Water-free vacuum sliding table for belt type vacuum filter

Abstract

The invention discloses a water-free vacuum sliding table for a belt type vacuum filter, and relates to the technical field of filters, the water-free vacuum sliding table comprises a table body, the middle of the upper end of the table body is provided with a middle groove, the lower end of the table body is provided with a plurality of negative pressure drainage ports communicated with the middle groove, and the two sides of the upper end face of the table body are provided with side grooves; an inverted-T-shaped inner groove strip block is arranged at the upper end of the side groove, a rubber pad is fixedly connected to the upper end face of the inverted-T-shaped inner groove strip block, and a plurality of evenly-distributed protruding strips are arranged on the upper end face of the rubber pad; the protruding strip can make contact with a filter belt during working to form multiple seals, the sealing effect is improved, meanwhile, the pushing assembly is arranged, the position of the table body can be regularly and finely adjusted during use, the contact position of the protruding strip and the filter belt can be changed after adjustment, the protruding strip rubs different positions of the filter belt of a filter, and the filter belt is prevented from being damaged. The wear is dispersed to a plurality of contact areas of the filter belt, and the wear rate of a single area is reduced.

Description

Technical Field

[0001] This invention relates to the field of filter technology, specifically to a waterless vacuum slide table for a belt vacuum filter. Background Technology

[0002] Belt vacuum filters, as highly efficient solid-liquid separation equipment, are widely used in various industrial fields such as chemical, mining, environmental protection, and food processing. Their core working principle is to use vacuum suction to separate the slurry on the filter belt into solid and liquid components, thereby forming a filter cake for subsequent processing. The vacuum slide is a key load-bearing and transmission component in the belt vacuum filter, directly connecting the vacuum system and the filter belt transmission mechanism. It not only needs to provide support for the smooth operation of the filter belt but also needs to ensure the airtightness of the vacuum environment to guarantee stable filtration efficiency.

[0003] Existing vacuum slides, such as the vacuum slide structure for a filter proposed in patent announcement number CN223351176U, include a slide body, a vacuum chamber in the middle of the slide body, a filter chamber and a discharge port below the vacuum chamber, and an installation area on the slide body; a floating plate is connected to the slide body by an elastic component, which helps to improve the sliding efficiency and smoothness of the sliding components, reduce frictional resistance, and improve sealing performance.

[0004] However, the aforementioned slide structure uses a fixed installation, meaning the contact friction area between the slide and the filter belt is relatively fixed. During long-term continuous operation, frictional wear will continuously occur at the fixed contact point between the filter belt and the slide, leading to rapid wear on the slide surface in that area. This also exacerbates wear on the corresponding filter belt section. When the wear reaches a certain level, it not only reduces the sealing performance between the slide and the filter belt but also causes premature failure of the slide or filter belt due to excessive wear at a single location, increasing equipment maintenance costs. Therefore, we provide a waterless vacuum slide for belt vacuum filters to solve the aforementioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide a waterless vacuum slide for a belt vacuum filter to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A waterless vacuum slide for a belt vacuum filter includes a platform body. The upper end of the platform body has a central groove, and the lower end of the platform body has several negative pressure drainage interfaces communicating with the central groove. Side grooves are opened on both sides of the upper end face of the platform body. The upper end of the side groove has a convex-shaped inner groove block. A rubber pad is fixedly connected to the upper end face of the convex-shaped inner groove block. The upper end face of the rubber pad has several evenly distributed protruding strips. The side groove is provided with a fixing component for fixing the convex-shaped inner groove block. Both sides of the platform are provided with mounting plates, and the upper end of each mounting plate is fixedly connected with a sliding sleeve. A sliding square rod is slidably connected inside each sliding sleeve. The sliding square rod is fixedly connected to the side of the platform. A pushing component is provided on the mounting plate, which is used to push the platform to move and adjust the lateral position of the protruding strip.

[0007] As a further aspect of the present invention: a number of support rollers are rotatably connected to the upper end of the intermediate groove.

