CN111439694B - Direct driving device for hoisting type oil pumping machine - Google Patents
Direct driving device for hoisting type oil pumping machine Download PDFInfo
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- CN111439694B CN111439694B CN202010250356.6A CN202010250356A CN111439694B CN 111439694 B CN111439694 B CN 111439694B CN 202010250356 A CN202010250356 A CN 202010250356A CN 111439694 B CN111439694 B CN 111439694B
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- motor
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- 238000005086 pumping Methods 0.000 title claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 230000009467 reduction Effects 0.000 claims abstract description 3
- 230000009471 action Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000011900 installation process Methods 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/02—Driving gear
- B66D1/12—Driving gear incorporating electric motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/30—Rope, cable, or chain drums or barrels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D2700/00—Capstans, winches or hoists
- B66D2700/03—Mechanisms with latches or braking devices in general for capstans, hoists or similar devices as well as braking devices actuated electrically or by fluid under pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention belongs to the field of oil field oil extraction equipment, and particularly relates to a direct driving device of a winch type oil pumping unit, which comprises a roller and a motor, wherein the motor is arranged in the roller; a support shaft A and a support shaft B are respectively arranged at the centers of two end faces of the roller, so that the roller is supported on a base of the oil pumping unit, the support shaft A is in fit connection with the roller through rectangular transmission threads, and the support shaft B is in slide fit connection with the roller; the motor structurally comprises a stator and a rotor, a motor output shaft is arranged in the center of the stator, one end of the motor output shaft is connected with the shaft end of a support shaft B through a key connection structure, the other end of the motor output shaft extends to the outside of the stator, and a speed reduction mechanism is arranged between the motor output shaft and the support shaft A; the invention creatively integrates the motor and the roller into a whole, effectively reduces the volume of the driving mechanism, thereby reducing the occupation of space in the production, transportation and installation processes of the equipment.
Description
Technical Field
The invention belongs to the field of oil field oil extraction equipment, and particularly relates to a direct driving device of a winch type oil pumping unit.
Background
In the oil recovery technical field, a dependence wire rope traction drive's beam-pumping unit has appeared in recent years, and its structure includes walking beam, support, cylinder and is used for driving the motor of cylinder, and the support is fixed in ground, and the middle part of walking beam passes through the bearing support and supports at the top of support, and the both ends of walking beam are connected with the haulage rope respectively, and after exerting the pulling force to the haulage rope through drive arrangement, the walking beam alright swing under the pulling force effect of haulage rope, accomplish the action of pumping oil. Compared with the traditional beam pumping unit driven by a crank-link mechanism, the special pumping unit has the advantages of simpler structure, higher mechanical transmission efficiency, and obviously better energy-saving effect than the traditional beam pumping unit after the balance is adjusted by adopting a proper balance weight. In this type of pumping unit, the drive means acts to apply traction to the cable to power the oscillation of the walking beam. However, in the production practice, it has been found that the pumping unit driving mechanism composed of the roller and the motor has some disadvantages: 1. the motor is separated from the roller, so that the problems of overlarge volume and irregular appearance of the pumping unit are caused; 2. in the prior art, in the rotation process of a roller, a traction rope wound on the roller can continuously deviate along the axial direction of the roller, and the deviation can cause the problem that the traction rope is abraded too fast; 3. the braking mechanism of the existing pumping unit has large volume, complex structure and higher manufacturing cost. Therefore, a new technical solution is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a direct driving device of a winch type oil pumping unit, which aims to solve the problems in the background technology.
