JPH0469247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a watertight rubber crimping device for a gate installed in a water conduit or the like in a dam.

Prior art and its problems FIG. 4 shows a main gate 3 provided in a water conduit 2 of a dam 1. This gate 3 is a radial gate, and is opened and closed by a hydraulic cylinder 4. An annular watertight rubber 5 is attached to the inner peripheral surface of the water conduit 2 and is press-fitted to the entire front surface of the gate 3 in the closed state.

As such a watertight rubber crimping device for the gate 3, the water pressure of the dam 1 is introduced to pressurize the antifreeze liquid filled in the watertight rubber 5, and this antifreeze liquid is further pressurized by a pump to increase the pressure from the water pressure of the dam 1. A device that generates a large pressure bonding force is known. However, in the case of this device, the pump simply sends a certain amount of clean water into the watertight rubber and pressurizes the antifreeze liquid extra, so it is difficult to maintain the pressurizing force of the watertight rubber, that is, the pressing force at the desired value. Not exclusively.

An object of the present invention is to provide a watertight rubber crimping device that solves the above problems and can maintain the crimping force of watertight rubber at a desired value.

Means for Solving the Problems The watertight rubber crimping device according to the present invention includes an antifreeze solution for pressurizing the watertight rubber that is sent into the watertight rubber that is crimped to the closed gate, and an antifreeze solution that pressurizes the antifreeze liquid to pressurize the watertight rubber to pressurize the watertight rubber. An airtight pressure tank containing air to pressurize the antifreeze liquid sent to the tank, an air retainer, an air supply means for supplying air from the air retainer into the airtight pressure tank to pressurize the antifreeze liquid, and discharging air from the airtight pressure tank. an air discharge means for adjusting the amount of air supplied into the airtight pressure tank by the air supply means; an air supply valve with an adjustable opening for adjusting the amount of air supplied into the airtight pressure tank by the air supply means; a pressure sensor that detects the water pressure in the dam and converts it into an electrical signal;
A pressure detector detects the pressure applied to the watertight rubber by antifreeze and converts it into an electrical signal, and the pressure applied to the watertight rubber is determined based on the detection result of the water pressure of the dam based on the predetermined relationship between the water pressure of the dam and the pressure applied to the watertight rubber. In addition to calculating the target value, the difference between this target value and the detection result of the pressure force of the watertight rubber is calculated, and when this difference is out of a predetermined range, the pressure force of the watertight rubber becomes equal to the target value. The airtight pressure tank is equipped with arithmetic control means for adjusting the opening degrees of the air supply valve and air discharge valve of the airtight pressure tank.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows the same watertight rubber 11 installed in the water pipe of the dam 10 and the dam water intake port 1 of the dam 10.
A watertight rubber crimping device is shown which is provided between Oa and watertight rubber 11, and this device is composed of a pressure unit 12 that pressurizes the watertight rubber and presses it to the main gate in the closed state, and an operation panel 13 that controls this. Also, the second
The figure shows details of the pressure unit 12 of the watertight rubber crimping device.

The pressure unit 12 of the watertight rubber crimping device is provided with an antifreeze mixing tank 14, an airtight pressure tank 15, a compressor 16 with an air reservoir, and three pressure detectors 17, 18, 19 with indicators.

The bottom of the airtight pressure tank 15 is connected to an antifreeze supply pipe 20.
This pipe 2 is connected to watertight rubber 11 by
0, the electric switching valve 21 is installed in order from the pressure tank 15 side.
and a flow rate regulating valve 22 are provided. The pressure tank 15 contains antifreeze A for pressurizing the watertight rubber and air B for pressurizing the antifreeze. It is attached to 15.
Further, the pressure tank 15 is provided with a liquid level gauge 23 and a level switch 24 for detecting an abnormally high water level, a full water level, a reduced water level, and an abnormally low water level.

The upper part of the airtight pressure tank 15 is connected to the air reservoir of the compressor 16 by an air supply pipe 25, and this pipe 25 includes, in order from the compressor 16 side, a check valve 26 and an air supply valve whose opening degree can be adjusted. A first electric control valve 27 is provided. Also,
One end of an air discharge pipe 28 is connected to the upper part of the pressure tank 15, and the other end of this pipe 28 faces a drain tank 29. And air exhaust pipe 2
8 is provided with a second electric control valve 30 for air discharge whose opening degree can be adjusted and a variable flow rate control valve 31 in order from the tank 15 side. Furthermore, a safety valve 32 is attached to the upper part of the pressure tank 15.

