Plate conveying machine in brick making equipment

Abstract

The utility model discloses a plate conveying machine in brick making equipment. The plate conveying machine comprises a plate conveying trolley, two middle guide rail frames, two lifting frames, a first driving mechanism and a second driving mechanism. The plate conveying trolley is provided with a plurality of push claws, and a heightening plate is arranged at the tail end of the middle guide rail frame. The length of the heightening plate is larger than or equal to the length of one station, the top face of the middle guide rail frame is lower than the top face of the plate conveying trolley, and the top face of the heightening plate is higher than the top face of the plate conveying trolley and lower than the top face of a pushing claw on the plate conveying trolley. The reciprocating motion of the plate conveying trolley is matched with the lifting motion of the lifting frame, so that each supporting plate moves forwards by one station in the process that the plate conveying trolley moves forwards and backwards by one reciprocating motion; then a pushing claw on the plate conveying trolley is matched with a heightening plate on the middle guide rail frame, so that the supporting plate can be pushed into the brick making forming machine; before the supporting plate is pushed, sliding friction does not exist between the plate feeding machine and the supporting plate, friction loss is reduced, and the service life of the plate feeding machine and the service life of the supporting plate are prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of brick-making equipment, and in particular to a plate feeding machine in brick-making equipment. Background Technology

[0002] Brick-making equipment is a type of machinery used to produce bricks. The feeding machine, located at the front of the brick-forming machine, delivers empty pallets to the brick-forming mold. The pallets cooperate with the mold to receive and form bricks. During feeding, the pallets are placed sequentially on the support bars of the frame. The feeding machine, positioned below the pallets, includes a drive cylinder and a feeding trolley. The piston rod of the drive cylinder extends, pushing the feeding trolley forward. Each lever on the feeding trolley extends upward, pushing each pallet along the support bars of the frame until the first pallet is delivered to the worktable of the forming mechanism. The feeding trolley then retracts, awaiting the next feeding. Because the bottom of the pallet constantly rubs against the support bars during feeding, this easily causes wear and tear on both the pallet and the support bars, reducing their service life. Furthermore, the different positions of each pallet on the support key bar result in varying gaps between each pusher and its corresponding pallet. During the same push process, pallets closer to the pusher are pushed first, while those farther away are pushed later, preventing the pushers from pushing their corresponding pallets synchronously. Because the gaps between each pusher and the corresponding pallet vary, the distance the pallet is pushed from the feeder to the brick forming machine varies with each forward movement of the feeding trolley, leading to different backward distances and making precise control of the trolley's backward movement impossible. Consequently, when the feeding trolley reverses for the next push, some pushers may not be positioned on the pallet's pushing side, preventing push, or pushers may collide with the pallet, causing it to shift and tilt, hindering push. This results in an unsmooth feeding process and low feeding efficiency.

[0003] In view of this, the applicant has deeply conceived and actively researched and developed this project to address the numerous deficiencies and inconveniences caused by the imperfections in the aforementioned plate feeding machine structure. Summary of the Invention

[0004] The purpose of this utility model is to provide a plate feeding machine in brick making equipment. First, the reciprocating motion of the plate feeding trolley and the lifting motion of the lifting frame are coordinated so that each pallet moves forward one station during one round trip of the plate feeding trolley. Then, the push claw on the plate feeding trolley and the lifting plate on the intermediate guide rail frame cooperate to push the pallet into the brick forming machine. Before pushing the pallet, there is no sliding friction between the plate feeding machine and the pallet, which reduces friction loss and improves the service life of the plate feeding machine and the pallet.

[0005] To achieve the above objectives, the solution of this utility model is:

[0006] A plate feeding machine in a brick-making apparatus includes a plate feeding trolley mounted on a frame, two intermediate guide rails located on either side of the plate feeding trolley, two lifting frames located on either side of the two intermediate guide rails, a first drive mechanism for driving the plate feeding trolley to move on the intermediate guide rails, and a second drive mechanism for driving the lifting frames to move up and down. The plate feeding trolley has multiple push claws evenly spaced along the plate feeding direction, with the distance between two adjacent push claws being the distance between a workstation for placing a pallet. An extension plate is provided at the end of the intermediate guide rails. The length of the extension plate is greater than or equal to the length of one workstation, and the top surface of the intermediate guide rails is lower than the top surface of the plate feeding trolley, while the top surface of the extension plate is higher than the top surface of the plate feeding trolley but lower than the top surface of the push claws on the plate feeding trolley.

