JP3400937B2 - Escalator low-speed operation device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an escalator low-speed operation apparatus for operating an escalator at a low speed by operating an AC drive motor driven by a main power supply circuit at a low speed in an emergency. . Conventionally, when it is necessary to operate an escalator at a low speed for the sake of work or the like, an operator operates the handwheel by turns to operate the escalator at a low speed. The work efficiency was poor and the operation speed was very limited. Therefore, 52-37
In Japanese Patent No. 589, a small electric motor having a built-in reduction gear is connected to the rotating shaft of an AC drive electric motor of an escalator, and when it is necessary to operate the escalator at a low speed, the escalator is driven by the small electric motor at a low speed. A driving device has been proposed. [0003] However, in the conventional low-speed operation device of the escalator, when the ascending operation button or the descending operation button is pressed during the low-speed operation, the main contact of the main power circuit of the AC drive motor is turned off. The AC drive motor is put into a normal operation state by closing the circuit, and the small motor is heavy and difficult to handle. It is an object of the present invention to provide a low-speed operation device for an escalator which can easily maintain a low-speed operation state. In order to achieve the above object, the present invention provides an AC power supply, a contact for selecting an ascending operation and a descending operation of an escalator, and a main contact for supplying the AC power when the circuit is closed. Connection of AC drive motor, star connection or three
An escalator configured to include a main power supply circuit including a contact for switching to one of the square connections and a control circuit for controlling the opening and closing of each contact, and operating the AC drive motor at a low speed to operate the escalator at a low speed; In the low-speed operation device, a low-speed operation power supply circuit is connected in parallel with the main contact at the time of low-speed operation, and the main circuit prohibits the control circuit from closing the main contact when the low-speed operation power supply circuit is connected. The connection between the contact input circuit and the AC drive motor
Fixed to the type connection circuit to prevent connection switching to the triangle connection circuit
Thus, a switching prohibiting means for prohibiting the operation of the contact is provided. As described above, the low-speed operation device of the escalator according to the present invention connects the low-speed operation power supply circuit and cuts off the main contact input coil circuit of the main contact to inhibit the main contact from being turned on. Because the circuit is provided, the main contact does not close even if the ascending operation button or the descending operation button is pressed as in the past, and AC power from the AC power supply is supplied and the AC drive motor operates normally. There is no. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram illustrating a low-speed operation of a low-speed operation device of an escalator according to an embodiment of the present invention. The AC power supply 4 is connected to a transformer 13 via a switch 11 for interrupting the supply of electricity to the escalator device 1, and the single-phase AC power whose voltage has been converted by the transformer 13 is converted to DC power by a rectifier circuit 14. Then, the electromagnetic brake 15 is excited by this DC power to release the braking state of the escalator. The AC power converted by the transformer 13 is supplied to a control circuit 1 for operating the escalator device 1.
The control circuit 16 includes a safety circuit 161 that opens in an emergency, a rising operation circuit 162,
A descent operation circuit 163, a main contact input circuit 164, a triangular connection circuit 165, a star connection circuit 166, and a connection switching timed circuit 167 are provided. During the low-speed operation of the escalator, a low-speed driving device 2 is connected to the escalator device 1. The low-speed driving device 2 includes an inverter device that converts AC power into DC power and then converts it back into AC power. A low-speed operation power supply circuit 21 is provided and connected by connectors C1-1 and C1-2. On the other hand, at the time of normal operation, a low-speed operation operation invalidation circuit 20 is connected to the escalator device 1 instead of the low-speed operation drive device 2 as shown in FIG. During normal operation, AC power is supplied to an AC drive motor 1