The technical problem solved by the invention is realized by adopting the following technical scheme:
the invention comprises a roller and a motor, wherein the motor is arranged in the roller;
a support shaft A and a support shaft B are respectively arranged at the centers of two end faces of the roller, so that the roller is supported on a base of the oil pumping unit, the support shaft A is in fit connection with the roller through rectangular transmission threads, and the support shaft B is in slide fit connection with the roller;
the motor structurally comprises a stator and a rotor, a motor output shaft is arranged in the center of the stator, one end of the motor output shaft is connected with the shaft end of a support shaft B through a key connection structure, the other end of the motor output shaft extends to the outside of the stator, and a speed reduction mechanism is arranged between the motor output shaft and the support shaft A;
the speed reducing mechanism comprises a sun gear, a planetary gear carrier and an inner gear ring, wherein the sun gear is fixed on the output shaft of the motor, one side of the planetary gear carrier is connected with the shaft end of the support shaft A through a key connection structure, the other side of the planetary gear carrier is connected with the shaft end of the output shaft of the motor through a bearing, the planetary gear is installed on the planetary gear carrier through a short shaft, the inner gear ring is processed on the inner side of the roller, and the planetary gear is simultaneously meshed with the sun gear and the inner gear ring;
a spiral rope groove for winding a traction rope is processed on the outer side of the roller;
the thread pitch of the rectangular transmission thread on the support shaft A is the same as that of the spiral rope groove.
As a further technical scheme, a brake mechanism is arranged on the support shaft A, the brake mechanism comprises a plurality of limit pins and a slide rod for driving the limit pins, each limit pin is inserted into the bottom of a thread groove at the root of the rectangular transmission thread and is distributed at equal intervals along the thread groove, the axis of each limit pin is along the diameter direction of the support shaft A, an axial hole is processed on the support shaft A, the slide rod is inserted into the axial hole, mutually matched inclined planes are processed on the slide rod and the limit pins, and when the slide rod moves axially, all the limit pins move radially under the action of the inclined planes;
the slide bar is driven by a push-pull electromagnet.
According to a further technical scheme, a rope clamping mechanism is arranged in the spiral rope groove and structurally comprises a clamping block A and a clamping block B, the clamping block A and the clamping block B are connected to the roller in a sliding mode through dovetail grooves, an included angle formed by the length directions of the two dovetail grooves is an acute angle, the clamping block A and the clamping block B are installed on the roller through screws, and the clamping block A and the clamping block B keep a movement trend away from the axis of the roller under the action of a spring.
The invention has the beneficial effects that:
1. the invention creatively integrates the motor and the roller into a whole, and mainly produces two effects: on one hand, the volume of the driving mechanism is effectively reduced, so that the space occupation in the production, transportation and installation processes of the equipment is reduced; on the other hand, when the driving device is maintained, the pumping unit can be rapidly recovered to operate in a mode of integrally replacing the driving device, and the adverse effect on production caused by maintenance shutdown is reduced.
2. In the invention, when the rotary drum works, the support shaft A, the support shaft B and the stator of the motor are fixed, the rotor of the motor rotates after being electrified, the rotor transmits power to the rotary drum through the speed reducer so as to drive the rotary drum to rotate, and the rotary drum axially moves under the action of the rectangular transmission threads on the support shaft A in the rotating process of the rotary drum. At the same time, the contact position between the traction rope and the spiral rope groove is axially moved during the rotation of the roller. When the moving speed of the two axial moving devices is the same and the moving direction is opposite, the contact position between the traction rope and the spiral rope groove and the state of keeping the distance from the support shaft A to be relatively constant can be realized, so that the traction rope wound on the roller can not deviate along the axial direction of the roller in the rotating process of the roller, the abrasion speed of the traction rope is effectively reduced, and the service life of the traction rope is prolonged.
3. According to the invention, the limiting pin is arranged at the bottom of the thread groove of the rectangular transmission thread on the supporting shaft A, and through the limiting pin, after the limiting pin extends out of the bottom of the thread groove, the thread transmission between the roller and the supporting shaft A is stopped, so that the roller is braked.
Drawings
FIG. 1 is a schematic view of the internal structure of the present invention;
FIG. 2 is an external structural view of the present invention;
fig. 3 is a schematic view of the installation structure of the brake mechanism in the support shaft a;
FIG. 4 is a schematic structural view of the rope clamping mechanism;
fig. 5 is a schematic view of a beam-pumping unit incorporating the present invention.
