CN110106732A - A kind of the horse head driving rope plait and its production method of Macromolecular pouring formula pumping unit - Google Patents
A kind of the horse head driving rope plait and its production method of Macromolecular pouring formula pumping unit Download PDFInfo
- Publication number
- CN110106732A CN110106732A CN201910336712.3A CN201910336712A CN110106732A CN 110106732 A CN110106732 A CN 110106732A CN 201910336712 A CN201910336712 A CN 201910336712A CN 110106732 A CN110106732 A CN 110106732A
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- Prior art keywords
- rope
- high molecular
- polyester fiber
- plait
- horse head
- Prior art date
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Links
- 241001023788 Cyttus traversi Species 0.000 title claims abstract description 34
- 238000005086 pumping Methods 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 229920000573 polyethylene Polymers 0.000 claims abstract description 36
- 239000000835 fiber Substances 0.000 claims abstract description 34
- 229920000728 polyester Polymers 0.000 claims abstract description 32
- 239000000084 colloidal system Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000009940 knitting Methods 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 5
- -1 polyethylene Polymers 0.000 claims description 5
- 238000009954 braiding Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 150000002148 esters Chemical class 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract description 2
- 230000032683 aging Effects 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 description 8
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 241000219422 Urtica Species 0.000 description 1
- 235000009108 Urtica dioica Nutrition 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002627 poly(phosphazenes) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
- D07B1/04—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics with a core of fibres or filaments arranged parallel to the centre line
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
- D07B1/162—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber enveloping sheathing
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B9/00—Binding or sealing ends, e.g. to prevent unravelling
-
- 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
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
- E21B43/127—Adaptations of walking-beam pump systems
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/10—Rope or cable structures
- D07B2201/1012—Rope or cable structures characterised by their internal structure
- D07B2201/102—Rope or cable structures characterised by their internal structure including a core
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/10—Rope or cable structures
- D07B2201/1096—Rope or cable structures braided
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2083—Jackets or coverings
- D07B2201/2084—Jackets or coverings characterised by their shape
- D07B2201/2086—Jackets or coverings characterised by their shape concerning the external shape
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2083—Jackets or coverings
- D07B2201/2089—Jackets or coverings comprising wrapped structures
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2083—Jackets or coverings
- D07B2201/209—Jackets or coverings comprising braided structures
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/201—Polyolefins
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/2039—Polyesters
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Ropes Or Cables (AREA)
Abstract
A kind of the horse head driving rope plait and its production method of Macromolecular pouring formula pumping unit, are related to the oil rig technical field of cable and pumping unit.It is knitted with polyester fiber rope in high molecular polythene wire rope core periphery, obtains rope body；Cylindricality housing is separately connected by colloid at rope body both ends, and makes annular step surface of the cylindricality housing in the external week setting of rope perpendicular to the protrusion in rope body length direction.Present invention process is simple, reasonable, on the basis of the rope body that high molecular material is formed, connects cylindricality housing at the both ends of rope body, is allowed to integral with the rope bodily form.Integral material of the present invention is all made of high molecular material, has preferable wear-resisting, acidproof, alkaline-resisting, against weather, ageing resistance, is adapted in various adverse circumstances use, greatly reduces the probability of halt production, also avoids frequent maintenance and the cost of labor that produces.
Description
Technical field
The present invention relates to cable production technical fields, are also related to the oil rig technical field of pumping unit.
Background technique
Horse head driving rope plait be pumping unit critical component, middle part ring set on the output end of horse head driving device,
The ring head at horse head driving rope plait both ends then stretches out the pressing plate of polished rod eye, then in two ring heads and the oil pumping for stretching out pressing plate
Bolt is placed between the connector of bar, in the both ends attaching nut of bolt, drives rope plait to be connected with sucker rod horse head with this,
Rope plait is driven to realize that sucker rod is pumped in pumping for underground by horse head.
Existing horse head driving rope plait all uses steel cable cable to be made, since open pit oil mining well operations are in various severe rings
In border, for the service life for improving horse head driving rope plait, it need to also periodically increase temperature lubricating grease (butter) outside steel cable cable and be subject to
Otherwise maintenance is just easily corroded.But nevertheless, horse head driving rope plait need all safeguard guarantor in 1 year
It supports at least twice.Therefore, resulting maintenance shut-downs, more conversion materials, show up that it is high to dispatch cost and cost of labor,
No small financial burden is brought for Petroleum Production enterprise.
Summary of the invention
An object of the present disclosure is to propose that a kind of Macromolecular pouring formula of maintenance cost that can prolong the service life, reduce is taken out
The horse head driving rope plait of oil machine.
