CN110090930B - Can improve sand hopper for core shooting machine of velocity of flow - Google Patents
Can improve sand hopper for core shooting machine of velocity of flow Download PDFInfo
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- CN110090930B CN110090930B CN201910487400.2A CN201910487400A CN110090930B CN 110090930 B CN110090930 B CN 110090930B CN 201910487400 A CN201910487400 A CN 201910487400A CN 110090930 B CN110090930 B CN 110090930B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
- B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C19/00—Components or accessories for moulding machines
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Abstract
The invention discloses a sand hopper for a core shooting machine, which can improve the flow velocity, and further comprises a sand shooting plate mechanism, a sand hopper mechanism, a sand inlet groove, a pressure increasing valve, a spoiler and an air inlet hole, wherein the top of the sand hopper mechanism is provided with the sand inlet groove, and one side of the top of the sand hopper mechanism is communicated with the pressure increasing valve through the arranged air inlet hole; according to the invention, the external core-covering sand is injected into the sand hopper mechanism through the feeding groove, then the high-pressure gas is injected into the sand hopper mechanism through the external gas supply mechanism by the pressure increasing valve, when the core-covering sand enters between the two side straight plates, the high-pressure gas is mixed with the core-covering sand, and the kinetic energy of the core-covering sand is improved through the flowing of the gas flow, so that the core-covering sand is discharged through the bottom after the flow rate of the core-covering sand is improved.
Description
Technical Field
The invention relates to the field of core shooters, in particular to a sand hopper for a core shooter, which can improve the flow velocity.
Background
The injection and compression molding machine is a molding machine that uses compressed air to uniformly inject molding sand into a flask for pre-compacting, and then applies pressure to compact the molding sand. The common injection molding machine has a vertical parting flaskless injection molding machine and a horizontal parting flaskless injection molding machine. The vertical parting flaskless shooting and pressing molding machine does not need a sand box for molding, molding sand is directly shot into a molding chamber with a template, the manufactured sand mould has high dimensional precision, cavities are arranged on two sides of the sand box, the production efficiency is high, the core setting is difficult, and the requirement on the quality of the molding sand is strict. The horizontal parting and stripping injection molding machine utilizes the sand box to mold, and the sand box is closed and stripped after being manufactured, so that the core setting is convenient, and the production efficiency is high.
Firstly, the existing sand hopper can only move by depending on the gravity of the core covering sand, the moving speed is slow, and the normal work of the core shooter is influenced; secondly, the sand shooting plate of the existing sand hopper is often a single plate-shaped structure, which can not be used in cooperation with other sand shooting plates, can not increase the stroke of the core-coated sand, and can not prevent the core-coated sand from leaking.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the problem that the movement speed of core-coated sand in a sand hopper is low in the prior art, and provides the sand hopper for the core shooting machine, which can improve the flow speed.
(II) technical scheme
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a sand hopper for a core shooting machine capable of improving the flow speed further comprises a sand shooting plate mechanism, a sand hopper mechanism, a sand inlet groove, a pressure increasing valve, a spoiler and an air inlet hole, wherein the sand inlet groove is formed in the top of the sand hopper mechanism, one side of the top of the sand hopper mechanism is communicated with the pressure increasing valve through the arranged air inlet hole, the spoiler is fixedly connected to the top wall of an inner cavity of the sand hopper mechanism and is positioned between the sand inlet groove and the air inlet hole, and the bottom of the sand hopper mechanism is communicated with the sand shooting plate mechanism;
the sand hopper mechanism is formed by seamlessly welding and assembling a top plate, an upper inclined plate, a side straight plate, a side inclined plate, a lower inclined plate, a front straight plate and a bottom inclined plate, wherein the side straight plate is welded in the width direction of the outer side of the bottom of the top plate, the front straight plate is welded on one side in the length direction, the upper inclined plate is welded on the other side, the lower inclined plate is welded at the bottom end of the front straight plate, two side edges of the lower inclined plate are welded with the side straight plate through the side inclined plate, the bottoms of the two side inclined plates are welded with the side straight plate and the upper inclined plate through the bottom inclined plate, the sand hopper mechanism is integrally made of a 45# steel plate and can bear the pressure of 16MPa, and an inner cavity is;
penetrate sand plate mechanism by quick air discharge duct, silica gel strip, extension sand shooting plate, stroke sand shooting plate, connect the seamless formula welding equipment of sand shooting plate and form, the one side welding of connecting the sand shooting plate has stroke sand shooting plate, and the opposite side welding of stroke sand shooting plate has extension sand shooting plate, the inside of extension sand shooting plate has evenly seted up the quick air discharge duct of a plurality of, and the inner chamber that the sand shooting plate was penetrated in the extension inlays and is equipped with the silica gel strip to the thread groove that uses with quick air discharge duct cooperation is seted up to the inside of stroke sand shooting plate.
