CN114101044A - Device for rapidly detecting aggregate needle sheet shape for concrete and use method - Google Patents
Device for rapidly detecting aggregate needle sheet shape for concrete and use method Download PDFInfo
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- CN114101044A CN114101044A CN202111415520.5A CN202111415520A CN114101044A CN 114101044 A CN114101044 A CN 114101044A CN 202111415520 A CN202111415520 A CN 202111415520A CN 114101044 A CN114101044 A CN 114101044A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 claims description 25
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims 2
- 238000012031 short term test Methods 0.000 claims 1
- 239000000047 product Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 6
- 238000012216 screening Methods 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000004575 stone Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
- B07B1/30—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro within their own plane in or approximately in or transverse to the direction of conveyance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/23—Devices for tilting and emptying of containers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a device for rapidly detecting aggregate needle sheets for concrete and a using method thereof, belonging to the technical field of road engineering.
Description
Technical Field
The invention belongs to the field of road engineering, and particularly relates to a device for rapidly detecting aggregate needle sheets for concrete and a using method thereof.
Background
The method for detecting the content of needle-shaped flaky particles of cement concrete coarse aggregates in the highway engineering industry at present mainly depends on a standard instrument method of T0311-2005 in the Industrial Standard road engineering aggregate test Specification JTG E42-2005, and the method is characterized in that a detector manually compares and selects needle-shaped aggregates meeting the standard requirements through the standard instrument, so that time and labor are consumed, the timeliness of a detection task is influenced, and the investment of the detector is increased.
The reason for the aggregate needle flake is mainly related to the physical properties of the stone material and the selected crushing machine, production process and the like. Generally, limestone with lower compressive strength is easier to generate more needle-shaped pieces than basalt with higher compressive strength during crushing. In the processing process, the crusher mainly based on extrusion crushing has high aggregate needle sheet content, such as a jaw crusher and the like, and the impact method is used for crushing stone to produce less aggregate needle sheets, such as a counterattack crusher and the like.
The reasonable crushing and screening process flow is adopted to reduce the needle sheet shape of the aggregate, for example, after the stone is coarsely crushed or crushed in a crusher, the stone is not directly discharged onto a finished product screen of a final product, 2-3 screening procedures are added, the proportion of the needle sheet shape content of the aggregate can be reduced, and the reasonable crushing and screening process flow is a method for reducing the needle sheet shape content of the aggregate.
The aggregate needle sheet-like content is more harmful in cement concrete: the needle-like aggregate is easy to have an overhead phenomenon in cement concrete, has a large void ratio and is easy to break under pressure, so that the strength of the cement concrete is influenced; when the content of the needle-shaped particles is high, the surface area and the void ratio among aggregates can be increased, so that the fluidity of concrete is reduced, and when concrete pumping is carried out, pipeline blockage is easy to cause, and construction is not facilitated.
Disclosure of Invention
1. Technical problem to be solved by the invention
The object of the present invention is to solve the above mentioned drawbacks.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a device for rapidly detecting aggregate needle sheets for concrete, which comprises a base, a fixed frame, a movable frame, a needle-shaped sieve, a sheet-shaped sieve, a reciprocating mechanism and a flow dividing device, wherein the fixed frame, the reciprocating mechanism and the flow dividing device are fixed on the base, the movable frame is arranged on the fixed frame, the needle-shaped sieve and the sheet-shaped sieve are both arranged on the movable frame, the flow dividing device is positioned below the needle-shaped sieve and the sheet-shaped sieve, the needle-shaped sieve is provided with a plurality of round holes, and the sheet-shaped sieve is provided with a plurality of rectangular holes.
Preferably, the fixed frame is of an H-shaped structure, the upper end of the fixed frame is provided with a rotating seat, the rotating seat horizontally and freely rotates on the fixed frame, the movable frame is connected with the fixed frame through the rotating seat, and the reciprocating mechanism is connected with the movable frame.
