CN114322700A - High accuracy axial displacement external screw thread detection mechanism for drive screw - Google Patents
High accuracy axial displacement external screw thread detection mechanism for drive screw Download PDFInfo
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- CN114322700A CN114322700A CN202111669667.7A CN202111669667A CN114322700A CN 114322700 A CN114322700 A CN 114322700A CN 202111669667 A CN202111669667 A CN 202111669667A CN 114322700 A CN114322700 A CN 114322700A
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- 238000010438 heat treatment Methods 0.000 claims abstract description 4
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Abstract
The invention discloses an external thread detection mechanism for a high-precision axial displacement transmission screw, which comprises a frame, a first rotary disc which is transversely arranged is arranged on the heat treatment rack, a first dividing disc which is used for driving the first rotary disc to rotate is arranged at the lower end of the first rotary disc, the first rotating disc is provided with a plurality of thread detection ring gauges which are arranged around the center of the first rotating disc and have different diameters, a second turntable is transversely arranged beside the first turntable, a second turntable used for driving the second turntable to rotate is arranged at the lower end of the second turntable, the screw thread detection ring gauge can automatically detect screw threads, the detection process is carried out automatically, the detection is more efficient and convenient, and the screw thread detection ring gauges with various specifications can be arranged to be used for detecting various screws and screws.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of screw production, in particular to the technical field of an external thread detection mechanism for a high-precision axial displacement transmission screw.
[ background of the invention ]
Screw (Pinyin: lu Lou g { { hacek over (a) } n, English: screen): the outer surface is cut with a cylinder with a spiral groove or a cone with a conical spiral groove. The screw rods have different heads, and the heads are outer hexagonal screw rods. Still others, such as large flat screws, socket head cap screws, and the like. The screw rod mainly carries out work through setting up the external screw thread on its surface, and the performance of screw rod is directly influenced to the quality of screw thread, and present screw rod screw in ring gauge detects through the manual work more, and detection efficiency is low, detects the precision poor, is not suitable for big batch detection.
[ summary of the invention ]
The invention aims to solve the problems in the prior art, and provides a high-precision external thread detection mechanism for an axial displacement transmission screw, which can automatically detect the screw thread, improve the detection quality and improve the detection efficiency.
In order to achieve the purpose, the invention provides an external thread detection mechanism for a high-precision axial displacement transmission screw rod, which comprises a rack, wherein a first rotary disc is transversely arranged on the heat treatment rack, a first dividing disc for driving the first rotary disc to rotate is arranged at the lower end of the first rotary disc, a plurality of thread detection ring gauges which are arranged around the center of the first rotary disc and have different diameters are arranged on the first rotary disc, a second rotary disc is transversely arranged beside the first dividing disc, the horizontal height of the second rotary disc is higher than that of the first rotary disc, a second dividing disc for driving the second rotary disc to rotate is arranged at the lower end of the second rotary disc, the second rotary disc is overlapped with the first rotary disc, a detection area is arranged at the overlapped part, the thread detection ring gauges can pass through the detection area in the rotation process of the first rotary disc, and the thread detection ring gauges can pass through the detection area in the rotation process of the second rotary disc, The feeding mechanism can pass through the detection area and can be matched with a thread detection ring gauge positioned in the detection area, a plurality of feeding mechanisms arranged around the center of the second turntable are arranged on the second turntable, a vibrating disk feeding machine for conveying screws is arranged beside the machine frame, the output end of the vibrating disk feeding machine is provided with a feeding conveying rail which is arranged towards the second rotary disk, the output end of the feeding conveying rail is arranged at the lower side of the second rotary disk and can be connected with a feeding mechanism on the second rotary disk, the feeding mechanism comprises a lifting driving cylinder vertically arranged on the second turntable downwards, a cylinder arm of the lifting driving cylinder is arranged at the lower side of the second turntable, a rotating motor is arranged at the tail end of the cylinder arm of the lifting driving cylinder, the rotary motor lower extreme is equipped with vertical clamp jaw jar that sets up down and be used for pressing from both sides the clamp screw, the rotary motor can drive the clamp jaw jar is rotatory.