In the figure: 1-support shaft A, 2-rectangular transmission thread, 3-inner gear ring, 4-planet gear carrier, 5-short shaft, 6-planet gear, 7-central gear, 8-motor output shaft, 9-support shaft B, 10-stator, 11-roller, 12-spiral rope groove, 13-traction rope, 14-slide bar, 15-limit pin, 16-inclined plane, 17-thread groove, 18-spring, 19-clamp block A, 20-clamp block B, 21-screw, 22-rotor and 23-dovetail groove.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the present embodiment includes a drum 11 and a motor disposed inside the drum 11. By building the motor inside the drum 11, two main effects are produced: on one hand, the volume of the driving mechanism is effectively reduced, so that the space occupation in the production, transportation and installation processes of the equipment is reduced; on the other hand, when the driving device is maintained, the pumping unit can be rapidly recovered to operate in a mode of integrally replacing the driving device, and the adverse effect on production caused by maintenance shutdown is reduced. Specifically, in the present invention, a support shaft a1 and a support shaft B9 are respectively installed at the center of both end surfaces of the drum 11, thereby supporting the drum 11 on the base of the pumping unit. In operation, support shaft A1 and support shaft B9 are fixed to the pumping unit base and do not rotate, while roller 11 is driven by the motor to rotate.
The supporting shaft A1 is connected with the roller 11 in a matching way through a rectangular transmission thread 2, and the supporting shaft B is connected with the roller 11 in a sliding matching way. Such a construction allows the drum 11 to be axially moved while rotating, thereby offsetting the deviation of the contact point between the traction rope 13 and the drum 11, and finally achieving the effect of reducing the wear of the traction rope 13.
In order to place the motor in the drum 11 and ensure that the power of the motor is transmitted to the winding drum, the problems of how to support the motor and how to arrange a speed reducing mechanism need to be considered, in the invention, the structure of the motor comprises a stator 10 and a rotor 22, a motor output shaft 8 is arranged in the center of the stator 10, one end of the motor output shaft 8 is connected with the shaft end of a support shaft B9 through a key connection structure, the other end of the motor output shaft 8 extends to the outside of the stator 10, and the speed reducing mechanism is arranged between the motor output shaft 8 and the support shaft A1. In the present embodiment, wire passing holes are provided in the center and the side of the supporting shaft B9, and the power wires of the motor are led to the inside of the drum 11 through the wire passing holes, so as to supply power to the stator 10 of the motor.
When the rotary drum is in operation, the supporting shaft A1, the supporting shaft B9 and the stator 10 of the motor are all fixed, the rotor 22 of the motor rotates after being electrified, the rotor 22 transmits power to the rotary drum 11 through the speed reducing device, so that the rotary drum 11 is driven to rotate, and in the rotating process of the rotary drum 11, the rotary drum 11 moves axially under the action of the rectangular transmission threads 2 on the supporting shaft A1. At the same time, the contact position between the traction rope 13 and the spiral rope groove 12 is also shifted in the axial direction during the rotation of the drum 11. When the two axial movements have the same moving speed and opposite moving directions, the contact position between the traction rope 13 and the spiral rope groove 12 and the support shaft a1 can be kept in a relatively constant distance state (i.e. the contact position between the traction rope 13 and the spiral rope groove 12 is stationary relative to the base of the pumping unit), so that the traction rope 13 wound on the drum 11 cannot deviate along the axial direction of the drum 11 in the rotation process of the drum 11, the abrasion speed of the traction rope 13 is effectively reduced, and the service life of the traction rope 13 is prolonged.
The speed reducing mechanism comprises a sun gear 7, a planetary gear 6, a planetary gear carrier 4 and an inner gear ring 3, wherein the sun gear 7 is fixed on the motor output shaft 8, one side of the planetary gear carrier 4 is connected with the shaft end of a support shaft A1 through a key connection structure, the other side of the planetary gear carrier 4 is connected with the shaft end of the motor output shaft 8 through a bearing, the planetary gear 6 is installed on the planetary gear carrier 4 through a short shaft 5, the inner gear ring 3 is processed on the inner side of the roller 11, and the planetary gear 6 is simultaneously meshed with the sun gear 7 and the inner gear ring 3. It should be noted that the width of the ring gear 3 must be sufficient to prevent the ring gear 3 from being disengaged from the planetary gears 6 when the drum 11 is moved axially.
The outer side of the roller 11 is provided with a spiral rope groove 12 for winding a traction rope 13, and the roller 11 applies a pulling force to the traction rope 13 through the friction action between the spiral rope groove 12 and the traction rope 13. In order to ensure sufficient friction, the number of windings of the traction rope 13 on the drum 11 may be suitably increased.