In the main power supply system leading to M, an ascending contact UP and a descending contact DN for selecting the ascending operation or the descending operation are connected to the output side of the switch 11, and the outputs of the ascending contact UP and the descending contact DN. The main contact DRV that is closed during normal operation is connected to the side, and the AC drive motor IM is connected to the output side of the main contact DRV. Further, a star connection contact SC and a triangular connection contact DC are connected to the other side of the AC drive motor IM. On the other side of the star connection contact SC, the respective lines are short-circuited. The other side of the connection contact DC is connected to the output side of the main contact DRV. A rectifier circuit 14 is connected to the output side of the transformer 13,
On the output side of the rectifier circuit 14, a parallel circuit of the normally open preliminary contact UPa5 of the ascending closing coil UPC and the normally open preliminary contact DNa5 of the descending closing coil DNC, the normally open preliminary contact UPa6 of the ascending closing coil UPC, and the descending closing coil DNC The electromagnetic brake 15 is connected via a parallel circuit of the normally open preliminary contacts DNa6. The specific configuration of the control circuit 16 will be described. The ascending operation circuit 162 connected to the output side of the transformer 13 via the safety circuit 161 is pressed and closed during the ascending operation. And the descending input coil D
It is composed of a series circuit including a normally closed preliminary contact DNb1 of the NC and an ascending contact coil UPC of the ascending contact UP. The descending operation circuit 163 includes a descending operation button SDN pressed and closed at the time of descending operation, and an ascending contact. The series circuit includes a normally closed preliminary contact UPb1 of the coil UPC and a descending closing coil DNC of the descending contact DN. The main contact closing circuit 164 includes a normally open preliminary contact UPa1 of the ascending closing coil UPC and a normally open preliminary contact DN of the descending closing coil DNC.
a1 and a series circuit composed of terminals A and B and a main contact input coil DRVC of the main contact DRV. The escalator device 1 is connected between the terminals A and B.
In the state where the low-speed operation drive device 2 shown in FIG. 1 is connected, the circuit is cut off and opened between the connectors C1-1 and C1-2,
When the low-speed operation operation invalidating circuit 20 shown in FIG. 2 is connected to the escalator device 1, the connectors C1-1 and C2-2 are connected.
Are connected and closed. The triangular connection circuit 165 includes a normally open preliminary contact DRVa1 of the main contact closing coil DRVC, a normally open timed contact 1Ta2 of the timed contact making coil 1T, a normally open timed contact 2Ta1 of the timed contact making coil 2T, It is configured by a series circuit of a normally closed preliminary contact SCb1 of the star connection input coil SCC and a triangular connection input coil DCC. The star-shaped connection circuit 166 includes a parallel circuit of the normally closed timed contact 1Tb1 of the timed contact making coil 1T and the normally closed preliminary contact DRVb1 of the main contact making coil DRVC, the normally open preliminary contact UPa2 of the ascending closing coil UPC, and the descending closing. A parallel circuit of the coil DNC and the normally open preliminary contact DNa2, and a triangular connection closing coil DC
C, normally closed auxiliary contact DCb1, and star connection closing coil SC
C and a series circuit. The connection switching time-limiting circuit 167 is connected in parallel with a series circuit in which the time-limiting contact input coil 1T is connected in series to the normally open preliminary contact UPa3 of the ascending input coil UPC and the normally open preliminary contact DNa3 of the descending input coil DNC connected in parallel. A normally open preliminary contact UPa3 of the ascending closing coil UPC and a normally open preliminary contact DNa3 of the descending closing coil DNC, a normally open timed contact 1Ta1 of the timed contact making coil 1T, and a series circuit in which the timed contact making coil 2T is connected in series. It is configured. The above-mentioned normally open timed contact 1T
a1 and 1Ta2 are closed n1 seconds after the timed contact making coil 1T is excited, and the normally closed timed contact 1Tb2 is opened n1 seconds after the timed contact making coil 1T is excited. Similarly, the normally open timed contact 2Ta1 closes n2 seconds after the timed contact closing coil 2T is excited. With such a configuration, when the low-speed driving device 2 is attached to the escalator device 1 during low-speed operation as shown in FIG. 1, the connectors C1-1 and C1-2 are connected.
, The low-speed operation power supply circuit 21 is connected. The AC power of the AC power supply 4 is supplied to the low-speed operation power supply circuit 21 via the connectors C1-1 and C1-2, and is output from the low-speed operation power supply circuit 21. AC power is supplied to connectors C1-2 and C1.