[0007] After the pallet moves to the second-to-last station of the pallet delivery trolley, when the pallet delivery trolley moves forward one station in the next round, the pusher claw pushes the pallet on the second-to-last station of the pallet delivery trolley from the pallet delivery trolley to the heightening plate.

[0008] When the last station of the plate delivery trolley enters the heightening plate position, the last pusher located at the end of the plate delivery trolley pushes the pallet on the heightening plate away from the heightening plate. The last pusher extends out of the end of the heightening plate and is located at the beginning end of the second-to-last pusher of the plate delivery trolley that extends into the heightening plate.

[0009] The heightening plate is a replaceable wear-resistant plate, and the quantity is more than one.

[0010] A pressure plate frame is provided at the end of the raised plate to prevent the support plate from tilting. The pressure plate frame is provided with two extension plates extending toward the two raised plates respectively and multiple pressure plate wheels locked to the bottom of the extension plates. The distance between the pressure plate wheels and the raised plate is greater than the thickness of the support plate.

[0011] The feeding trolley has two parallel support rods, and each support rod has a plurality of corresponding push claws at equal intervals. The middle guide rail frame has a sliding groove on the side facing the support rods, and a plurality of rollers sliding on the sliding groove are provided on the outer side of the two support rods.

[0012] The first drive mechanism has a first chain gear, a second chain gear, a chain tensioned around the outer ring of the first chain gear and the second chain gear, and a drive motor that drives the first chain gear and the second chain gear to rotate in the forward or reverse direction. The straight section of the chain is arranged parallel to the plate feeding trolley, and multiple reinforcing rods are connected between the two support rods of the plate feeding trolley. A connecting block connected to the chain is provided on the reinforcing rod near the end of the plate feeding trolley.

[0013] The two lifting frames are each provided with multiple downward-extending vertical sections, and the bottom end of each vertical section is provided with a first pivot seat; the frame is provided with a second pivot seat corresponding to each first pivot seat, and the first and second pivot seats provided vertically are respectively rotatably pivotally connected to the two ends of a linkage rod; the second drive mechanism has a piston seat locked on the frame and a piston rod locked on the lifting frame; the second drive mechanism extends the piston rod to push the lifting frame to rise and lift the pallet away from the pallet feeding trolley or intermediate guide rail frame, and the second drive mechanism retracts the piston rod to pull the lifting frame to fall and place the pallet on the pallet feeding trolley or intermediate guide rail frame.

[0014] With the above structure, the feeding machine in the brick-making equipment of this utility model places the pallet on the first station at the starting end of the feeding trolley; the first drive mechanism drives the feeding trolley forward one station, moving the pallet on the first station forward one station; the second drive mechanism drives the lifting frame to rise, lifting the pallet on the first station and suspending it above the feeding trolley; the first drive mechanism drives the feeding trolley backward one station, and the second drive mechanism drives the lifting frame to descend, placing the pallet on the second station; the reciprocating motion of the feeding trolley and the lifting motion of the lifting frame are coordinated. This design allows each pallet to move forward one station during a round trip of the feeding trolley. When a pallet reaches the second-to-last station of the feeding trolley, the second-to-last pusher pushes the pallet from that station onto the extension plate during the next forward movement. Then, the last pusher pushes the pallet on the extension plate one station and moves it onto the brick forming machine, enabling continuous feeding. This invention... During the feeding process before the pusher, the feeding trolley moves, driving the pallet to move synchronously. There is no need for pushers to move the pallet, eliminating sliding friction between the feeder and the pallet, reducing frictional wear and extending the service life of both. When the feeding trolley begins pushing the pallet, although there is some friction between the pallet and the extension plate, compared to the frictional damage from the entire sliding process in existing systems, reducing the pallet's sliding distance reduces frictional damage. Furthermore, the extension plate can be replaced separately, lowering maintenance costs. Moreover, because... The pallet is placed between two adjacent pushers on the pallet feeding trolley from the beginning. When the pallet feeding trolley moves forward one station, the pallet also moves forward one station simultaneously. The distance between the pallet and the corresponding pusher is fixed and will not change as the pallet feeding trolley moves forward one station. When the pallet feeding trolley moves backward one station, the pusher is always located on the side that pushes the pallet, and the pusher will not collide with the pallet. Therefore, when the pallet feeding trolley moves backward, there is no need to consider the distance between the pusher and the pallet, which can accurately control the backward distance of the pallet feeding trolley, making the pallet feeding process smoother and the pallet feeding efficiency higher. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the brick-making equipment of this utility model, showing the connection between the plate feeder, the stepped flipper, and the brick forming machine. Figure 1 ;