The pitch of the rectangular drive thread 2 on the support shaft a1 is the same as the pitch of the helical groove 12, so that the axial movement of the drum 11 and the movement of the traction rope 13 itself in the helical groove 12 are exactly offset.
As a further technical scheme, a braking mechanism is arranged on the supporting shaft a1, the braking mechanism comprises a limiting pin 15 and a sliding rod 14 for driving the limiting pin 15, the limiting pin 15 is provided with a plurality of limiting pins, each limiting pin 15 is inserted into the bottom of a thread groove 17 at the root of the rectangular transmission thread 2 and is distributed along the thread groove 17 at equal intervals, the axis of the limiting pin 15 is along the diameter direction of the supporting shaft a1, an axial hole is processed on the supporting shaft a1, the sliding rod 14 is inserted into the axial hole, mutually matched inclined surfaces 16 are processed on the sliding rod 14 and the limiting pin 15, and when the sliding rod 14 moves axially, all the limiting pins 15 move radially under the action of the inclined surfaces 16; the slide 14 is driven by a push-pull electromagnet, which may also be manually driven. When the slide bar 14 is slid leftward in the state shown in fig. 3, the position-limiting function of the position-limiting pin 15 by the slide bar 14 is released, and at this time, the position-limiting pins 15 located on both inner and outer sides of the drum 11 are sprung outward by the spring 18, so that the rotation of the drum 11 is blocked from both the inner and outer sides of the drum 11, and the position-limiting pins 15 located in the screw-fitting section are not sprung up by the restriction of the drum 11. After the limiting pin 15 extends out of the groove bottom of the thread groove 17, thread transmission between the roller 11 and the supporting shaft A1 is stopped, so that braking on the roller 11 is realized.
As shown in FIG. 4, as a further technical solution, a rope clamping mechanism is arranged in the spiral rope groove 12, and the structure of the rope clamping mechanism comprises a clamping block A19 and a clamping block B20, the clamping block A19 and the clamping block B20 are both connected to the roller 11 in a sliding manner through a dovetail groove 23, an included angle between the length directions of the two dovetail grooves 23 is an acute angle, the clamping block A19 and the clamping block B20 are mounted on the roller 11 through screws 21, and the clamping block A19 and the clamping block B20 keep a moving trend away from the axis of the roller 11 under the action of a spring 18. When the haulage rope 13 leans on to spiral grooving 12, the rope clamping mechanism can press from both sides haulage rope 13 tightly automatically, when haulage rope 13 kept away from spiral grooving 12, the rope clamping mechanism can release haulage rope 13 automatically, does so and can effectively increase the frictional force between haulage rope 13 and the spiral grooving 12.
Claims (2)
1. The utility model provides a hoist formula beam-pumping unit direct drive device, includes cylinder (11) and motor, its characterized in that: the motor is arranged inside the roller (11);
a supporting shaft A (1) and a supporting shaft B (9) are respectively installed at the centers of two end faces of the roller (11), so that the roller (11) is supported on a base of the oil pumping unit, the supporting shaft A (1) is in matched connection with the roller (11) through a rectangular transmission thread (2), and the supporting shaft B is in sliding matched connection with the roller (11);
the motor structurally comprises a stator (10) and a rotor (22), a motor output shaft (8) is arranged in the center of the stator (10), one end of the motor output shaft (8) is connected with the shaft end of a support shaft B (9) through a key connection structure, the other end of the motor output shaft (8) extends to the outside of the stator (10), and a speed reduction mechanism is arranged between the motor output shaft (8) and the support shaft A (1);
the speed reducing mechanism comprises a central gear (7), a planetary gear (6), a planetary gear carrier (4) and an inner gear ring (3), wherein the central gear (7) is fixed on the motor output shaft (8), one side of the planetary gear carrier (4) is connected with the shaft end of the support shaft A (1) through a key connection structure, the other side of the planetary gear carrier (4) is connected with the shaft end of the motor output shaft (8) through a bearing, the planetary gear (6) is installed on the planetary gear carrier (4) through a short shaft (5), the inner gear ring (3) is processed on the inner side of the roller (11), and the planetary gear (6) is simultaneously meshed with the central gear (7) and the inner gear ring (3);
a spiral rope groove (12) for winding a traction rope (13) is processed on the outer side of the roller (11);
the pitch of the rectangular transmission thread (2) on the support shaft A (1) is the same as that of the spiral rope groove (12);
the brake mechanism is arranged on the support shaft A (1), the brake mechanism comprises a limiting pin (15) and a plurality of sliding rods (14) used for driving the limiting pin (15), each limiting pin (15) is inserted into the bottom of a thread groove (17) at the root of the rectangular transmission thread (2) and distributed at equal intervals along the thread groove (17), the axis of each limiting pin (15) is along the diameter direction of the support shaft A (1), an axial hole is machined in the support shaft A (1), the sliding rods (14) are inserted into the axial holes, mutually matched inclined planes (16) are machined on the sliding rods (14) and the limiting pins (15), and when the sliding rods (14) axially move, all the limiting pins (15) radially move under the action of the inclined planes (16);
the slide bar (14) is driven by a push-pull electromagnet.