[0008] As a further embodiment of the present invention: the fixing component includes an inner sliding frame, which is slidably connected to the side groove. The convex-shaped inner groove block is slidably connected to the slot at the upper end of the inner sliding frame. A plurality of hollow rotating rods are rotatably connected to the lower end of the inner sliding frame. The platform body is provided with avoidance holes for avoiding the hollow rotating rods. The hollow rotating rods pass through the avoidance holes. A spring is sleeved on the hollow rotating rods at the position between the inner sliding frame and the lower end face of the side groove. A handle is fixedly connected to the lower end of each hollow rotating rod. A locking component for locking the convex-shaped inner groove block is provided at the upper end of the hollow rotating rod.

[0009] As a further embodiment of the present invention: grooves are provided at the position where the upper end slot of the inner sliding frame contacts the convex inner groove block and at the positions where the two sides of the inner sliding frame contact the side grooves, and sealing strips are provided in the grooves.

[0010] As a further embodiment of the present invention: the locking assembly includes a threaded rod, which is threadedly connected to the upper end of a hollow rotating rod. A T-shaped square tube is fixedly connected to the upper end of the threaded rod. The T-shaped square tube is slidably connected to an inner sliding frame. Telescopic locking blocks are slidably connected to both sides of the T-shaped square tube. Side sliding grooves are provided on both sides of the upper horizontal portion of the T-shaped square tube. Slider blocks that are slidably connected to the side sliding grooves are fixedly connected to both sides of the telescopic locking blocks. Rollers are rotatably connected to the sliders. Tension springs are installed between the inner end face of the telescopic locking block and the middle partition of the horizontal portion of the T-shaped square tube. Inclined guide plates that cooperate with the rollers are fixedly connected to the upper end slot of the inner sliding frame at both ends of the T-shaped square tube.

[0011] As a further embodiment of the present invention: the pushing assembly includes a fixed sleeve, which is fixedly connected to both sides of one side of the platform. An inclined groove is provided on both sides of the fixed sleeve. A rotating seat is fixedly connected to each position of the mounting plate base corresponding to the fixed sleeve. A rotating shaft is rotatably connected inside each rotating seat. An inner rotating block is fixedly connected to one end of the rotating shaft near the fixed sleeve. The inner rotating block is rotatably connected inside the fixed sleeve. Sliding columns are fixedly connected to both sides of the inner rotating block, and the sliding columns are slidably connected to the inclined groove. A synchronization assembly is provided between the two rotating shafts to enable the two rotating shafts to rotate synchronously.

[0012] As a further embodiment of the present invention: the synchronization component includes a lever, which is fixedly connected to the end of the rotating shaft away from the fixed sleeve. The levers on the two rotating shafts are arranged in parallel, and a synchronization link is provided between the two levers. The two ends of the synchronization link are respectively rotatably connected to the middle of the lever.

[0013] As a further aspect of the present invention: the upper end of each sliding sleeve is threaded with a locking screw for locking the position of the sliding square rod.

[0014] As a further embodiment of the present invention: the intermediate groove is V-shaped, and the platform body is provided with cavities on both sides of the intermediate groove.

[0015] As a further aspect of the present invention: the handle edge is provided with a plurality of arc-shaped grooves, which are evenly distributed around the hollow rotating rod.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention features protruding strips that can form multiple seals with the filter belt during operation, improving the sealing effect. Simultaneously, the push-moving component allows for periodic fine-tuning of the platform's position during use. After adjustment, the contact position between the protruding strips and the filter belt changes, causing friction between the protruding strips and different parts of the filter belt. This disperses wear across multiple contact areas of the filter belt, significantly reducing the wear rate in any single area and thus greatly extending the overall service life of the vacuum slide and filter belt. It also avoids premature component failure due to excessive wear in a single location.

[0017] 2. The present invention, through the inner sliding frame, hollow rotating rod and locking component, can lock the convex inner groove strip during use, thereby fixing the convex inner groove strip. At the same time, the protruding strip can be replaced after excessive wear. When replacing, the locking component releases the locking of the convex inner groove strip, and then the convex inner groove strip, rubber pad and protruding strip can be removed as a whole for replacement. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the bottom structure of the present invention.