-1 is supplied to the AC drive motor IM, so that the AC drive motor IM can be operated at a low speed.
At this time, the normally open preliminary contacts UPa7 and DN connected to the low-speed operation power supply circuit 21 via the connectors C1-1 and C1-2.
a7 is closed, the low-speed operation power supply circuit 21
Is given a low-speed operation direction command. At this time, the connection between the terminals A and B of the main contact input circuit 64 is cut off by the connector C1-2 to be in an open state, and the main contact input coil DRVC is not excited. The contact DRV is turned on and the low-speed operation power supply circuit 21
The low-speed operation of the AC drive motor IM via the motor is not prevented. On the other hand, when the escalator is operated normally, the low-speed operation driving device 2 is removed and the closing prohibition operation invalidation circuit 20 is attached to the escalator device 1 as shown in FIG. Then, the main power supply system of the AC drive motor IM is in a state where it can be energized. Then, when the driver presses the ascending operation button SUP of the ascending operation circuit 162 of the control circuit 16, a safety circuit 161... Ascending operation button SUP... Normally closed preliminary contact DNb1. Ascending input coil UPC
Is excited. By this excitation, the ascending closing coil UPC
The normally open preliminary contacts UPa1 to UPa7 are closed, and the normally closed preliminary contact DNb1 is closed. Since the terminals A and B are short-circuited by the closing prohibition operation invalidating circuit 20 attached via the connector C2-2, the normally open preliminary contact UPa1 is provided.
Is closed, the safety circuit 161 of the control circuit 16 is closed.
... normally open preliminary contact UPa1 ... terminals A and B ... A series circuit of the main contact making coil DRVC is formed, and the main contact making coil DRVC is excited. The excitation of the main contact input coil DRVC causes the main contact DR of the main power supply system to be turned on.
VC is turned on. The normally open preliminary contact UPa2 is closed by the excitation of the ascending closing coil UPC, so that the safety circuit 161... The normally closed timed contact 1Tb of the star connection circuit 166 is closed.
1 ... normally open preliminary contact UPa2 ... normally closed preliminary contact DCb1
…… A series circuit of the star connection input coil SCC is formed,
The star connection contact SC is turned on by the excitation of the star connection input coil SCC. Therefore, the main power supply system is
... contact UP ... The series circuit of the main contact DRV is closed, and AC power is supplied to the AC drive motor IM in a star connection state. On the other hand, the normally open preliminary contact UPa connected to the output side of the rectifier circuit 14 by excitation of the ascending closing coil UPC
5, when the UPa 6 is closed, the DC power from the rectifier circuit 14 is supplied to the electromagnetic brake 15, the electromagnetic brake 15 is excited, the braking state of the escalator is released, and the rising operation of the escalator starts. Further, in the connection switching timed circuit 167, when the ascending coil UPC is excited, U
Pa3 is closed, and the timed contact closing coil 1T is excited. However, for the next n1 seconds, the normally closed timed contact 1Tb1
Keeps the closed state, the star connection contact SC is turned on and the AC drive motor IM is operated in the star connection state. However, the normally closed timed contact 1Tb1 opens after n1 seconds, and Circuit 161... The star connection circuit 166 is opened, the star connection input coil SCC is demagnetized, and the star connection contact SC is cut off. However, when the star-shaped contact SC is cut off and the timed contact closing coil 1T of the connection switching timed circuit 167 is excited to close the normally closed timed contact 1Ta1,
Since the normally open timed contact 2Ta1 remains open for n2 seconds after the timed contact closing coil 2T is excited, the triangular connection contact DC is not turned on, and the winding of the AC drive motor IM is released to enter an inertial operation state. But timed contact closing coil 2
After n2 seconds from the excitation of T, the normally closed timed contact 2Ta1 of the triangular connection circuit 165 is closed. Therefore, the safety circuit 161... Normally open preliminary contact DRVa1.
