Bamboo chip transfer device

Abstract

The utility model provides a bamboo sheet transfer device which comprises a machine frame, a transverse moving guide rail is installed on the machine frame, a sliding plate is installed above the transverse moving guide rail, and the sliding plate can transversely move along the transverse moving guide rail. A material temporary storage bin capable of turning over up and down is arranged above the sliding plate, and a discharging opening is formed in the top of the material temporary storage bin. The material temporary storage bin is provided with a first stopping position used for loading and a second stopping position used for overturning and unloading in the sliding process. Only one material temporary storage bin is used, the sliding plate drives the material temporary storage bin to reciprocate between the first stop position used for loading and the second stop position used for overturning and unloading, batch-by-batch bamboo chips are transferred to the designated position, and the bamboo chips are unloaded by overturning the material temporary storage bin. And the material blocking problem is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of bamboo product production equipment, especially relates to a bamboo sheet transfer device. BACKGROUND

[0002] At present, in the production process of bamboo products, a transfer device (such as a conveyor belt) is needed to transport the bamboo sheets to be sorted to a sorting machine for sorting to realize single-piece output for subsequent processing.

[0003] The feeding device of the bamboo sheet sorting machine with the authorization announcement number CN221581215U includes a blanking collection bin at a loading position and a feeding temporary storage bin at a turnover unloading position, the blanking collection bin and the feeding temporary storage bin are arranged in communication with each other, a pushing plate capable of pushing the material in the blanking collection bin into the feeding temporary storage bin is further arranged in the blanking collection bin, the top end of the feeding temporary storage bin is open and can be turned up and down; the bamboo sheets in the blanking collection bin are pushed into the feeding temporary storage bin by the pushing plate, and then the bamboo sheets in the feeding temporary storage bin are dropped to the feeding position of the bamboo sheet sorting machine by turning over the feeding temporary storage bin to make the top end open downward, thereby completing the feeding of the bamboo sheet sorting machine. However, since the bamboo sheets themselves have the characteristic of being not straight, the bamboo sheets are easy to be clamped in the gap between the pushing plate and the bottom of the blanking collection bin or the gap between the blanking collection bin and the feeding temporary storage bin during pushing, thereby causing a shutdown failure. SUMMARY

[0004] The utility model aims at providing a bamboo sheet transfer device which can effectively avoid the jamming shutdown problem of the prior art.

[0005] The technical scheme for realizing the utility model is as follows: a bamboo sheet transfer device, comprising a rack, a transverse guide rail is installed on the rack, a sliding plate is installed above the transverse guide rail, the sliding plate can move transversely along the transverse guide rail; a material temporary storage bin capable of being turned up and down is arranged above the sliding plate, a discharge port is arranged at the top of the material temporary storage bin; the material temporary storage bin has a first stop position for loading and a second stop position for turnover unloading during sliding.

[0006] The utility model uses only one material temporary storage bin, and the material temporary storage bin is moved back and forth between the first stop position for loading and the second stop position for turnover unloading by the sliding plate, thereby realizing the transfer of batches of bamboo sheets to the designated position, and the turnover of the material temporary storage bin realizes the unloading of the bamboo sheets, and the problem of jamming does not occur.