[0016] Figure 2 This is a schematic diagram of the structure of the brick-making equipment of this utility model, showing the connection between the plate feeder, the stepped flipper, and the brick forming machine. Figure 2 ;

[0017] Figure 3 This is a top view of the brick-making equipment of this utility model, showing the connection between the plate feeder, the stepped flipper, and the brick forming machine.

[0018] Figure 4 This is a schematic diagram of the plate feeder in the brick-making equipment of this utility model. Figure 1 ;

[0019] Figure 5 This is a schematic diagram of the plate feeder in the brick-making equipment of this utility model. Figure 2 ;

[0020] Figure 6 This is a front view schematic diagram of the plate feeding machine in the brick-making equipment of this utility model;

[0021] Figure 7 This is a top view of the plate feeder in the brick-making equipment of this utility model;

[0022] Figure 8 This is a side view of the plate feeder in the brick-making equipment of this utility model.

[0023] Symbol Explanation

[0024] Frame 10; Pallet 20; Feeding trolley 1; Intermediate guide rail frame 2; Lifting frame 3; First drive mechanism 4; Second drive mechanism 5; Push claw 6; Heightening plate 21; Pressure plate frame 7; Extension plate 71; Pressure plate wheel 72; Support rod 11; Slide groove 22; Roller 12; First chain gear 41; Second chain gear 42; Chain 43; Drive motor 44; Reinforcing rod 111; Connecting block 112; Vertical part 31; First pivot seat 32; Second pivot seat 33; Linkage rod 34; Piston seat 51; Piston rod 52; Baffle 8; Stepped flipping machine 30; Brick forming machine 40. Detailed Implementation

[0025] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0026] Please see Figures 1 to 8This utility model discloses a plate feeding machine in a brick-making equipment. The plate feeding machine includes a plate feeding trolley 1 mounted on a frame 10, two intermediate guide rail frames 2 located on both sides of the plate feeding trolley 1, two lifting frames 3 located on both sides of the two intermediate guide rail frames 2, a first drive mechanism 4 for driving the plate feeding trolley 1 to move on the intermediate guide rail frames 2, and a second drive mechanism 5 for driving the lifting frames 3 to move up and down. The plate feeding trolley 1 is provided with a plurality of push claws 6 at equal intervals along the plate feeding direction, and the distance between two adjacent push claws 6 is the position for placing a pallet 20. An extension plate 21 is provided at the end of the intermediate guide rail frame 2. The length of the extension plate 21 is greater than or equal to the length of one position, and the top surface of the intermediate guide rail frame 2 is lower than the top surface of the plate feeding trolley 1, while the top surface of the extension plate 21 is higher than the top surface of the plate feeding trolley 1 and lower than the top surface of the push claws 6 on the plate feeding trolley 1.