Preferably, the adjustable shelf includes mobile jib, connecting rod and two dead levers, and the one end of dead lever is fixed on the mobile jib, and the middle part and the rotation seat of dead lever rotate to be connected, and the mobile jib passes through the connecting rod to be connected with reciprocating mechanism, and needle-like sieve and slice screening are installed respectively on two dead levers.
Preferably, the two fixing rods respectively comprise a first rod and a second rod, the first rod is installed on the rotating seat, the first rod is provided with a rotating motor, the second rod is fixed on an output shaft of the rotating motor, and the needle-shaped sieve and the sheet-shaped sieve are respectively installed on the second rods which are different.
Preferably, the reciprocating mechanism comprises a reciprocating motor, a connecting rod group, a reciprocating rod and a fixed sleeve, the reciprocating motor is connected with the reciprocating rod through the connecting rod group, the reciprocating rod is installed in the fixed sleeve, and the connecting rod is connected with the reciprocating rod.
Preferably, the flow dividing device comprises a collecting box, a flow dividing plate, a separating plate, a needle-shaped sieve and a sheet-shaped sieve, the flow dividing plate is arranged below the collecting box, the collecting box is arranged on the flow dividing plate, and the separating plate is positioned in the middle between the needle-shaped sieve and the sheet-shaped sieve.
Preferably, the displacement zones of the needle and plate screens are located between two diverter plates.
A use method of a device for rapidly detecting aggregate needle sheets for concrete comprises the following steps:
s1, selecting a plurality of aggregates;
s2, shoveling out part of the aggregates from the selected aggregates and adding the parts of the aggregates into the needle-shaped sieve and the sheet-shaped sieve respectively;
s3, starting the reciprocating mechanism to drive the needle-shaped sieve and the sheet-shaped sieve to shake in a reciprocating manner;
s4, collecting the unqualified aggregate falling from the needle-shaped sieve and the sheet-shaped sieve by a collecting box;
s5, rotating the motor to control the needle-shaped sieve and the sheet-shaped sieve to rotate, and pouring qualified aggregate;
s6, repeating the contents of S2-S5 until the selected aggregate is used up;
and S7, respectively bearing the weight of the unqualified needle-shaped materials and the unqualified sheet-shaped materials, and calculating the ratio.
Preferably, the selected amount of aggregate is used for detecting the defective flaky materials, and is used for detecting the defective needle-shaped materials.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the device for rapidly detecting the aggregate needle sheet for concrete can rapidly screen out unqualified products in the aggregate pile, further measure and calculate the proportion of the unqualified products, and is used for detecting the qualification of the aggregate pile.
(2) According to the device for rapidly detecting the aggregate needle sheets for concrete, aggregates of different sizes and specifications can be detected by replacing different needle-shaped sieves and sheet-shaped sieves, and the applicability is high.
(3) According to the device for rapidly detecting the aggregate needle sheet shape for the concrete, the screened unqualified products are collected, the qualified products directly slide out, and the device is very suitable for being used in a construction site.
(4) The device for rapidly detecting the aggregate needle sheet for concrete provided by the invention is electrically screened, and is time-saving and labor-saving.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for rapidly testing aggregate needle shape for concrete according to the present invention;
FIG. 2 is a top view of an apparatus for rapidly testing aggregate needle sheets for concrete according to the present invention;
FIG. 3 is a rear view of an apparatus for rapidly testing aggregate needle sheets for concrete according to the present invention;
fig. 4 is a schematic view of a connection structure of a fixing rod of the apparatus for rapidly testing aggregate needle sheets for concrete according to the present invention.
The reference numerals in the schematic drawings illustrate:
100. a base;
200. a fixed mount; 210. a rotating seat;
300. a movable frame; 310. a main rod; 320. a connecting rod; 330. fixing the rod; 340. rotating the motor;
400. needle-shaped sieves;
500. a sheet sieve;
600. a reciprocating mechanism; 610. a reciprocating motor; 620. a linkage; 630. a reciprocating lever; 640. fixing a sleeve;
700. a flow divider; 710. a collection box; 720. a flow distribution plate; 730. a partition plate.
