WO2019030901A1 - Hydraulic elevator renovation method and elevator apparatus - Google Patents

Abstract

According to the present invention, an elevator apparatus that has been renovated is provided with: a hydraulic cylinder that was originally used in a hydraulic elevator apparatus; a linear motor comprising a linear motor secondary conductor housed in the hydraulic cylinder and a primary coil installed above the hydraulic cylinder so as to enclose the secondary conductor; a position control sensor which, by making use of a hollow portion of the hydraulic cylinder, enables position detection in accordance with the position of a cage making an elevating or lowering movement; and a controller which executes position control on the linear motor on the basis of the result of the position detection by the position control sensor.

Description

Method and apparatus for repairing hydraulic elevator

The present invention relates to a method and a device for repairing a hydraulic elevator to which a linear motor drive is applied.

There is a prior art which retrofits an existing hydraulic elevator into the elevator apparatus to which a ball screw drive motor is applied (for example, refer to patent documents 1). Specifically, this patent document 1 removes both a hydraulic cylinder and a plunger from the hoistway 1, for example. And, in Patent Document 1, instead, a ball screw for raising and lowering a car, a nut portion screwed to the ball screw, and a hollow shaft motor capable of rotationally driving the nut portion are arranged in the hoistway.

As a result, according to Patent Document 1, the repair work can be performed such that the car can be moved up and down through the drive of the nut portion and the ball screw accompanying the operation of the hollow shaft motor. Further, Patent Document 1 also discloses a modification method in which a screw rod is formed by processing an existing plunger and forming a thread groove to be screwed to a nut portion of a hollow shaft motor on a circumferential surface of the plunger. There is. Thus, Patent Document 1 realizes the repair work with the installation of relatively few devices.

In addition, there is a prior art of an elevator apparatus to which a linear motor is applied (see, for example, Patent Document 2). Specifically, according to Patent Document 2, a linear motor is accommodated at the center of a counterweight, and the car is moved up and down. Therefore, it is also possible to retrofit an existing hydraulic elevator into an elevator system to which such a linear motor is applied.

JP, 2015-129042, A Unexamined-Japanese-Patent No. 9-255261

However, the prior art has the following problems.
In the case of Patent Document 1, it is necessary to install a ball screw drive motor on the top of the existing plunger and to replace the existing plunger with one having a screw over the entire length. As a result, there is a problem that the repair cost is large and the noise is large.

In addition, Patent Document 2 requires the addition of a counterweight, and also requires a return wheel that connects the counterweight and the basket. Therefore, in order to secure a balance weight space when making a repair, it is necessary to reduce the cage size of the existing elevator, resulting in a large cost. Furthermore, it was impossible in terms of building strength to install a return car against an existing building that does not load the building like a hydraulic elevator.

The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide a method and a device for modifying a hydraulic elevator that realizes an elevator to which a linear motor is applied without reducing the elevator car size. With the goal.

A method of repairing a hydraulic elevator according to the present invention comprises: a hydraulic elevator apparatus comprising: a hydraulic cylinder; and a plunger housed in the hydraulic cylinder and moving up and down the cage of the elevator by vertically moving by hydraulic pressure. The position control system is constructed by installing a position control sensor capable of detecting the position according to the position of the car by removing the plunger and using the hollow portion of the hydraulic cylinder. Step and linear motor consisting of a primary coil and a secondary conductor by replacing and installing the secondary conductor of the linear motor instead of the plunger and installing the primary coil above the hydraulic cylinder so as to surround the secondary conductor And a linear motor drive system construction step for installing a motor, and after Based on the position detection result, and makes it possible perform the position control of the linear motor.

Further, the elevator apparatus according to the present invention is installed above the hydraulic cylinder so as to surround the hydraulic cylinder used in the hydraulic elevator apparatus, the secondary conductor of the linear motor housed in the hydraulic cylinder, and the secondary conductor. Position control sensor that enables position detection according to the position of a basket that performs lifting and lowering operations using a linear motor formed to include a primary coil, and a hollow portion of a hydraulic cylinder, and a position control sensor And a controller that executes position control of the linear motor based on the position detection result by the controller.