Preferably, the central position of each clamping jaw on the clamping jaw cylinder is vertically downwards provided with a positioning inserted rod, and the positioning inserted rod is detachably connected with the clamping jaw cylinder.
Preferably, the thread detection ring gauge comprises a first detection gauge body and a second detection gauge body capable of being matched with the first detection gauge body, a first detection semi-ring thread is vertically arranged on one side, facing the second detection gauge body, of the first detection gauge body, a second detection semi-ring thread capable of being matched with the first detection semi-ring thread is vertically arranged on one side, facing the first detection gauge body, of the second detection gauge body, the first detection semi-ring thread and the second detection semi-ring thread are spliced to form a complete detection screw hole, a plurality of transversely arranged slide bars are respectively arranged on two sides of the first detection gauge body and two sides of the second detection gauge body, the first detection gauge body and the second detection gauge body can be slidably arranged on the slide bars, and detection fixing blocks fixedly connected with the first rotary disc are respectively arranged at two ends of the slide bars, and the detection mechanism fixing block is respectively provided with a driving cylinder for driving the first detection gauge body and the second detection gauge body to slide along the slide rod in a reciprocating manner.
Preferably, the first rotary disc is provided with rotary disc blanking holes which penetrate through the upper side and the lower side of the first rotary disc at positions close to the first detection semi-ring threads and the second detection semi-ring threads.
As preferred, the frame on be close to detection zone department be equipped with can with be located detection zone department carousel blanking hole complex yields connect the hopper, the yields connect the hopper output to run through the frame extends to the frame side, the yields connect the other substandard product that is equipped with of hopper to connect the hopper, the substandard product connects the hopper output to run through the frame extends to the frame side.
Preferably, the upper ends of the first detection semi-ring thread and the second detection semi-ring thread are respectively provided with a semi-conical surface with the diameter gradually increasing from bottom to top, and the semi-conical surfaces on the two sides can be combined to form a conical hole with the diameter gradually increasing from bottom to top.
Preferably, a torque meter is provided between the rotating shaft of the rotating electric machine and the jaw cylinder.
The external thread detection mechanism for the high-precision axial displacement transmission screw has the beneficial effects that: the screw thread detection device can automatically detect screw threads, the detection process is carried out automatically, the detection is more efficient and convenient, the thread detection ring gauges with various specifications can be arranged to detect various screw threads of different screws, the second rotary table is provided with a plurality of feeding mechanisms to carry out uninterrupted feeding and detection, the feeding and the detection are more convenient and efficient, and the time for waiting for feeding is saved.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a schematic top view of an external thread inspection mechanism for a high precision axial displacement drive screw according to the present invention.
FIG. 2 is a schematic structural diagram of a high-precision external thread detection mechanism for an axial displacement drive screw according to the present invention.
FIG. 3 is a schematic top view of the first rotary table of the external thread detection mechanism for a high-precision axial displacement drive screw according to the present invention.
FIG. 4 is a schematic view of the lower view of the second rotary table of the external thread detection mechanism for a high-precision axial displacement drive screw according to the present invention.
FIG. 5 is a schematic view of the lower structure of the feeding mechanism of the external thread detection mechanism for the high-precision axial displacement transmission screw according to the present invention.
FIG. 6 is a schematic sectional view of the thread detecting ring gauge and the first rotary table of the external thread detecting mechanism for the high-precision axial displacement driving screw according to the present invention.
