JPH07137994A - Parallel movement adjustment method by hydraulic jack - Google Patents

Abstract

PURPOSE:To enable parallel movement to be carried out accurately and rapidly by measuring a movable distance of a heavy cargo such as turbine casings, etc., of power plant from a foundation a length measuring machine and, when a movement deviation by its maximum and minimum values exceeds a set range, adjusting the movable distance by solenoid valves. CONSTITUTION:To move an upper turbine casing 1 from a lower turbine casing 2 as a foundation, multiple hydraulic jacks 3 (3a, 3b,...) are installed on the upper turbine casing 1. Also rotary encoders 6 (6a, 6b,...) measuring a movable distance between the both casings 1 and 2 are installed in the both casings 1 and 2 to correspond to respective hydraulic jacks 3. Then the upper casing 1 is moved from the lower casing 2 by the interlocked operation of the hydraulic jacks 3. In this case, the movable distance is measured by the rotary encoders 6, and the movement deviation is obtained by a hydraulic control device 12. When the movement deviation exceeds a set limit, the solenoid valves installed in its high pressure circuits are turned on and off to adjust the movable distance of the both casings 1 and 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel movement adjusting method for moving a heavy load such as a turbine casing of a power plant from a foundation to a predetermined position with a hydraulic jack.

[0002]

2. Description of the Related Art Hydraulic jacks are widely used for moving heavy objects horizontally or vertically. Generally, when a plurality of hydraulic jacks are used for jacking up a heavy object as described above, it is necessary to drive the hydraulic jacks in synchronization so that the heavy object is not tilted.

Conventionally, when the hydraulic jacks are driven in synchronization with each other, a potentiometer is provided for each hydraulic jack to detect the expansion / contraction position, and the expansion / contraction position of each hydraulic jack is adjusted by feedback control of the expansion / contraction position. ing.

In this case, a tuning transmitter such as a potentiometer is attached to a position different from a moving device such as a hydraulic jack for moving a heavy object, and the moving device is controlled while checking the parallelism of the moving heavy object. It is known (Japanese Patent Laid-Open No. 52-123064). However, in the position control method as described above, detection errors and the like may be added and accumulated, and the heavy object may be inclined.

Japanese Unexamined Patent Publication (Kokai) No. 2-178198 proposes a control method for preventing the inclination of heavy objects as described above. Here, for each hydraulic jack, ΔH at every ΔT time
Giving stepwise position command increases or decreases by, and feedback control by detecting the expansion and contraction position of each hydraulic jack, during the first △ T ₁ of _{△ T (= △ T 1 +} △ T 2), each Extend or contract the hydraulic jack, check the inclination of the heavy object during the remaining ΔT ₂ , and if there is no inclination, raise or lower the next step. Correction control is performed.

In the tilt correction control, one of the respective hydraulic jacks is used as a reference jack, the deviation amount of the other hydraulic jacks with respect to the reference jack is obtained by the controller, and the position of each of the other hydraulic jacks is controlled based on this deviation amount. Do it.

[0007]

When removing a heavy object such as the upper turbine casing of a power plant, loosen the bolts for joining the foundation and move the heavy object in parallel to a predetermined position with a plurality of hydraulic jacks. After that, it is hung by a crane and transported.

Here, accurate and rapid translation is required. In order to be accurate, if it is too careful and lacking in speed, it will affect the next process, and in the case of being inaccurate without being careful, it will cause damage to the turbine casing etc. due to welding bolts, etc. Affects subsequent treatment.

However, the above-mentioned Japanese Laid-Open Patent Publication No. 2-178.
When the hydraulic jack control method as described in Japanese Patent Publication No. 198 is used for removing a heavy object such as an upper turbine casing of a power plant, there are the following problems.

In the tilt correction control according to the present technology, one of the hydraulic jacks is used as a reference jack, a deviation amount of another hydraulic jack with respect to the reference jack is calculated by a controller, and the other hydraulic jacks are respectively determined based on the deviation amount. The inclination is corrected. Therefore, as the number of hydraulic jacks increases, the amount of deviation from the reference jacks with respect to those hydraulic jacks also increases, resulting in complicated position control.

Here, since the inclination correction control is performed for the deviation amount from all the other hydraulic jacks with respect to the reference jack during ΔT ₂ , it is accurate, but it takes time to shift to the next step. .

The present invention has been made to solve the above-mentioned problems, and even when a heavy object such as a plurality of hydraulic jacks is jacked up, the operation is easy and the translation can be performed accurately and quickly. An object of the present invention is to provide a parallel movement adjusting method using a hydraulic jack.