[0007] Further, the sliding plate is further provided with a material pressing assembly, which is located at the side of the material temporary storage bin; the material pressing assembly comprises a material pressing piece and a material pressing piece moving transmission mechanism for driving the material pressing piece to move reciprocatingly, the material pressing piece is driven by the material pressing piece moving transmission mechanism to move to the discharge opening of the material temporary storage bin to press the material. Since some bamboo chips may have a middle part or an end part raised, which may cause the bamboo chips to fall off easily and affect the loading amount, the material pressing piece moves to the discharge opening of the material temporary storage bin to press the material, which can avoid the bamboo chips from falling off accidentally and can improve the loading amount; and the material pressing assembly moves transversely with the sliding plate, when the material temporary storage bin reaches the second stop station, the material pressing piece is driven by the material pressing piece moving transmission mechanism to return to the original position, so that the bamboo chips can be released and the material temporary storage bin can be turned over to discharge the material. Further, the material pressing piece is in an arc shape protruding upward, so that the material pressing piece can hold the bamboo chips tightly with the material temporary storage bin when the material pressing piece moves to the discharge opening of the material temporary storage bin. The material pressing piece moving transmission mechanism comprises a mounting seat and a first swing shaft rotatably mounted on the mounting seat, the first swing shaft, the transverse moving guide rail and the material temporary storage bin are arranged in parallel with each other, the material pressing piece is arranged perpendicularly to the first swing shaft, and any end part of the material pressing piece is fixedly connected with the first swing shaft; the material pressing assembly further comprises a first cylinder and a first connecting rod, the first swing shaft is driven by the first cylinder to swing through the first connecting rod, so that the material pressing piece swings up and down, thereby realizing the reciprocating movement of the material pressing piece. During work, the bamboo chips are placed in the material temporary storage bin along the length direction of the material temporary storage bin; when the first swing shaft drives the material pressing piece to swing downward, the material pressing piece can press against the bamboo chips in the material temporary storage bin; when the swing shaft drives the material pressing piece to swing upward, the bamboo chips can be released, and at this time, the material temporary storage bin can be turned over to discharge the material. The material pressing piece is preferably a plurality of pieces, which are arranged at intervals along the length direction of the material temporary storage bin, so that the material pressing effect is better. In the specific implementation process, the first cylinder is hinged to the fixed vertical plate at the bottom of the sliding plate.

[0008] Further, the material temporary storage bin is composed of a plurality of sub-bins arranged at intervals along the length direction of the material temporary storage bin, the sub-bins are arranged in communication with each other, and the material pressing piece is arranged between two adjacent sub-bins. During work, each bamboo chip spans all the sub-bins, and the material pressing piece can press the bamboo chip at the middle part of the bamboo chip (i.e. “material pressing”) between two sub-bins, and the position of the material pressing piece is reasonable.

[0009] Further, the sliding plate is also provided with a turnover assembly, which is located at two sides of the material temporary storage bin and is separate from the material pressing assembly, and the turnover assembly comprises an axle seat, a second swing axle installed on the axle seat, and a turnover transmission mechanism for driving the second swing axle to rotate; the second swing axle is parallel to the transverse moving guide rail; the second swing axle is fixedly connected with the outer wall of the material temporary storage bin, and the material temporary storage bin is swung around the second swing axle as the center axis through the rotation of the second swing axle, so as to realize the up-down turnover of the material temporary storage bin. Further, the turnover transmission mechanism is located at any end of the material temporary storage bin, and the turnover transmission mechanism comprises a gear fixedly sleeved on the second swing axle and a rack engaged with the gear; a first longitudinal moving guide rail is installed on the upper surface of the sliding plate, a sliding block is slidingly and fitly installed on the first longitudinal moving guide rail, and the rack is fixedly installed on the sliding block; the turnover assembly further comprises a second cylinder and a second connecting rod, and the sliding block is driven by the second cylinder to move longitudinally along the first longitudinal moving guide rail through the second connecting rod, so as to drive the rack to move longitudinally, realize the rotation of the second swing axle and the swinging (up-down turnover) of the material temporary storage bin.

[0010] Further, a bamboo chip lifting and feeding device is arranged at the first stop position and located at the side of the material temporary storage bin; the bamboo chip lifting and feeding device comprises two side plates oppositely arranged in the transverse direction and a lifting and conveying mechanism installed between the two side plates, and the top material discharge side of each side plate is provided with a bamboo chip material discharge guide slope; the material temporary storage bin is located at the guide end of the two bamboo chip material discharge guide slopes and used for receiving the material sliding down from the two bamboo chip material discharge guide slopes. At this time, the material temporary storage bin is mechanically and automatically fed by the bamboo chip lifting and feeding device. Further, a feeding distance adjusting device is installed on the side of the material temporary storage bin of the bamboo chip lifting and feeding device, and the feeding distance adjusting device comprises two second longitudinal moving guide rails respectively installed on the racks on the two sides of the bamboo chip lifting and feeding device, a cross beam slidingly and fitly installed between the two second longitudinal moving guide rails and capable of moving longitudinally along the second longitudinal moving guide rails, and a longitudinal moving driving mechanism for driving the cross beam to move longitudinally; the two side plates of the bamboo chip lifting and feeding device are each provided with a cross beam mounting hole; the cross beam is sequentially arranged through the two cross beam mounting holes, and the bamboo chip lifting and feeding device is driven by the cross beam to move longitudinally, so as to adjust the distance between the guide end of the bamboo chip material discharge guide slope and the material temporary storage bin as required, which not only ensures that the material temporary storage bin can receive all the material discharged by the bamboo chip lifting and feeding device, but also realizes the uniform discharge of the bamboo chips. Preferably, the cross beam has a plurality of cross beams arranged in an up-down interval; the cross beams are fixedly connected through connecting rods, and the longitudinal moving driving mechanism is a longitudinal moving cylinder, and the free end of the piston rod of the longitudinal moving cylinder is connected with the middle part of the connecting rod, which is conducive to improving the structural stability. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the bamboo strip transfer device of this utility model from a first angle;