[0020] Figure 3 This is a cross-sectional structural diagram of the platform body in this invention.

[0021] Figure 4 In this invention Figure 3 A partial structural diagram.

[0022] Figure 5 This is a schematic diagram of the locking component in this invention.

[0023] Figure 6 This is a partial cross-sectional view of the T-shaped square tube in this invention.

[0024] Figure 7 This is a schematic diagram of a partially disassembled structure of the pushing component in this invention.

[0025] The components are as follows: 1. Platform; 2. Rotating shaft; 3. Synchronous connecting rod; 4. Actuating rod; 5. Sliding sleeve; 6. Sliding square rod; 7. Support roller; 8. Mounting plate base; 9. Rubber pad; 10. Inner rotating block; 11. Sliding column; 12. Fixed sleeve; 13. Inclined groove; 14. Hollow rotating rod; 15. Side groove; 16. Middle groove; 17. Spring; 18. Handle; 19. Protruding strip; 20. T-shaped square tube; 21. Inner sliding frame; 22. Locking screw; 23. T-shaped inner groove strip; 24. Roller; 25. Side sliding groove; 26. Threaded rod; 27. Inclined guide plate; 28. Telescopic locking block; 29. ​​Negative pressure drainage interface; 30. Tension spring; 31. Sealing strip; 32. Rotating seat. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1 In this embodiment of the invention, an anhydrous vacuum slide for a belt vacuum filter includes a platform body 1. A central groove 16 is provided at the middle of the upper end of the platform body 1. A plurality of support rollers 7 are rotatably connected to the upper end of the central groove 16. The support rollers 7 are used to support the filter belt of the filter machine and prevent the filter belt from collapsing under negative pressure.

[0028] Please see Figures 2-4The lower end of the platform 1 is provided with several negative pressure drainage interfaces 29 that communicate with the intermediate groove 16. Side grooves 15 are provided on both sides of the upper surface of the platform 1. A U-shaped inner groove block 23 is provided at the upper end of each side groove 15. A rubber pad 9 is fixedly connected to the upper surface of the U-shaped inner groove block 23. Several evenly distributed protruding strips 19 are provided on the upper surface of the rubber pad 9. A fixing component for fixing the U-shaped inner groove block 23 is provided inside the side groove 15. The fixing component includes an inner sliding frame 21, which is slidably connected inside the side groove 15. The U-shaped inner groove block 23 is slidably connected to the groove at the upper end of the inner sliding frame 21. Several hollow rotating rods 14 are rotatably connected to the lower end of the inner sliding frame 21. Avoidance holes for avoiding the hollow rotating rods 14 are provided inside the platform 1. The hollow rotating rods 14 pass through the avoidance holes. A spring 17 is fitted onto the hollow rotating rod 14 located between the inner sliding frame 21 and the lower end face of the side groove 15. A handle 18 is fixedly connected to the lower end of each hollow rotating rod 14. A locking assembly is provided at the upper end of the hollow rotating rod 14 to lock the U-shaped inner groove strip 23. Through the inner sliding frame 21, hollow rotating rod 14, and locking assembly, the U-shaped inner groove strip 23 can be locked during use, thus securing it. Simultaneously, the protruding strip 19 can be replaced after excessive wear. During replacement, the locking assembly releases the lock on the U-shaped inner groove strip 23, allowing the U-shaped inner groove strip 23, rubber pad 9, and protruding strip 19 to be removed and replaced as a whole. The spring 17 applies elastic force to the inner sliding frame 21, ensuring that the protruding strip 19 fits tightly against the filter belt of the filter press, guaranteeing a seal.

[0029] The handle 18 has several arc-shaped grooves on its edge, which are evenly distributed around the hollow rotating rod 14. The arc-shaped grooves make it easier to hold and increase the friction when holding.

