Production line with storage function

Abstract

The utility model relates to the technical field of production equipment, in particular to a production line with a storage function, which comprises a machining conveying line and a storage device arranged at the outlet end of the machining conveying line, the machining conveying line is used for conveying workpieces and allowing the workpieces to be machined thereon, and the storage device is used for storing the workpieces machined on the machining conveying line; the storage device comprises a plurality of storage assemblies used for storing workpieces and a power mechanism, and the power mechanism is used for driving the storage assemblies to move, so that at least one storage assembly is in butt joint with the machining conveying line to bear the workpieces from the machining conveying line. The storage device is arranged at the outlet end of the machining conveying line and comprises the power mechanism and the multiple storage assemblies, the multiple storage assemblies can store multiple workpieces at a time, and no matter how the speed difference between two adjacent production lines is, the workpieces can be stored in the storage assemblies at a time. And conveying of the workpieces on the machining conveying line can be adjusted by increasing the number of the storage assemblies.

Description

Technical Field

[0001] The utility model relates to the technical field of production equipment, in particular to a production line with storage. Background Art

[0002] A production line, also known as an assembly line or assembly line, is a production method in industry, where each production unit focuses on processing only a certain segment of work to improve work efficiency and output. The production of a complete product usually requires the cooperation of multiple production lines, but due to the different processing times required for different processing steps, the moving speed of workpieces (semi-finished products) on different production lines is also different. For example, the moving speed of the front production line is faster than that of the back production line. If there is no effective intervention, the workpieces will be piled up between the two production lines, affecting the normal processing of the workpieces.

[0003] The Chinese patent document with publication number CN103204369A provides a support mechanism on the belt conveyor to lift the workpiece away from the belt conveyor, so that the workpiece will not move with the belt conveyor during the lifting period, and then fall down and move with the belt conveyor after a period of time, which can avoid the situation where a large number of workpieces appear in the processing area. However, this solution can only deal with the situation where the speed difference between the production lines at the front and rear ends of the belt conveyor (i.e., the "roller conveyor" in CN103204369A) is small, but cannot solve the situation where the speed difference between the two production lines is large. Summary of the invention

[0004] The utility model aims to provide a production line with storage to solve the problem of mismatch in workpiece transmission between two production lines with different speeds.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is: a production line with storage, comprising a processing conveyor line and a storage device arranged at the outlet end of the processing conveyor line, the processing conveyor line is used to transport workpieces and provide the workpieces for processing thereon, and the storage device is used to store the workpieces processed on the processing conveyor line; the storage device includes a plurality of storage components and a power mechanism for storing the workpieces, and the power mechanism is used to drive the storage components to move, so that at least one of the storage components is docked with the processing conveyor line to receive the workpieces from the processing conveyor line.

[0006] In one embodiment, the storage components are arranged at intervals in the vertical direction, and the power mechanism is used to drive the storage components to move up and down so that one of the storage components in the vertical direction is docked with the processing conveyor line.

[0007] In one embodiment, the storage components are arranged at intervals on the storage rack along the up-down direction, and the storage rack is connected to the power mechanism and moves up-down under the drive of the power mechanism, thereby driving the storage components to move along the up-down direction.

[0008] In one embodiment, the power mechanism includes a lifting motor, two screws and two nuts. The lifting motor is arranged above the storage rack. Each screw and the nut form a set of threaded transmission components. A set of threaded transmission components is provided on the opposite sides of the storage rack. The nut is fixedly connected to the storage rack. The lifting motor is connected to the screw to drive the screw to rotate. The nut is lifted and lowered along the screw under the rotation of the screw, thereby driving the storage rack to lift and lower.

[0009] In one embodiment, the storage device further comprises a storage conveyor line connected to the processing conveyor line, wherein the storage conveyor line is used to convey the workpieces from the processing conveyor line and adjust the positions of the workpieces in the storage assembly.

[0010] In one embodiment, the storage device is provided with a frame, the storage conveyor line includes two conveyor belts spaced apart in a horizontal direction, and the conveyor belts are arranged on the frame, and the storage component includes a storage piece arranged between the two conveyor belts, and the storage component is raised to transfer the workpieces on the storage conveyor line to the storage piece to realize the storage function of the storage component.