[0013]

In order to achieve the above object, the present invention provides a heavy load with a plurality of hydraulic jacks, and when the heavy load is translated from the base, the heavy load and the base are provided. , A length measuring device for measuring the moving distance of each of the hydraulic jacks is attached to each hydraulic jack, and the hydraulic jack is set in a low-voltage circuit so that the straw of the length measuring device is set to zero, and then the high pressure of the hydraulic jack is increased. When a heavy object is moved in parallel from the foundation by a linked operation by the circuit, the distance traveled from the foundation of the heavy object is measured by the length measuring device, and when the deviation due to the maximum value and the minimum value exceeds the set range. A parallel movement adjusting method using a hydraulic jack is characterized in that a moving distance between a heavy object and a foundation is adjusted by a solenoid valve provided in each of the high voltage circuits.

The present invention is directed to a case where a plurality of hydraulic jacks are attached to a heavy object and the heavy object is translated from the foundation. The reason for mounting a plurality of hydraulic jacks is that a relatively large heavy object is targeted. When jacking up a heavy object, if the heavy object is cylindrical, at least three hydraulic jacks should be used. Preferably, stable jack-up can be performed. The number can be increased appropriately as the size of heavy objects increases. Also, when jacking up a square heavy object, it is possible to attach four or six hydraulic jacks in opposition to each other for stable jacking up.

In the present invention, a length measuring device for measuring the moving distance by jacking up is attached to a heavy object and a foundation in correspondence with each hydraulic jack. This is to measure the moving distance between the heavy object and the foundation for each hydraulic jack. With this, it is possible to know the relative movement distance between the heavy object and the foundation that require parallel movement by each hydraulic jack.

Before the jack-up, the hydraulic jack is set in a low pressure circuit, that is, at a pressure that does not lift the heavy object, and the stroke of the length measuring device is set to zero. It is grounded to eliminate errors when jacking up. In that state, the straw of the length measuring device is set to the zero point and the length is measured after that, so the accuracy is high. Here, the heavy object and the foundation are moved in parallel regardless of horizontal or vertical.

In the present invention, the moving distance from the foundation of the heavy object is measured by the length measuring device, and when the moving deviation due to the maximum value and the minimum value exceeds the set range, the solenoid valves provided in the high voltage circuits respectively are used. It is necessary to adjust the moving distance between the heavy object and the foundation. Here, a rotary encoder is practical as a length measuring device, and it can be easily attached to and detached from a heavy object and a foundation by a magnet or the like.

The movement distance is adjusted as follows. When multiple hydraulic jacks are jacked up and the moving distance from the foundation of a heavy object is measured, the moving deviation due to the maximum and minimum values is calculated, and when the moving deviation exceeds the set range, the maximum When the hydraulic jack of the moving distance of the value is stopped and the hydraulic jack of the moving distance of the minimum value is jacked up to the moving distance, the stopped hydraulic jack is moved again and adjusted.

In this case, the hydraulic jacks other than the hydraulic jacks having the maximum and minimum moving distances are within the set range, so either jack up as is, or stop when the maximum moving distance is reached, and then stop. When the hydraulic jack of the moving distance of the value is jacked up to the moving distance of the maximum value, the stopped hydraulic jack can be moved again and adjusted.

The above adjustment is performed by solenoid valves provided in the high-voltage circuit. The reason why the solenoid valve is limited is that the solenoid valve can be controlled “ON” and “OFF” and can be adjusted quickly.

According to the present invention, the movement deviation based on the maximum value and the minimum value of the length measurement value is obtained, and when the movement deviation exceeds the set range, adjustment is made by the solenoid valve, so that the operation is easy, accurate and quick. Can be translated.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a rotary encoder and a hydraulic jack device used in the present invention, and a jack-up of an upper turbine casing by a control device for the hydraulic jack.

In FIG. 1, a plurality of hydraulic jacks 3a, 3b (3c, 3d) are attached to the upper turbine casing 1, and when the upper turbine casing 1 is moved from the lower turbine casing 2 serving as a base, the upper turbine casing is moved. The rotary encoders 6a, 6b, (6c, 6d) for measuring the moving distance between the chamber 1 and the lower turbine casing 2 are attached in correspondence with the hydraulic jacks 3a, 3b, (3c, 3d). Tools 7a, 7b, (7c, 7d) and fixtures 8a, 8b, (8
c, 8d), hydraulic jacks 3a, 3b,
(3c, 3d) is connected to the hydraulic control device 12. The reference numerals in the parentheses are hidden in the upper turbine casing 1 and are not shown in FIG. Reference numeral 21 is a hydraulic hose, and 22 is an encoder cable.