The bottom of the antifreeze mixing tank 14 is connected to the antifreeze transfer pipe 3.
3, the airtight pressure tank 15 of the antifreeze supply pipe 20
This pipe 33 includes, in order from the antifreeze mixing tank 14 side, a suction side strainer 34, an antifreeze transfer pump 35, a discharge side strainer 36, a check valve 37, a flow rate adjustment valve 38, and a check check valve. A valve 39 is provided. Antifreeze mixing tank 14
The upper part of the is connected to the antifreeze supply pipe 2 by the antifreeze discharge pipe 40.
0 on the watertight rubber 11 side, and this pipe 40 includes, in order from the watertight rubber 11 side, a second pressure detector 18 that detects the pressure of the antifreeze and converts it into an electrical signal, and an electric switching valve. 41 and flow rate adjustment valve 4
2 is provided. Further, an antifreeze relief pipe 43 is provided between the part of the antifreeze supply pipe 20 on the watertight rubber 11 side and the antifreeze mixing tank 14.
3 is provided with a relief valve 44. The antifreeze mixing tank 14 is provided with a liquid level gauge 45 and a level switch 46 for detecting a full water level and a low water level. In addition, at the top of the antifreeze mixing tank 14,
An air vent/antifreeze inlet 47 is provided.

At the other end of the dam water introduction pipe 49, one end of which is open to the dam water intake port 10a of the dam 10, is a third pressure detector 1 that detects the water pressure of the dam 10 and converts it into an electrical signal.
9 is provided. In addition, the dam water supply pipe 5 is equipped with a dam water supply valve 50 which is always closed at the top of the dam water introduction pipe 49 and the antifreeze mixing tank 14.
1.

The operation panel 13 of the watertight rubber crimping device includes an automatic controller that adjusts the opening degrees of two electric regulating valves 27 and 30 based on the output signals of three pressure detectors 17, 18, and 19, as described later. 52 and each pressure detector 1
3 to indicate the detection results of 7, 18, and 19 respectively
Pressure indicators 53, 54, and 55 are provided. The controller 52 is equipped with a computer, and positioners 56 and 57 are provided between the controller 52 and the first electric regulating valve 27 and between the controller 52 and the second electric regulating valve 30, respectively. . Further, the operation panel 13 is provided with a control circuit 58 that controls the electric switching valves 21, 41, the antifreeze transfer pump 35, etc. based on gate opening/closing operation signals, output signals of the level switches 24, 46, and the like.

The watertight rubber crimping device described above operates automatically in conjunction with the opening/closing operation of the gate as follows.

While the gate is moving, the switching valve 21 of the antifreeze supply pipe 20 is closed, and the switching valve 4 of the antifreeze discharge pipe 40 is closed.
1 is open. In addition, two electric control valves 27,
30 is closed, the compressor 16 is stopped, and an appropriate amount of antifreeze A and air B at a predetermined pressure are sealed in the airtight pressure tank 15.

When the gate closes and stops, the switching valve 41 of the antifreeze discharge pipe 40 closes due to the gate stop signal.
The switching valve 21 of the antifreeze supply pipe 20 opens and the compressor 16 starts. As a result, the antifreeze A in the airtight pressure tank 15 is sent to the watertight rubber 11 through the antifreeze supply pipe 20 by the pressure of the air B, and as a result, the watertight rubber 11 is pressurized and expands, and a predetermined pressure is applied to the gate. Crimp. In this state, the automatic controller 52 controls the pressing force, that is, the pressing force of the watertight rubber 11, as follows.