[0011] In one embodiment, a first sensor is provided between the storage device and the processing conveyor line, and the first sensor is used to detect whether the workpiece exists between the storage assembly and the processing conveyor line.

[0012] In one embodiment, a second sensor is provided at one end of the storage component away from the processing conveyor line, and the second sensor is used to detect whether the workpiece reaches a designated position of the storage component.

[0013] In one embodiment, a third sensor is provided on the side of the storage device away from the processing conveyor line, and the third sensor is used to detect whether foreign matter enters the storage device from the side away from the processing conveyor line.

[0014] In one embodiment, a UV curing device is provided above the processing conveyor line. The UV curing device is arranged to be raised and lowered relative to the processing conveyor line. The UV curing device includes a UV lamp for UV curing the workpiece, so that the workpiece is processed on the processing conveyor line.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model sets a storage device at the outlet end of the processing conveyor line. The storage device includes a power mechanism and multiple storage components. The multiple storage components can store multiple workpieces at one time. No matter how the speed difference between two adjacent production lines is, the transportation of the workpieces on the processing conveyor line can be adjusted by increasing the number of storage components. Secondly, the power mechanism drives the storage components to move, so that at least one storage component is connected to the processing conveyor line to receive the workpieces from the processing conveyor line. The processing conveyor line is adapted to the movement of the storage components, which has little effect on the speed of the processing conveyor line and the processing of the workpieces. Thirdly, the storage components are directly connected to the processing conveyor line, which can simplify the mechanical structure and control method between the storage device and the processing conveyor line, make the operation more reliable and reduce the manufacturing cost of the production line.

[0017] 2. The storage components are arranged at intervals in the vertical direction, and are driven by a power mechanism to move up and down so that each storage component is connected to the processing conveyor line in turn to store the workpiece, making full use of the height space and reducing the floor space of the storage device.

[0018] 3. The power mechanism composed of the lifting motor and the threaded transmission assembly is easy to control and is convenient for the storage rack to stop at the required height to receive the workpiece.

[0019] 4. The storage conveyor line composed of two conveyor belts is arranged horizontally at intervals from the storage components. The two do not interfere with each other in the up and down movements. When the storage components are lower than the conveyor belt, the conveyor belt controls the movement of the workpiece. When the storage components are higher than the conveyor belt, the workpiece is placed on the storage components. The conveyor belt is set on the frame, so the position of the conveyor belt in the up and down directions is fixed, so the conveyor belt can transport the workpiece to each storage component and adjust the position of the workpiece on the storage component.

[0020] 5. The first sensor can detect whether there are workpieces between the storage device and the processing conveyor line, so as to start the storage conveyor line in time to transport the workpieces to the storage assembly and avoid the accumulation of workpieces between the storage device and the processing conveyor line; the second sensor can detect whether the workpiece reaches the side of the storage assembly away from the processing conveyor line, so as to find out in time whether the workpiece is in place and prevent it from falling; the third sensor can detect whether foreign objects enter the storage device, so as to avoid operators entering the storage device due to misoperation, thereby ensuring the safety of the device.

[0021] 6. The time for UV lamp to cure the workpiece needs to be controlled within a certain range. If the cured workpiece is not transferred to the storage device for temporary storage in time, it may cause workpiece accumulation on the processing conveyor line. The workpieces accumulated under the UV lamp will be exposed to the light for too long due to the accumulation, resulting in damage to the workpiece and even safety accidents. The storage device of the utility model can solve the problem of workpiece accumulation caused by speed mismatch between the two production lines, improve the production efficiency of the workpiece, and reduce the risk factor of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a stereogram of an embodiment of the utility model.

[0023] Figure 2 It is an internal structure diagram of an embodiment of the utility model.

[0024] Figure 3 It is a partial structural diagram of a storage device according to an embodiment of the utility model.

[0025] Figure 4 It is a partial structural diagram of a storage conveyor line according to an embodiment of the utility model.