According to the present invention, linear motor drive can be realized by attaching a cylindrical linear motor having a primary coil formed above the hydraulic cylinder so as to surround the plunger, and using the sealed space of the cylinder And a configuration that enables accurate position detection. As a result, it is possible to obtain the existing hydraulic elevator repair method and elevator apparatus for realizing the hydraulic elevator repair work without reducing the elevator car size.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram of the elevator apparatus to which the linear motor in Embodiment 1 of this invention is applied. It is a side view of the elevator apparatus to which the linear motor in Embodiment 1 of this invention is applied. It is a whole block diagram of the elevator apparatus to which the linear motor in Embodiment 2 of this invention is applied. It is a side view of the elevator apparatus to which the linear motor in Embodiment 2 of this invention is applied. It is a block diagram which shows the state which the cage landed on the lowest floor from the state of FIG. 4 in Embodiment 2 of this invention. FIG. 5 is an enlarged detail view of part A of FIG. 4 in Embodiment 2 of the present invention. It is the flowchart which showed a series of processing procedures of the repair method of the hydraulic elevator concerning Embodiment 1 and Embodiment 2 of this invention. It is a whole block diagram of the existing direct-connection type hydraulic elevator apparatus. It is a whole block diagram of the existing indirect type hydraulic elevator apparatus.

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the method for repairing a hydraulic elevator and the elevator apparatus according to the present invention will be described below using the drawings. The present invention is to renovate an existing hydraulic drive system to a linear motor drive system, and realize a hydraulic elevator repair work that enables accurate position detection without reducing the elevator car size. It has technical features in its configuration.

Embodiment 1
FIG. 1 is an entire configuration diagram of an elevator apparatus to which a linear motor according to a first embodiment of the present invention is applied. Moreover, FIG. 2 is a side view of the elevator apparatus to which the linear motor in Embodiment 1 of this invention is applied, and shows the cross section of FIG. And these FIG. 1, FIG. 2 has shown the state after remodeling the existing direct-connection type hydraulic elevator into a linear motor drive system.

As shown in FIGS. 1 and 2, in the elevator apparatus according to the first embodiment, a brake 3 and a guiding device 4 are attached to a cage 2 that moves up and down in the hoistway 1. The cage 2 is moved up and down in the hoistway 1 by being guided by the guide device 4 along a guide rail 5 installed in the hoistway 1.

The secondary conductor 8 of the induction linear motor is replaced and installed after removing the plunger of the existing hydraulic jack. Furthermore, the primary coil 7 of the induction linear motor is attached to the upper part of the cylinder 6 of the existing hydraulic jack.

In addition, the controller installed in the control panel 10 operates the newly added brake 3 after modifying the drive system to the linear motor, when performing each floor stop at the time of normal traveling. Specifically, the brake 3 can be configured as a braking mechanism having a gripping portion that grips the guide rail 5 of the car 2. And, by adding such a braking mechanism, it becomes possible to hold the car 2 reliably.

Here, the state before repair will be described with reference to FIG. FIG. 8 is a whole block diagram of the existing direct-connection type hydraulic elevator apparatus. When the elevator apparatus to which the linear motor is applied is repaired with respect to the existing direct-connection type hydraulic elevator apparatus shown in FIG. 8, the states shown in FIGS. 1 and 2 are obtained.

Position control and speed control in the existing hydraulic elevator shown in FIG. 8 are performed using the encoder 21, the lower pulley and weight 22, and the interlocking rope 23. Further, by controlling the control valve 31 installed in the oil tank 30, and the pump and the motor 32, the amount of the working oil 33 in the cylinder 6 is controlled via the pipe 9.

When remodeling from hydraulic system to linear motor drive system, the working oil 33 of the existing hydraulic elevator is removed, and the encoder 21, lower pulley and weight 22, interlocking rope 23, oil tank 30, control valve 31, pump and motor 32 will be removed. As a result, finally, in FIG. 1 and FIG. 2 after the repair, hydraulic related components other than the cylinder 6 and the pipe 9 which are components of the existing hydraulic elevator are removed.

When changing to linear motor driving, as shown in FIG. 2, the laser distance meter 11 or the acceleration sensor is installed on the top of the secondary conductor 8 of the linear motor corresponding to the existing plunger. Specifically, the position control system according to the first embodiment uses the cavity of the secondary conductor 8 of the linear motor and the cavity of the cylinder 6 to extend from the top of the secondary conductor 8 to the lower surface of the cylinder 6 The configuration to measure the distance of is adopted.