As a further description of the above technical solution:
the inclined angle between roof and the last swash plate is the obtuse angle, the inclined angle is the obtuse angle between lower swash plate and the preceding straight board, the contained angle between end swash plate and the horizontal plane is the acute angle.
As a further description of the above technical solution:
the included angle between the top plate and the upper inclined plate is 123 degrees, the included angle between the lower inclined plate and the front straight plate is 128 degrees, and the included angle between the bottom inclined plate and the horizontal plane is 16 degrees.
As a further description of the above technical solution:
the top end of the pressure increasing valve is communicated with an external air supply mechanism, and the pressure increasing valve is fixedly connected with the upper inclined plate through a gasket bolt.
As a further description of the above technical solution:
the height of the spoiler is smaller than the distance between the circle center of the air inlet and the top plate.
(III) advantageous effects
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the external core-covering sand is injected into the sand hopper mechanism through the feeding groove, then the high-pressure gas is injected into the sand hopper mechanism through the external gas supply mechanism by the pressure increasing valve, when the core-covering sand enters between the two side straight plates, the high-pressure gas is mixed with the core-covering sand, and the kinetic energy of the core-covering sand is improved through the flowing of the gas flow, so that the core-covering sand is discharged through the bottom after the flow rate of the core-covering sand is improved.
2. In the invention, when the gas in the booster valve enters the sand hopper mechanism, the direction of the gas flow can be changed through the spoiler, so that the high-pressure gas flow is prevented from passing through the air inlet groove, the situation that the core-coated sand is ejected out of the air inlet groove by the high-pressure gas flow can be avoided, the high-pressure gas flow can enter the bottom of the sand hopper mechanism under the action of the spoiler, and the core-coated sand can be accelerated by fully utilizing the flow direction and the flow speed of the high-pressure gas flow.
3. In the sand hopper, when the core-coated sand is driven to move by high-pressure gas of the pressure increasing valve, because the included angle between the lower inclined plate and the front straight plate is an obtuse angle, the core-coated sand collides with the lower inclined plate, and in the traditional sand hopper, the front straight plate and the lower inclined plate are mutually vertical, the core-coated sand often directly collides on the front straight plate, so that the collision between the core-coated sand and the front straight plate can be reduced through the inclined arrangement of the lower inclined plate, the kinetic energy loss of the core-coated sand in the flowing process is reduced, and the flow rate of the core-coated sand is further improved.
4. In the invention, the connecting sand shooting plate can be assembled with other types of core shooting machines because the hole positions of the connecting sand shooting plate are the universal hole pitch in the using process of the sand shooting plate mechanism, and the connecting sand shooting plate can also be directly used as the sand shooting plate independently because the connecting sand shooting plate has a certain thickness.
5. According to the invention, the lengthened sand shooting plate is assembled in a seamless welding mode while the sand shooting stroke is increased, so that sand leakage occurs in the sand shooting process, and the increase of the stroke of the core-coated sand can ensure that the injection angle of the core-coated sand is more accurate when the core-coated sand is sprayed.