FIG. 7 is a schematic structural diagram of a feeding mechanism of the external thread detection mechanism for the high-precision axial displacement drive screw according to the present invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
In the description of the present invention, it should be noted that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships in which the products of the present invention are conventionally placed when used, and are merely used for convenience of describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
The first embodiment is as follows:
referring to fig. 1, 2, 3, 4, 5, 6 and 7, the external thread detection mechanism for the high-precision axial displacement transmission screw rod comprises a rack 1, wherein a first rotary table 2 transversely arranged is arranged on the heat treatment rack 1, a first dividing disc 3 for driving the first rotary table 2 to rotate is arranged at the lower end of the first rotary table 2, a plurality of thread detection ring gauges 4 which are arranged around the center of the first rotary table 2 and have different diameters are arranged on the first rotary table 2, a second rotary table 5 is transversely arranged beside the first dividing disc 3, the horizontal height of the second rotary table 5 is higher than that of the first rotary table 2, a second dividing disc 6 for driving the second rotary table 5 to rotate is arranged at the lower end of the second rotary table 5, the second rotary table 5 is partially overlapped with the first rotary table 2, the overlapped part is set as a detection area, and the first rotary table 2 is rotated, The thread detection ring gauge 4 can pass through the detection area, the feeding mechanism 7 can pass through the detection area and can be matched with the thread detection ring gauge 4 positioned in the detection area in the rotating process of the second rotary disc 5, a plurality of feeding mechanisms 7 arranged around the center of the second rotary disc 5 are arranged on the second rotary disc 5, a vibration disc feeding machine 8 for conveying screws is arranged beside the frame 1, a feeding conveying rail 81 arranged towards the second rotary disc 5 is arranged at the output end of the vibration disc feeding machine 8, the output end of the feeding conveying rail 81 is arranged at the lower side of the second rotary disc 5 and can be matched with the feeding mechanism 7 on the second rotary disc 5, the feeding mechanism 7 comprises a lifting driving cylinder 71 vertically arranged downwards on the second rotary disc 5, the cylinder arm of the lifting driving cylinder 71 is arranged at the lower side of the second rotary disc 5, and the tail end of the lifting driving cylinder 71 is provided with a rotating motor 72, the lower end of the rotating motor 72 is provided with a clamping jaw cylinder 73 which is vertically arranged downwards and used for clamping a screw, and the rotating motor 72 can drive the clamping jaw cylinder 73 to rotate. In the working process of the embodiment, a vibrating disk feeding machine 8 is used for conveying screws to be detected into a feeding conveying rail 81, the feeding conveying rail 81 is used for conveying the screws to the lower side of a second rotary disk 5, a second dividing disk 6 drives the second rotary disk 5 to rotate so that one feeding mechanism 7 rotates to the upper side of the feeding conveying rail 81, a lifting driving cylinder 71 of the feeding mechanism 7 drives a rotating motor 72 and a clamping jaw cylinder 73 to descend to the upper side of the feeding conveying rail 81, the clamping jaw cylinder 73 clamps and fixes the head of the screw at the upper side of the feeding conveying rail 81, the lifting driving cylinder 71 drives the clamping jaw cylinder 73 to ascend, the second dividing disk 6 drives the second rotary disk 5 to continuously rotate so that the clamping jaw cylinder 73 clamping the screw is rotated to a detection area, a first dividing disk 3 can drive the first rotary disk 2 to rotate a thread detection ring gauge 4 with a proper diameter to the detection area and corresponds to the clamping jaw cylinder 73, the lifting driving cylinder 71 drives the clamping jaw cylinder 73 to descend so as to insert the screw into a detection hole of the thread detection ring gauge 4, rotating electrical machines 72 drives clamping jaw jar 73 and the screw is rotatory together, it detects the inspection hole that whether screw thread detection ring gage 4 can smooth screw in, thereby judge whether the screw is qualified, detection process automation goes on, it is more efficient to detect, it is more convenient, the screw thread that sets up multiple specification detects ring gage 4 and can deal with various different screw rod and detect, through setting up a plurality of feed mechanism 7 with second carousel 5 and carry out incessant material loading and detection, the material loading, it is more convenient to detect, high efficiency, the time of waiting for the material loading is saved.
Referring to fig. 1, 2, 3, 4, 5, 6 and 7, a positioning insertion rod 74 is vertically arranged on the central position of each clamping jaw of the clamping jaw cylinder 73 downwards, and the positioning insertion rod 74 is detachably connected with the clamping jaw cylinder 73. The positioning rod 74 can be inserted into the hexagonal socket of the screw head to facilitate positioning of the screw.
