CN213655769U - Gate valve hydraulic system for hydropower station - Google Patents
Gate valve hydraulic system for hydropower station Download PDFInfo
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- CN213655769U CN213655769U CN202022743249.5U CN202022743249U CN213655769U CN 213655769 U CN213655769 U CN 213655769U CN 202022743249 U CN202022743249 U CN 202022743249U CN 213655769 U CN213655769 U CN 213655769U
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Abstract
The utility model discloses a gate valve hydraulic system for power station can realize the action rhythm of opening soon-opening slowly-opening soon-closing slowly, makes the gate valve open and close the process speed and accelerate, opens and closes the reaction rapider, and the effect is better. Through setting up the third overflow valve, make the gate valve when descending process and decline target in place, pneumatic cylinder rodless chamber pressure is restricted, is less than lifting pressure, and concrete setting value can be adjusted according to the closing pressure that the gate valve designed to can not destroy the gate valve and seal, still do not influence the sealed effect of gate valve. Through setting up the second overflow valve to make the oil return have the backpressure of certain pressure, specific backpressure value can adjust and set for according to actual conditions. Thereby the action of gravity of balanced flashboard to a certain extent for the flashboard is more steady at the decline in-process, reduces and strikes.
Description
Technical Field
The utility model belongs to the technical field of gate valve hydraulic control, a gate valve hydraulic system for power station is related to.
Background
The valve is an indispensable important part for ensuring smooth work of the hydropower station and controls the work of each pipeline of the hydropower station. The corresponding valves are adopted according to different functions of the pipeline, so that the function of the pipeline is exerted to the maximum.
Among the existing solutions, butterfly valves and gate valves are most commonly used for pipeline fluid control. Butterfly valves are commonly used for flow control in pipelines, but gate valves are more widely used for blocking fluids. For controlling the gate valve, the existing hydraulic control system has the following two disadvantages:
(1) the opening and closing speed of the gate is constant, and the action rhythm of quick opening, slow opening, quick closing and slow closing is not achieved, so that the opening and closing speed of the gate valve is slow, and the opening and closing effect is influenced;
(2) the existing gate valve control hydraulic system has the same lifting and closing pressure, and is the system pressure. However, the actual lifting pressure and the actual dropping pressure of the gate are the same, so that the dropping pressure of the gate is too high, and the sealing is damaged;
(3) because the flashboard of gate valve is vertical installation, gravity and decurrent thrust direction coincidence when descending cause start-up unstability or circumstances such as decline stall.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a gate valve hydraulic system for power station can realize the action rhythm of opening soon-opening slowly-opening soon-closing slowly, makes the gate valve open and close the process speed and accelerate, opens to close the reaction more rapidly, and the effect is better.
The utility model discloses a gate valve hydraulic system for power station, include: the hydraulic control system comprises an oil tank, an oil absorption filter, a motor, a hydraulic pump, a check valve, an electromagnetic directional valve, a superposed hydraulic control check valve, a superposed one-way throttle valve, a first electromagnetic valve, a second electromagnetic valve, a first throttle valve, a second throttle valve, a first stop valve, a second stop valve, a first overflow valve, a second overflow valve, a third overflow valve, a gate valve, a hydraulic cylinder, a first photoelectric switch, a second photoelectric switch, a third photoelectric switch and a control box;
the hydraulic pump is connected with the motor through a coupler, the oil absorption filter is arranged in the oil tank and is connected with an oil inlet of the hydraulic pump, an oil outlet of the hydraulic pump is connected with an oil inlet of the electromagnetic directional valve through a one-way valve, a first oil outlet of the electromagnetic directional valve is sequentially connected with the superposition type hydraulic control one-way valve, the superposition type one-way throttle valve, the first electromagnetic valve and the first throttle valve connected with the first electromagnetic valve in parallel, and then is connected with the rod cavity of the hydraulic cylinder after being connected with the first stop valve through a rubber tube, and a second oil outlet of the electromagnetic directional valve is sequentially connected with the superposition type hydraulic control one-way valve, the superposition type one-way throttle valve, the second electromagnetic valve and the second throttle valve connected with the second electromagnetic valve in parallel, and then; a piston rod of the hydraulic cylinder is connected with the gate valve rod through a connecting block; the first photoelectric switch, the second photoelectric switch and the third photoelectric switch are fixed between the gate valve and the hydraulic cylinder so as to detect the position of the connecting block; when the connecting block is positioned at the position of the first photoelectric switch, the gate valve is completely closed; when the connecting block is positioned at the position of the second photoelectric switch, the gate valve is completely opened; when the connecting block is positioned at the position of the third photoelectric switch, the gate valve is partially opened; an oil outlet of the hydraulic pump is connected with an oil tank through a first overflow valve, an oil return port of the electromagnetic directional valve is connected with the oil tank through a second overflow valve, and an oil outlet of the second electromagnetic valve is connected with the oil tank through a third overflow valve; the control box is respectively connected with the first photoelectric switch, the second photoelectric switch, the third photoelectric switch, the first electromagnetic valve, the second electromagnetic valve, the electromagnetic directional valve and the motor through cables.