Rope body of the present invention is by high molecular polythene wire rope core and is woven in outside the polyester fiber of high molecular polythene wire rope core periphery
Layer composition connects cylindricality housing by colloid respectively at the both ends of the rope body, and the cylindricality housing hangs down in the external week setting of rope
Directly in rope body length direction protrusion annular step surface.
Integral material of the present invention is all made of high molecular material, has preferable wear-resisting, acidproof, alkaline-resisting, against weather, resists
Therefore aging is adapted in various adverse circumstances use.The horse head driving rope plait 5 years non-maintaining, greatly reduces halt production
Probability, also avoid frequent maintenance and the cost of labor that produces.
In use, must only drive horse head obtained in the middle part of rope plait, ring set, will on the output end of horse head driving device
The cylindricality housing at both ends stretches out the pressing plate lower end of polished rod eye, so that it may drive rope plait and pressing plate to be formed horse head and position, then pass through
The connector of bolt and sucker rod below polished rod eye pressing plate places, and in the both ends attaching nut of bolt, is just realized with this
Horse head driving rope plait is connected with sucker rod, achieves that the sucker rod in the upper and lower past of underground by horse head driving plait of restricting
Multiple movement is pumped.
Further, in order to improve the tensile strength of product, reduce elongation, the high molecular polythene wire rope core by 8~
16 strands of high molecular polythene rope woollen yarn knittings are made, and the polyester fiber outer layer is made of 32~48 strands of polyester fiber woollen yarn knittings.
Another object of the present invention is to propose the production of the horse head driving rope plait of the above Macromolecular pouring formula pumping unit
Method.
Production method of the present invention the following steps are included:
1) woollen yarn knitting is carried out with high molecular polythene rope and forms high molecular polythene wire rope core, with polyester fiber rope in high molecular polythene
Wire rope core periphery woollen yarn knitting obtains rope body；
2) cylindricality housing is separately connected by colloid at rope body both ends, and make the cylindricality housing be arranged in rope external week perpendicular to
The annular step surface of the protrusion in rope body length direction.
Present invention process is simple, reasonable, on the basis of the rope body that high molecular material is formed, connects cylindricality at the both ends of rope body
Housing is allowed to integral with the rope bodily form.
Further, the present invention first knits to form polyphosphazene polymer second in step 1) with 8~16 strands of high molecular polythene ropes
Alkene wire rope core, then packaging type braiding is carried out in wire rope core periphery with 32~48 strands of polyester fiber ropes.The stretching of product can be greatly improved
Intensity reduces elongation.
One end setting of the separate rope end of cylindricality housing of the present invention has the annular bottom of central through hole.It is logical by center
Hole can pass through rope body, and can form the biggish inner cavity of cylindricality housing, gently to dissipate each strand and colloid, be conducive in each group
Pass through colloid before nettle mutually to solidify, the solidification being also conducive to before cylindricality housing and colloid.
The connection method of each newel post's shape housing is:
On rope body, at the distance away from 10~15cm of rope end, loosening formula is carried out with polyester fiber cord and is tied up；
Rope end is penetrated into cylindricality housing from the central through hole at annular bottom together with the rope body section for tying up polyester fiber cord, then will
The polyester fiber rope and high molecular polythene rope of rope end other than the rope body section for tying up polyester fiber cord implement ravelled spot
Reason；
The rope body section for tying up polyester fiber cord is extracted out cylindricality housing from central through hole, by loose polyester fiber rope and high score
Sub- polyethylene rope fills in cylindricality housing inner cavity after carrying out uniform stressed processing, then is uniformly injected into colloid to cylindricality housing inner cavity, passes through
Solidification,.
The present invention is tied up by polyester fiber cord, the effective length of product can be fixed up, prevent it is too long or
The strand of too short loose polyester fiber rope and high molecular polythene rope causes the intensity of product to decline.The present invention is by by rope end
The loose polyester fiber rope and high molecular polythene rope of end are dispersed, and keep each polyester fiber rope and high molecular polythene rope each
The uniform force degree of strand reaches the rope plait using after effective length, and make between each rope strand, between each fiber, each rope strand
Be filled with colloid between cylindricality housing, form intact solidification, improve whole horse head driving rope plait rope fracture strength and
Service life.
The present invention also by will it is loose after high molecular polythene rope carry out every two strands of Fasteners respectively, then again with high score
The method that cylindricality housing inner cavity is filled in after sub- polyethylene rope dispersion mixing, to reinforce the curability between high molecular polythene rope,
Improve the fracture strength and service life of whole horse head driving rope plait rope.
Specific embodiment
One, production craft step:
1, cable is woven:
It first knits to form high molecular polythene wire rope core with 8~16 strands of high molecular polythene ropes, then in wire rope core periphery with 32~48 strands
Polyester fiber rope carries out packaging type braiding, obtains the continuous cable that polyester fiber rope is wrapped up outside wire rope core.