6. The lengthened sand shooting plate can realize quick discharge of high-temperature gas inside the sand shooting plate mechanism by arranging the high-temperature-resistant silica gel strip and the quick exhaust groove, and the silica gel strip is matched with the high-temperature-resistant silica gel strip, so that the sand shooting plate mechanism can be used for a long time under a high-temperature environment, the service life of the device is prolonged, and the maintenance cost of the device is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of a sand hopper according to the present invention;
FIG. 2 is a schematic view of the back structure of the sand hopper of the present invention;
FIG. 3 is a schematic view of the internal structure of the sand hopper of the present invention;
FIG. 4 is a schematic view of the overall structure of the sand hopper mechanism according to the present invention;
FIG. 5 is a schematic diagram of the explosion structure of the sand shooting plate mechanism of the present invention;
FIG. 6 is a schematic view of the position structure of the spoiler in accordance with the present invention;
FIG. 7 is a schematic view of the internal angle of the sand hopper mechanism of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a sand shooting plate mechanism; 101. a rapid exhaust groove; 102. a silica gel strip; 103. lengthening a sand shooting plate; 104. a stroke sand shooting plate; 105. connecting the sand shooting plates; 2. a sand hopper mechanism; 201. a top plate; 202. an upper sloping plate; 203. a lateral straight plate; 204. a side sloping plate; 205. a lower sloping plate; 206. a front straight plate; 207. a bottom sloping plate; 3. a sand inlet groove; 4. a pressure increasing valve; 5. a spoiler; 6. and (4) air inlet holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides a technical solution: a sand hopper for a core shooting machine capable of improving the flow velocity further comprises a sand shooting plate mechanism 1, a sand hopper mechanism 2, a sand inlet groove 3, a pressure increasing valve 4, a spoiler 5 and an air inlet hole 6, wherein the sand inlet groove 3 is formed in the top of the sand hopper mechanism 2, one side of the top of the sand hopper mechanism 2 is communicated with the pressure increasing valve 4 through the arranged air inlet hole 6, the spoiler 5 is fixedly connected to the top wall of an inner cavity of the sand hopper mechanism 2, the spoiler 5 is positioned between the sand inlet groove 3 and the air inlet hole 6, and the bottom of the sand hopper mechanism 2 is communicated with the sand shooting plate mechanism 1;
the sand hopper mechanism 2 is formed by seamlessly welding and assembling a top plate 201, an upper inclined plate 202, a side straight plate 203, a side inclined plate 204, a lower inclined plate 205, a front straight plate 206 and a bottom inclined plate 207, the side straight plate 203 is welded in the width direction of the outer side of the bottom of the top plate 201, the front straight plate 206 is welded in one side of the length direction, the upper inclined plate 202 is welded in the other side of the top plate, the lower inclined plate 205 is welded at the bottom end of the front straight plate 206, two side edges of the lower inclined plate 205 are welded with the side straight plate 203 through the side inclined plate 204, the bottoms of the two side inclined plates 204 are welded with the side straight plate 203 and the upper inclined plate 202 through the bottom inclined plate 207, the sand hopper mechanism 2 is integrally made of 45# steel plates and can bear the pressure of 16MPa, and.
Through adopting above-mentioned technical scheme, can ensure not to cause major incident at the in-process middle part that uses to compare in other sand hoppers and can effectively solve the various defects of system core in-process, cooperate supercharging device and whole 202 stainless steel hose on the sand hopper can solve the sand shooting efficiency of many complicated moulds.