In the gate valve hydraulic system for the hydropower station of the utility model, the gate valve hydraulic system for the hydropower station is further provided with a manual pump and a pressure gauge, the oil inlet of the manual pump is connected with the oil tank through a pipeline, and the oil outlet of the manual pump is connected with the oil inlet of the electromagnetic directional valve; and a first pressure measuring head is arranged on an oil outlet of the manual pump and an oil inlet of the electromagnetic directional valve, and the first pressure measuring head is connected with a pressure gauge through a pressure measuring hose.
The utility model discloses an among the gate valve hydraulic system for power station, be equipped with the sleeve between gate valve and the pneumatic cylinder, the sleeve both ends are connected with pneumatic cylinder and gate valve through the flange respectively, and the sleeve cover is established at piston rod, connecting block and flashboard valve rod outside, be equipped with the notch on the sleeve and supply first photoelectric switch, second photoelectric switch and third photoelectric switch to stretch into.
The utility model discloses an among the gate valve hydraulic system for power station, be equipped with second pressure measurement joint between the oil return opening of electromagnetic directional valve and the second overflow valve.
In the gate valve hydraulic system for a hydropower station of the utility model, a third pressure measuring joint is arranged between the first electromagnetic valve and the first stop valve; and a fourth pressure measuring joint is arranged between the second electromagnetic valve and the second stop valve.
The utility model discloses an among the gate valve hydraulic system for power station, be equipped with level gauge and air cleaner on the oil tank.
The utility model discloses a gate valve hydraulic system for power station can realize the action rhythm of opening soon-opening slowly-opening soon-closing slowly, makes the gate valve open and close the process speed and accelerate, opens and closes the reaction rapider, and the effect is better. Through setting up the third overflow valve, make the gate valve when descending process and decline target in place, pneumatic cylinder rodless chamber pressure is restricted by the third overflow valve, is less than lifting pressure, and the specific setting value of third overflow valve can be adjusted according to the closing pressure that the gate valve designed to can not destroy the gate valve and seal, still do not influence the sealed effect of gate valve. Through setting up the second overflow valve to make the oil return have the backpressure of certain pressure, specific backpressure value can adjust and set for according to actual conditions. Thereby the action of gravity of balanced flashboard to a certain extent for the flashboard is more steady at the decline in-process, reduces and strikes.
Drawings
Fig. 1 is the utility model discloses a gate valve hydraulic system's for power station schematic diagram.
Detailed Description
As shown in fig. 1, the utility model discloses a gate valve hydraulic system for power station, include: the hydraulic control system comprises an oil tank 7, an oil absorption filter 4, a hydraulic pump 8, a check valve 12, an electromagnetic directional valve 15, a superposed hydraulic control check valve 16, a superposed one-way throttle valve 17, a first electromagnetic valve 181, a second electromagnetic valve 182, a first throttle valve 191, a second throttle valve 192, a first stop valve 141, a second stop valve 142, a first overflow valve 131, a second overflow valve 132, a third overflow valve 133, a gate valve 20, a hydraulic cylinder 30, a first photoelectric switch Q1, a second photoelectric switch Q2, a third photoelectric switch Q3 and a control box.