FIG. 2 is an enlarged view of a main part showing a state before jacking up in FIG. Here, the hydraulic jack 3a mounted between the fixture 7a and the fixture 8a is in a state in which the rod 4a of the hydraulic jack 3a is housed in the cylinder 5a and contracted before being jacked up. The rotary encoder 6a includes a main body 11a and a stator 10a.
And a wire 9a. Before jacking up, the hydraulic jack 3a is jack-set in a low-voltage circuit to ensure that the hydraulic jack 3a is in contact with the load surface of the upper turbine casing 1, and then the rotary encoder. 6
The strog of a is set as the zero point.

The same applies to the other hydraulic jacks 3b, 3c and 3d. As a result, the error at the time of jacking up is eliminated, and the stroke of the rotary encoder 6a is set to the zero point in that state, so that the accuracy of the subsequent length measurement is high.

FIG. 3 is an enlarged view of the essential parts showing the jack-up state of FIG. Here, the rod 4a of the hydraulic jack 3a is in the cylinder 5a after being jacked up.
Has been extended from. Rotary encoder 6
In a, the body 11a is in a state in which the wire 9a is extended in synchronization with the jack-up. The same applies to the other hydraulic jacks 3b, 3c, 3d.

FIG. 4 is a diagram showing a control circuit of the hydraulic jack used in the present invention. Here, the control circuit of the hydraulic jack of the hydraulic jack 3a will be described. The solid line shows the hydraulic circuit and the dotted line shows the control circuit. Oil is sucked up from the oil tank 17 by the hydraulic pump 17, and the riff valve 1
5,16 for example from 175 kgf / cm ² upper Tabin casing 1 to a pressure i.e. 50 kgf / cm ² does not rise lifting the hydraulic circuit and a low-pressure circuit, jacked set at the low pressure circuit, and zeros the stroke of the rotary encoder 6a To do.

Other hydraulic jacks 3b (not shown), 3c
The same operation is performed for 3d (not shown). After that, the hydraulic circuits of the hydraulic jacks 3a, 3b, 3c, 3d are adjusted to high pressure circuits by adjusting the relief valves 15 and 16, and the upper turbine casing 1 is moved from the lower turbine casing 2 by interlocking them. The rotary encoder 6 measures the moving distance of the upper turbine casing 1 from the lower turbine casing 2.
a, 6b (not shown), 6c (not shown), and 6d, the signal is input to the hydraulic control device 12, the movement deviation is determined there, and the movement deviation set range (for example, set value 2 m
m), the solenoid valves 13a, 13b (not shown), 13c (not shown) and 13d respectively provided in the high pressure circuits perform “ON” and “OFF” operations to make the upper turbine casing 1 and The moving distance from the lower turbine casing 2 is adjusted.

Reference numeral 14 is a pressure gauge, 18a, 18b (not shown), 18c (not shown), 18d is a boost cylinder, 19a, 19b (not shown), 19c (not shown), 19d is a flow control valve. Is. The output of the hydraulic jack is used at an ultra-high pressure of about 600 kgf / cm ² , and the normal control hydraulic circuit is 150 to 200 kgf / cm ^2.
The boost cylinder 18 described above is required because low pressures are commonly used and reliable.

Here, as the deviation adjustment, the hydraulic control device 10 obtains the movement deviation due to the maximum value and the minimum value, and when the movement deviation exceeds the set range, the hydraulic jack having the maximum movement distance is stopped. , When the hydraulic jack with the minimum moving distance is jacked up to that moving distance, the stopped hydraulic jack is moved again to adjust.

In this case, the hydraulic jacks other than the hydraulic jacks having the maximum and minimum moving distances are within the set range, so either jack up as is, or stop when the maximum moving distance is reached, and then stop. When the hydraulic jack of the moving distance of the value is jacked up to the moving distance of the maximum value, the stopped hydraulic jack can be moved again and adjusted.

The above adjustment is carried out by solenoid valves 13a, 13b (not shown), 13c (not shown), 13d respectively provided in the high pressure circuit. The reason why the solenoid valve is limited is that the solenoid valve can be controlled “ON” and “OFF” and can be adjusted quickly.

Examples of the present invention will be specifically described in detail. Figure 5
Using a rotary encoder, a hydraulic jack device, and a control device for the hydraulic jack as shown in FIGS.
It is a figure which shows one Example of the control state at the time of jacking up a turbine casing.

FIG. 6 is an explanatory diagram of an embodiment of the adjusting operation. The following specifications were used. Hydraulic jack 20 (ton) x 70mm (stroke) x 4 units. Hydraulic unit High pressure 1 circuit, Low pressure 1 circuit. Length measuring device Rotary encoder.

Although the set movement deviation was suppressed to 2 mm and the hydraulic system was operated to perform jack-up, the hydraulic jacks 3a, 3b, 3c (not shown), 3d, the amount of rise 3A,
Of 3B, 3C and 3D, the hydraulic jack 3a is 30mm
Since the hydraulic jack 3b became 28 mm, the solenoid valve in the high-pressure circuit of the fastest hydraulic jack 3a was turned off and stopped.