[0012] Figure 2 yes Figure 1 Enlarged view of section A;

[0013] Figure 3 This is a three-dimensional structural diagram of the bamboo strip transfer device of this utility model from a second angle;

[0014] Figure 4 yes Figure 3 Enlarged view of section B. Detailed Implementation

[0015] The specific implementation method of the bamboo strip transfer device of this utility model will be described in detail below with reference to the accompanying drawings:

[0016] like Figure 1 As shown, a bamboo strip transfer device includes a frame 10, on which a transverse guide rail 20 is mounted. A sliding plate 30 is mounted above the transverse guide rail 20, and the sliding plate 30 can move laterally along the transverse guide rail 20. Above the sliding plate 30, there is a material storage bin 40 that can be flipped up and down, and the top of the material storage bin 40 is provided with a discharge port. During the sliding process, the material storage bin 40 has a first stop position for loading and a second stop position 50 for flipping and unloading.

[0017] During operation, the material storage bin 40 is loaded with materials at the first stop position (e.g., Figure 1 , Figure 3 As shown), after the loading is completed, the sliding plate 30 drives the material storage bin 40 to move from the first stop position to the second stop position 50. At the second stop position 50, the material storage bin 40 is flipped so that its discharge port faces downward, so that the material in the material storage bin 40 is discharged to a designated position (such as the feed port of a bamboo strip sorting machine, so as to load the bamboo strip sorting machine).

[0018] This invention uses only one material storage bin 40, and the material storage bin 40 is moved back and forth between the first stop position and the second stop position 50 by the sliding plate 30, so as to transfer batches of bamboo strips to the designated position. By flipping the material storage bin 40, the bamboo strips are unloaded, and there will be no material jamming problem.

[0019] Furthermore, such as Figure 1As shown, the sliding plate 30 is further provided with a material pressing assembly 60 located at the side of the material temporary storage bin 40; the material pressing assembly 60 comprises a material pressing piece 61 and a material pressing piece moving transmission mechanism 62 for driving the material pressing piece 61 to move reciprocally, the material pressing piece 61 is driven by the material pressing piece moving transmission mechanism 62 to move to the discharge opening of the material temporary storage bin 40 to press the material. Since some bamboo chips may have a middle part or an end part raised, which causes the bamboo chips to fall off easily and affects the loading amount, the material pressing piece 61 moves to the discharge opening of the material temporary storage bin 40 to press the material, which can avoid the bamboo chips from falling off accidentally and can improve the loading amount; and the material pressing assembly 60 moves laterally with the sliding plate 30, when the material temporary storage bin 40 reaches the second stop station 50, the material pressing piece 60 is driven back by the material pressing piece moving transmission mechanism 62, and the bamboo chips are released, which does not affect the overturning and discharging of the material temporary storage bin 40. Further, as shown in Figure 1 The material pressing piece 61 is in an upwardly protruding arc shape, so that the material pressing piece 61 can hold the bamboo chips tightly with the material temporary storage bin 40 when the material pressing piece 61 moves to the discharge opening of the material temporary storage bin 40. As shown in Figure 1 The material pressing piece moving transmission mechanism 62 comprises a mounting seat 621 and a first swing shaft 622 rotatably mounted on the mounting seat 621, the first swing shaft 622, the lateral moving guide rail 20 and the material temporary storage bin 40 are arranged in parallel with each other, the material pressing piece 61 is arranged perpendicularly to the first swing shaft 622, and any end part of the material pressing piece 61 is fixedly connected with the first swing shaft 622; the material pressing assembly 60 further comprises a first cylinder 63 and a first connecting rod 64, the first swing shaft 622 is driven to swing by the first cylinder 63 through the first connecting rod 64, so as to swing the material pressing piece 61 up and down, thereby realizing the reciprocating movement of the material pressing piece 61. In work, the bamboo chips are placed in the material temporary storage bin 40 along the length direction of the material temporary storage bin 40; when the first swing shaft 622 drives the material pressing piece 61 to swing downward, the material pressing piece 61 can press against the bamboo chips in the material temporary storage bin 40; when the swing shaft 622 drives the material pressing piece 61 to swing upward, the bamboo chips are released, at this time, the material temporary storage bin 40 can be overturned to discharge the material. Of course, the material pressing piece 61 can also switch between pressing and releasing the material through the lifting mode. The material pressing piece 61 is preferably two and is arranged in the length direction of the material temporary storage bin 40 at intervals, which can better press the material. In the specific implementation process, the first cylinder 63 is hinged to the fixed vertical plate at the bottom of the sliding plate 30. Of course, the bamboo chip transfer device of the present application can also not be provided with the material pressing assembly 60.