With such a configuration, the refurbished elevator apparatus can implement accurate position control using the enclosed space. As a result, it is possible to provide a position control system excellent in maintainability that is not affected by dust, dirt and the like.

By using the laser range finder 11, the velocity can be obtained from the derivative of the change in distance. Therefore, it is possible to perform both position control and speed control using this laser range finder 11. The laser range finder 11 shown in FIG. 2 can also be a range finder using ultrasonic waves or infrared rays.

The elevator apparatus to which the linear motor according to the first embodiment described above is applied can obtain the following effects.
(Effect 1) Realization of cage diversion It is possible to realize a configuration in which a linear motor is applied and the existing cage is diverted in the repair of the existing hydraulic elevator. As a result, the hydraulic elevator can be easily remodeled without reducing the cage size of the existing elevator.

(Effect 2) Realization of a position control system with improved maintainability The existing plunger is changed to a secondary conductor for a linear motor, and a primary coil is formed above the existing hydraulic cylinder so as to surround the plunger. Type linear motor is installed. Furthermore, a position detection configuration is adopted in which the inside of the cylinder or plunger is a detection area.

That is, the elevator apparatus according to the first embodiment can perform position control and speed control of the cage by using reflected light such as laser light and infrared light with the inside of the cylinder and the plunger as a detection area. . As a result, it is possible to realize a position control system excellent in maintainability which is not affected by dust, dirt and the like.

As a variation of the position detection arrangement, it is also possible to install an acceleration sensor instead of the distance meter. Since the velocity can be obtained by integrating the acceleration and the distance can be obtained by integrating the velocity, the use of the acceleration sensor enables both speed control and position control of the car. Such a configuration also makes it possible to use a space that is not affected by dust or dirt.

(Effect 3) Advantages by Adopting a Linear Motor The elevator apparatus according to the first embodiment can apply a linear motor without adopting the configuration of a rope elevator. Therefore, it is not necessary to connect the balance weight, the balance weight and the basket with the return type car by means of a car. As a result, the load on the return car will not be borne by the building side, and it will be possible to repair buildings with restrictions that can not load existing buildings.

Furthermore, the elevator apparatus in the first embodiment does not employ a driving method such as a pole screw. As a result, even when a hydraulic elevator with very little noise and vibration is repaired, the elevator system can be applied without causing the problem of noise and vibration. Moreover, if it is set as a superconducting linear motor drive, an extremely energy saving elevator apparatus can also be provided.

Second Embodiment
In the first embodiment described above, the case where the existing direct-connection type hydraulic elevator apparatus is modified to an elevator apparatus to which a linear motor is applied has been described. On the other hand, in the second embodiment, a case will be described where the existing indirect hydraulic elevator apparatus is modified to an elevator apparatus to which a linear motor is applied.

FIG. 3 is an entire configuration diagram of an elevator apparatus to which a linear motor according to Embodiment 2 of the present invention is applied. Moreover, FIG. 4 is a side view of the elevator apparatus to which the linear motor in Embodiment 2 of this invention is applied, and shows the cross section of FIG. And these FIG. 3, FIG. 4 has shown the state after remodeling the existing indirect type hydraulic elevator into a linear motor drive system.

On the other hand, FIG. 9 is a whole block diagram of the existing indirect type hydraulic elevator apparatus. When the existing indirect type hydraulic elevator apparatus shown in FIG. 9 is repaired to an elevator apparatus to which a permanent magnet synchronous linear motor is applied, the states shown in FIGS. 3 and 4 are obtained.

Therefore, an elevator apparatus to which the linear motor in the second embodiment is applied will be specifically described with reference to the configuration in FIG. 3 and FIG. 4 obtained by performing the modification on the state before the modification in FIG.

As is clear from the comparison between FIG. 8 and FIG. 9, the existing indirect hydraulic elevator apparatus has a slack type safety gear 41 and an operation spring 42 of the slack safety gear with respect to the existing direct connection type hydraulic elevator apparatus. It further comprises a return wheel 43 of the indirect type hydraulic jack, a lifting rope 44 of the indirect type hydraulic jack, and a jack base and lifting rope terminal fixing metal 45.

3, 4, and 9 also show a shock absorber 46 installed at the bottom of the hoistway 1. The shock absorber 46 is provided to reduce the impact of the car 2 colliding with the bottom.

