KR870001274Y1 - An elevator - Google Patents

Abstract

No content.

Description

Operation control circuit at valve replacement in hydraulic elevator

1 is a schematic structural diagram of a hydraulic elevator.

2 is a circuit diagram of the present invention.

3 is a flowchart for explaining the present invention.

* Explanation of symbols for main parts of the drawings

1: Cage 2: Cam

3: Down stop switch (DLS) 4: Plunger

5: cylinder 6, 6 ', 6 ": flow pipe

7: Coupler 8: Stop Valve

9: hydraulic control unit 10: jump

11: motor 12: oil tank

SW ₁ : Switch for switching valve A: Valve replacement terminal

B: Valve replacement terminal c: Normal operation terminal

A: Valve replacement completion detection relay B: 1st floor operation command relay

C: Falling low speed operation command relay D: Normal operation command relay

E: Rising low speed operation command relay

S ₁ , S ₂ : Solenoid for rising and falling low speed operation

Aa ₁ , Ab ₂ : Contact point a and b of valve replacement completion relay

Ca ₁ -Ca _2, Cb ₁ -Cb ₄ : contacts a and b of descent low speed operation command relay

Ea ₁ : Contact a of the rising low speed operation command relay

Ka ₁ , Kb ₁ -Kb ₂ : contacts a and b of the 1st floor detection relay

Ja ₁ : a contact of door closed completion detection relay

DLSb ₁ : contact b of the down stop switch (DLS)

BZ: Buzzer

The present invention relates to an operation control circuit of a hydraulic elevator.

The operating principle of the general hydraulic elevator is that as shown in FIG. 1 during the ascending operation of the elevator by the rotation of the motor 11, the pump 10 hydraulically pumps oil in the oil tank 12 through the flow pipe (6) The oil is discharged to the control unit 9, and this oil flows into the cylinder 5 through the stop valve 8 and the flow pipe 6 ', so that the plunger 4 fixed to the cage 1 is provided. Is moved by the hydraulic pressure to drive up.

In addition, during the lowering operation, the valve of the hydraulic control unit 9 is opened, so that the oil in the cylinder 5 is transferred through the flow pipe 6 ', the stop valve 8, the hydraulic control unit 9, and the flow pipe 6 ". Inflow into the tank 12, the plunger fixed to the cage (1) is moved down because the elevator is to operate the down.

Here, the purpose of providing the stop valve 8 is to lock the stop valve 8 to the cylinder 5 at the time of replacing the hydraulic control unit 9, the pump 10, the flow pipes 6, 6 ", and the like. In order to prevent the oil from leaking out, and also in the event of an emergency during operation of the elevator, it is to play a role to prevent the operation of the elevator by locking the stop valve (8).

However, if the stop valve 8 is defective or replacement is inevitable due to secular variation, there is no preventive measure to prevent the leakage of the oil contained in the cylinder 5, so that the oil flows out of the flow pipe 6 '. This has resulted in operational problems and loss of oil, which had to be left to contaminate the floor of the workshop or had to prepare and receive a separate sump.

The present invention is conceived in order to replace the valve in the state with the least amount of oil contained in the cylinder as possible in view of the above problems, described in detail by the accompanying drawings as follows.

The valve replacement switch SW _{1 is} connected to the terminal A by connecting the valve replacement completion relay A through the b contact of the falling low speed operation command relay C, and the terminal of the switching switch SW ₁ . b) are connected in series to the first floor detection relay (K), b-contact of the (not shown) (Kb ₁₎ and lowering low-speed operation command via the b-contact (Cb ₂₎ of relay first floor operation command connected to the relay (b) Then, the falling low speed operation command relay C is connected through the a contact Ka ₁ of the first floor detection relay connected in parallel and the a contact Ca ₁ of the falling low speed operation command relay.

The solenoid for descent low speed operation is connected to the a contact (Ca ₂ ) of the descent low speed operation command relay, the dLSB ₁ of the descent stop switch (DLS), and the a contact (Ja ₁ ) of the door closing detection relay (J) connected in series. Connect the (S ₁ ) and the buzzer (BZ), and connect the normal operation command relay (D) to the b contact (Cb ₃ ) of the descending low speed operation command relay connected in series, and the b contact (Ab ₁ ) of the valve replacement completion relay. Connected to and connected to a series of valve replacement detection relays connected in series (a ₁ ), b contact (Cb ₄ ) of the low-speed low speed operation command relay, and b contact (Kb ₂ ) of the 1st floor detection relay. E) the connections, the increased low-speed operation command a contact of the relay (E) (Ea ₁₎ is connected to for Motor and increase low-speed driving solenoid (S ₂₎ for the emitter drive relay (F) in parallel, and the normal operation The contact a (Da ₁ ) of the command relay (D) is configured by connecting to a known normal driving circuit unit (G).

(A) is the valve replacement terminal, (B) is the valve replacement terminal, (C) is the normal operation terminal, and a contact ( ) Is the contact that is turned on when the relay is running, and b contact ( ) Is a contact that is turned off when the corresponding relay is driven, 3P is a three-phase AC power supply, FFB is a car short _circuit , and F ₁ and F ₂ are contacts a of the motor driving relay F.

Referring to the effects of the present invention configured as described above are as follows.

In the description of the present invention, it is assumed that the lowest floor is the first floor during the normal operation of the elevator.