Ta2: normally open timed contact 2Ta1: normally closed spare contact SC
b1 A series circuit of the triangular connection input coil DCC is formed, and the triangular connection input coil DCC is excited to turn on the triangular connection contact DC. Thereafter, the AC drive motor IM is normally operated in the triangular connection state. Even when the driver closes the circuit by pressing the descent operation button SDN of the descent operation circuit 163, the main power supply system includes the switch 11 ... the contact DN ... the main contact DRV ... the series of the AC drive motor IM. A circuit is formed and the AC drive motor IM
Is supplied with AC power, and the star connection contact SC is similarly turned on by opening and closing its contacts by exciting each coil. At this time, a safety circuit 161... A down operation button SND... A normally closed preliminary contact UPb1.
Since the NC circuit is formed and the descending closing coil DNC is excited, the normally closed preliminary contacts NDa5 and DNa6 are closed, and the electromagnetic brake 15 excited by the DC power supplied from the rectifier circuit 14 causes the escalator to brake. Is released, and the descending operation of the escalator starts. When a safety device (not shown) of the escalator device 1 is operated during normal operation, the normally closed contact of the safety circuit 161 of the control circuit 16 is opened, and the ascending operation circuit 16 is opened.
2. Lowering operation circuit 163 and main contact input circuit 164
Supply of AC power to the parallel circuit is interrupted, and the ascending input coil UPC, the descending input coil DNC, and the main contact input coil DRVC are demagnetized. As a result, the main contact DRV
And the normally open preliminary contacts UPa5, UPa6 or normally open preliminary contacts DNa5, DNa6 are opened and the AC drive motor IM
The supply of AC power to the escalator is stopped, and the electromagnetic brake 15 is demagnetized to put the escalator into a braking state and to make an emergency stop. Next, the case where the escalator is operated at a low speed will be described. First, the driver shuts off the switch 11, removes the normal operation device 20 from the escalator device 1, and replaces it with the low-speed operation drive device 2 shown in FIG. Thereafter, the switch 11 is turned on to supply the AC power from the AC power supply 4 to the output side. When the ascending operation button SUP of the escalator device 1 is pressed, the safety circuit 161...
UP: normally closed preliminary contact DNb1: ascending closing coil UP
The series circuit of C is closed, the ascending closing coil UPC is excited, and the normally open preliminary contacts UPa1 to UPa7 are closed. However, there is a connector C between the terminals A and B of the main contact input circuit 164.
Although connected to 1-1, the low-speed operation driving device 2
Since the connecting device C1-2 has no terminal to be connected and is in a cutoff state, the normally open preliminary contact UPa1 is closed but the terminals A and B are disconnected, and the main contact closing coil DRVC is not excited. Therefore, the main contact DRV remains open, and the AC power from the AC power supply 4 is
Not supplied to M. On the other hand, when the normally open preliminary contact UPa7 is closed by excitation of the ascending closing coil UPC, an ascending operation command is given to the low-speed operation power supply circuit 21, and the output side of the low-speed operation power supply circuit 21 causes the AC drive motor IM to perform ascending and low-speed operation. AC power is output, and the connectors C1-1 and C1-
2 to the AC drive motor 1M. When the normally open preliminary contact UPa2 of the star connection circuit 166 is closed, the normally closed timed contact 1Tb1 is closed.
