CN221257040U - Damping device of reciprocating vacuum pump - Google Patents
Damping device of reciprocating vacuum pump Download PDFInfo
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- CN221257040U CN221257040U CN202322741463.0U CN202322741463U CN221257040U CN 221257040 U CN221257040 U CN 221257040U CN 202322741463 U CN202322741463 U CN 202322741463U CN 221257040 U CN221257040 U CN 221257040U
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- vacuum pump
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- reciprocating
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- 238000013016 damping Methods 0.000 title claims description 69
- 230000008093 supporting effect Effects 0.000 claims abstract description 62
- 229920000742 Cotton Polymers 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 4
- 241001330002 Bambuseae Species 0.000 claims description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 238000009423 ventilation Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 description 25
- 230000017525 heat dissipation Effects 0.000 description 14
- 238000009434 installation Methods 0.000 description 14
- 239000000872 buffer Substances 0.000 description 6
- 230000035939 shock Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
- 230000003245 working effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000006173 Good's buffer Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The utility model discloses a vibration damper of a reciprocating vacuum pump, which relates to the technical field of vibration damper of the vacuum pump and comprises a base, wherein a supporting plate is arranged at the top of the base, a vacuum pump mounting box is fixedly connected to the top of the supporting plate, an upper connecting frame and a lower connecting frame are respectively and fixedly connected to the bottom of the supporting plate and the top of the base, guide grooves are formed in the bottom of the supporting plate and the top of the base, and the reciprocating vacuum pump is movably mounted in the vacuum pump mounting box through a mounting seat. According to the utility model, after the reciprocating vacuum pump works to generate vibration, the supporting plate is subjected to pressure from the vacuum pump mounting box, so that the supporting plate moves downwards, the distance between the base and the supporting plate is reduced when the supporting plate moves downwards, the included angle between the upper supporting rod and the lower supporting rod is reduced, the upper connecting plate drives the damper to move downwards and extrude the first spring, and the vibration force generated by the working of the reciprocating vacuum pump is buffered and damped in the first step.
Description
Technical Field
The utility model relates to the technical field of vacuum pump damping, in particular to a damping device of a reciprocating vacuum pump.
Background
The reciprocating type oil-free vacuum pump (also called as piston type vacuum pump) is a dry type vacuum pump; the device sucks and discharges gas by means of reciprocating motion of a piston in a cylinder, and is suitable for vacuum conveying, material lifting, distillation, concentration pressure swing adsorption, drying and other occasions in the fields of petroleum, chemical industry, pharmacy, metallurgy and the like. In the use process of the reciprocating type oilless vacuum pump, the piston can reciprocate to suck and exhaust gas, and when the piston rapidly reciprocates, the vacuum pump can vibrate, the vibration can influence the operation working condition of the vacuum pump, so that the vibration reduction device is required to be used for carrying out vibration reduction treatment on the reciprocating vacuum pump.
For example, chinese patent publication No. CN213478598U discloses a damping buffer device for vacuum pump, this damping buffer device for vacuum pump, through setting up damping spring bumper shock absorber and rubber isolator, make the pump body carry out the first step and slow down in the vibrations that produce in the operation, then remaining vibrations force passes through the conduction platform and transmits on the connecting plate, the connecting plate can drive the installation piece synchronous vibration at vibrations in-process, thereby make articulated pole change under vibrations force effect angle, drive the sliding block left and right sides displacement, thereby change the vertical vibrations power that the top structure produced into horizontal vibrations power, and further absorb the vibrations power that its produced through damping spring, the whole purpose that has reached shock attenuation effect is good, greatly increased damping buffer device's shock attenuation effect.
The following problems exist in the prior art:
According to the damping buffer device, the pump body is fixedly connected with the conduction platform, the conduction platform is fixedly installed with the connecting plate, then the connecting plate is fixedly installed with the side rods, the conduction platform cannot move between the connecting plate and the side rods when being subjected to vibration generated by the operation of the pump body, the connecting plate cannot press the mounting blocks downwards, so that the hinge rod cannot be extruded to push the sliding blocks, the damping spring cannot be compressed, and damping treatment cannot be performed; because the reciprocating vacuum pump can produce a large amount of heat when working, when the heat is great, the reciprocating vacuum pump can stop working to influence the normal clear of production.
Disclosure of utility model
The utility model provides a damping device of a reciprocating vacuum pump, which aims to solve the problems in the background technology.