2. The direct drive device of a hoisting pumping unit according to claim 1, characterized in that: be provided with in spiral rope groove (12) and press from both sides rope mechanism, its structure includes clamp splice A (19) and clamp splice B (20), clamp splice A (19) and clamp splice B (20) all through dovetail (23) sliding connection in cylinder (11) on and the contained angle of the length direction of two dovetail (23) be the acute angle, clamp splice A (19) and clamp splice B (20) are installed on cylinder (11) through screw (21), clamp splice A (19) and clamp splice B (20) keep away from the motion trend of cylinder (11) axis under spring (18) effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010250356.6A CN111439694B (en) | 2020-04-01 | 2020-04-01 | Direct driving device for hoisting type oil pumping machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010250356.6A CN111439694B (en) | 2020-04-01 | 2020-04-01 | Direct driving device for hoisting type oil pumping machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111439694A CN111439694A (en) | 2020-07-24 |
| CN111439694B true CN111439694B (en) | 2020-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010250356.6A Active CN111439694B (en) | 2020-04-01 | 2020-04-01 | Direct driving device for hoisting type oil pumping machine |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2494819Y (en) * | 2001-03-27 | 2002-06-12 | 上海英明起重机械制造有限公司 | Electric controlling hoister |
| CN201574056U (en) * | 2009-12-16 | 2010-09-08 | 中船华南船舶机械有限公司 | Winch with function of force moment limit and protection |
| CN202063661U (en) * | 2011-05-19 | 2011-12-07 | 浙江海洋学院 | Winch |
| CN102341339A (en) * | 2009-03-02 | 2012-02-01 | 通用电气公司 | Drive assembly and apparatus for hoist |
| CN202785417U (en) * | 2012-09-07 | 2013-03-13 | 江阴市福达船舶配件制造有限公司 | Electric transmission planetary gear mechanism-hidden-in-drum type winch |
| CN206156640U (en) * | 2016-11-07 | 2017-05-10 | 赵建新 | Miniature lifting machine of frequency conversion control adjustable speed |
-
2020
- 2020-04-01 CN CN202010250356.6A patent/CN111439694B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2494819Y (en) * | 2001-03-27 | 2002-06-12 | 上海英明起重机械制造有限公司 | Electric controlling hoister |
| CN102341339A (en) * | 2009-03-02 | 2012-02-01 | 通用电气公司 | Drive assembly and apparatus for hoist |
| CN201574056U (en) * | 2009-12-16 | 2010-09-08 | 中船华南船舶机械有限公司 | Winch with function of force moment limit and protection |
| CN202063661U (en) * | 2011-05-19 | 2011-12-07 | 浙江海洋学院 | Winch |
| CN202785417U (en) * | 2012-09-07 | 2013-03-13 | 江阴市福达船舶配件制造有限公司 | Electric transmission planetary gear mechanism-hidden-in-drum type winch |
| CN206156640U (en) * | 2016-11-07 | 2017-05-10 | 赵建新 | Miniature lifting machine of frequency conversion control adjustable speed |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111439694A (en) | 2020-07-24 |
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