The hydraulic pump 8 is connected with the motor 5 through the coupler 6, the oil absorption filter 4 is arranged in the oil tank 7 and is connected with an oil inlet of the hydraulic pump 8, an oil outlet of the hydraulic pump 8 is connected with an oil inlet of the electromagnetic directional valve 15 through the check valve 12, and a first oil outlet A of the electromagnetic directional valve 15 is sequentially connected with a first group of hydraulic control check valves of the superposition type hydraulic control check valve 16, a first group of one-way throttle valves of the superposition type one-way throttle valve 17, the first electromagnetic valve 181 and a first throttle valve 191 connected with the first electromagnetic valve 181 in parallel, and then is connected with a rod cavity of the hydraulic cylinder 30 after being connected with the first stop valve 141 through a. The second oil outlet B of the electromagnetic directional valve 15 is connected to the second group of pilot-controlled check valves of the stacked pilot-controlled check valve 16, the second group of check throttle valves of the stacked check throttle valve 17, the second electromagnetic valve 182, and the second throttle valve 192 connected in parallel to the second electromagnetic valve 182 in sequence, and then connected to the second stop valve 142 through a rubber tube and then connected to the rodless cavity of the oil cylinder 30. A piston rod 31 of the hydraulic cylinder 30 is connected with the gate valve rod 21 through a connecting block 22, and the gate valve rod 21 is driven to move up and down through the up-and-down movement of the piston rod 31, so that the up-and-down movement of the gate is realized. The first photoelectric switch Q1, the second photoelectric switch Q2 and the third photoelectric switch Q3 are fixed between the gate valve 20 and the hydraulic cylinder 30 so as to detect the position of the connecting block, and the judgment of the position of the gate plate is realized by detecting the position of the connecting block 22 through the first photoelectric switch Q1, the second photoelectric switch Q2 and the third photoelectric switch Q3. When the connecting block 22 is located at the position of the first photoelectric switch Q1, the gate valve is completely closed; when the connecting block 22 is located at the position of the second photoelectric switch Q2, the gate valve is completely opened; when the connection block 22 is in the position of the third photoelectric switch Q3, the gate valve is partially opened, and the third photoelectric switch Q3 is in the fast-slow switching position, which is usually a position where the gate valve is fully closed by 20%. The position of the third photoelectric switch Q3 can be adjusted according to actual conditions.
The hydraulic pump 8 is connected with the oil tank 7 through a first overflow valve 131, an oil outlet of the hydraulic pump 8 is connected with an oil inlet of the first overflow valve 131, and an oil outlet of the first overflow valve 131 is connected with the oil tank 7. The electromagnetic directional valve 15 is connected with the oil tank 7 through a second overflow valve 132, an oil return port of the electromagnetic directional valve 15 is connected with an oil inlet of the second overflow valve 132, and an oil outlet of the second overflow valve 132 is connected with the oil tank 7. The second electromagnetic valve 182 is connected with the oil tank 7 through a third overflow valve 133, an oil outlet of the second electromagnetic valve 182 is connected with an oil inlet of the third overflow valve 133, and an oil outlet of the third overflow valve 133 is connected with the oil tank 7. The control box is respectively connected with the first photoelectric switch Q1, the second photoelectric switch Q2, the third photoelectric switch Q3, the first electromagnetic valve 181, the second electromagnetic valve 182, the electromagnetic directional valve 15 and the motor 5 through cables.
In specific implementation, the gate valve hydraulic system for the hydropower station is further provided with a manual pump 3 and a pressure gauge 11, an oil inlet of the manual pump 3 is connected with an oil tank 7 through a pipeline, and an oil outlet of the manual pump 3 is connected with an oil inlet of an electromagnetic directional valve 15; and a first pressure measuring joint 91 is arranged at an oil outlet of the manual pump 3 and an oil inlet of the electromagnetic directional valve 15, and the first pressure measuring joint 91 is connected with a pressure gauge 11 through a pressure measuring hose 10. The first pressure tap 91 may be used to observe the system pressure.
