a is increased. Then, at the same time as the operation command of the electric motor 4, an energizing command of the first solenoid valve 10 is issued, and the inflow pilot circuit 9a is closed. At this time, the on-off valve 5 is not yet opened.

[0015] Then, over time between T _1, the pressure P ₁ of the first circuit 6a is that it is now <br/> approximately equal predetermined value the pressure P ₂ of the second circuit 6b is detected, the on-off valve 5 and an urging command for the second solenoid valve 11 is issued. Thus, the on-off valve 5 is opened, and the car 2 is started. This reduces the time T ₂ of the 4, time T ₃ from the out operation command until the car 2 is started is shortened.

Embodiment 2 FIG. FIG. 2 is a main part configuration diagram showing an embodiment of the second invention of the present invention. FIG. 3 is also used in this embodiment.

In the drawing, reference numeral 21 denotes a first pressure detector for detecting the pressure of the first circuit 6a, 22 denotes a second pressure detector for detecting the pressure of the second circuit 6b, and 23 denotes first and second pressure detectors. The pressure difference detecting means detects the pressure difference from the outputs of the sensors 21 and 22 and issues an energizing command for the second solenoid valve 11 when the pressure difference becomes equal to or less than a predetermined value.

That is, similarly to the first embodiment, the first solenoid valve 10 is energized simultaneously with the operation command, and the second solenoid valve is actuated when the pressure difference between the first and second circuits 6a and 6b becomes equal to or less than a predetermined value. Since the valve 11 is energized, the opening time of the on-off valve 5 is advanced. Therefore, the time from when the first solenoid valve 10 is energized to when the second solenoid valve 11 is energized is reduced,
The time to start up is reduced.

[0019]

As described above, in the first aspect of the present invention, the first solenoid valve is operated simultaneously with the operation command, so that the time from the start of operation of the motor to the operation of the first solenoid valve is reduced. As a result, the time from the driving command to the start of the car can be shortened, and the service to the passenger can be improved.

In the second invention, the second solenoid valve is operated when the difference between the pressure on the hydraulic pump side of the on-off valve and the pressure on the hydraulic jack side becomes equal to or less than a predetermined value.
The time from the operation of the solenoid valve to the operation of the second solenoid valve is reduced, and there is an effect that the time from the operation command to the start of the car can be further reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an operation state according to a first embodiment of the present invention.

FIG. 2 is a main part configuration diagram showing a second embodiment of the present invention;

FIG. 3 is a configuration diagram showing a conventional hydraulic elevator device.

FIG. 4 is an explanatory diagram of the operation state of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic jack 2 Basket 3 Hydraulic pump 5 On-off valve 6 Main circuit 6a First circuit 6b Second circuit 8 Oil tank 9a Inflow pilot circuit 9b Discharge pilot circuit 10 First solenoid valve 11 Second solenoid valve 14 Control means 21 First pressure Detector 22 Second pressure detector 23 Pressure difference detecting means

Continued on the front page (72) Inventor, Kazuya Oya, 1 Hishicho, Inazawa-shi, Mitsubishi Electric Corporation, Inazawa Mfg. Co., Ltd. JP-A-4-39278 (JP, A)

Claims (2)

(57) [Claims] An on-off valve is provided in a main circuit connecting a hydraulic jack for driving a car and a hydraulic pump, and an inflow pilot circuit connecting the hydraulic jack and the on-off valve is provided with an inflow pilot circuit for operating the car. And a second solenoid valve that opens the discharge pilot circuit during operation of the car is inserted into a discharge pilot circuit that connects the open / close valve and the oil tank. Second
In elevators for controlling supply and discharge of the pressure oil of the pressure oil by the operation of the solenoid valve to the hydraulic jacks to open and close the closing valve, with operating the same time the first electromagnetic valve and the operation command of the car, the The above hydraulic port of the on-off valve
A predetermined value where the pressure on the pump side is close to the pressure on the hydraulic jack side.
A hydraulic elevator apparatus comprising a control means for operating the second solenoid valve when the pressure reaches a predetermined value. 2. An on-off valve is provided in a main circuit connecting a hydraulic jack for driving a car and a hydraulic pump, and an inflow pilot circuit connecting the hydraulic jack and the on-off valve is connected to the inflow pilot circuit during operation of the car. And a second solenoid valve that opens the discharge pilot circuit during operation of the car is inserted into a discharge pilot circuit that connects the open / close valve and the oil tank. Second
A first pressure detector for detecting a pressure on the hydraulic pump side of the on-off valve in an elevator that controls the supply and discharge of the hydraulic oil to the hydraulic jack by opening and closing the on-off valve by the operation of a solenoid valve A second pressure detector for detecting a pressure on the hydraulic jack side of the on-off valve, and a pressure difference detection means that operates when an output difference between the first and second pressure detectors becomes equal to or less than a predetermined value; A hydraulic elevator apparatus comprising control means for operating the first solenoid valve simultaneously with a car operation command and operating the second solenoid valve when the pressure difference detecting means operates.