[0027] The brick-making equipment of this utility model uses a plate feeding machine to place a pallet 20 on the first station at the starting end of the plate feeding trolley 1; a first drive mechanism 4 drives the plate feeding trolley 1 forward one station, moving the pallet 20 on the first station forward one station; a second drive mechanism 5 drives the lifting frame 3 to rise, lifting the pallet 20 on the first station and placing it above the plate feeding trolley 1; the first drive mechanism 4 drives the plate feeding trolley 1 backward one station, and the second drive mechanism 5 drives the lifting frame 3 to descend, placing the pallet 20 on the second station; through the coordinated reciprocating motion of the plate feeding trolley 1 and the lifting motion of the lifting frame 3, the plate feeding is achieved... During a forward and backward round trip, each pallet 20 moves forward one station. When a pallet 20 moves forward to the second-to-last station of the feeding trolley 1, the feeding trolley 1, in its next forward movement, uses the second-to-last pusher 6 to push the pallet 20 from the second-to-last station onto the extension plate 21. In the next forward movement, the feeding trolley 1 uses the last pusher 6 to push the pallet 20 on the extension plate 21 one station and move it onto the brick forming machine, enabling continuous feeding. This invention addresses the issue of pallet feeding before the pusher... During the feeding process, the feeding trolley 1 moves, driving the pallet 20 to move synchronously. The pusher 6 does not need to push the pallet 20, eliminating sliding friction between the feeder and the pallet 20, reducing frictional wear, and extending the service life of both. When the feeding trolley 1 begins pushing the pallet, although there is some friction between the pallet 20 and the extension plate 21, compared to the frictional damage during the entire pushing process, reducing the sliding distance of the pallet 20 reduces frictional damage. Furthermore, the extension plate 21 can be replaced separately, reducing maintenance costs. Moreover, because the pallet 20... From the beginning, the pusher 6 is placed between the two adjacent pushers 6 of the feeding trolley 1. When the feeding trolley 1 moves forward one station, the pallet 20 also moves forward one station simultaneously. The distance between the pallet 1 and the corresponding pusher 6 is fixed and will not change as the feeding trolley 1 moves forward one station. When the feeding trolley 1 moves backward one station, the pusher 6 is always located on the side that pushes the pallet 20, and the pusher 6 will not collide with the pallet 20. Therefore, when the feeding trolley 1 moves backward, there is no need to consider the distance between the pusher 6 and the pallet 20, which can accurately control the backward distance of the feeding trolley 1, making the feeding process smoother and the feeding efficiency higher.

[0028] The length of the extension plate 21 of this utility model is greater than or equal to the length of one workstation; when the plate feeding trolley 1 pushes the plate, the pusher 6 can completely push the pallet 20 onto the extension plate 21, avoiding the pallet 20 being placed tilted on the extension plate 21, and the pushing effect is better.

[0029] After the pallet 20 of this utility model moves to the second-to-last station of the pallet delivery trolley 1, when the pallet delivery trolley 1 advances one station in the next round, the pusher 6 pushes the pallet 20 on the second-to-last station of the pallet delivery trolley 1 from the pallet delivery trolley 1 onto the lifting plate 21.

[0030] In this invention, when the last station of the feeding trolley 1 enters the position of the heightening plate 21, the last pusher 6 located at the end of the feeding trolley 1 pushes the pallet 20 on the heightening plate 21 away from the heightening plate 21. The last pusher 6 extends out of the end of the heightening plate 21 and is located at the penultimate pusher 6 of the feeding trolley 1 extending into the beginning end of the heightening plate 21. When the feeding trolley 1 pushes the plate, the pusher 6 extending out of the end of the heightening plate 21 can completely push the pallet 20 away from the heightening plate 21 and move it to the brick forming machine, resulting in a better pushing effect.

[0031] The heightening plate 21 of this utility model is a replaceable wear-resistant plate, which can reduce friction. The heightening plate 21 can be replaced individually, resulting in low maintenance costs and avoiding the high cost of replacing the entire plate feeding machine. Furthermore, the number of heightening plates 21 is more than one, and the number of heightening plates 21 can be adjusted according to the thickness of different pallets 20 to accommodate pallets 20 of different thicknesses.

[0032] This utility model provides a pressure plate frame 7 at the end of the raised plate 21 to prevent the pallet 20 from tilting. The pressure plate frame 7 is provided with two extension plates 71 extending toward the two raised plates 21 respectively and multiple pressure plate wheels 72 locked to the bottom of the extension plates 71. The distance between the pressure plate wheels 72 and the raised plate 21 is greater than the thickness of the pallet 20. The setting of the pressure plate frame 7 allows the pallet 20 to slide horizontally on the raised plate 21, resulting in a better pallet feeding effect.

[0033] The plate feeding trolley 1 of this utility model has two parallel support rods 11, and a plurality of corresponding push claws 6 are equally spaced on the two support rods 11; the intermediate guide rail frame 2 is provided with a sliding groove 22 on the side facing the support rods 11, and a plurality of rollers 12 that slide on the sliding groove 22 are provided on the outer side of the two support rods 11; so that the first drive mechanism 4 can drive the plate feeding trolley 1 to move back and forth on the intermediate guide rail frame 2.