2, rope body is obtained:
According to the length requirement that uses of pumping unit from continuous cable, the rope body that one segment length of interception is 12.3m.
3, prepare cylindricality housing:
Cylindricality housing is formed by the nylon rod of casting, and it is flat to be provided with one end of manufactured cylindricality housing, flat
Center open up with the comparable central through hole of cable diameter, the other end is then open type.
4, rope body both ends it is each fix a cylindricality housing, manufacturing process is:
At the distance away from one end 10~15cm of rope end, loosening formula is carried out with polyester fiber cord and is tied up, section is tied up in formation
Length is 5cm.
By rope end together with cylindricality housing is penetrated in the central through hole for tying up the certainly annular bottom of section, so that the open end of cylindricality housing
Towards rope end, it then will be located at the polyester fiber rope for tying up the rope end other than section and high molecular polythene rope implement loose handling.
Under the premise of guaranteeing effective length that the rope uses, will it is loose after every two stock of high molecular polythene rope other beat
It knots.
Section will be tied up from central through hole pumpback, make to tie up section be located at cylindricality housing it is flat other than, to loose polyester fiber
The free end of rope and high molecular polythene rope is stretched, and is filled in remixing in cylindricality housing after extending each rope uniform force
Chamber.
Colloid is injected to cylindricality housing inner cavity, makes to be formed between polyester fiber rope, high molecular polythene rope and cylindricality housing
Solidification,.
Since the diameter of the flat central through hole of cylindricality housing is suitable with cable diameter, two rope ends of formation
The flat annular step surface for forming the protrusion perpendicular to rope body length direction of cylindricality housing.
Two, product quality indicator:
The above product is subjected to quality analysis, each index is as follows:
1, fusing point: 160 DEG C of wire rope core, 265 DEG C of outer layer.
2, elongation at break: 4~5%.
3, water imbibition: nothing.
4, antiultraviolet, anti-corrosive properties: good.
5, use environment: -40 DEG C~60 DEG C.
6, wearability: very good.
7, knot strength loss: 10%.
8, minimum fracture strength: reach GB/T30668-2014 standard requirements.
Three, it applies:
Ring set in the middle part of rope plait is driven to stretch the cylindricality housing at both ends on the output end of horse head driving device horse head obtained
The pressing plate lower end of polished rod eye out, so that it may drive rope plait and pressing plate to be formed horse head and position, and will not glue tripping plate, then by outstanding
On the ring head of the connector for the sucker rod that bolt below rope device pressing plate places, in the both ends attaching nut of bolt, just with this
Being connected for horse head driving rope plait and sucker rod is realized, achieves that sucker rod in the upper of underground by horse head driving plait of restricting
Lower reciprocating motion is pumped.
Through on probation in multiple oil wells, product reaches at least 5 years or more service life.
Claims (8)
1. a kind of horse head driving rope plait of Macromolecular pouring formula pumping unit, including rope body, it is characterised in that the rope body is by height
Molecular polyethylene wire rope core and the polyester fiber outer layer composition for being woven in high molecular polythene wire rope core periphery, at the both ends of the rope body
Respectively cylindricality housing is connected by colloid, the cylindricality housing is in the external week setting of rope perpendicular to the protrusion in rope body length direction
Annular step surface.
2. the horse head driving rope plait of Macromolecular pouring formula pumping unit according to claim 1, it is characterised in that the high score
Sub- polyethylene wire rope core is made of 8~16 strands of high molecular polythene rope woollen yarn knittings.
3. the horse head driving rope plait of Macromolecular pouring formula pumping unit according to claim 1 or claim 2, it is characterised in that described poly-
Ester fiber outer layer is made of 32~48 strands of polyester fiber woollen yarn knittings.
4. the production method of the horse head driving rope plait of Macromolecular pouring formula pumping unit as described in claim 1, it is characterised in that
The following steps are included:
1) woollen yarn knitting is carried out with high molecular polythene rope and forms high molecular polythene wire rope core, with polyester fiber rope in high molecular polythene
Wire rope core periphery woollen yarn knitting obtains rope body；
2) cylindricality housing is separately connected by colloid at rope body both ends, and make the cylindricality housing be arranged in rope external week perpendicular to
The annular step surface of the protrusion in rope body length direction.
5. the production method of the horse head driving rope plait of Macromolecular pouring formula pumping unit, feature exist according to claim 4
In in step 1), first knit to form high molecular polythene wire rope core with 8~16 strands of high molecular polythene ropes, then wire rope core periphery with
32~48 strands of polyester fiber ropes carry out packaging type braiding.