[0026] Among them: 1 processing conveyor line, 2 storage device, 21 storage component, 211 storage piece, 212 connecting rod, 22 power mechanism, 221 lifting motor, 222 screw, 223 nut, 23 storage rack, 231 support rod, 232 top plate, 233 guide slider, 234 guide rod, 24 rack, 25 storage conveyor line, 251 conveyor belt, 252 conveying motor, 253 connecting plate, 26 second sensor, 27 third sensor, 3 first sensor, 4UV curing equipment, 40UV lamp, F pallet. DETAILED DESCRIPTION

[0027] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0028] See also Figures 1 to 3As shown, the utility model discloses a production line with storage, including a processing conveyor line 1 and a storage device 2 arranged at the outlet end of the processing conveyor line 1, the processing conveyor line 1 is used to convey workpieces and provide the workpieces for processing thereon, and the storage device 2 is used to store the workpieces processed on the processing conveyor line 1. The workpiece (not shown in the figure) is placed on a pallet F, the processing conveyor line 1 conveys the workpiece by conveying the pallet F, and the storage device stores the workpiece by storing the pallet F, and each pallet F can be used to place one or more workpieces.

[0029] The storage device 2 includes a plurality of storage components 21 for storing workpieces and a power mechanism 22, wherein the power mechanism 22 is used to drive the storage components 21 to move, so that at least one storage component 21 is docked with the processing conveyor line 1 to receive the workpieces from the processing conveyor line 1. In this example, only one storage component 21 is docked with the processing conveyor line 1 at a time and one storage component 21 only places one tray F. In other embodiments, the number of storage components 21 docked with the processing conveyor line 1 at one time can be increased by increasing the number of storage components 21 in the conveying direction of the processing conveyor line 1, thereby increasing the number of workpieces stored in the storage device 2.

[0030] The utility model sets a storage device 2 at the outlet end of the processing conveyor line 1. The storage device 2 includes a power mechanism 22 and a plurality of storage components 21. The plurality of storage components 21 can store a plurality of workpieces at one time. No matter how the speed difference between two adjacent production lines is, the conveying of the workpieces on the processing conveyor line 1 can be adjusted by increasing the number of storage components 21. Secondly, the power mechanism 21 drives the storage components 22 to move, so that at least one storage component is connected to the processing conveyor line to receive the workpieces from the processing conveyor line, and the processing conveyor line is adapted to the movement of the storage components, which has little effect on the speed of the processing conveyor line and the processing of the workpieces. Thirdly, the storage components are directly connected to the processing conveyor line, which can simplify the mechanical structure and control method between the storage device and the processing conveyor line, make the operation more reliable and reduce the manufacturing cost of the production line.

[0031] The plane where the processing conveyor line 1 conveys the workpiece is defined as the horizontal plane, and the direction perpendicular to the horizontal plane is defined as the up and down direction.

[0032] See also Figures 2 to 4As shown, the storage components 21 are arranged at intervals in the vertical direction, and the power mechanism 22 is used to drive the storage components 21 to move up and down so that one of the storage components 21 in the vertical direction is docked with the processing conveyor line 1. The storage components 21 are arranged at intervals in the vertical direction on the storage rack 23, and the storage rack 23 is connected to the power mechanism 22 and moves up and down under the drive of the power mechanism 22, thereby driving the storage components 21 to move in the vertical direction. The storage rack 23 is provided with four support rods 231 and a top plate 232, and the top plate 232 is arranged at the top of the support rod 231 and fixedly connected to the support rod 231. The storage components 21 are arranged at intervals between the four support rods, and the lifting of the storage rack 23 drives the lifting of the storage components 21. The power mechanism 22 includes a lifting motor 221, two screw rods 222 and two nuts 223. The lifting motor 221 is arranged above the storage rack 23. Each screw rod 221 and the nut 223 form a set of threaded transmission components. A set of threaded transmission components is respectively arranged on opposite sides of the storage rack 23. The nuts 223 are fixedly connected to the storage rack 23, more specifically, the nuts 223 are fixedly connected to opposite sides of the top plate 232 to maintain the balance of the two sides of the storage rack 23. The lifting motor 221 is connected to the screw rod 222 to drive the screw rod 222 to rotate. The nut 223 is lifted and lowered along the screw rod 222 under the rotation of the screw rod 222, thereby driving the storage rack 23 to lift and lower.