[0034] The first drive mechanism 4 of this utility model has a first chain gear 41 and a second chain gear 42 locked on the frame 10, a chain 43 tensioned around the outer ring of the first chain gear 41 and the second chain gear 42, and a drive motor 44 that drives the first chain gear 41 and the second chain gear 42 to rotate in the forward or reverse direction. The straight section of the chain 43 is arranged parallel to the plate feeding trolley 1, and multiple reinforcing rods 111 are connected between the two support rods 11 of the plate feeding trolley 1. A connecting block 112 connected to the chain 43 is provided on the reinforcing rod 111 near the end of the plate feeding trolley 1. When the drive motor 44 drives the first chain gear 41 and the second chain gear 42 to rotate in the forward or reverse direction, it drives the chain 43 to move forward or backward, which facilitates the forward or backward reciprocating movement of the plate feeding trolley 1 to transport the pallet 20, resulting in high plate feeding efficiency.

[0035] The two lifting frames 3 of this utility model are respectively provided with multiple downwardly extending vertical parts 31, and the bottom end of each vertical part 31 is provided with a first pivot seat 32; the frame 20 is provided with a second pivot seat 33 corresponding to each first pivot seat 32, and the first pivot seats 32 and the second pivot seats 33 provided vertically are respectively pivotally connected to the two ends of a linkage rod 34; the second drive mechanism 5 has a piston seat 51 locked on the frame 20 and a piston rod 52 locked on the lifting frame 3; the second drive mechanism 5 extends the piston rod 52 to push the lifting frame 3 to rise and lift the pallet 20 away from the plate feeding trolley 1 or the intermediate guide rail frame 2, and the second drive mechanism 5 retracts the piston rod 52 to pull the lifting frame 3 down and place the pallet 20 on the plate feeding trolley 1 or the intermediate guide rail frame 2.

[0036] The two lifting frames 3 of this utility model are provided with baffles 8 on the outside to prevent the support plate 20 from falling off.

[0037] The plate feeding method of the plate feeder in the brick-making equipment of this utility model includes the following steps:

[0038] Step S1: Place a pallet on the first station at the starting end of the pallet delivery trolley;

[0039] Step S2: The first drive mechanism drives the plate feeding trolley forward one station, which in turn moves the pallet on the first station forward one station.

[0040] Step S3: The second drive mechanism drives the lifting frame to rise and lift the pallet on the first station above the pallet delivery trolley or the heightening plate.

[0041] In step S4, the first drive mechanism drives the plate-feeding trolley to move back one station, and the second drive mechanism drives the lifting frame to descend and place the pallet on the second station.

[0042] Step S5: Repeat steps S1 to S4. During the forward and backward round trip of the pallet trolley, each pallet moves forward one workstation.

[0043] Step S6: When the block pallet moves forward to the second-to-last position of the pallet feeding trolley, when the pallet feeding trolley moves forward one position in the next round, the second-to-last pusher will push the pallet on the second-to-last position of the pallet feeding trolley from the pallet feeding trolley to the heightening plate.

[0044] Step S7: The second drive mechanism drives the lifting frame to rise and suspend the pallet on the pallet delivery trolley or the extension plate; the first drive mechanism drives the pallet delivery trolley to move back one station; and the second drive mechanism drives the lifting frame to fall and place the pallet on the pallet delivery trolley or the extension plate.

[0045] In step S8, when the first drive mechanism drives the plate feeding trolley forward one station, the last pusher claw pushes the pallet on the heightening plate one station and moves it to the brick forming machine.

[0046] Step S9: Repeat steps S5 and S8 to feed the plates sequentially.

[0047] In this invention's brick-making equipment, the feeding method involves moving each pallet forward one station during one round trip of the feeding trolley. The second-to-last pusher then pushes the pallet from the second-to-last station on the feeding trolley onto the extension plate. Finally, the last pusher pushes the pallet on the extension plate one station and moves it onto the brick-forming machine. This method enables continuous feeding of pallets with high efficiency. Before pushing the pallet, there is no sliding friction between the feeding machine and the pallet, reducing frictional wear and extending the service life of both.