… Normal open preliminary contact UPa2… Normal closed preliminary contact DCb1…
... A series circuit of the star connection input coil SCC is formed, the connection for exciting the star connection input coil SCC, the star connection contact SC is turned on, and the AC drive motor IM is in a star connection state. Also, the normally open preliminary contacts UPa5 and UPa6 connected to the output side of the rectifier circuit 14 are closed, so that the DC power from the rectifier circuit 14 is supplied to the electromagnetic brake 15, the electromagnetic brake 15 is excited, and the escalator is in the braking state. And the low speed operation starts. In this low-speed operation, the main contact closing coil DRVC is always shut off by opening between the terminals A and B, and the low-speed operation circuit is connected in parallel with the normally closed preliminary contact 1Tb1 of the star connection circuit 166. Since the normally closed auxiliary contact DRVb1 of a certain main contact DRV is connected and the switching inhibition means for inhibiting the switching of the connection of the AC drive motor IM is constituted by these, the star connection input coil SCC opens and closes the normally closed auxiliary contact 1Tb1. Regardless, it continues to be introduced. Further, since the normally open preliminary contact DRVa1 is connected in series to the triangular connection making coil DCC of the triangular connection circuit 165, the triangular connection making coil DCC is not turned on by the normally open preliminary contact DRVa1 holding the normally open state. Therefore, at the time of low-speed operation, the connection of the AC drive motor IM can be fixed to the star-type connection having a smaller exciting current than the triangular connection by the switching prohibiting means, so that the low-speed operation power supply circuit 21 has a small capacity and can be downsized. . Also, when the escalator performs a low-speed descent operation, the operation is substantially the same as the above-described low-speed ascend operation. As described above, the low-speed operation drive device 2 is connected to the escalator device 1 for low-speed operation, and the main contact DR
Since the main contact input coil DRVC of V cannot be excited, the main contact DRV remains open even if the up operation button SUP or the down operation button SDN is pressed, and the AC drive motor IM AC power is not supplied and the AC drive motor IM does not operate normally. On the other hand, even when the escalator operates at low speed, the safety circuit 161 is always supplied with single-phase AC power from the transformer 13 and is in an operable state. When the safety device operates,
The supply of AC power to the parallel circuit of the ascending operation circuit 162, the descending operation circuit 163, and the main contact inputting circuit 164 is cut off, the supply of AC power to the AC drive motor IM is cut off, and the electromagnetic brake 15 is turned off. The escalator is brought into a braking state by degaussing, and the escalator stops in an emergency. As described above, the low-speed operation device of the escalator according to the present invention connects the low-speed operation power supply circuit in parallel with the main contact and prevents the main contact from closing during low-speed operation. Since the main contact input circuit is provided, the main contact does not close even if the ascending operation button or the descending operation button is pressed as in the conventional case, AC power is supplied from the AC power supply, and the AC drive motor is normal. Without being driven, low-speed operation can be easily maintained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a low-speed operation of an escalator low-speed operation device according to an embodiment of the present invention. FIG. 2 is a circuit diagram showing a normal operation in a low-speed operation device of the escalator shown in FIG. 1; [Description of Signs] 1 Escalator device 2 Low-speed operation drive device 4 AC power supply 15 Electromagnetic brake 16 Control circuit 20 Low-speed operation operation invalidation circuit 21 Low-speed operation power supply circuit 161 Safety circuit 162 Up operation circuit 163 Down operation circuit 164 Main contact input circuit 165 Triangular connection 166 Star connection circuit 167 Connection switching timed circuit IM AC drive motor DC Triangular connection contact DCC Triangular connection closing coil DN Descending contact DRV Main contact DRVC Main contact closing coil SC Star connection contact SCC Star Type connection UP Ascending contact

Continued on the front page (72) Inventor Shizuo Nishikawa 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo Inside Hitachi Building System Co., Ltd. (72) Inventor Noboru 5-23-14 Ueno, Taito-ku, Tokyo Hitachi Building System Co., Ltd. East Kanto branch office (56) References JP-A-8-310777 (JP, A) JP-A-57-180580 (JP, A) JP-A-49-132780 (JP, A) Jpn. , U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B66B 31/00

Claims (1)

(57) [Claim 1] AC power supply, a contact for selecting up operation and down operation of the escalator, a main contact for supplying the AC power when the circuit is closed , an AC drive motor Is the star connection
An escalator configured to include a main power supply circuit including a contact for switching to one of the triangular connections, and a control circuit for controlling the opening and closing of each contact, and operating the AC drive motor at a low speed to operate the escalator at a low speed; In the low-speed operation device, a low-speed operation power supply circuit is connected in parallel with the main contact at the time of low-speed operation, and the main circuit prohibits the control circuit from closing the main contact when the low-speed operation power supply circuit is connected. A star-shaped connection between the contact input circuit and the AC drive motor
Fix the circuit and prevent the connection switching to the triangular connection circuit.
A low-speed operation device for an escalator, comprising a switching prohibition unit for prohibiting the operation of the contact .