[0030] Please see Figures 5-6The locking assembly includes a threaded rod 26, which is threadedly connected to the upper end of a hollow rotating rod 14. A T-shaped square tube 20 is fixedly connected to the upper end of the threaded rod 26. The T-shaped square tube 20 is slidably connected to an inner sliding frame 21. Telescopic locking blocks 28 are slidably connected to both sides of the T-shaped square tube 20. Side sliding grooves 25 are provided on both sides of the upper horizontal portion of the T-shaped square tube 20. Slider blocks that are slidably connected to the side sliding grooves 25 are fixedly connected to both sides of the telescopic locking blocks 28. Rollers 24 are rotatably connected to the sliders. Tension springs 30 are installed between the inner end face of the telescopic locking blocks 28 and the middle partition of the horizontal portion of the T-shaped square tube 20. Inclined guide plates 27 that cooperate with the rollers 24 are fixedly connected to the upper end slot of the inner sliding frame 21 at both ends of the T-shaped square tube 20. When it is necessary to lock the convex inner groove block 23, the hollow rotating rod 14 is rotated by the handle 18. The rotation of the hollow rotating rod 14 can engage the threaded rod 23. Rod 26 moves the T-shaped square tube 20 downwards. This downward movement causes roller 24 to contact the inclined surface of guide plate 27. Under the influence of the inclined surface, roller 24 moves towards the end of the T-shaped square tube 20, causing telescopic locking block 28 to extend. As the T-shaped square tube 20 moves downwards, telescopic locking block 28 presses down on the horizontal part of the lower end of the convex inner groove block 23, thus locking the convex inner groove block 23. When it is necessary to release the locking of the convex inner groove... When the strip 23 is locked, the hollow rotating rod 14 is rotated in the opposite direction by the handle 18, so that the T-shaped square tube 20 moves upward. When the T-shaped square tube 20 moves upward, the roller 24 gradually disengages from the inclined guide plate 27. The telescopic locking block 28 will retract into the T-shaped square tube 20 under the action of the tension spring 30. After the telescopic locking block 28 retracts into the T-shaped square tube 20, it releases the lock on the convex inner groove strip 23, and then the convex inner groove strip 23 can be taken out from the groove of the inner slide frame 21.

[0031] Please see Figure 4 The inner sliding frame 21 has grooves at the position where the upper groove of the inner sliding frame 21 contacts the convex inner groove block 23 and at the positions where the two sides of the inner sliding frame 21 contact the side groove 15. Each groove has a sealing strip 31. The sealing strip 31 is used to seal.

[0032] Please see Figure 1 and Figure 7The platform 1 has mounting bases 8 on both sides, with mounting holes at both ends. The mounting bases 8 are used to fix the platform 1 to the filter frame. A sliding sleeve 5 is fixedly connected to the upper end of each mounting base 8, and a sliding square rod 6 is slidably connected inside each sliding sleeve 5. The sliding square rod 6 is fixedly connected to the side of the platform 1. A pushing assembly is provided on the mounting base 8 to move the platform 1 and adjust the lateral position of the protruding strip 19. The pushing assembly includes a fixed sleeve 12, which is fixedly connected to both sides of one side of the platform 1. Inclined grooves 13 are provided on both sides of the fixed sleeve 12. A rotating seat 32 is fixedly connected to each mounting base 8 at a position corresponding to the fixed sleeve 12. A rotating shaft 2 is rotatably connected inside each rotating seat 32. An inner rotating block 10 is fixedly connected to the end of the rotating shaft 2 near the fixed sleeve 12. The inner rotating block 10 is rotatably connected inside the fixed sleeve 12. Sliding columns 11 are fixedly connected to both sides, and the sliding columns 11 are slidably connected to the inclined groove 13. A synchronization component is provided between the two rotating shafts 2 to make the two rotating shafts 2 rotate synchronously. The upper end of the sliding sleeve 5 is threaded with a locking screw 22 for locking the position of the sliding square rod 6. When it is necessary to push the platform 1 to adjust the lateral position of the protruding strip 19, the rotating shaft 2 can be rotated through the synchronization component. The rotation of the rotating shaft 2 can drive the inner rotating block 10 to rotate. The sliding column 11 rotates with the inner rotating block 10 and moves in the inclined groove 13. Then, under the action of the inclined groove 13, the platform 1 moves, thereby changing the friction position between the protruding strip 19 and the filter belt. After the position of the protruding strip 19 is adjusted, the sliding square rod 6 is locked with the locking screw 22 to lock the position of the platform 1. This allows the protruding strip 19 to rub against different positions of the filter belt during application, dispersing the wear to multiple contact areas of the filter belt and reducing the wear rate of a single area.