6. the production method of the horse head driving rope plait of Macromolecular pouring formula pumping unit, feature exist according to claim 5
There is the annular bottom of central through hole in one end setting of the separate rope end of the cylindricality housing.
7. the production method of the horse head driving rope plait of Macromolecular pouring formula pumping unit, feature exist according to claim 6
In in step 2, the connection method of each newel post's shape housing is:
On rope body, at the distance away from 10~15cm of rope end, loosening formula is carried out with polyester fiber cord and is tied up；
Rope end is penetrated into cylindricality housing from the central through hole at annular bottom together with the rope body section for tying up polyester fiber cord, then will
The polyester fiber rope and high molecular polythene rope of rope end other than the rope body section for tying up polyester fiber cord implement ravelled spot
Reason；
The rope body section for tying up polyester fiber cord is extracted out cylindricality housing from central through hole, by loose polyester fiber rope and high score
Sub- polyethylene rope fills in cylindricality housing inner cavity after carrying out uniform stressed extension, then injects colloid to cylindricality housing inner cavity, cured,
?.
8. the production method of the horse head driving rope plait of Macromolecular pouring formula pumping unit, feature exist according to claim 7
In will it is loose after high molecular polythene rope carry out every two strands of Fasteners respectively, then again with high molecular polythene rope dispersion mixing
After fill in cylindricality housing inner cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910336712.3A CN110106732B (en) | 2019-04-25 | 2019-04-25 | Horsehead driving rope braid of polymer pouring type pumping unit and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910336712.3A CN110106732B (en) | 2019-04-25 | 2019-04-25 | Horsehead driving rope braid of polymer pouring type pumping unit and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110106732A true CN110106732A (en) | 2019-08-09 |
| CN110106732B CN110106732B (en) | 2020-12-01 |
Family
ID=67486608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910336712.3A Active CN110106732B (en) | 2019-04-25 | 2019-04-25 | Horsehead driving rope braid of polymer pouring type pumping unit and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110106732B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01104890A (en) * | 1987-10-15 | 1989-04-21 | Asahi Chem Ind Co Ltd | Non-metallic end stopping method of polyoxymethylene rope |
| US6089008A (en) * | 1998-04-27 | 2000-07-18 | Wellington Leisure Products, Inc. | Line splice and method of forming same |
| KR101058400B1 (en) * | 2011-05-11 | 2011-08-26 | 이병규 | Wire rope and method for forming ring in the same |
| KR101093518B1 (en) * | 2011-02-07 | 2011-12-14 | (주)고려기업 | Wire rope sling with transparent reinforcement member, and its manufacturing device and method |
| CN105178918A (en) * | 2015-07-20 | 2015-12-23 | 中国石油天然气股份有限公司 | Hair braid for oil pumping unit |
| KR101590383B1 (en) * | 2015-09-17 | 2016-02-01 | 대광기업 주식회사 | Manufacturing method for wire rope sling |
| KR101663456B1 (en) * | 2015-09-04 | 2016-10-14 | 대광기업 주식회사 | Wire rope sling and manufacturing method for wire rope sling |
| CN207468953U (en) * | 2017-09-28 | 2018-06-08 | 浙江四兄绳业有限公司 | A kind of high intensity towline |
-
2019
- 2019-04-25 CN CN201910336712.3A patent/CN110106732B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01104890A (en) * | 1987-10-15 | 1989-04-21 | Asahi Chem Ind Co Ltd | Non-metallic end stopping method of polyoxymethylene rope |
| US6089008A (en) * | 1998-04-27 | 2000-07-18 | Wellington Leisure Products, Inc. | Line splice and method of forming same |
| KR101093518B1 (en) * | 2011-02-07 | 2011-12-14 | (주)고려기업 | Wire rope sling with transparent reinforcement member, and its manufacturing device and method |
| KR101058400B1 (en) * | 2011-05-11 | 2011-08-26 | 이병규 | Wire rope and method for forming ring in the same |
| CN105178918A (en) * | 2015-07-20 | 2015-12-23 | 中国石油天然气股份有限公司 | Hair braid for oil pumping unit |
| KR101663456B1 (en) * | 2015-09-04 | 2016-10-14 | 대광기업 주식회사 | Wire rope sling and manufacturing method for wire rope sling |
| KR101590383B1 (en) * | 2015-09-17 | 2016-02-01 | 대광기업 주식회사 | Manufacturing method for wire rope sling |
| CN207468953U (en) * | 2017-09-28 | 2018-06-08 | 浙江四兄绳业有限公司 | A kind of high intensity towline |
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| Publication number | Publication date |
|---|---|
| CN110106732B (en) | 2020-12-01 |
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