Referring to fig. 1, 2, 3, 4, 5, 6 and 7, the thread detecting ring gauge 4 includes a first detecting gauge body 41 and a second detecting gauge body 42 capable of cooperating with the first detecting gauge body 41, a first detecting half-ring thread 411 is vertically disposed on one side of the first detecting gauge body 41 facing the second detecting gauge body 42, a second detecting half-ring thread 421 capable of cooperating with the first detecting half-ring thread 411 is vertically disposed on one side of the second detecting gauge body 42 facing the first detecting gauge body 41, the first detecting half-ring thread 411 and the second detecting half-ring thread 421 are capable of being assembled to form a complete detecting hole, a plurality of laterally disposed slide rods 43 are respectively disposed on two sides of the first detecting gauge body 41 and the second detecting gauge body 42, both the first detecting gauge body 41 and the second detecting gauge body 42 are slidably disposed on the slide rod 43, the two ends of the sliding rod 43 are respectively provided with a detection mechanism fixing block 44 which is fixedly connected with the first rotating disc 2, and the detection mechanism fixing block 44 is respectively provided with a driving cylinder 45 which is used for driving the first detection gauge body 41 and the second detection gauge body 42 to slide along the sliding rod 43 in a reciprocating manner. Set up the screw thread detection ring gauge 4 to be by first detection gauge body 41, the concatenation formula structure that the second detected gauge body 42 is constituteed, it is more convenient to make the screw detect and unload after accomplishing, need not the reversal after the screw detects the screw when the screw detects screw and follow the screw and screw out, only need control both sides driving cylinder 45 with first detection gauge body 41, the second detects gauge body 42 and draws back respectively to both sides and can open the detection screw, make the screw can directly take out, it is more convenient that the screw is taken out, and the efficiency is improved.
Referring to fig. 1, 2, 3, 4, 5, 6 and 7, a turntable blanking hole 21 is formed in the first turntable 2 near the first detection half-ring thread 411 and the second detection half-ring thread 421 and penetrates through the upper side and the lower side of the first turntable 2. The turntable blanking hole 21 is arranged to facilitate discharging, after detection is completed, the first detection gauge body 41 and the second detection gauge body 42 are directly separated, the clamping jaw cylinder 73 is loosened, and screws on the clamping jaw cylinder 73 can directly fall to the lower side of the first turntable 2 through the turntable blanking hole 21 to be collected.
Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7, a good product receiving hopper 9 which can be matched with a turntable blanking hole 21 located at the detection area is arranged at the position, close to the detection area, of the rack 1, the output end of the good product receiving hopper 9 penetrates through the rack 1 and extends to the side edge of the rack 1, a defective product receiving hopper 10 is arranged beside the good product receiving hopper 9, and the output end of the defective product receiving hopper 10 penetrates through the rack 1 and extends to the side edge of the rack 1. After the detection is finished, if the screws are qualified, the first detection gauge body 41 and the second detection gauge body 42 can be directly separated, and the qualified screws fall into the good product receiving hopper 9 through the turntable blanking hole 21 and are discharged; when the screw is unqualified, the clamping jaw cylinder 73 is loosened, the first turntable 2 rotates the first detection gauge body 41 and the second detection gauge body 42 to the unqualified product receiving hopper 10 to be opened, the unqualified screw can directly fall into the unqualified product receiving hopper 10, and discharging is more convenient.
Referring to fig. 1, 2, 3, 4, 5, 6 and 7, the upper ends of the first detecting half-ring thread 411 and the second detecting half-ring thread 421 are respectively provided with a semi-conical surface 4111 with a diameter gradually increasing from bottom to top, and the semi-conical surfaces 4111 on both sides can be combined to form a conical hole with a diameter gradually increasing from bottom to top. The screw is convenient to fall.