[0020] Further, as shown in Figure 1As shown, the material temporary storage bin 40 is composed of several sub-bins which are arranged along the length direction of the material temporary storage bin 40 and are communicated with each other, and the pressing member 61 is arranged between two adjacent sub-bins. In operation, each bamboo piece will cross all the sub-bins, and the pressing member 61 can press the bamboo piece at the middle part of the bamboo piece (i.e. "pressing material") between two sub-bins, and the position of the pressing member 61 is designed reasonably. Of course, the material temporary storage bin 40 can also be a bin which is arranged integrally, in this case, the length of the material temporary storage bin 40 should be shorter than the length of the bamboo piece, and the pressing member 61 can also press the bamboo piece at the two ends of the material temporary storage bin 40.

[0021] Further, in combination with Figure 1 and Figure 2 , the sliding plate 30 is further provided with a turnover assembly 70 which is arranged at two sides of the material temporary storage bin 40 and is separate from the pressing assembly 60, the turnover assembly 70 comprises a shaft seat 71, a second swing shaft 72 which is arranged on the shaft seat 71, and a turnover transmission mechanism 73 which is used to drive the second swing shaft 72 to rotate; the second swing shaft 72 is arranged in parallel with the transverse moving guide rail 20; the second swing shaft 72 is fixedly connected with the outer wall of the material temporary storage bin 40, and the material temporary storage bin 40 is swung around the second swing shaft 72 as the center shaft through the rotation of the second swing shaft 72, so as to realize the up-down turnover of the material temporary storage bin 40. In operation, the turnover assembly 70 moves along with the sliding of the sliding plate 30, and when the material temporary storage bin 40 reaches the second stop position 50, the second swing shaft 72 is driven to rotate through the turnover transmission mechanism 73, so as to drive the material temporary storage bin 40 to turn over up-down, thereby realizing the unloading and resetting. Further, in combination with Figures 1 to 4 , the turnover transmission mechanism 73 is arranged at either end of the material temporary storage bin 40, the turnover transmission mechanism 73 comprises a gear 731 which is fixedly arranged on the second swing shaft 72 and a rack 732 which is engaged with the gear 731, a first longitudinal moving guide rail 733 is arranged on the upper surface of the sliding plate 30, a sliding block 734 is slidingly and fitly arranged on the first longitudinal moving guide rail 733, and the rack 732 is fixedly arranged on the sliding block 734; the turnover assembly 70 further comprises a second air cylinder 74 and a second connecting rod 75, the sliding block 734 is driven to move longitudinally along the first longitudinal moving guide rail 733 by the second air cylinder 74 through the second connecting rod 75, thereby driving the rack 732 to move longitudinally, so as to drive the second swing shaft 72 to rotate and the material temporary storage bin 40 to swing (turn over up-down). Of course, the turnover transmission mechanism which is used to drive the material temporary storage bin 40 to turn over up-down can be but not limited to the turnover assembly 70 in the drawings.