[0048] The starting end of the plate feeding machine of this utility model is connected to the stepped flipping machine 30, which flips the pallets 20 one by one and places them on the first station of the plate feeding trolley 1; the ending end of the plate feeding machine is connected to the brick forming machine 40, which transports the pallets 20 into the brick forming machine 40 and cooperates with the brick forming mold to form brick blocks.

[0049] The above embodiments and accompanying drawings are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A plate feeder in a brick-making machine, characterized in that: The plate feeding machine includes a plate feeding trolley mounted on a frame, two intermediate guide rails located on either side of the plate feeding trolley, two lifting frames located on either side of the two intermediate guide rails, a first drive mechanism for driving the plate feeding trolley to move on the intermediate guide rails, and a second drive mechanism for driving the lifting frames to move up and down. The plate feeding trolley has multiple push claws evenly spaced along the plate feeding direction, with the distance between two adjacent push claws being the distance between a workstation for placing a pallet. An extension plate is provided at the end of the intermediate guide rails. The length of the extension plate is greater than or equal to the length of one workstation, and the top surface of the intermediate guide rails is lower than the top surface of the plate feeding trolley, while the top surface of the extension plate is higher than the top surface of the plate feeding trolley but lower than the top surface of the push claws on the plate feeding trolley.

2. The plate feeder in the brick-making equipment as described in claim 1, characterized in that: After the pallet moves to the second-to-last station of the pallet delivery trolley, when the pallet delivery trolley moves forward one station in the next round, the pusher claw pushes the pallet on the second-to-last station of the pallet delivery trolley from the pallet delivery trolley to the heightening plate.

3. The plate feeder in the brick-making equipment as described in claim 2, characterized in that: When the last station of the plate delivery trolley enters the heightening plate position, the last pusher located at the end of the plate delivery trolley pushes the pallet on the heightening plate away from the heightening plate. The last pusher extends out of the end of the heightening plate and is located at the beginning end of the second-to-last pusher of the plate delivery trolley that extends into the heightening plate.

4. The plate feeder in the brick-making equipment as described in claim 1, characterized in that: The heightening plate is a replaceable wear-resistant plate, and the quantity is more than one.

5. The plate feeder in the brick-making equipment as described in claim 1, characterized in that: A pressure plate frame is provided at the end of the raised plate to prevent the support plate from tilting. The pressure plate frame is provided with two extension plates extending toward the two raised plates respectively and multiple pressure plate wheels locked to the bottom of the extension plates. The distance between the pressure plate wheels and the raised plate is greater than the thickness of the support plate.

6. The plate feeder in the brick-making equipment as described in claim 1, characterized in that: The feeding trolley has two parallel support rods, and each support rod has a plurality of corresponding push claws at equal intervals. The middle guide rail frame has a sliding groove on the side facing the support rods, and a plurality of rollers sliding on the sliding groove are provided on the outer side of the two support rods.

7. The plate feeder in the brick-making equipment as described in claim 6, characterized in that: The first drive mechanism has a first chain gear, a second chain gear, a chain tensioned around the outer ring of the first chain gear and the second chain gear, and a drive motor that drives the first chain gear and the second chain gear to rotate in the forward or reverse direction. The straight section of the chain is arranged parallel to the plate feeding trolley, and multiple reinforcing rods are connected between the two support rods of the plate feeding trolley. A connecting block connected to the chain is provided on the reinforcing rod near the end of the plate feeding trolley.

8. The plate feeder in the brick-making equipment as described in claim 1, characterized in that: The two lifting frames are each provided with multiple downward-extending vertical sections, and the bottom end of each vertical section is provided with a first pivot seat; the frame is provided with a second pivot seat corresponding to each first pivot seat, and the first and second pivot seats provided vertically are respectively rotatably pivotally connected to the two ends of a linkage rod; the second drive mechanism has a piston seat locked on the frame and a piston rod locked on the lifting frame; the second drive mechanism extends the piston rod to push the lifting frame to rise and lift the pallet away from the pallet feeding trolley or intermediate guide rail frame, and the second drive mechanism retracts the piston rod to pull the lifting frame to fall and place the pallet on the pallet feeding trolley or intermediate guide rail frame.

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