Specifically, as shown in fig. 5, the sand shooting plate mechanism 1 is formed by assembling a quick exhaust groove 101, a silica gel strip 102, an extended sand shooting plate 103, a stroke sand shooting plate 104, and a connection sand shooting plate 105 in a seamless welding manner, wherein the stroke sand shooting plate 104 is welded on one side of the connection sand shooting plate 105, the extended sand shooting plate 103 is welded on the other side of the stroke sand shooting plate 104, a plurality of quick exhaust grooves 101 are uniformly formed in the extended sand shooting plate 103, the silica gel strip 102 is embedded in an inner cavity of the extended sand shooting plate 103, and a thread groove used in cooperation with the quick exhaust groove 101 is formed in the stroke sand shooting plate 104.
By adopting the technical scheme, the length and the width of the middle sand outlet of the three specifications are dozens of sizes so as to achieve the purpose that the sand outlet can be randomly changed according to the size of the mold when the mold is assembled, thereby accelerating the production efficiency; the thread groove not only can realize the connection effect to the bolt, and with can cooperate quick exhaust groove 101 to exhaust, silica gel strip 102 is made by the heat resistance material, make and lengthen sand shooting plate 103 high temperature resistant in-process that uses, and quick exhaust groove 101's setting, make sand shooting plate mechanism 1 at the in-process of sandblast, its inside gas also can be discharged through quick exhaust groove 101, prevent that the inside pressure of sand hopper mechanism 2 is too big.
Specifically, as shown in fig. 1 to 4, an included angle between the top plate 201 and the upper sloping plate 202 is an obtuse angle, an included angle between the lower sloping plate 205 and the front straight plate 206 is an obtuse angle, an included angle between the bottom sloping plate 207 and the horizontal plane is an acute angle, an included angle between the top plate 201 and the upper sloping plate 202 is 123 °, an included angle between the lower sloping plate 205 and the front straight plate 206 is 128 °, and an included angle between the bottom sloping plate 207 and the horizontal plane is 16 °.
By adopting the above technical scheme, the angle in the sand hopper mechanism 1 is the optimal angle selected according to the flowing effect of the gas and the core-coated sand.
Specifically, as shown in fig. 1, the top end of the pressure increasing valve 4 communicates with an external air supply mechanism, and the pressure increasing valve 4 is fixedly connected to the upper swash plate 202 by a gasket bolt.
Through adopting above-mentioned technical scheme, booster valve 4 carries out the function through outside air feed mechanism, the normal operating of guarantee device.
Specifically, as shown in fig. 3, the height of the spoiler 5 is smaller than the distance between the center of the air inlet hole 6 and the top plate 201.
Through adopting above-mentioned technical scheme for the air current can converge with the core sand fast, and reduce the area that blocks of spoiler 5 to gas.
One specific application of this embodiment is:
when the core sand injection device is used, external core-coated sand is injected into the sand hopper mechanism 2 through the feeding chute 3, then the pressure increasing valve 4 injects high-pressure gas into the sand hopper mechanism 2 through the external gas supply mechanism, when the core-coated sand enters between the two side straight plates 203, the high-pressure gas is mixed with the core-coated sand, and the kinetic energy of the core-coated sand is improved through the flowing of gas flow, so that the core-coated sand is discharged through the bottom after the flow velocity of the core-coated sand is improved, compared with the traditional mode of flowing by depending on the self gravity of the core-coated sand, the movement speed of the pressurized core-coated sand is higher, and the condition that the core shooting machine works because the core-coated sand moves too slowly can be avoided; when the gas in the booster valve 4 enters the sand hopper mechanism 2, the direction of the gas flow can be changed through the spoiler 5, so that the high-pressure gas flow is prevented from passing through the gas inlet groove 3, the phenomenon that the core-coated sand is ejected out of the gas inlet groove 3 by the high-pressure gas flow can be avoided, the high-pressure gas flow can enter the bottom of the sand hopper mechanism 2 under the action of the spoiler 5, and the core-coated sand can be accelerated by fully utilizing the flow direction and the flow speed of the high-pressure gas flow; when the core-coated sand is driven to move by the high-pressure gas of the pressure increasing valve 4, because the included angle between the lower inclined plate 205 and the