[0022] Further, as shown in Figure 1 , Figure 3As shown, the first stop position is provided with a bamboo sheet lifting and feeding device 80, which is located at the side of the material temporary storage bin 40; the bamboo sheet lifting and feeding device 80 comprises two side plates 81 oppositely arranged in the transverse direction and a lifting and conveying mechanism 82 installed between the two side plates 81, and the top material discharge side of the two side plates 81 is provided with two bamboo sheet material discharge guide inclined surfaces 810; the material temporary storage bin 40 is located at the guide end of the two bamboo sheet material discharge guide inclined surfaces 810 and is used for receiving the material sliding down from the two bamboo sheet material discharge guide inclined surfaces 810. At this time, the material temporary storage bin 40 is mechanically and automatically fed by the bamboo sheet lifting and feeding device 80. Further, in combination with Figure 1 and Figure 3 , the side of the material temporary storage bin 40 is also provided with a feeding distance adjusting device 110, which comprises two second longitudinal guide rails 111 respectively installed on the rack 10 at the two sides of the bamboo sheet lifting and feeding device 80, a cross beam 112 slidingly and fitly installed between the two second longitudinal guide rails 111 and capable of moving longitudinally along the second longitudinal guide rails 111, and a longitudinal movement driving mechanism 113 for driving the cross beam 112 to move longitudinally; the two side plates 81 of the bamboo sheet lifting and feeding device 80 are both provided with cross beam mounting holes 811; the cross beam 112 is sequentially arranged through the two cross beam mounting holes 811, and the bamboo sheet lifting and feeding device 80 is driven by the cross beam 112 to move longitudinally, so as to adjust the distance between the guide end of the bamboo sheet material discharge guide inclined surface 810 and the material temporary storage bin 40 as required, which not only ensures that the material temporary storage bin 40 can receive all the material discharged by the bamboo sheet lifting and feeding device 80, but also realizes uniform material discharge of the bamboo sheet. Preferably, in combination with Figure 1 and Figure 3 , the cross beam 112 has two cross beams arranged in an upper and lower spaced manner; the two cross beams 112 are fixedly connected through a connecting rod 114; and the longitudinal movement driving mechanism 113 is a longitudinal movement air cylinder, and the free end of the piston rod of the longitudinal movement air cylinder is connected with the middle part of the connecting rod 114, which is beneficial to improve the structural stability. Of course, the bamboo sheet transfer device of the utility model can also not be provided with the feeding distance adjusting device 110.

[0023] In the specific implementation process, as shown in Figure 1 , the sliding plate 30 can realize the transverse movement of the sliding plate 30 through the cooperation of the gear and the rack 120, the gear is driven to rotate by the motor 130 and is in turn driven by the motor 130, and the motor 130 is installed on the sliding plate 10. The mounting structure of the gear and the cooperation structure between the gear and the rack 120 both adopt the common gear and rack transmission structure in the mechanical field and belong to the common knowledge in the mechanical field, so they are not shown in detail.

[0024] The quantity of the pressing material piece 61 and the cross beam 112 is not limited to two in the drawing, and the quantity can be increased or decreased according to needs. Meanwhile, the quantity of the sub-warehouses contained in the material temporary storage bin 40 is not limited to two in the drawing, and the quantity of the sub-warehouses can be adjusted according to the length of the bamboo chips, the length of each sub-warehouse and the distance between adjacent sub-warehouses.

[0025] The bamboo chip transfer device is not only suitable for feeding the bamboo chip sorting machine, but also suitable for feeding other equipment.

[0026] For the ordinary skilled person in the technical field to which the present application belongs, under the premise of not departing from the concept of the present application, a number of simple deductions or substitutions can also be made, which should be considered as belonging to the protection range of the present application.

Claims

1. A bamboo slice transfer device, comprising a rack, characterized in that: The rack is provided with a transverse guide rail, a sliding plate is arranged above the transverse guide rail and can move transversely along the transverse guide rail, a material temporary storage bin capable of being turned up and down is arranged above the sliding plate, and a discharge port is arranged at the top of the material temporary storage bin.

2. The bamboo slice transferring device according to claim 1, wherein: A material pressing assembly is further arranged on the sliding plate and is located at the side of the material temporary storage bin, the material pressing assembly comprises a material pressing piece and a material pressing piece moving transmission mechanism for driving the material pressing piece to move reciprocally, and the material pressing piece can be driven by the material pressing piece moving transmission mechanism to move to the discharge port of the material temporary storage bin to press the material.