In order to solve the technical problems, the utility model adopts the following technical scheme:
The utility model provides a reciprocating vacuum pump damping device, includes the base, the top of base is provided with the backup pad, the top fixedly connected with vacuum pump mounting box of backup pad, the link and lower link are gone up to the bottom of backup pad and the top of base fixedly connected with respectively, the guide way has all been seted up at the bottom of backup pad and the top of base, the inside of vacuum pump mounting box has reciprocating vacuum pump through mount pad movable mounting, the louvre has all been seted up at the left and right sides both ends of vacuum pump mounting box.
The inner sides of the lower connecting frame and the upper connecting frame are respectively connected with a lower supporting rod and an upper supporting rod in a rotating mode, two damping cylinders are arranged at the top of the base, hinge seats are fixedly connected to one sides of the damping cylinders which are separated, a lower connecting plate is fixedly connected to the upper surface of the lower supporting rod, an upper connecting plate is fixedly connected to the lower surface of the upper supporting rod, a damper is movably mounted between one ends of the upper connecting plate and the opposite ends of the lower connecting plate, a first spring is sleeved outside the damper, a connecting rod is arranged between one sides of the damping cylinders which are opposite, and a second spring is sleeved on the outer wall of the connecting rod.
The top of the vacuum pump mounting box is provided with a vent hole, and the top of the vacuum pump mounting box is movably provided with a heat dissipation fan at the position of the vent hole.
The technical scheme of the utility model is further improved as follows: the inner side of the hinge seat is movably connected with the other ends of the upper supporting rod and the lower supporting rod, and two ends of the first spring are fixedly connected with the bottom of the upper connecting plate and the top of the lower connecting plate respectively.
The technical scheme of the utility model is further improved as follows: two opposite sides of the damping cylinders are provided with through holes, and two ends of the connecting rod are fixedly connected with damping plates.
The technical scheme of the utility model is further improved as follows: the outer walls of the damping plate and the connecting rod are respectively connected with the damping cylinders and the inner wall of the through hole in a sliding mode, and two ends of the second spring are respectively fixedly connected with one side, opposite to the two damping cylinders, of the second spring.
The technical scheme of the utility model is further improved as follows: the top and the bottom of two damping section of thick bamboo are all fixedly connected with elastic telescopic link, the one end that elastic telescopic link kept away from the damping section of thick bamboo rotates and is connected with the ball, ball and guide way sliding connection.
The technical scheme of the utility model is further improved as follows: the inside fixedly connected with soundproof cotton of vacuum pump install bin, the inner wall fixedly connected with dust screen of louvre.
By adopting the technical scheme, compared with the prior art, the utility model has the following technical progress:
1. The utility model provides a vibration damper of a reciprocating vacuum pump, which adopts an upper supporting rod, a lower supporting rod, an upper connecting plate, a damper, a first spring, a damping cylinder and a connecting rod to be matched with each other, the upper supporting rod and the lower supporting rod can play a supporting role on the supporting plate, after the reciprocating vacuum pump works, the supporting plate can receive pressure from a vacuum pump mounting box, so that the supporting plate moves downwards, the distance between a base and the supporting plate is reduced when the supporting plate moves downwards, the included angle between the upper supporting rod and the lower supporting rod is reduced, the upper connecting plate drives the damper to move downwards and press the first spring, the rest vibration force can be transmitted to the damping cylinder through a hinging seat by the upper supporting rod, the distance between the base and the supporting plate is reduced, the distance between the two damping cylinders is reduced, the damping cylinder drives balls on an elastic telescopic rod to be in a guide groove, the second spring is extruded, the damping plate can buffer the rest force in the guide groove, the vibration damper has a good buffer effect on the vibration damper, the vibration damper can play a role in the vacuum pump, and the vacuum pump can work effect is improved by the guide groove, and the vibration damper can be realized.
2. The utility model provides a vibration damper of a reciprocating vacuum pump, which adopts the mutual coordination among a vent hole, a radiating hole, a dustproof net, a radiating fan and soundproof cotton, fresh air is pumped into a vacuum pump mounting box through the vent hole by starting the radiating fan to work, so that the air is covered on the reciprocating vacuum pump, thereby achieving the effect of radiating, cold air can enter the vacuum pump mounting box through the vent hole, heat gas is discharged through the radiating hole, the circulation of the air is realized, the air flow in the vacuum pump mounting box is improved, the phenomenon of shutdown caused by the temperature rise during the operation of the reciprocating vacuum pump is reduced, the working effect of the reciprocating vacuum pump is improved, the normal operation of production is avoided, the dustproof effect can be achieved on the radiating hole through the dustproof net, and meanwhile, the soundproof cotton can play the role of soundproof for noise generated during the operation of the reciprocating vacuum pump.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of the lower and upper connector frames of the present utility model;
FIG. 3 is a schematic cross-sectional view of a damper cylinder according to the present utility model;
Fig. 4 is a schematic cross-sectional structure of the vacuum pump mounting box of the present utility model.