Detailed Description
In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which may be embodied in many different forms and are not limited to the embodiments described herein, but rather are provided for the purpose of providing a more thorough disclosure of the invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; the terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1 and 4 of the drawings, the apparatus for rapidly detecting aggregate needle sheets for concrete of the embodiment includes a base 100, a fixed frame 200, a movable frame 300, a needle-shaped sieve 400, a sheet-shaped sieve 500, a reciprocating mechanism 600 and a flow dividing device 700, wherein the fixed frame 200, the reciprocating mechanism 600 and the flow dividing device 700 are fixed on the base 100, the movable frame 300 is installed on the fixed frame 200, the needle-shaped sieve 400 and the sheet-shaped sieve 500 are both installed on the movable frame 300, the flow dividing device 700 is located below the needle-shaped sieve 400 and the sheet-shaped sieve 500, the needle-shaped sieve 400 is provided with a plurality of round holes, and the sheet-shaped sieve 500 is provided with a plurality of rectangular holes.
Aggregate is applied to a road, a manufacturer usually carries out primary screening when purchasing, products are all square blocks with the best contact degree with cement concrete, but slender and flat materials are occasionally mixed in the square blocks, when the materials are too much, the aggregate of the batch is unqualified, and therefore the purchased aggregate needs to be screened, the purchased aggregate is huge in amount and can be usually selected and inspected, but manual screening is carried out, the efficiency is low, the aggregate can be screened through the needle screen 400 and the sheet screen 500, the aggregate can be shoveled into the needle screen 400 and the sheet screen 500 through a shovel, the reciprocating mechanism 600 drives the aggregate to shake and screen, and the unqualified products fall down.
The fixing frame 200 of the embodiment is an H-shaped structure, the upper end of the fixing frame 200 is provided with a rotating seat 210, the rotating seat 210 horizontally and freely rotates on the fixing frame 200, the movable frame 300 is connected with the fixing frame 200 through the rotating seat 210, and the reciprocating mechanism 600 is connected with the movable frame 300.
The movable frame 300 of this embodiment includes a main rod 310, a connecting rod 320, and two fixing rods 330, one end of each fixing rod 330 is fixed on the main rod 310, the middle part of each fixing rod 330 is rotatably connected to the rotating base 210, the main rod 310 is connected to the reciprocating mechanism 600 through the connecting rod 320, and the needle screen 400 and the plate screen 500 are respectively installed on the two fixing rods 330.
The two fixing rods 330 of this embodiment each include a first rod and a second rod, the first rod is installed on the rotating base 210, the first rod is provided with a rotating motor 340, the second rod is fixed on an output shaft of the rotating motor 340, and the needle sieve 400 and the sheet sieve 500 are respectively installed on the second different rods.
The reciprocating mechanism 600 of the present embodiment includes a reciprocating motor 610, a linkage 620, a reciprocating rod 630 and a fixing sleeve 640, the reciprocating motor 610 is connected with the reciprocating rod 630 through the linkage 620, the reciprocating rod 630 is installed in the fixing sleeve 640, and the connecting rod 320 is connected with the reciprocating rod 630.
The flow dividing device 700 of the present embodiment includes a collection box 710, a flow dividing plate 720 and a partition plate 730, the flow dividing plate 720 is disposed below the needle-shaped screen 400 and the sheet-shaped screen 500, the collection box 710 is mounted on the flow dividing plate 720, and the partition plate 730 is located in the middle between the needle-shaped screen 400 and the sheet-shaped screen 500.
The displacement area of the needle screen 400 and the sheet screen 500 of this embodiment is located between two diverter plates 720.