During specific implementation, be equipped with sleeve 40 between gate valve 20 and the pneumatic cylinder 30, the sleeve 40 both ends are connected with pneumatic cylinder 30 and gate valve 20 through the flange respectively, and the sleeve 40 cover is established at piston rod 31, connecting block 22 and flashboard valve rod 21 outside, be equipped with the notch on the sleeve 40 and supply first photoelectric switch Q1, second photoelectric switch Q2 and third photoelectric switch Q3 to stretch into.
In specific implementation, a second pressure measuring joint 92 is arranged between the oil return port of the electromagnetic directional valve 15 and the second overflow valve 132. A second pressure tap 92 may be used to observe the return back pressure.
In specific implementation, a third pressure measuring joint 94 is arranged between the first electromagnetic valve 181 and the first stop valve 141, and the third pressure measuring joint 94 can be used for observing the pressure of the rod cavity.
A fourth pressure tap 93 is provided between the second solenoid valve 182 and the second shut-off valve 142 where the pressure tap can be used to observe the rodless chamber pressure.
In specific implementation, the oil tank 7 is provided with a liquid level meter 1 and an air filter 2. The hydraulic pump 8 is connected with the motor 5 through a coupler 6.
The operation of the gate valve is explained below with reference to fig. 1:
the working process of valve opening: when a valve opening button of the control box is pressed, the motor 5 and the second coil YV2 of the electromagnetic directional valve 15 are simultaneously electrified to enter a parallel loop, the check valve 12 is communicated with the first oil outlet A of the electromagnetic directional valve 15, and the second oil outlet B of the electromagnetic directional valve 15 is communicated with the oil inlet of the second overflow valve 132. Hydraulic oil is sucked from an oil tank 7 through an oil suction filter 4 by a hydraulic pump 8 and pumped out by the hydraulic pump 8, the hydraulic oil enters a rod cavity of the hydraulic cylinder 30 through a check valve 12, a first oil outlet A of an electromagnetic directional valve 15, a first group of hydraulic control check valves of a superposition type hydraulic control check valve 16, a first group of one-way throttle valves of a superposition type one-way throttle valve 17, a first throttle valve 191 and a first stop valve 141, the hydraulic oil in the rod-free cavity of the hydraulic cylinder 30 returns to the oil tank 7 through a second stop valve 142, a second electromagnetic valve 182, a second group of one-way throttle valves of the superposition type one-way throttle valve 17, a second group of hydraulic control check valves of the superposition type hydraulic control check valve 16, a second oil outlet of the electromagnetic directional valve 15 and a second overflow valve 132, a piston rod 31 of the hydraulic cylinder slowly rises, a gate valve is slowly opened. When the connecting block 22 reaches the third photoelectric switch Q3, the control box controls the second coil YV2 of the electromagnetic directional valve 15 and the coil YV4 of the first electromagnetic valve to be electrified simultaneously, hydraulic oil is sucked by the hydraulic pump 8 from the oil tank 7 through the oil suction filter 4, and is pumped out by the hydraulic pump 8, the hydraulic oil enters the rod cavity of the hydraulic cylinder 30 through the check valve 12, the electromagnetic directional valve 15, the superposed hydraulic control check valve 16, the superposed one-way throttle valve 17, the first electromagnetic valve 181 and the first stop valve 141, the hydraulic oil in the rodless cavity of the hydraulic cylinder 30 returns to the oil tank 7 through the second stop valve 142, the second electromagnetic valve 182, the superposed one-way throttle valve 17, the superposed hydraulic control check valve 16, the electromagnetic directional valve 15 and the second overflow valve 132, the piston rod 31 of the hydraulic cylinder rises rapidly, the gate valve 20 is opened rapidly, and the rapid opening speed can be adjusted and set through the superposed one-way throttle valve 17. When the connecting block 22 reaches the second photoelectric switch Q2, the second coil YV2 of the electromagnetic directional valve 15 and the coil YV4 of the first electromagnetic valve are de-energized, the motor 5 stops running, and the gate valve is opened to the right position and stopped.