The existing indirect type hydraulic elevator apparatus is configured to be able to indirectly transmit the movement of the plunger 24 that moves up and down by the hydraulic pressure to the cage 2 by providing such a configuration different from the direct connection type. As a result, in the existing indirect hydraulic elevator system, the cylinder 6 of the jack is not buried in the ground, and is accommodated in the hoistway 1.

If the comparison result between the configuration after the repair shown in FIG. 3 and FIG. 4 and the configuration before the repair shown in FIG. 9 is organized, in order to obtain the elevator apparatus after the repair applying the linear motor, The same repair work as in mode 1 will be carried out.

Furthermore, in the second embodiment, since the existing device is an indirect hydraulic elevator, the cylinder 6 of the jack is not buried in the ground, and is accommodated in the hoistway 1. Therefore, in the second embodiment, the position detection control system can be constructed as follows.

Specifically, as shown in FIG. 3 and FIG. 4, in the second embodiment, the light emitting unit 12 for position detection is installed under the secondary conductor 8, and further, for position detection under the cylinder 6. The light receiving unit 13 is installed. As described above, the position control sensor according to the second embodiment is configured by arranging the position detection light emitting unit 12 and the position detection light receiving unit 13 to be opposite to each other. More specifically, the position control system in the second embodiment adopts a configuration that measures the distance from the lowermost portion of secondary conductor 8 to the lower surface of cylinder 6 using the hollow portion of cylinder 6. There is.

With such a configuration as well, as in the first embodiment, a position control system using a sealed space can be realized. As a result, it is possible to provide a position control system excellent in maintainability that is not affected by dust, dirt and the like. Incidentally, also when repairing the existing indirect hydraulic elevator apparatus in the second embodiment, it is also possible to use an acceleration sensor as a position control sensor.

Further, the wiring from the position detection light receiving unit 13 to the control board 10 can be configured to pass through the existing pipe 9. As a result, new installation of piping and wiring ducts becomes unnecessary.

On the other hand, power supply to the position detection light emitting unit 12 will be described with reference to FIGS. 5 and 6. FIG. 5: is a block diagram which shows the state which the cage landed on the lowest floor from the state of FIG. 4 in Embodiment 2 of this invention. 6 is an enlarged detail view of a portion A of FIG. 4 in the second embodiment of the present invention.

The battery 14 and the plate spring 15 are fixed to the upper portion of the primary coil 7 by a fixing bolt 16. The power supply to the position detection light emitting unit 12 through the power supply line 12 a can be performed from the battery 14. Further, the power supply to the battery 29 can be performed from the power supply source installed on the upper part of the primary coil 7 via the leaf spring 15 when the car 2 stops at the lower floor.

Therefore, in the second embodiment, when employing the light emitting unit 12 for position detection and the light receiving unit 13 for position detection, it is not necessary to wire power supply over the entire length, and an inexpensive configuration can be realized. .

As described above, the elevator apparatus to which the linear motor in the second embodiment is applied is the same as the case where the existing hydraulic elevator apparatus is the direct connection type even when the existing hydraulic elevator apparatus is the indirect type, The effects 1 to 3 described in the first embodiment can be obtained.

Furthermore, in the second embodiment, the following effect 4 can be obtained.
(Effect 4) Unique effect when the existing elevator is an indirect type hydraulic elevator The existing cylinder not buried in the ground is diverted, and the position detection light emitter and the position detection light receiver are installed in this cylinder Then, a position detection control system can be constructed.

In addition, when the car is stopped at the lower floor, power can be supplied from the battery to the position detection light emitting unit. Furthermore, wiring from the position detection light receiving unit to the control panel can be performed by diverting the existing hydraulic piping. As a result, it becomes possible to provide a position control system of the cage with an inexpensive configuration without requiring new installation of a wiring duct or the like.

Finally, a method of repairing a hydraulic elevator that summarizes the contents of the above-described first embodiment and second embodiment will be described using a flowchart. FIG. 7 is a flowchart showing a series of processing procedures of the method of repairing a hydraulic elevator according to Embodiment 1 and Embodiment 2 of the present invention.

First, at step 701, the existing equipment is removed. Specifically, as described in the first and second embodiments, removal work of hydraulic devices other than the cylinder 6 and the pipe 9, and the encoder 21, the lower pulley and weight 22, and the interlocking rope 23 which are position detection mechanisms Is done.