Wherein the needle-shaped sieve 400 and the sheet-shaped sieve 500 are connected with the movable frame 300 through a movable rod, and the connecting positions of the movable rod, the needle-shaped sieve 400 and the sheet-shaped sieve 500 can be adjusted, so that the distance between the needle-shaped sieve 400 and the sheet-shaped sieve 500 and the movable frame 300 can be adjusted, the needle-shaped sieve and the sheet-shaped sieve can fall completely when being overturned and poured subsequently, and the needle-shaped sieve and the sheet-shaped sieve are prevented from being mixed in the collecting box 710.
In the design, the reciprocating mechanism 600 drives the main rod 310 to swing through the connecting rod 320, the main rod 310 is connected with the fixing rod 330, the rotating seat 210 below the fixing rod 330 rotates to rotate, the corresponding needle-shaped sieve 400 and the corresponding sheet-shaped sieve 500 shake left and right to sieve materials, the moving range of the needle-shaped sieve 400 and the moving range of the sheet-shaped sieve 500 are located between the two splitter plates 720, and the falling unqualified aggregate can fall into the collection box 710.
The above design is universal, and when the rejected materials are screened by different standards, such as different aggregate sizes in different regions, the sizes of the corresponding rejected products are changed, and the rejected products can be obtained by replacing different needle-shaped screens 400 and different sheet-shaped screens 500.
A use method of a device for rapidly detecting aggregate needle sheets for concrete comprises the following steps:
s1, selecting a plurality of aggregates;
s2, scooping out part of the aggregate from the selected aggregate and adding the part of the aggregate into the needle-shaped sieve 400 and the sheet-shaped sieve 500 respectively;
s3, starting the reciprocating mechanism 600 to drive the needle sieve 400 and the sheet sieve 500 to shake in a reciprocating manner;
s4, collecting box 710 collecting the unqualified aggregate falling from needle screen 400 and sheet screen 500;
s5, controlling the needle sieve 400 and the sheet sieve 500 to rotate by the rotating motor 340, and pouring qualified aggregate;
s6, repeating the contents of S2-S5 until the selected aggregate is used up;
and S7, respectively bearing the weight of the unqualified needle-shaped materials and the unqualified sheet-shaped materials, and calculating the ratio.
The selected amount of aggregate of this example was used for the detection of the flaky nonconforming material in part and for the detection of the needle-like nonconforming material in part.
The needle-like material and the flake-like material screened out above are only called in the industry, and the shapes thereof are not completely similar to needles and flakes, and specific examples are as follows: for convenience of explanation, the aggregate is assumed to be a standard cube, and if the size of the standard usable aggregate is between 4.75 and 9.5, the aggregate needs to be screened out by less than 3.5, so that if a certain aggregate in the aggregate particles is less than 3.5, the aggregate can be screened out by the needle-shaped screen 400, if the aggregate is mixed with less than 3.5, the aggregate is called as a needle-shaped material, if the aggregate is mixed with the particle materials with the length of 6, the width of 4 and the height of 3, the particle materials can not pass through the needle-shaped screen 400 no matter what angle the particle materials enter the needle-shaped screen 400, but the material with the shape is too flat and is not qualified aggregate, and therefore the sheet-shaped screen 500 is needed to screen out.
The above-mentioned embodiments only express a certain implementation mode of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which are within the protection scope of the present invention; therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. The utility model provides a short-term test concrete is with flaky device of needle that gathers materials which characterized in that: including base (100), mount (200), adjustable shelf (300), needle sieve (400), slice sieve (500), reciprocating mechanism (600) and diverging device (700), mount (200), reciprocating mechanism (600) and diverging device (700) are fixed on base (100), adjustable shelf (300) are installed on mount (200), needle sieve (400) and slice sieve (500) are all installed on adjustable shelf (300), diverging device (700) are located the below of needle sieve (400) and slice sieve (500), needle sieve (400) are equipped with a plurality of round hole for being equipped with, be equipped with the rectangular hole of a plurality of on slice sieve (500).