In the figure: 1. a base; 11. a guide groove; 2. a lower connecting frame; 21. a lower support rod; 22. a lower connecting plate; 3. a support plate; 31. an upper connecting frame; 32. an upper support rod; 33. an upper connecting plate; 34. a damper; 35. a first spring; 4. a vacuum pump mounting box; 41. a heat radiation hole; 42. a dust screen; 43. soundproof cotton; 44. a vent hole; 45. a mounting base; 5. a damping cylinder; 51. a hinge base; 52. an elastic telescopic rod; 53. a ball; 54. a through hole; 55. a connecting rod; 56. a damping plate; 57. a second spring; 6. a heat dissipation fan; 7. and a reciprocating vacuum pump.
Detailed Description
The utility model is further illustrated by the following examples:
Example 1
As shown in fig. 1-4, the utility model provides a vibration damping device for a reciprocating vacuum pump, which comprises a base 1, the top of the base 1 is provided with a supporting plate 3, the top of the supporting plate 3 is fixedly connected with a vacuum pump installation box 4, the bottom of the supporting plate 3 and the top of the base 1 are respectively fixedly connected with an upper connecting frame 31 and a lower connecting frame 2, the bottom of the supporting plate 3 and the top of the base 1 are both provided with guide grooves 11, the inside of the vacuum pump installation box 4 is movably provided with the reciprocating vacuum pump 7 through an installation seat 45, the left and right ends of the vacuum pump installation box 4 are both provided with radiating holes 41, the inner sides of the lower connecting frame 2 and the upper connecting frame 31 are respectively and rotatably connected with a lower supporting rod 21 and an upper supporting rod 32, the top of the base 1 is provided with two damping cylinders 5, one side, which is away from each other, of the two damping cylinders 5 is fixedly connected with a hinge seat 51, the upper surface of the lower supporting rod 21 is fixedly connected with a lower connecting plate 22, the lower surface of the upper connecting rod 33 is fixedly connected with the lower connecting plate 33, one end, which is opposite to the upper connecting plate 22, a damper 34 is movably installed between the upper connecting plate 33 and the opposite ends of the upper connecting plate 22 are respectively, the outer side of the damper 34 is sleeved with a spring 35, the vent hole 41 is respectively, the vent holes 55 are respectively arranged between the two connecting rods 5 and the two vent holes 4 are movably connected with the vent holes 44, the vent holes 55 are respectively, and the vent holes 44 are arranged at the vent holes 4, respectively, and the vent holes are arranged.
In this embodiment, fresh air is pumped into the vacuum pump installation box 4 through the vent hole 44 by starting the heat dissipation fan 6 to enable the air to cover the reciprocating vacuum pump 7, so that the heat dissipation effect is achieved, the heat air is discharged through the heat dissipation holes 41, the supporting plate 3 can be supported through the upper supporting rod 32 and the lower supporting rod 21, after the reciprocating vacuum pump 7 works to generate vibration, the supporting plate 3 can receive the pressure from the vacuum pump installation box 4, the supporting plate 3 moves downwards, the distance between the base 1 and the supporting plate 3 is reduced when the supporting plate 3 moves downwards, the included angle between the upper supporting rod 32 and the lower supporting rod 21 is reduced, the upper connecting plate 33 drives the damper 34 to move downwards and presses the first spring 35, and the vibration force generated by the operation of the reciprocating vacuum pump 7 can be buffered and damped.
Example 2
As shown in fig. 1-4, on the basis of embodiment 1, the present utility model provides a technical solution: preferably, the inner side of the hinge seat 51 is movably connected with the other ends of the upper support rod 32 and the lower support rod 21, two ends of the first spring 35 are fixedly connected with the bottom of the upper connection plate 33 and the top of the lower connection plate 22 respectively, through holes 54 are formed in one side, opposite to the two damping cylinders 5, of the first spring, damping plates 56 are fixedly connected with two ends of the connecting rods 55, the outer walls of the damping plates 56 and the connecting rods 55 are fixedly connected with the damping cylinders 5 and the inner walls of the through holes 54 respectively in a sliding mode, two ends of the second spring 57 are fixedly connected with one side, opposite to the two damping cylinders 5, of the second spring 57 respectively, the tops and the bottoms of the two damping cylinders 5 are fixedly connected with elastic telescopic rods 52, one ends, far away from the damping cylinders 5, of the elastic telescopic rods 52 are rotatably connected with balls 53, and the balls 53 are slidably connected with the guide grooves 11.