[0033] Please see Figure 1 The synchronization component includes a lever 4, which is fixedly connected to the end of the rotating shaft 2 away from the fixed sleeve 12. The levers 4 on the two rotating shafts 2 are arranged in parallel, and a synchronization link 3 is provided between the two levers 4. The two ends of the synchronization link 3 are respectively rotatably connected to the middle of the lever 4. When it is necessary to rotate the rotating shaft 2, one of the levers 4 can be moved to drive the rotating shaft 2 to rotate. Since the two levers 4 are synchronously linked by the synchronization link 3, the two rotating shafts 2 can rotate synchronously.

[0034] The intermediate groove 16 is V-shaped, and the platform 1 has cavities on both sides of the intermediate groove 16.

[0035] The working principle of this invention is as follows: During operation, the mounting plate base 8 is first installed on the filter machine, and the protruding strip 19 is made to fit tightly against the filter belt of the filter machine. The support roller 7 is used to support the filter belt of the filter machine to prevent the filter belt from collapsing under negative pressure. The water filtered by the filter machine enters the intermediate trough 16 through the gap of the support roller 7, and then is discharged from the negative pressure drain port 29. When it is necessary to push the platform 1 to adjust the lateral position of the protruding strip 19, the rotating shaft 2 can be rotated through the synchronization component. The rotation of the rotating shaft 2 can drive the inner rotation. When block 10 rotates, sliding column 11 rotates together with inner rotating block 10 and moves within inclined groove 13. Under the action of inclined groove 13, platform 1 moves along sliding square rod 6, thereby changing the friction position between protruding strip 19 and filter belt. After the position of protruding strip 19 is adjusted, locking screw 22 is used to lock sliding square rod 6 to lock the position of platform 1. This allows protruding strip 19 to rub against different positions of filter belt during application, dispersing wear to multiple contact areas of filter belt and reducing the wear rate of a single area.

[0036] The inner sliding frame 21, hollow rotating rod 14, and locking assembly can lock the convex inner groove block 23 during use, thus fixing the convex inner groove block 23. At the same time, the protruding strip 19 can be replaced after excessive wear. When replacing, the locking assembly releases the locking of the convex inner groove block 23, and then the convex inner groove block 23, rubber pad 9, and protruding strip 19 can be removed as a whole for replacement.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Although this specification describes embodiments, not every embodiment contains only one technical solution. This method of description is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waterless vacuum slide for a belt vacuum filter, comprising a table body (1), characterized in that: The upper end of the table body (1) is provided with an intermediate groove (16), and the lower end of the table body (1) is provided with a plurality of negative pressure drainage interfaces (29) communicated with the intermediate groove (16), the upper end surface of the table body (1) is provided with a side groove (15) on each side, the upper end of the side groove (15) is provided with a convex-shaped inner groove strip block (23), the upper end surface of the convex-shaped inner groove strip block (23) is fixedly connected with a rubber pad (9), the upper end surface of the rubber pad (9) is provided with a plurality of evenly distributed protruding strips (19), and the side groove (15) is provided with a fixing assembly for fixing the convex-shaped inner groove strip block (23). The table body (1) is provided with a mounting plate seat (8) on each side, the upper end of the mounting plate seat (8) is fixedly connected with a sliding sleeve (5), the sliding sleeve (5) is slidably connected with a sliding square rod (6) inside, the sliding square rod (6) is fixedly connected with the side surface of the table body (1), and the mounting plate seat (8) is provided with a pushing assembly for pushing the table body (1) to move and adjust the transverse position of the protruding strip (19).

2. A waterless vacuum slide for a belt vacuum filter according to claim 1, characterized in that The upper end of the intermediate groove (16) is rotatably connected with a plurality of supporting rollers (7).