2. The device for rapidly detecting the aggregate needle shape for concrete according to claim 1, is characterized in that: the utility model discloses a reciprocating mechanism, including mount (200), rotation seat (210), adjustable shelf (300), reciprocating mechanism (600) and adjustable shelf (300), mount (200) are H type structure, the upper end of mount (200) is equipped with rotates seat (210), rotate seat (210) the free rotation of level on mount (200), adjustable shelf (300) are connected with mount (200) through rotating seat (210), reciprocating mechanism (600) are connected with adjustable shelf (300).
3. The device for rapidly detecting the aggregate needle shape for concrete according to claim 2, is characterized in that: the adjustable shelf (300) comprises a main rod (310), a connecting rod (320) and two fixing rods (330), one end of each fixing rod (330) is fixed on the main rod (310), the middle of each fixing rod (330) is rotatably connected with a rotating seat (210), the main rod (310) is connected with a reciprocating mechanism (600) through the connecting rod (320), and the needle-shaped sieve (400) and the sheet-shaped sieve (500) are respectively installed on the two fixing rods (330).
4. The device for rapidly detecting the aggregate needle sheet shape for the concrete according to claim 3, is characterized in that: the two fixing rods (330) comprise a first rod and a second rod, the first rod is installed on the rotating seat (210), the first rod is provided with a rotating motor (340), the second rod is fixed on an output shaft of the rotating motor (340), and the needle-shaped sieve (400) and the sheet-shaped sieve (500) are installed on the second rods which are different respectively.
5. The device for rapidly detecting the aggregate needle sheet shape for the concrete according to claim 3, is characterized in that: reciprocating mechanism (600) is including reciprocating motor (610), connecting rod group (620), reciprocating lever (630) and fixed cover (640), reciprocating motor (610) is connected with reciprocating lever (630) through connecting rod group (620), reciprocating lever (630) are installed in fixed cover (640), connecting rod (320) are connected with reciprocating lever (630).
6. The device for rapidly detecting the aggregate needle shape for concrete according to claim 1, is characterized in that: the flow dividing device (700) comprises a collection box (710), a flow dividing plate (720) and a separation plate (730), wherein the flow dividing plate (720) is arranged below the needle-shaped screen (400) and the sheet-shaped screen (500), the collection box (710) is installed on the flow dividing plate (720), and the separation plate (730) is positioned in the middle between the needle-shaped screen (400) and the sheet-shaped screen (500).
7. The device for rapidly detecting the aggregate needle shape for concrete according to claim 6, is characterized in that: the displacement area of the needle screen (400) and the sheet screen (500) is located between two diverter plates (720).
8. The use method of the device for rapidly detecting the shape of the aggregate needle sheet for concrete is characterized in that: the method comprises the following steps:
s1, selecting a plurality of aggregates;
s2, scooping out part of the aggregate from the selected aggregate and adding the part of the aggregate into the needle-shaped sieve (400) and the sheet-shaped sieve (500) respectively;
s3, starting the reciprocating mechanism (600) to drive the needle-shaped sieve (400) and the sheet-shaped sieve (500) to shake in a reciprocating manner;
s4, collecting box (710) collecting unqualified aggregate falling from needle screen (400) and sheet screen (500);
s5, controlling the needle sieve (400) and the sheet sieve (500) to rotate by the rotating motor (340), and pouring qualified aggregate;
s6, repeating the contents of S2-S5 until the selected aggregate is used up;
and S7, respectively bearing the weight of the unqualified needle-shaped materials and the unqualified sheet-shaped materials, and calculating the ratio.
9. The use method of the aggregate needle sheet-shaped device for rapidly detecting concrete according to claim 8 is characterized in that: and one part of the selected aggregates with a plurality of quantities is used for detecting flaky unqualified materials, and the other part of the selected aggregates with a plurality of quantities is used for detecting needle-shaped unqualified materials.
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| CN202111415520.5A CN114101044A (en) | 2021-11-25 | 2021-11-25 | Device for rapidly detecting aggregate needle sheet shape for concrete and use method |
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| CN202111415520.5A CN114101044A (en) | 2021-11-25 | 2021-11-25 | Device for rapidly detecting aggregate needle sheet shape for concrete and use method |
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