In this embodiment, can play the supporting role to backup pad 3 through last bracing piece 32 and lower bracing piece 21, after reciprocating vacuum pump 7 work produces vibrations, backup pad 3 can receive the pressure from vacuum pump mounting box 4, make backup pad 3 downwardly moving, make the distance between base 1 and the backup pad 3 reduce when backup pad 3 downwardly moving, thereby make the contained angle between upper bracing piece 32 and the lower bracing piece 21 reduce, the contained angle that makes upper connection plate 33 drive attenuator 34 downwardly moving and squeeze spring one 35, can carry out first step buffering shock attenuation to reciprocating vacuum pump 7 work produced vibration force, then pass through on articulated seat 51 with remaining vibration force through upper bracing piece 32 and transmit damping cylinder 5, make the distance between two damping cylinders 5 reduce when base 1 and backup pad 3 distance reduces, ball 53 on the damping cylinder 5 drives the flexible pole 52 and slides in guide way 11, and squeeze spring two 57, damping plate 56 slides in damping cylinder 5, thereby can cushion the residual vibration power, make this device have better buffering effect to the guide way, can be reached the shock attenuation effect to the guide way of pump that the vibration attenuation device has improved the guide effect of the vacuum pump, the vacuum pump has been realized through the guide effect that the guide effect of the vibration attenuation device has improved, the vacuum pump has achieved the effect of the vibration attenuation effect of the vacuum pump has been achieved through the guide effect of the vibration pump, can be achieved through the vacuum pump 11.
Example 3
As shown in fig. 1-4, on the basis of embodiment 1, the present utility model provides a technical solution: preferably, the vacuum pump mounting box 4 is fixedly connected with soundproof cotton 43 inside, and the inner wall of the heat dissipation hole 41 is fixedly connected with a dust screen 42.
In this embodiment, fresh air is pumped into the vacuum pump installation box 4 through the vent hole 44 by starting the heat dissipation fan 6 to work, so that the air is covered on the reciprocating vacuum pump 7, thereby achieving the heat dissipation effect, so that cold air can enter the vacuum pump installation box 4 through the vent hole 44, hot air is discharged through the heat dissipation hole 41, circulation of air is realized, flow of air in the vacuum pump installation box 4 is improved, the phenomenon that the reciprocating vacuum pump 7 is stopped due to temperature rise during working is reduced, the working effect of the reciprocating vacuum pump 7 is improved, normal production is prevented from being influenced, the dustproof effect can be achieved on the heat dissipation hole 41 through the dustproof net 42, and meanwhile, the soundproof cotton 43 can achieve the soundproof effect on noise generated during working of the reciprocating vacuum pump 7.
The working principle of the vibration damper of the reciprocating vacuum pump is specifically described below.
As shown in fig. 1 to 4, fresh air is pumped into the vacuum pump installation box 4 through the vent holes 44 by starting the heat dissipation fan 6 to enable the air to cover the reciprocating vacuum pump 7, thereby achieving the heat dissipation effect, so that cold air can enter the vacuum pump installation box 4 through the vent holes 44 and hot air is discharged through the heat dissipation holes 41, circulation of the air is realized, flow of the air in the vacuum pump installation box 4 is improved, phenomenon of shutdown caused by temperature rise when the reciprocating vacuum pump 7 works is reduced, working effect of the reciprocating vacuum pump 7 is improved, normal production is prevented from being influenced, dust prevention effect can be achieved on the heat dissipation holes 41 through the dustproof mesh 42, sound insulation effect can be achieved on noise generated when the reciprocating vacuum pump 7 works through the upper support rods 32 and the lower support rods 21, supporting effect can be achieved on the support plate 3, when the reciprocating vacuum pump 7 works to generate vibration, the supporting plate 3 receives the pressure from the vacuum pump installation box 4, so that the supporting plate 3 moves downwards, the distance between the base 1 and the supporting plate 3 is reduced when the supporting plate 3 moves downwards, the included angle between the upper supporting rod 32 and the lower supporting rod 21 is reduced, the upper connecting plate 33 drives the damper 34 to move downwards and compress the first spring 35, the vibration force generated by the operation of the reciprocating vacuum pump 7 can be buffered and damped in a first step, then the rest vibration force is transmitted to the damping cylinders 5 through the upper supporting rod 32, the distance between the base 1 and the supporting plate 3 is reduced, the distance between the two damping cylinders 5 is reduced, the damping cylinders 5 drive the balls 53 on the elastic telescopic rods 52 to slide in the guide grooves 11, and compress the second spring 57, the damping plate 56 slides in the damping cylinder 5 so as to buffer residual vibration force, so that the damping device has a good buffering and damping effect, can achieve a damping effect, improves the damping effect, solves the problem that the operation working condition of the vacuum pump is affected by vibration generated by working of the reciprocating vacuum pump 7, improves the using effect of the vacuum pump, and can play a role in guiding the balls 53 through the guide grooves 11.