front straight plate 206 is an obtuse angle, the core-coated sand collides with the lower inclined plate 205, and in the conventional sand hopper, the front straight plate 206 and the lower inclined plate 205 are perpendicular to each other, so the core-coated sand often directly collides with the front straight plate 206, and therefore, through the inclined arrangement of the lower inclined plate 205, the collision between the core-coated sand and the front straight plate 206 can be reduced, the kinetic energy loss of the core-coated sand in the flowing process can be reduced, and the flow rate of the core-coated sand can be further improved; in the using process of the sand shooting plate mechanism 1, the connecting sand shooting plate 105 can be assembled with other types of core shooting machines because the hole positions of the connecting sand shooting plate 105 are the universal hole pitch, and the connecting sand shooting plate 105 can also be directly used as a sand shooting plate independently because the connecting sand shooting plate 105 has a certain thickness; the lengthened sand shooting plate 103 is assembled in a seamless welding mode while increasing the sand shooting stroke, so that sand leakage occurs in the sand shooting process, and the increase of the stroke of the core-coated sand can ensure that the injection angle of the core-coated sand is more accurate when the core-coated sand is sprayed; lengthening sand shooting plate 103 is through setting up high temperature resistant silica gel strip 102 and quick exhaust duct 101, and quick exhaust duct 101 can realize penetrating the inside high-temperature gas of sand plate mechanism and discharge fast, and cooperates high temperature resistant silica gel strip 102 for penetrate sand plate mechanism 1 under high temperature environment, also can long-time use, improved the life of device, reduced the maintenance cost of device.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. The utility model provides a can improve sand hopper for core shooting machine of velocity of flow which characterized in that: the sand shooting device is characterized by further comprising a sand shooting plate mechanism (1), a sand hopper mechanism (2), a sand inlet groove (3), a pressure increasing valve (4), a spoiler (5) and air inlet holes (6), wherein the sand inlet groove (3) is formed in the top of the sand hopper mechanism (2), one side of the top of the sand hopper mechanism (2) is communicated with the pressure increasing valve (4) through the arranged air inlet holes (6), the spoiler (5) is fixedly connected to the top wall of an inner cavity of the sand hopper mechanism (2), the spoiler (5) is located between the sand inlet groove (3) and the air inlet holes (6), and the bottom of the sand hopper mechanism (2) is communicated with the sand shooting plate mechanism (1);
the sand hopper mechanism (2) is formed by seamless welding and assembling of a top plate (201), an upper inclined plate (202), a side straight plate (203), a side inclined plate (204), a lower inclined plate (205), a front straight plate (206) and a bottom inclined plate (207), a side straight plate (203) is welded in the width direction of the outer side of the bottom of the top plate (201), a front straight plate (206) is welded in one side of the length direction, an upper inclined plate (202) is welded in the other side of the bottom of the front straight plate (206), a lower inclined plate (205) is welded in the bottom end of the front straight plate (206), two side edges of the lower inclined plate (205) are welded with the side straight plate (203) through side inclined plates (204), the bottoms of the two side inclined plates (204) are welded with the side straight plate (203) and the upper inclined plate (202) through bottom inclined plates (207), the sand hopper mechanism (2) is integrally made of 45# steel plates, the pressure of 16MPa can be borne, and the inner cavity is formed by welding two surfaces or is subjected to double test of air pressure and oil pressure;
penetrate sand plate mechanism (1) and penetrate sand plate (103), stroke and penetrate sand plate (104), connect and penetrate sand plate (105) seamless welding equipment by quick exhaust duct (101), silica gel strip (102), extension and form, the one side welding of connecting and penetrating sand plate (105) has stroke and penetrates sand plate (104), and the opposite side welding of stroke and penetrates sand plate (104) has and adds extension and penetrates sand plate (103), the inside of lengthening and penetrates sand plate (103) evenly has seted up a plurality of quick exhaust duct (101), and has lengthened the inner chamber of penetrating sand plate (103) and inlay and be equipped with silica gel strip (102) to the thread groove that uses with quick exhaust duct (101) cooperation is seted up to the inside of stroke and penetrates sand plate (104).