3. A waterless vacuum slide for a belt vacuum filter according to claim 1, characterized in that The fixing assembly comprises an inner sliding frame (21), the inner sliding frame (21) is slidably connected in the side groove (15), the convex-shaped inner groove strip block (23) is slidably connected in the notch at the upper end of the inner sliding frame (21), the lower end of the inner sliding frame (21) is rotatably connected with a plurality of hollow rotating rods (14), the table body (1) is provided with an avoidance hole for avoiding the hollow rotating rod (14), the hollow rotating rod (14) is arranged in the avoidance hole, the hollow rotating rod (14) is sleeved with a spring (17) at a position between the inner sliding frame (21) and the lower end surface of the side groove (15), the lower end of the hollow rotating rod (14) is fixedly connected with a handle (18), and the upper end of the hollow rotating rod (14) is provided with a locking assembly for locking the convex-shaped inner groove strip block (23).

4. A waterless vacuum slide for a belt vacuum filter according to claim 3, characterized in that The upper end notch of the inner sliding frame (21) and the positions, where the inner sliding frame (21) is in contact with the side groove (15) on both sides, are all provided with wire grooves, and the wire grooves are all provided with sealing strips (31).

5. A waterless vacuum slide for a belt vacuum filter according to claim 4, characterized in that The locking assembly comprises a threaded rod (26), the threaded rod (26) is threadedly connected at the upper end of the hollow rotating rod (14), the upper end of the threaded rod (26) is fixedly connected with a T-shaped square tube (20), the T-shaped square tube (20) is slidably connected with the inner sliding frame (21), the T-shaped square tube (20) is slidably connected with telescopic locking blocks (28) on both sides, the T-shaped square tube (20) is provided with side sliding grooves (25) on both sides of the horizontal part of the upper end, the telescopic locking blocks (28) are fixedly connected with sliding blocks slidably connected with the side sliding grooves (25) on both sides, the sliding blocks are rotatably connected with rollers (24), the inner end surface of the telescopic locking block (28) and the middle partition plate between the T-shaped square tube (20) are both provided with tension springs (30), and the upper end notches of the inner sliding frame (21) are fixedly connected with inclined guide plates (27) matched with the rollers (24) at positions on both ends of the T-shaped square tube (20).

6. A waterless vacuum slide for a belt vacuum filter according to claim 1, characterized in that The push-moving assembly comprises a fixing sleeve (12) fixedly connected at positions on both sides of one side surface of the table body (1), and slant grooves (13) are formed on both sides of the fixing sleeve (12); the mounting plate seat (8) and the fixing sleeve (12) are fixedly connected at corresponding positions, and rotating seats (32) are fixedly connected in the mounting plate seat (8) and the fixing sleeve (12); rotating shafts (2) are rotatably connected in the rotating seats (32); the rotating shafts (2) are fixedly connected with inner rotating blocks (10) at one end close to the fixing sleeve (12); the inner rotating blocks (10) are rotatably connected in the fixing sleeve (12); the inner rotating blocks (10) are fixedly connected with sliding columns (11) at both sides; the sliding columns (11) are slidably connected with the slant grooves (13); a synchronous assembly is arranged between the two rotating shafts (2) and is used for synchronously rotating the two rotating shafts (2).

7. A waterless vacuum slide for a belt vacuum filter according to claim 6, characterized in that The synchronous assembly comprises a pulling lever (4) fixedly connected at one end of the rotating shaft (2) away from the fixing sleeve (12); the pulling levers (4) on the two rotating shafts (2) are arranged in parallel; and a synchronous connecting rod (3) is arranged between the two pulling levers (4) and rotatably connected with the pulling levers (4) at both ends.

8. A waterless vacuum slide for a belt vacuum filter according to claim 7, characterized in that The sliding sleeves (5) are threadedly connected with locking screws (22) at upper ends of the sliding sleeves (5) and used for locking positions of the sliding square rods (6).

9. A waterless vacuum slide for a belt vacuum filter according to claim 1, characterized in that The table body (1) is arranged at positions on both sides of the middle groove (16) and provided with cavities.

10. A waterless vacuum slide for a belt vacuum filter according to claim 3, characterized in that The handle (18) is provided with a plurality of arc grooves arranged uniformly around the hollow rotating rod (14).

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