That is, first, the controller 52 calculates a target value of the pressurizing force of the watertight rubber 11 based on the detection result of the water pressure of the dam 10 by the third pressure detector 19. Controller 5
2 stores the relationship between the water pressure of the dam 10 and the pressing force of the watertight rubber 11 as shown in FIG. 3, and the target value is calculated based on this relationship. The relationship shown in Figure 3a is one in which the difference between the pressing force of the watertight rubber 11 and the water pressure of the dam is constant, and the relationship shown in Figure 3b is that the difference is large in low pressure reduction and small in the high pressure region, and the difference in pressing force of the watertight rubber 11 is constant. Something that changes in a straight line,
The relationship shown in figure c shows that the difference is small in low pressure reductions and large in high pressure regions, and the pressure applied to the watertight rubber 11 changes in a curved manner, and one of these differences is set in the controller 52. Note that since this calculation is performed by a computer, these relationships can be changed in any way. Once the target value of the pressing force of the watertight rubber 11 has been calculated in this way, the difference (pressure difference) between this value and the detection result of the pressing force of the watertight rubber 11 by the first pressure detector 17 is calculated. A fixed dead zone is set in the controller 52, and the pressure difference is compared with this dead zone.
When the pressure difference is within the dead band, the two electric control valves 27 and 30 are held fully open, and when the pressure difference is outside the dead band, the pressure is adjusted as follows. The electric control valves 27 and 30 are controlled so that the difference is within the range. That is,
If the detection result of the pressure applied to the watertight rubber 11 is smaller than the target value, the controller 52 calculates the opening degree of the first electric control valve 27 according to these pressure differences (for example, proportional to the pressure difference). , this is commanded to the first positioner 56, and the first positioner 56 opens the first valve 27 to the opening degree commanded by the controller 52.
As a result, air B is supplied from the air reservoir of the compressor 16 through the air supply pipe 25 into the pressure tank 15, and the pressure of the air B, that is, the pressurizing force of the watertight rubber 11 by the antifreeze A gradually increases. When the pressurizing force of the watertight rubber 11 increases and the pressure difference from the target value decreases, the opening degree of the first valve 27 is adjusted to decrease accordingly. And watertight rubber 11
When the pressurizing force reaches the target value and the pressure difference becomes zero, the first valve 27 is completely closed and the watertight rubber 1 is closed.
1 is maintained at the target value. On the contrary,
If the detection result of the pressurizing force of the watertight rubber 11 is larger than the target value, the controller 52 calculates the opening degree of the second electric control valve 30 according to these pressure differences (for example, proportional to the pressure difference). , this is commanded to the second positioner 57, and the second positioner 57 opens the second valve 30 to the opening commanded by the controller 52.
As a result, the air B in the pressure tank 15 is discharged through the air discharge pipe 28, and the pressure of the air B, that is, the pressing force of the watertight rubber 11 by the antifreeze A gradually decreases. When the pressurizing force of the watertight rubber 11 decreases and the pressure difference from the target value decreases, the opening degree of the second valve 30 is adjusted to decrease accordingly. When the pressurizing force of the watertight rubber 11 reaches the target value and the pressure difference becomes zero, the second valve 30 is completely closed to maintain the pressurizing force of the watertight rubber 11 at the target value.

In this way, the controller 52 is connected to the pressure detectors 17, 1
By adjusting the opening degrees of the electric control valves 27 and 28 based on the detection result of 9, the pressurizing force of the watertight rubber 11 is always maintained at a desired value even if the water pressure of the dam 10 changes. The compressor 16 is equipped with an air reservoir, and the pressurizing force of the watertight rubber 11 is controlled by adjusting the opening degrees of the electric control valves 27 and 28. Therefore, while the gate is closed, the pressure inside the air reservoir is It is only necessary to operate the compressor 16 to maintain the air pressure within a predetermined range, and this can be used in cases such as when the water pressure in the dam 10 fluctuates rapidly or when pressurization and depressurization of the watertight rubber 11 are frequently repeated. Also, there is no need to repeatedly start and stop the compressor 16. Furthermore, since the opening degrees of the electric control valves 27 and 30 are adjusted by providing a dead zone as described above, even if the water pressure in the dam 10 repeatedly fluctuates within a relatively narrow range, pressurization and depressurization can be performed frequently. There's no need to repeat it.

The controller 52 also compares the detection results of the first pressure detector 17 and the second pressure detector 18, and issues an alarm when the absolute value of the difference between them is large. Thereby, abnormalities such as damage to the watertight rubber 11 can be easily detected. In addition, the second
The pressure detector 18 may detect the pressure of the antifreeze directly from the watertight rubber 11. In this way, the detection accuracy can be improved by eliminating errors caused by the elasticity of the watertight rubber. Further, the pressurizing force of the watertight rubber 11 is detected by the second pressure detector 18 or a pressure detector directly attached to the watertight rubber 11, and based on the detection result, the electric control valves 27, 30 are
may be controlled.

Note that the opening degree of the electric control valves 27 and 30 is adjusted as follows.
This can also be done by manually operating the positioners 56 and 57.

When the gate opens, first, the switching valve 21 of the antifreeze supply pipe 20 is closed, the switching valve 41 of the antifreeze discharge pipe 40 is opened, and the watertight rubber 1
The antifreeze in the tank 1 is discharged into the antifreeze mixing tank 14 through the antifreeze discharge pipe 40 by the water pressure of the dam 10 and the elastic contraction of the watertight rubber 11. Then, after the watertight rubber 11 contracts and separates from the gate in this way, the gate opens. Note that the aforementioned gate closing operation is also performed with the watertight rubber 11 contracted in this manner.