[0033] In order to make the storage rack 23 and the storage assembly 21 more stable during the lifting process, each support rod 231 is provided with a guide mechanism, which includes a guide slider 233 fixedly arranged on the support rod 231 and a guide rod 234 fixedly connected to the frame 24. The guide slider 233 is slidably connected to the guide rod 234. As the storage rack 23 is lifted or lowered, the guide slider 233 slides along the guide rod 234 to maintain the storage rack 23 and the storage assembly 21 to be lifted or lowered stably.

[0034] The storage component 21 includes a storage part 211 and two connecting rods 212. The two ends of the connecting rod 212 are respectively connected to a support rod 231. The storage part 211 is fixedly arranged on the connecting rod 212. The storage part 211 in this example is a slender plate. The two slender plates are arranged at intervals to form a storage table for carrying the tray F. The interval between the two slender plates forms a clearance groove for the operator to reach in and take the tray. In other embodiments, the storage part 211 can be a storage flat plate with a larger width, so that the tray is more stable on it.

[0035] The storage device 2 also includes a storage conveyor line 25 connected to the processing conveyor line 1. The storage conveyor line 25 is used to transport workpieces from the processing conveyor line 1 and adjust the position of the workpieces in the storage assembly 21, more specifically, to adjust the position of the pallet and the workpiece in the conveying direction of the storage conveyor line 25.

[0036] The storage conveyor line 25 of this example includes two conveyor belts 251 spaced apart in the horizontal direction, each conveyor belt 251 is connected to a conveying motor 252, and the conveyor belt 251 is set on the frame 24. The conveyor belt 251 is set on the frame 24 through a connecting plate 253. The conveyor belt 251 of this example is a belt conveyor arranged on both sides of the storage part 211, so that the storage part 211 is between the two conveyor belts 251. The stability of the pallet F is improved by the larger spacing between the two conveyor belts 251. Since the conveyor belt 251 is arranged on the frame 24, the conveyor belt 251 is fixed in the up and down direction, while the storage component 21 and the storage rack 23 are movable. Therefore, when a storage component 21 that is lower than the conveyor belt 251 and closest to the conveyor belt 251 rises from a position lower than the conveyor belt 251 to a position higher than the conveyor belt 251, the pallet F and the workpiece on the conveyor belt 251 can be lifted up, so that the workpiece on the storage conveyor line 25 is transferred to the storage component 211 with the help of the rising storage component 21 to realize the storage function of the storage component 21.

[0037] In addition to being the belt conveyor in this example, in other embodiments, the conveyor belt 251 may also be a roller conveyor belt or a chain conveyor belt arranged on both sides of the storage unit 211 .

[0038] See also Figure 3 As shown, a first sensor 3 is provided between the storage device 2 and the processing conveyor line 1, and the first sensor 3 is used to detect whether there is a pallet F or a workpiece between the storage assembly 21 and the processing conveyor line 1. When the first sensor 3 detects the presence of a workpiece, the storage device 2 starts the storage conveyor line 25 to promptly transport the pallet F and the workpiece thereon to the storage assembly 21, so as to avoid a large number of workpieces being piled up on the processing conveyor line 1.

[0039] See also Figure 2 and Figure 3 As shown, a second sensor 26 is provided at one end of the storage assembly 21 away from the processing conveyor line 1, and the second sensor 26 is used to detect whether the workpiece has reached the specified position of the storage assembly 21. When the pallet F and the workpiece reach the detection range of the second sensor 26, the storage conveyor line 25 stops running to stop the pallet in the conveying direction of the storage conveyor line, and drives the storage rack 23 and the storage assembly 21 to rise, so as to lift the pallet F and the workpiece on the storage conveyor line 25 to the top of the storage conveyor line 25, so as to store the pallet F and the workpiece. In addition, when the pallet F and the workpiece reach the detection range of the second sensor 26, the storage conveyor line 25 stops running in time, which can prevent the pallet F and the workpiece from falling from the exit of the storage assembly 21.

[0040] The first sensor 3 and the second sensor 26 can both be a photoelectric sensor, an infrared sensor or an electromagnetic wave sensor.