The amount of lifting of the hydraulic jacks 3c and 3d is 30 m
When m, the solenoid valves of the high pressure circuits of the hydraulic jacks 3c and 3d are similarly turned "OFF" and stopped. Then, when the amount of rise of the hydraulic jack 3b reached 30 mm, the solenoid valves of the high pressure circuits of the hydraulic jacks 3a, 3c, 3d were turned "ON" to raise the whole.

In the above case, the adjustment operation shown in FIG. 7 can be performed. FIG. 7 is an explanatory diagram of another embodiment of the adjusting operation. Although the setting movement deviation was suppressed to 2 mm and jacking up was performed, among the ascending amounts 3A, 3B, 3C and 3D of the hydraulic jacks 3a, 3b, 3c and 3d, the hydraulic jack 3a was 29 mm and the hydraulic jack 3b was 27 mm. Therefore, the solenoid valve in the high-pressure circuit of the fastest hydraulic jack 3a was turned off and stopped.

Here, even if the amount of rise of the hydraulic jacks 3c and 3d is 29 mm, the hydraulic jacks 3c and 3d are not stopped because they are within the set movement deviation. However, when the amount of rise of the hydraulic jack 3c was 30 mm, the set movement deviation was 2 mm, so the hydraulic jack 3c was stopped. Then, when the amount of rise of the hydraulic jack 3b reaches 29 mm, the solenoid valve of the hydraulic jack 3a is turned “ON”, and the amount of rise of the hydraulic jack 3b is 30 mm.
When the value reached mm, the solenoid valve of the hydraulic jack 3c was turned on to raise the whole.

In any case, according to the present invention, the operation is easy, and the parallel movement can be adjusted accurately and quickly. As a result, no additional work such as inspection is required during the operation of the hydraulic jack, and the work can be performed in about 3 minutes.
In the above embodiment, the case of vertical translation when removing the upper turbine compartment was described, but when the upper turbine compartment is hung by a crane and attached to the lower turbine compartment,
Similarly, a hydraulic jack can be used for horizontal translation.

[0040]

As described above, according to the present invention, even when a heavy object such as a hydraulic jack is used for jacking up, a parallel movement can be performed easily, accurately and quickly.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of jack-up of an upper turbine casing according to the present invention.

FIG. 2 is an enlarged view of an essential part showing a state before jacking up in FIG.

FIG. 3 is an enlarged view of an essential part showing a state after jacking up in FIG.

FIG. 4 is a diagram showing an embodiment of a control circuit of the hydraulic jack used in the present invention.

FIG. 5 is a diagram showing an embodiment of a control state when the upper turbine casing of the present invention is jacked up.

FIG. 6 is an explanatory diagram of an example of a control state adjusting operation shown in FIG. 5;

FIG. 7 is an explanatory diagram of another embodiment of the control state adjustment operation shown in FIG.

[Explanation of symbols]

1 upper turbine casing, 2 lower turbine casing, 3a, 3b, 3c, 3d hydraulic jacks, 4a, 4b, 4c, 4d rods, 5a, 5b, 5c, 5d cylinders, 6a, 6b, 6c, 6d rotary encoder, 7a, 7b, 7c, 7d Attachment, 8a, 8b, 8c, 8d Attachment, 9a, 9b, 9c, 9d Wire, 10a, 10b, 10c, 10d Stator, 11a, 11b, 11c, 11d Main body, 12 Hydraulic pressure Control device, 13a, 13b, 13c, 13d Solenoid valve, 14 Pressure gauge, 15, 16 Relief valve, 17 Oil pump, 18a, 18b, 18c, 18d Boost cylinder, 19a, 19b, 19c, 19d Flow control valve, 20 Oil Tank, 21 hydraulic hose, 22 encoder cable.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyuki Fukui 2-4, Kanda Jinbocho, Chiyoda-ku, Tokyo Taihei Denki Co., Ltd.

Claims (1)

[Claims] 1. A plurality of hydraulic jacks are attached to a heavy object,
When moving a heavy object in parallel from the foundation, attach a length measuring device for measuring the moving distance between the heavy object and the foundation, corresponding to each hydraulic jack, and set the hydraulic jack in a low pressure circuit. , The stroke of the length measuring device is set to zero, and then the heavy load is moved in parallel from the foundation by the linked operation of the high pressure circuit of the hydraulic jack, and the moving distance of the heavy load from the base is measured by the length measuring device. When the deviation of movement due to the maximum value and the minimum value exceeds the set range, the movement distance between the heavy object and the foundation is adjusted by the solenoid valve provided in each of the high-voltage circuits, and the parallel movement adjustment by the hydraulic jack. Method.