3. The bamboo slice transferring device according to claim 2, characterized in that: The material pressing piece moving transmission mechanism comprises a mounting seat and a first swing shaft rotatably arranged on the mounting seat, the first swing shaft, the transverse guide rail and the material temporary storage bin are arranged in parallel with each other, the material pressing piece is arranged perpendicularly to the first swing shaft, and any end of the material pressing piece is fixedly connected with the first swing shaft, the material pressing assembly further comprises a first cylinder and a first connecting rod, the first swing shaft is driven by the first cylinder to swing through the first connecting rod, so that the material pressing piece swings up and down, and the reciprocating movement of the material pressing piece is realized.

4. The bamboo slice transferring device according to claim 2, characterized in that: The material pressing piece is in the shape of an upwardly protruding arc, and a plurality of material pressing pieces are arranged at intervals along the length direction of the material temporary storage bin.

5. The bamboo slice transferring device according to claim 2, characterized in that: The material temporary storage bin is composed of a plurality of sub-bins arranged at intervals along the length direction of the material temporary storage bin, the sub-bins are arranged in communication with each other, and the material pressing pieces are arranged between adjacent two sub-bins.

6. The bamboo slice transferring device according to claim 2, characterized in that: A turning assembly is further arranged on the sliding plate, the turning assembly and the material pressing assembly are located at two sides of the material temporary storage bin, the turning assembly comprises a shaft seat, a second swing shaft arranged on the shaft seat and a turning transmission mechanism for driving the second swing shaft to rotate, the second swing shaft is arranged in parallel with the transverse guide rail, the second swing shaft is fixedly connected with the outer wall of the material temporary storage bin, the material temporary storage bin is swung about the second swing shaft as the center shaft through the rotation of the second swing shaft, so that the material temporary storage bin is turned up and down.

7. The bamboo slice transferring device according to claim 6, characterized in that: The turning transmission mechanism is located at any end of the material temporary storage bin, the turning transmission mechanism comprises a gear fixedly sleeved on the second swing shaft and a rack engaged with the gear, a first longitudinal guide rail is arranged on the upper surface of the sliding plate, a sliding block is slidably and fittingly arranged on the first longitudinal guide rail, and the rack is fixedly arranged on the sliding block, the turning assembly further comprises a second cylinder and a second connecting rod, the sliding block is driven by the second cylinder to move longitudinally along the first longitudinal guide rail through the second connecting rod, so that the rack is longitudinally moved, the rotation of the second swing shaft and the swinging of the material temporary storage bin are realized.

8. The bamboo slice transferring device according to claim 1, wherein: A bamboo sheet lifting and feeding device is arranged at the first stop position and located at the side of the material temporary storage bin; the bamboo sheet lifting and feeding device comprises two side plates arranged opposite in the transverse direction and a lifting and conveying mechanism installed between the two side plates, and the top material dropping side of the two side plates is provided with two bamboo sheet material dropping guide slopes; the material temporary storage bin is located at the guide end of the two bamboo sheet material dropping guide slopes and used for receiving the material sliding down from the two bamboo sheet material dropping guide slopes.

9. The bamboo slice transferring device according to claim 8, characterized in that: The side of the material temporary storage bin, where the bamboo sheet lifting and feeding device is arranged, is further provided with a feeding distance adjusting device; the feeding distance adjusting device comprises two second longitudinal guide rails respectively installed on the rack at the two sides of the bamboo sheet lifting and feeding device, a cross beam slidingly and movably installed between the two second longitudinal guide rails and capable of moving longitudinally along the second longitudinal guide rails, and a longitudinal movement driving mechanism used for driving the cross beam to move longitudinally; the two side plates of the bamboo sheet lifting and feeding device are each provided with a cross beam mounting hole; the cross beam is sequentially arranged through the two cross beam mounting holes, and the bamboo sheet lifting and feeding device is driven by the cross beam to move longitudinally.

10. The bamboo slice transferring device according to claim 9, characterized in that: The cross beam has a plurality of beams arranged in an upper and lower interval; the beams are fixedly connected through connecting rods, and the longitudinal movement driving mechanism is a longitudinal movement air cylinder, and the free end of the piston rod of the longitudinal movement air cylinder is connected with the middle part of the connecting rod.

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