Referring to fig. 1, 2, 3, 4, 5, 6 and 7, a torque meter 75 is disposed between the rotating shaft of the rotating motor 72 and the jaw cylinder 73. Whether the screw is screwed into the thread detection ring gauge 4 smoothly is detected through the torque of the torque meter 75, so that whether the screw is qualified is judged.
The working process of the invention is as follows:
the invention relates to an external thread detection mechanism for a high-precision axial displacement transmission screw, which is characterized in that in the working process, a vibrating disc feeder 8 is used for conveying screws to be detected into a feeding conveying rail 81, the feeding conveying rail 81 is used for conveying the screws to the lower side of a second rotary disc 5, a second dividing disc 6 drives the second rotary disc 5 to rotate so that one feeding mechanism 7 rotates to the upper side of the feeding conveying rail 81, a lifting driving cylinder 71 of the feeding mechanism 7 drives a rotating motor 72 and a clamping jaw cylinder 73 to descend to the upper side of the feeding conveying rail 81, the clamping jaw cylinder 73 clamps and fixes the head of the screw on the upper side of the feeding conveying rail 81, the lifting driving cylinder 71 drives the clamping jaw cylinder 73 to lift up, the second dividing disc 6 drives the second rotary disc 5 to continuously rotate to rotate the clamping jaw cylinder 73 clamped with the screws to a detection area, a first dividing disc 3 can drive a first rotary disc 2 to rotate a thread detection ring gauge 4 with a proper diameter to the detection area and correspond to the clamping jaw cylinder 73, the descending driving cylinder 71 drives the clamping jaw cylinder 73 to descend so as to insert a screw into a detection hole of the thread detection ring gauge 4, the rotating motor 72 drives the clamping jaw cylinder 73 and the screw to rotate together, whether the screw can be smoothly screwed into the detection hole of the thread detection ring gauge 4 is detected, whether the screw is smoothly screwed into the thread detection ring gauge 4 is detected through the torque of the torque meter 75, whether the screw is qualified is judged, if the screw is qualified, the first detection gauge body 41 and the second detection gauge body 42 can be directly separated, and the qualified screw falls into the qualified product receiving hopper 9 through the turntable blanking hole 21 and is discharged; when the screw is unqualified, the clamping jaw cylinder 73 is loosened, the first rotary table 2 rotates the first detection gauge body 41 and the second detection gauge body 42 to the unqualified receiving hopper 10 to be opened, and the unqualified screw can directly fall into the unqualified receiving hopper 10.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.
Claims (7)
1. The utility model provides a high accuracy axial displacement external screw thread detection mechanism for driving screw, includes frame (1), be equipped with first carousel (2) of horizontal setting on heat treatment frame (1), first carousel (2) lower extreme is equipped with and is used for the drive first graduated disk (3) of first carousel (2) rotation, its characterized in that: the thread detection device is characterized in that a plurality of thread detection ring gauges (4) which are arranged around the center of the first rotary disc (2) and have different diameters are arranged on the first rotary disc (2), a second rotary disc (5) is transversely arranged beside the first dividing disc (3), the horizontal height of the second rotary disc (5) is higher than that of the first rotary disc (2), a second dividing disc (6) for driving the second rotary disc (5) to rotate is arranged at the lower end of the second rotary disc (5), the second rotary disc (5) is partially overlapped with the first rotary disc (2), a detection area is arranged at the overlapped part, the thread detection ring gauge (4) can pass through the detection area during the rotation process of the first rotary disc (2), the feeding mechanism (7) can pass through the detection area and can be matched with the thread detection ring gauge (4) positioned in the detection area, a plurality of feeding mechanisms (7) arranged around the center of the second rotary disc (5) are arranged on the second rotary disc (5), a vibrating disk feeding machine (8) for conveying screws is arranged beside the machine frame (1), the output end of the vibrating disk feeder (8) is provided with a feeding conveying rail (81) which is arranged towards the second rotating disk (5), the output end of the feeding conveying rail (81) is arranged at the lower side of the second rotary table (5) and can be connected with a feeding mechanism (7) on the second rotary table (5), the feeding mechanism (7) comprises a lifting driving cylinder (71) which is vertically arranged on the second turntable (5) downwards, the cylinder arm of the lifting driving cylinder (71) is arranged at the lower side of the second turntable (5), the tail end of the cylinder arm of the lifting driving cylinder (71) is provided with a rotating motor (72), the lower end of the rotating motor (72) is provided with a clamping jaw cylinder (73) which is vertically arranged downwards and used for clamping a screw, and the rotating motor (72) can drive the clamping jaw cylinder (73) to rotate.