The switch replacement switch SW _{1 of} FIG. ₁ is connected to the valve replacement terminal ( _b ) at the normal operation terminal (c). When the elevator is located on the first floor, the first floor detection relay (K) (not shown) ) Is driven and its contact Ka ₁ is turned on, so the descent low speed operation command relay C is driven, and if the elevator is not located on the 1st floor, the b contact (Kb ₁ ) and the descent low speed of the 1st floor detection relay are driven. The first floor operation command relay B is driven by the b contact Cb ₂ of the operation command relay. When the elevator arrives on the first floor by a known circuit, the descending low speed operation command relay C is driven as described above. , The contact point Ca ₁ is in a self-hold state.

When the door of the elevator is closed in this state, the a contact (Ja ₁ ) of the door closing completion detection relay, the b contact (DLS _B1 ) of the down stop switch (DLS), and the a contact (Ca ₂ ) of the falling low speed operation command relay The buzzer BZ and the solenoid S ₁ for lowering low speed operation are driven by the valve. Therefore, the control valve of the hydraulic control unit 9 of FIG. 1 connected thereto is opened, and the oil contained in the cylinder 5 is transferred to the flow pipe 6 '. ), The stop valve (8) and the flow pipe (6 ") flows into the oil tank (12), so the elevator starts the low speed low speed operation (special operation state, not normal operation) from the ground floor, gradually moving down, The buzzer BZ of FIG. 2 sounds an alarm to signal that one passenger is unavailable.

In this way, when the elevator reaches a certain point, the cam 2 attached to the cage 1 of FIG. 1 drives the lower stop switch DLS installed in the hoistway so that its B contact DLSb ₁ is turned off, and thus the lower speed operation is performed. The solenoid S ₁ is turned off to stop the elevator and stops the alarm sound.

On the other hand, the falling low speed operation command relay (C) of FIG. 2 keeps the driving state, so that the normal operation command relay (D) cannot be driven by its b contact (Cb ₃ ), so that its a contact (Da ₁ ) is Since the known normal operation circuit portion G is blocked and continuously blocked, the elevator continues to stop at the position where the lowering stop switch DLS is operated.

In such a state, when the stop valve 8 of FIG. 1 is dismantled and replaced, and the switch for switching valve SW _{1 of} FIG. _{1 is} connected to the valve replacement completion terminal (a), the low speed low speed operation command relay (C) ) Is turned off and the valve replacement completion detection relay A is driven by its b contact Cb ₁ to contact the a contact Aa ₁ , the falling low speed operation command relay and the b contact of the first floor detection relay K. Since Cb ₄ and Kb ₂ are connected, the rising low speed operation command relay E is driven so that its a contact Ea ₁ is connected to drive the rising low speed operation solenoid S ₂ , and the motor driving relay ( F) is turned on and its a contacts F ₁ and F ₂ are connected to rotate the motor 11 of FIG. 1 so that the pump 10 supplies oil in the oil tank 12 to the cylinder 5. By supplying, the elevator rises at low speed.

At this time, since the valve replacement completion detection relay A is in a driving state, its b contact Ab ₁ remains off, and the normal operation command relay D cannot be driven. It will stop you from invading.

On the other hand, when the elevator rises low speed from the work room and reaches the first floor, the first floor detection relay is driven so that its b contact Kb ₂ turns off the rising low speed operation command relay E. Therefore, the low speed rising operation solenoid ( S ₂ ) is turned off, and the motor driving relay F is not driven so that the contacts a and F ₁ and F ₂ are opened, so the motor 11 is not driven and the elevator stops on the first floor. Done.

In this state, if the switch for switching valve SW _{1 is} connected to the normal operation terminal C, the valve replacement completion relay A is turned off and its b contact Ab ₁ is connected to the normal operation command relay D. ) Is driven so that the contact a (Da ₁ ) thereof is connected, and the known ordinary driving circuit unit (G) operates to switch the elevator to the normal driving state. It is like a flow chart.

The present invention, which operates as described above, connects the valve changeover switch to the valve replacement terminal when the elevator stop valve is replaced, and indicates that the buzzer emits an alarm sound, indicating that it cannot be used, and to a lower work room than the lower floor (1st floor). After the low-speed driving continues to complete the operation to a certain point, the replacement of the stop valve is performed in the state of the least oil in the cylinder, it is easy to replace and reduce the loss of oil to the maximum.

Claims (1)

In the hydraulic elevator, the terminal (a) of the valve changeover switch SW ₁ is connected to the valve replacement complete detection relay A via the b contact Cb ₁ of the falling low speed operation command relay C. Terminal (B) is connected to the 1st floor operation command relay (B) via the b contact (Kb ₁ , Cb ₂ ) of the 1st floor detection relay and the falling low speed operation relay (C) connected in series, and 1st floor detection connected in parallel. Through contact a (Ka ₁ , Ca ₁ ) of the relay and falling low speed operation command relay, it is connected to the falling low speed operation command relay (C), and a contact (Ca ₂ ) of the falling low speed operation relay (C) connected in series, b contact of the fall preventing switch (DLS) (DLSb _1), via a contact point (Ja ₁₎ of the door closing completion detection relay (J) connected to the low-speed driving solenoid (S ₁₎ and a buzzer (BZ) for, and further series via the b-contact (Cb _3, Ab ₁₎ of the descending connection and the low-speed operation command relay valve replacement completion detecting relay The operation command connected to the relay (D), and the series-valve replacement completion detecting a contact of the relay (A) connection (Aa _1), lowering the low speed operation command b contacts of the relay (C) (Cb ₄₎ and the first floor detection relay The rising low speed operation command relay E is connected through the b contact (Kb ₂ ) of the rising low speed operation command relay (E), and the rising low speed operation solenoid (S ₂ ) is connected to the a contact (Ea ₁ ) of the rising low speed operation command relay (E). Operation control circuit at valve replacement in a configured hydraulic elevator.