And (3) closing the valve: when a valve closing button of the control box is pressed, the motor 5, a first coil YV1 of the electromagnetic directional valve 15 and a coil YV3 of the second electromagnetic valve 182 are simultaneously electrified, the electromagnetic directional valve 15 enters a cross loop, the check valve 12 is communicated with a second oil outlet B of the electromagnetic directional valve 15, and a first oil outlet A of the electromagnetic directional valve 15 is communicated with an oil inlet of the second overflow valve 132. Hydraulic oil is sucked from an oil tank 7 by a hydraulic pump 8 through an oil suction filter 4 and pumped out by the hydraulic pump 8, the hydraulic oil enters a rodless cavity of the hydraulic cylinder 30 through a check valve 12, a second oil outlet B of the electromagnetic directional valve 15, a second group of hydraulic control check valves of the superposition type hydraulic control check valve 16, a second group of one-way throttle valves of the superposition type one-way throttle valve 17, a second electromagnetic valve 182 and a second stop valve 142, the hydraulic oil in the rod cavity of the hydraulic cylinder 30 passes through a first stop valve 141, the first electromagnetic valve 181, the first group of one-way throttle valves of the stacked one-way throttle valve 17, the first group of pilot-controlled one-way valves of the stacked pilot-controlled one-way valve 16, the first oil outlet a of the electromagnetic directional valve 15 and the second overflow valve 132 return to the oil tank 7, the hydraulic cylinder piston rod 31 descends rapidly, the gate valve 20 closes rapidly, and the rapid closing speed can be adjusted and set through the stacked one-way throttle valve 17. When the connecting block 22 reaches the third photoelectric switch Q3, the control box controls the first coil YV1 of the electromagnetic directional valve 15 to be electrified, the coil YV3 of the second electromagnetic valve is deenergized, hydraulic oil is sucked from the oil tank by the hydraulic pump 8 through the oil suction filter 4 and pumped out by the hydraulic pump 8, the hydraulic oil enters the rodless cavity of the hydraulic cylinder 30 through the check valve 12, the electromagnetic directional valve 15, the superimposed pilot-controlled check valve 16, the superimposed pilot-controlled throttle valve 17, the second throttle valve 192 and the second stop valve 142, the hydraulic oil in the rod cavity of the hydraulic cylinder 30 returns to the oil tank 7 through the first stop valve 141, the first electromagnetic valve 181, the superimposed pilot-controlled throttle valve 17, the superimposed pilot-controlled check valve 16, the electromagnetic directional valve 15 and the second overflow valve 132, the piston rod 31 of the hydraulic cylinder slowly descends, the gate valve is slowly, and the slow closing speed can be adjusted and set through the second. When the connecting block 22 reaches the first photoelectric switch Q1, the first coil YV1 of the electromagnetic directional valve 15 loses power, the motor 5 stops running, and the gate valve is closed to a certain position and stops.
Through the working process, the action rhythm of quick opening, slow opening, quick closing and slow closing of the gate valve is realized, the speed of the opening and closing process of the gate valve is accelerated, the opening and closing reaction is quicker, and the effect is better.
Through setting up third overflow valve 133, make the gate valve when descending process with descend to the right place, hydro-cylinder rodless chamber pressure is restricted by third overflow valve 133, is less than lifting pressure, and the specific setting value of third overflow valve 133 can be adjusted according to the closing pressure that the gate valve designed to can not destroy the gate valve and seal, still do not influence the sealed effect of gate valve.
By arranging the second overflow valve 132, the return oil is provided with a certain pressure back pressure, and the specific back pressure value can be adjusted and set according to actual conditions. Thereby the action of gravity of balanced flashboard to a certain extent for the flashboard is more steady at the decline in-process, reduces and strikes.