[0041] A third sensor 27 is provided on the side of the storage device 2 away from the processing conveyor line 1. The third sensor 27 is used to detect whether there is a foreign object entering the storage device 2 from the side away from the processing conveyor line 1. In this example, the third sensor 27 is a grating composed of multiple photoelectric sensors, which is arranged at the exit end of the storage component 21, that is, the end away from the processing conveyor line 1. In other embodiments, it can also be on the other two sides of the storage device 2 that are not in contact with the processing conveyor line, that is, the side close to the storage conveyor line 25. The existence of the third sensor 27 mainly plays a safety role to prevent the operator from reaching into the storage device 2 during the operation of the storage device 2 and causing danger. The exit end of the storage component 21 is the area where the operator takes the tray F and the workpiece, so it is more likely that foreign objects will enter this side. In this example, the third sensor 27 is arranged on this side to ensure the safety of the operator. On the other two sides, the entry of foreign objects will also affect the operation of the storage device 2, so the third sensor is arranged on the three sides away from the processing conveyor line 1 to further improve the safety of the storage device.

[0042] The storage components 21 of the above embodiment are arranged at intervals in the vertical direction, which can fully utilize the height space and reduce the floor space of the storage device. In other embodiments, the storage components 21 can also be arranged at intervals in the horizontal direction to facilitate the removal of the trays F and workpieces on the storage components 21.

[0043] The production line of the utility model is used for UV curing of workpieces. The workpiece is a PCB circuit board with a coating on the surface. A UV curing device 4 is arranged above the processing conveyor line 1. The UV curing device 4 is arranged to be liftable relative to the processing conveyor line, so that the height difference between the UV light source and the workpiece can be adjusted to obtain a better irradiation effect. A screw lifting mechanism is arranged between the UV curing device 4 and the production conveyor line 1, so as to realize the lifting and lowering of the UV curing device 4 relative to the processing conveyor line. The UV curing device 4 includes a UV lamp 40 for UV curing the workpiece, so that the workpiece is processed on the processing conveyor line. The processing of the workpiece in this example means that the photosensitizer in the coating glue on the surface of the workpiece absorbs ultraviolet light under the irradiation of ultraviolet light to produce active free radicals or cations, which triggers a monomer polymerization cross-linking chemical reaction, so that the adhesive is converted from liquid to solid within a few seconds, thereby curing the coating. The production conveyor line 1 in this example is a belt conveyor belt. In other embodiments, it can also be a chain conveyor belt or a roller conveyor belt.

[0044] The time for UV lamp to cure the workpiece needs to be controlled within a certain range. If the cured workpiece is not transferred to the storage device 2 for temporary storage in time, it may cause workpiece accumulation on the processing conveyor line 1, and the workpieces accumulated under the UV lamp will be exposed to too long due to the accumulation, resulting in damage to the workpiece and even safety accidents. The storage device 2 of the utility model can solve the problem of workpiece accumulation caused by speed mismatch between the two production lines, improve the production efficiency of the workpiece, and reduce the risk factor of production.

[0045] The working process of the utility model is as follows: the workpiece is placed on the pallet F, which is placed on the production conveyor line 1 and is transported from the inlet end of the production conveyor line 1 to the outlet end of the production conveyor line 1 as the production conveyor line 1 runs, and is cured by the UV curing device 4 during the transportation process. In the initial state, the storage rack 23 and the storage assembly 21 are at the lowest point. When the first sensor 3 detects the pallet F and the workpiece, the storage conveyor line 25 runs to transport the pallet and the workpiece forward until they reach the detection range of the second sensor 26, the storage conveyor line 25 stops, and the power mechanism 22 drives the storage rack 23 and the storage assembly 21 to move upward, and lifts the pallet F and the workpiece on the storage conveyor line 25 until the next layer of the storage assembly 21 reaches the preset position. The preset position should make the top surface of the next layer of the storage assembly 21 lower than the storage conveyor line 25 and the upper layer of the storage assembly 21 is sufficiently far from the storage conveyor line 25, so that the storage assemblies on the upper and lower layers of the storage conveyor line 25 will not affect the transportation of the storage conveyor line 25. Repeat the detection of the first sensor 3, the operation of the storage conveyor line 25 and the rise of the storage component 21. If the storage component 21 is full, the production conveyor line 1 is stopped and the UV curing device 4 is turned off to prevent the UV lamp from continuously irradiating and damaging the production conveyor line 1 or the workpiece; if the storage component 21 is not full but the operator needs to take the pallet F and the workpiece, the production conveyor line 1 can be manually stopped, the UV curing device 4 can be turned off, the storage rack lifting and storage conveyor line 25 of the storage device 2 can be stopped, and the third sensor 27 can be turned off to stop its detection so that the operator can reach out to take the pallet F. After all the pallets F on the storage device 2 are taken away, the storage device 2 returns to the initial state to prepare for the next work. The number of storage components 21 of the utility model is limited, and it is mainly used for temporary storage of workpieces processed on the production line to solve the problem of speed mismatch between two adjacent production lines. The workpieces taken from the storage device 2 can be supplied to multiple production lines of the same type at one time for production operations.