Next, in step S702, when the hydraulic elevator is repaired to a linear motor drive elevator, a mounting operation of a sensor used for position control is performed. Specifically, in the case where the distance meter 11 described in Embodiment 1 is used as a position control sensor, the distance meter 11 is installed at the top of the hollow portion of the secondary conductor of the linear motor.

When the position detecting light emitting unit 12 and the position detecting light receiving unit 13 described in the second embodiment are used as position control sensors, the position detecting light emitting unit 12 is provided below the secondary conductor of the linear motor. The position detection light receiving unit 13 is installed below the cylinder 6.

In addition to the installation of the position control sensor, the installation work and the wiring work of the devices necessary for reading the detection result of the position control sensor by the controller in the control panel 10 are performed. The work of these steps S701 and S702 corresponds to the preparatory step.

In addition, the work which adds the brake 3 which is a braking mechanism under the cage 2 will also be implemented in the preparatory step of repair work.

Next, at step S703, construction work of a linear motor drive system is performed. Specifically, the secondary conductor 8 of the linear motor is replaced and installed instead of the removed plunger 24, and the primary coil 7 is installed above the existing cylinder 6 so as to surround the secondary conductor 8. As a result, a linear motor drive system having a primary coil and a secondary conductor can be constructed.

By performing the series of repair work, it is possible to construct an elevator apparatus after repair corresponding to the first embodiment or the second embodiment.

1 shaft, 2 car, 3 brake, 4 guide device, 5 guide rail, 6 cylinder of hydraulic jack of existing hydraulic elevator, 7 primary coil of linear motor, 8 secondary conductor of linear motor, 9 piping of existing hydraulic elevator, Reference Signs List 10 control panel 11 sensor for position control (laser distance meter, acceleration sensor) 12 light emitting unit for position detection 12a wiring 13 light receiving unit for position detection 13a wiring 14 battery 15 leaf spring 16 fixing bolt 41 Slack-type safety device, 42 Operating spring of the slack-type safety device, 43 Inverted hydraulic jack return wheel, 44 Lifting rope, 45 Jack base and lifting rope end fixed metal, 46 Shock absorber.

Claims (5)

A hydraulic elevator repair method for repairing a hydraulic elevator system including a hydraulic cylinder and a plunger housed in the hydraulic cylinder and moving up and down the cage of the elevator by moving up and down by hydraulic pressure to a linear motor type elevator system. ,
A position control system construction step of removing the plunger and installing a position control sensor that enables position detection in accordance with the cage position using the hollow portion of the hydraulic cylinder;
A secondary coil of a linear motor is replaced and installed instead of the plunger, and a primary coil is installed above the hydraulic cylinder so as to surround the secondary conductor, thereby comprising the primary coil and the secondary conductor And a linear motor drive system construction step for installing a linear motor
The repair method of the hydraulic elevator which enables execution of position control of the said linear motor based on the position detection result by the said sensor for position control after repair. A hydraulic cylinder used in a hydraulic elevator system;
A linear motor formed to include a secondary conductor of a linear motor housed in the hydraulic cylinder, and a primary coil disposed above the hydraulic cylinder so as to surround the secondary conductor;
A position control sensor that enables position detection in accordance with the position of a car performing an elevation operation using the hollow portion of the hydraulic cylinder;
An elevator apparatus comprising: a controller that executes position control of the linear motor based on a position detection result by the position control sensor. The position control sensor is disposed at the top of the hollow portion of the secondary conductor, and includes a sensor that measures the distance to the lower surface of the hydraulic cylinder, or a sensor that detects an acceleration accompanying the movement of the secondary conductor. The elevator apparatus according to claim 2. The position control sensor includes a light emitting unit disposed below the secondary conductor, and a light receiving unit disposed below the hydraulic cylinder so as to face the light emitting unit, and the light emitting unit The elevator apparatus according to claim 2, wherein a distance between a unit and the light receiving unit is measured. It further comprises a braking mechanism installed in the basket and gripping a guide rail of the basket, and braking the lifting and lowering of the basket.
The elevator apparatus according to any one of claims 2 to 4, wherein the controller brakes lifting and lowering of the cage by the braking mechanism when the cage is stopped.

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