When the watertight rubber 11 is repeatedly expanded and contracted under pressure as the gate is opened and closed as described above, the antifreeze A in the airtight tank 15 decreases, so it is replenished from the antifreeze mixing tank 14 as follows. That is, when the antifreeze in the pressure tank 15 decreases to the reduced water level, the pump 35 is started and the antifreeze mixing tank 1 is activated.
Antifreeze A is sent from 4 to the pressure tank 15, and the pump 35 stops when the antifreeze A in the pressure tank 15 reaches its full level. While the antifreeze in the pressure tank 15 is between the full water level and the reduced water level, the pump 35
has stopped, and in this way the pressure tank 15
A suitable amount of antifreeze A is retained within the tank. Further, when the antifreeze A in the antifreeze mixing tank 14 decreases and reaches the reduced water level, the dam water replenishment valve 50 opens and dam water is replenished into the tank 14 from the dam water intake port 10a, and the antifreeze A reaches the full water level. The valve 50 closes when the antifreeze A reaches the full level and the low water level, and in this way, the antifreeze A in the antifreeze mixing tank 14 is also maintained at an appropriate level. Ru.

In the above watertight rubber crimping device, the automatic controller 52
The following safety measures have been taken so that even if the watertight rubber 11 should be pressurized and crimped to the gate, even if the watertight rubber 11 breaks down.

First, the dam water introduction pipe 49 and the antifreeze transfer pipe 33 are connected to a first auxiliary pipe 6 equipped with a valve 59 that is normally closed.
A second auxiliary pipe 62 that is connected to the antifreeze supply pipe 20 by a normally closed valve 61 is connected in parallel to the electric switching valve 21 and the flow rate adjustment valve 22 . Therefore, it is also possible to directly introduce dam water into the watertight rubber 11 and pressurize it.
The watertight rubber 11 can also be pressurized by the pump 35. Further, an auxiliary connecting pipe 64 equipped with a normally closed valve 63 is connected to the second auxiliary pipe 62, and when a plurality of gates are provided,
The watertight rubber 11 can also be pressurized by connecting the auxiliary connecting pipe 64 to a watertight rubber crimping device of another gate.

Effects of the Invention Since the watertight rubber crimping device according to the present invention has the above-described configuration, the crimping force of the watertight rubber can always be maintained at a desired value. Since the target value of the watertight rubber's crimp force is calculated, it is possible to arbitrarily set the relationship between the water pressure of the dam and the watertight rubber's crimp force to obtain the optimal watertight rubber's crimp force. . In addition, air supply means such as compressors are equipped with an air reservoir, and the pressurizing force of the watertight rubber is controlled by adjusting the opening degree of the electric control valve. Even when the rubber is pressurized and depressurized frequently, there is no need to repeatedly start and stop the air supply means. Furthermore, since the opening of the electric control valve is adjusted only when the difference between the target value and the detection result of the pressure force of the watertight rubber is out of a predetermined range, the water pressure in the dam repeatedly fluctuates within a relatively narrow range. However, there is no need to frequently pressurize and depressurize the watertight rubber.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing the pipe system and electrical system of a watertight rubber crimping device showing an embodiment of the present invention;
The figure is a pipe system diagram showing the pressurizing unit of the watertight rubber crimping device in Figure 1, Figure 3 is three types of graphs showing the relationship between the water pressure of the dam and the pressurizing force of the watertight rubber, and Figure 4 is the water conduit pipe of the dam. FIG. 3 is a vertical cross-sectional view showing the main gate. 10...Dam, 11...Watertight rubber, 15...Airtight pressure tank, 16...Compressor, 17,1
9...Pressure detector, 25...Air supply pipe, 27,
30...Electric control valve, 28...Air discharge pipe, 52
...Automatic controller, 56, 57...Positioner.

Claims (1)

[Scope of Claims] 1. Antifreeze fluid for pressurizing the watertight rubber that is sent into the watertight rubber that is crimped onto the gate in the closed state, and air for pressurizing the antifreeze fluid that pressurizes the antifreeze fluid and sends it into the watertight rubber. an airtight pressure tank having an airtight pressure tank, an air supply means for supplying air from the airtight pressure tank into the airtight pressure tank to pressurize the antifreeze solution, an air discharge means for discharging air from the airtight pressure tank, an air supply means for discharging air from the airtight pressure tank; An air supply valve with an adjustable opening to adjust the amount of air supplied into the airtight pressure tank; An air exhaust valve with an adjustable opening to adjust the amount of air discharged from the airtight pressure tank by the air exhaust means , a pressure detector that detects the water pressure in the dam and converts it into an electrical signal, a pressure detector that detects the pressure applied to the watertight rubber by antifreeze and converts it into an electrical signal, and a predetermined dam water pressure and pressure applied to the watertight rubber. The target value of the pressure force of the watertight rubber is calculated from the detection result of the water pressure of the dam based on the relationship, and the difference between this target value and the detection result of the pressure force of the watertight rubber is calculated, and this difference is determined in advance. A gate in a dam that is equipped with a calculation control means that adjusts the opening degree of the air supply valve and air discharge valve of the airtight pressure tank so that the pressurizing force of the watertight rubber becomes equal to the target value when the pressure is out of range. Watertight rubber crimping device.