2. The sand hopper for the core shooting machine capable of improving the flow speed according to claim 1, characterized in that: the included angle is the obtuse angle between roof (201) and last swash plate (202), the included angle is the obtuse angle between lower swash plate (205) and preceding straight board (206), the contained angle between end swash plate (207) and the horizontal plane is the acute angle.
3. The sand hopper for the core shooter capable of improving the flow speed according to claim 2, is characterized in that: the included angle between the top plate (201) and the upper inclined plate (202) is 123 degrees, the included angle between the lower inclined plate (205) and the front straight plate (206) is 128 degrees, and the included angle between the bottom inclined plate (207) and the horizontal plane is 16 degrees.
4. The sand hopper for the core shooting machine capable of improving the flow speed according to claim 1, characterized in that: the top end of the pressure increasing valve (4) is communicated with an external air supply mechanism, and the pressure increasing valve (4) is fixedly connected with the upper inclined plate (202) through a gasket bolt.
5. The sand hopper for the core shooting machine capable of improving the flow speed according to claim 1, characterized in that: the height of the spoiler (5) is smaller than the distance between the circle center of the air inlet (6) and the top plate (201).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910487400.2A CN110090930B (en) | 2019-06-05 | 2019-06-05 | Can improve sand hopper for core shooting machine of velocity of flow |
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| CN201910487400.2A CN110090930B (en) | 2019-06-05 | 2019-06-05 | Can improve sand hopper for core shooting machine of velocity of flow |
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| CN110090930B true CN110090930B (en) | 2020-10-30 |
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| DE3021644A1 (en) * | 1979-08-22 | 1981-03-26 | Sintokogio, Ltd., Nagoya, Aichi | MOLDING MACHINE |
| CN1007792B (en) * | 1985-06-20 | 1990-05-02 | 丹斯克·英达斯特里·辛迪卡特A/S | Method of producing parts of mould for foundry |
| JP3459913B2 (en) * | 2001-06-12 | 2003-10-27 | メタルエンジニアリング株式会社 | Method and apparatus for filling molding sand in frameless molding apparatus |
| KR101133904B1 (en) * | 2010-01-15 | 2012-04-09 | 신토고교 가부시키가이샤 | Flaskless mold forming machine |
| CN201693135U (en) * | 2010-07-01 | 2011-01-05 | 南安市德林机械制造有限公司 | Sand shooting device for core shooter |
| CN101982255B (en) * | 2010-10-28 | 2012-03-21 | 溧阳市科华机械制造有限公司 | Sand shot hopper with air control movable sand blocking cover plate |
| CN104439108A (en) * | 2013-09-25 | 2015-03-25 | 青岛鸿森重工有限公司 | Novel sand box mechanism for modeling machine |
| CN204449229U (en) * | 2014-12-19 | 2015-07-08 | 济南万兴农用机械科技有限公司 | Core shooter is with penetrating sand device |
| CN107598101A (en) * | 2017-11-06 | 2018-01-19 | 禹州市昆仑模具有限公司 | One kind is large-scale singly to open automatic turning core shooter sand shot bucket |
| CN207494511U (en) * | 2017-11-17 | 2018-06-15 | 曹黎明 | A kind of sluice gate structure for being convenient for changing sand ejection board |
| CN207857793U (en) * | 2017-11-17 | 2018-09-14 | 曹黎明 | A kind of intake and exhaust structure for penetrating silo |
| CN107790647A (en) * | 2017-11-17 | 2018-03-13 | 曹黎明 | A kind of casting mold core manufacturing equipment |
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