The foregoing utility model has been generally described in great detail, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, it is intended to cover modifications or improvements within the spirit of the inventive concepts.
Claims (6)
1. The utility model provides a reciprocal vacuum pump damping device, includes base (1), its characterized in that: the top of base (1) is provided with backup pad (3), the top fixedly connected with vacuum pump mounting box (4) of backup pad (3), the bottom of backup pad (3) and the top of base (1) are fixedly connected with respectively and go up link (31) and link (2) down, guide way (11) have all been seted up to the bottom of backup pad (3) and the top of base (1), reciprocating vacuum pump (7) have been installed through mount pad (45) movable in the inside of vacuum pump mounting box (4), louvre (41) have all been seted up at both ends about vacuum pump mounting box (4);
the inner sides of the lower connecting frame (2) and the upper connecting frame (31) are respectively and rotatably connected with a lower supporting rod (21) and an upper supporting rod (32), the top of the base (1) is provided with two damping cylinders (5), two sides, away from each other, of the damping cylinders (5) are fixedly connected with a hinging seat (51), the upper surface of the lower supporting rod (21) is fixedly connected with a lower connecting plate (22), the lower surface of the upper supporting rod (32) is fixedly connected with an upper connecting plate (33), a damper (34) is movably installed between one ends, opposite to the upper connecting plate (33), of the lower connecting plate (22), a first spring (35) is sleeved outside the damper (34), a connecting rod (55) is arranged between one sides, opposite to the damping cylinders (5), of the two damping cylinders (55), and the outer wall of the connecting rod (55) is sleeved with a second spring (57);
The top of vacuum pump mounting box (4) has seted up ventilation hole (44), vacuum pump mounting box (4) top just is located the position movable mounting of ventilation hole (44) and has radiator fan (6).
2. The reciprocating vacuum pump vibration reducing apparatus of claim 1, wherein: the inner side of the hinge seat (51) is movably connected with the other ends of the upper supporting rod (32) and the lower supporting rod (21), and two ends of the first spring (35) are fixedly connected with the bottom of the upper connecting plate (33) and the top of the lower connecting plate (22) respectively.
3. The reciprocating vacuum pump vibration reducing apparatus of claim 1, wherein: through holes (54) are formed in one side, opposite to the two damping cylinders (5), of each damping cylinder, and damping plates (56) are fixedly connected to two ends of the connecting rod (55).
4. A reciprocating vacuum pump damping device according to claim 3, characterized in that: the outer walls of the damping plates (56) and the connecting rods (55) are respectively connected with the damping cylinders (5) and the inner walls of the through holes (54) in a sliding mode, and two ends of the second springs (57) are respectively fixedly connected with one sides, opposite to the two damping cylinders (5).
5. The reciprocating vacuum pump vibration reducing apparatus of claim 4, wherein: the top and the bottom of two damping section of thick bamboo (5) are all fixedly connected with elastic telescopic rod (52), the one end that damping section of thick bamboo (5) was kept away from to elastic telescopic rod (52) rotates and is connected with ball (53), ball (53) and guide way (11) sliding connection.
6. The reciprocating vacuum pump vibration reducing apparatus of claim 1, wherein: the inside fixedly connected with soundproof cotton (43) of vacuum pump mounting box (4), the inner wall fixedly connected with dust screen (42) of louvre (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322741463.0U CN221257040U (en) | 2023-10-12 | 2023-10-12 | Damping device of reciprocating vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322741463.0U CN221257040U (en) | 2023-10-12 | 2023-10-12 | Damping device of reciprocating vacuum pump |
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| Publication Number | Publication Date |
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| CN221257040U true CN221257040U (en) | 2024-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322741463.0U Active CN221257040U (en) | 2023-10-12 | 2023-10-12 | Damping device of reciprocating vacuum pump |
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| CN (1) | CN221257040U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118904135A (en) * | 2024-09-24 | 2024-11-08 | 浙江瑞迪新材料股份有限公司 | Real stone paint stirrer and driving method thereof |
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2023
- 2023-10-12 CN CN202322741463.0U patent/CN221257040U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118904135A (en) * | 2024-09-24 | 2024-11-08 | 浙江瑞迪新材料股份有限公司 | Real stone paint stirrer and driving method thereof |
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