2. An external thread sensing mechanism for a high precision axial displacement drive screw as defined in claim 1, wherein: each clamping jaw central point on the clamping jaw cylinder (73) puts and is equipped with location inserted bar (74) vertically down, location inserted bar (74) with clamping jaw cylinder (73) can be dismantled and be connected.
3. An external thread sensing mechanism for a high precision axial displacement drive screw as defined in claim 1, wherein: the thread detection ring gauge (4) comprises a first detection gauge body (41) and a second detection gauge body (42) matched with the first detection gauge body (41), wherein a first detection semi-ring thread (411) is vertically arranged on one side, facing the second detection gauge body (42), of the first detection gauge body (41), a second detection semi-ring thread (421) matched with the first detection semi-ring thread (411) is vertically arranged on one side, facing the first detection gauge body (41), of the second detection gauge body (42), the first detection semi-ring thread (411) and the second detection semi-ring thread (421) can be spliced to form a complete detection hole, a plurality of sliding rods (43) arranged transversely are respectively arranged on two sides of the first detection gauge body (41) and the second detection gauge body (42), and both the first detection gauge body (41) and the second detection gauge body (42) can be arranged on the sliding rods (43) in a sliding manner, slide bar (43) both ends be equipped with respectively be used for with first carousel (2) fixed connection's detection mechanism fixed block (44), be equipped with respectively on detection mechanism fixed block (44) and be used for the drive first detection gauge body (41), second detection gauge body (42) are followed slide bar (43) reciprocating sliding's actuating cylinder (45).
4. An external thread sensing mechanism for a high precision axial displacement drive screw as defined in claim 2, wherein: and a rotary table blanking hole (21) which penetrates through the upper side and the lower side of the first rotary table (2) is formed in the first rotary table (2) and is close to the first detection semi-ring thread (411) and the second detection semi-ring thread (421).
5. An external thread sensing mechanism for a high precision axial displacement drive screw as defined in claim 4, wherein: be close to on frame (1) detection zone department be equipped with can with be located detection zone department carousel blanking hole (21) complex yields connect hopper (9), the yields connects hopper (9) output to run through frame (1) extends to frame (1) side, the yields connects hopper (9) other to be equipped with the substandard product and connects hopper (10), the substandard product connects hopper (10) output to run through frame (1) extends to frame (1) side.
6. An external thread sensing mechanism for a high precision axial displacement drive screw as defined in claim 5, wherein: the upper ends of the first detection semi-ring thread (411) and the second detection semi-ring thread (421) are respectively provided with a semi-conical surface (4111) with the diameter gradually increasing from bottom to top, and the semi-conical surfaces (4111) on the two sides can be combined to form a taper hole with the diameter gradually increasing from bottom to top.
7. An external thread sensing mechanism for a high precision axial displacement drive screw as defined in claim 1, wherein: a torque meter (75) is arranged between the rotating shaft of the rotating motor (72) and the clamping jaw cylinder (73).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111669667.7A CN114322700B (en) | 2021-12-31 | 2021-12-31 | External thread detection mechanism for high-precision axial displacement drive screw |
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| CN202111669667.7A CN114322700B (en) | 2021-12-31 | 2021-12-31 | External thread detection mechanism for high-precision axial displacement drive screw |
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| CN114322700B CN114322700B (en) | 2024-03-26 |
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| Title |
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| 乐为: "螺纹检测方法及检测器具适用范围的比较", 《考试周刊》, no. 63, 9 August 2011 (2011-08-09) * |
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