[0046] Although the present invention is specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that the remaining undescribed portions are prior art, and that various changes made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims shall fall within the scope of protection of the present invention.

Claims

1. A production line with storage, characterized in that: It includes a processing conveyor line and a storage device arranged at the exit end of the processing conveyor line, the processing conveyor line is used to transport workpieces and provide the workpieces for processing thereon, and the storage device is used to store the workpieces processed on the processing conveyor line; the storage device includes a plurality of storage components and a power mechanism for storing the workpieces, and the power mechanism is used to drive the storage components to move, so that at least one of the storage components is docked with the processing conveyor line to receive the workpieces from the processing conveyor line.

2. A production line with storage according to claim 1, characterized in that: The storage components are arranged at intervals in the vertical direction, and the power mechanism is used to drive the storage components to move up and down so that one of the storage components in the vertical direction is docked with the processing conveyor line.

3. A production line with storage according to claim 2, characterized in that: The storage components are arranged at intervals on the storage rack along the up-down direction. The storage rack is connected to the power mechanism and moves up-down under the drive of the power mechanism, thereby driving the storage components to move along the up-down direction.

4. A production line with storage according to claim 3, characterized in that: The power mechanism includes a lifting motor, two screws and two nuts. The lifting motor is arranged above the storage rack. Each screw and the nut form a group of threaded transmission components. A group of threaded transmission components is provided on the opposite sides of the storage rack. The nut is fixedly connected to the storage rack. The lifting motor is connected to the screw to drive the screw to rotate. The nut is lifted and lowered along the screw under the rotation of the screw, thereby driving the storage rack to lift and lower.

5. A production line with storage according to claim 2, characterized in that: The storage device also includes a storage conveyor line connected to the processing conveyor line, and the storage conveyor line is used to convey the workpieces from the processing conveyor line and adjust the positions of the workpieces in the storage assembly.

6. A production line with storage according to claim 5, characterized in that: The storage device is provided with a frame, the storage conveyor line includes two conveyor belts spaced apart in the horizontal direction, and the conveyor belts are arranged on the frame, and the storage component includes a storage piece arranged between the two conveyor belts, and the storage component is raised to transfer the workpieces on the storage conveyor line to the storage piece to realize the storage function of the storage component.

7. The production line with storage according to claim 1, characterized in that: A first sensor is disposed between the storage device and the processing conveyor line, and the first sensor is used to detect whether the workpiece exists between the storage assembly and the processing conveyor line.

8. The production line with storage according to claim 1, characterized in that: A second sensor is provided at one end of the storage component away from the processing conveyor line, and the second sensor is used to detect whether the workpiece reaches a designated position of the storage component.

9. The production line with storage according to claim 1, characterized in that: A third sensor is provided on the side of the storage device away from the processing conveyor line, and the third sensor is used to detect whether there is a foreign object entering the storage device from the side away from the processing conveyor line.

10. The production line with storage according to claim 1, characterized in that: A UV curing device is provided above the processing conveyor line. The UV curing device is arranged to be liftable relative to the processing conveyor line. The UV curing device comprises a UV lamp for performing UV curing irradiation on the workpiece, so that the workpiece is processed on the processing conveyor line.

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