This hydraulic system has still set up manual pump 3 to all hydrovalves and solenoid valve all possess manual function, have consequently still realized this hydraulic system under the circumstances of outage, and the emergency boost is carried out to accessible manual pump, and the manual emergent action of other hydrovalves prevents the accident emergence under the outage circumstances.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the spirit of the present invention, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A gate valve hydraulic system for a hydropower station, comprising: the hydraulic control system comprises an oil tank, an oil absorption filter, a motor, a hydraulic pump, a check valve, an electromagnetic directional valve, a superposed hydraulic control check valve, a superposed one-way throttle valve, a first electromagnetic valve, a second electromagnetic valve, a first throttle valve, a second throttle valve, a first stop valve, a second stop valve, a first overflow valve, a second overflow valve, a third overflow valve, a gate valve, a hydraulic cylinder, a first photoelectric switch, a second photoelectric switch, a third photoelectric switch and a control box;
the hydraulic pump is connected with the motor through a coupler, the oil absorption filter is arranged in the oil tank and is connected with an oil inlet of the hydraulic pump, an oil outlet of the hydraulic pump is connected with an oil inlet of the electromagnetic directional valve through a one-way valve, a first oil outlet of the electromagnetic directional valve is sequentially connected with the superposition type hydraulic control one-way valve, the superposition type one-way throttle valve, the first electromagnetic valve and the first throttle valve connected with the first electromagnetic valve in parallel, and then is connected with the rod cavity of the hydraulic cylinder after being connected with the first stop valve through a rubber tube, and a second oil outlet of the electromagnetic directional valve is sequentially connected with the superposition type hydraulic control one-way valve, the superposition type one-way throttle valve, the second electromagnetic valve and the second throttle valve connected with the second electromagnetic valve in parallel, and then; a piston rod of the hydraulic cylinder is connected with the gate valve rod through a connecting block; the first photoelectric switch, the second photoelectric switch and the third photoelectric switch are fixed between the gate valve and the hydraulic cylinder so as to detect the position of the connecting block; when the connecting block is positioned at the position of the first photoelectric switch, the gate valve is completely closed; when the connecting block is positioned at the position of the second photoelectric switch, the gate valve is completely opened; when the connecting block is positioned at the position of the third photoelectric switch, the gate valve is partially opened; an oil outlet of the hydraulic pump is connected with an oil tank through a first overflow valve, an oil return port of the electromagnetic directional valve is connected with the oil tank through a second overflow valve, and an oil outlet of the second electromagnetic valve is connected with the oil tank through a third overflow valve; the control box is respectively connected with the first photoelectric switch, the second photoelectric switch, the third photoelectric switch, the first electromagnetic valve, the second electromagnetic valve, the electromagnetic directional valve and the motor through cables.
2. The gate valve hydraulic system for the hydropower station according to claim 1, wherein the gate valve hydraulic system for the hydropower station is further provided with a manual pump and a pressure gauge, an oil inlet of the manual pump is connected with an oil tank through a pipeline, and an oil outlet of the manual pump is connected with an oil inlet of the electromagnetic directional valve; and a first pressure measuring head is arranged on an oil outlet of the manual pump and an oil inlet of the electromagnetic directional valve, and the first pressure measuring head is connected with a pressure gauge through a pressure measuring hose.
3. The gate valve hydraulic system for the hydropower station according to claim 1, wherein a sleeve is arranged between the gate valve and the hydraulic cylinder, two ends of the sleeve are respectively connected with the hydraulic cylinder and the gate valve through flanges, the sleeve is sleeved outside the piston rod, the connecting block and the gate valve rod, and notches are formed in the sleeve for the first photoelectric switch, the second photoelectric switch and the third photoelectric switch to extend into.
4. The gate valve hydraulic system for the hydropower station according to claim 1, wherein a second pressure measuring joint is arranged between the oil return port of the electromagnetic directional valve and the second overflow valve.
5. The gate valve hydraulic system for a hydropower station according to claim 1, wherein a third pressure tap is provided between the first solenoid valve and the first cutoff valve; and a fourth pressure measuring joint is arranged between the second electromagnetic valve and the second stop valve.
6. The gate valve hydraulic system for a hydropower station of claim 1, wherein a liquid level gauge and an air cleaner are provided on the oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022743249.5U CN213655769U (en) | 2020-11-24 | 2020-11-24 | Gate valve hydraulic system for hydropower station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022743249.5U CN213655769U (en) | 2020-11-24 | 2020-11-24 | Gate valve hydraulic system for hydropower station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213655769U true CN213655769U (en) | 2021-07-09 |
Family
ID=76687676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022743249.5U Active CN213655769U (en) | 2020-11-24 | 2020-11-24 | Gate valve hydraulic system for hydropower station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213655769U (en) |
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2020
- 2020-11-24 CN CN202022743249.5U patent/CN213655769U/en active Active
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