High-strength stable connecting piece for ultrahigh-pressure rubber hose

Abstract

The invention relates to the technical field of rubber tube connecting pieces, and provides an ultrahigh-pressure rubber tube high-strength stable type connecting piece which comprises a butt-clamp type connecting mechanism, a butt-joint piece and a rubber layer protection mechanism, the butt-clamp type connecting mechanism is detachably connected with a threaded connector and a threaded sleeve connector, and two rubber tubes can be connected through the butt-clamp type connecting mechanism; the butt clamp type connecting mechanism is used for protecting the connecting position of the two rubber pipes, the threaded connector and the threaded sleeve connector can be detachably connected with the butt joint piece, and when the threaded connector and the threaded sleeve connector are not connected with the butt joint piece, the rubber layer protecting mechanism makes contact with sealing rubber layers on the surfaces of the rubber pipes. By means of the technical scheme, the problems that in the prior art, when an ultrahigh-pressure rubber pipe is used, a connector may crack or extrude the sealing rubber layer of the rubber pipe due to the fact that the pressure is too high, and the stability of the rubber pipe is affected are solved.

Description

Technical Field

[0001] This invention relates to the field of hose connector technology, specifically to a high-strength and stable connector for ultra-high pressure hoses. Background Technology

[0002] Ultra-high pressure hoses are designed for higher working pressures. They can typically operate over a wider temperature range and have stronger pressure resistance and sealing performance compared to ordinary hoses. Ultra-high pressure hoses are used in many large hydraulic systems and industrial applications requiring high-pressure water injection.

[0003] Ultra-high pressure hoses typically have connectors at both ends, which connect to metal wires inside the hose. The two hoses can be connected by threads. In actual use, due to the high pressure inside the hose, there is a risk of disconnection if the pressure fluctuates or the connection is unstable. Additionally, in the field, the hose may bend as the equipment moves, and the part of the connector wrapped around the hose may compress the sealing layer on the hose surface when the hose is bent, potentially damaging the hose's seal. Therefore, to ensure the stability of the connection when using ultra-high pressure hoses, a high-strength and highly stable connector is required. Summary of the Invention

[0004] This invention proposes a high-strength and stable connector for ultra-high pressure hoses, which solves the problem that in the prior art, the joints of ultra-high pressure hoses may crack due to excessive pressure or be squeezed by the hose sealing layer, thus affecting the stability of the hose.

[0005] The technical solution of the present invention is as follows:

[0006] A high-strength and stable connector for ultra-high pressure hoses includes a hose, a threaded connector, and a threaded sleeve connector. The threaded connector and the threaded sleeve connector are respectively fixedly installed on two hoses. The connector also includes a clamp-type connection mechanism, a mating part, and a rubber layer protection mechanism. The clamp-type connection mechanism is detachably connected to the threaded connector and the threaded sleeve connector. The two hoses can be connected through the clamp-type connection mechanism, which protects the connection point of the two hoses. The mating part is detachably disposed in the clamp-type connection mechanism. Both the threaded connector and the threaded sleeve connector can be detachably connected to the mating part. When neither the threaded connector nor the threaded sleeve connector is connected to the mating part, both ends of the mating part are in contact with the threaded connector and the threaded sleeve connector, respectively. The rubber layer protection mechanism is fixedly connected to both ends of the clamp-type connection mechanism and is in contact with the sealing rubber layer on the surface of the hose. The rubber layer protection mechanism protects the sealing rubber layer when the hose is bent.

[0007] The two ends of the mating part are respectively fixedly connected to a threaded end and a threaded sleeve end. The threaded end can be detachably connected to the threaded sleeve joint, and the threaded sleeve end can be detachably connected to the threaded joint.

[0008] The clamp-type connection mechanism includes a clamping shell, a first mating cavity, a second mating cavity, and a sealing gasket mechanism. Two clamping shells are provided and detachably connected. Each clamping shell has a mating groove, and the mating component is detachably connected to the mating groove. The first mating cavity is located within the clamping shell, and the threaded connector is detachably located within it. The second mating cavity is also located within the clamping shell, and the threaded connector is detachably located within it. The first and second mating cavities are respectively located on opposite sides of the mating groove. The sealing gasket mechanism is located within both the first and second mating cavities and is used for sealing within them.

[0009] When the threaded end is mated with the threaded sleeve, and the threaded sleeve is mated with the threaded connector, the threaded end and the threaded sleeve are respectively located in mating cavity one and mating cavity two. When the threaded end abuts against the threaded connector, and the threaded sleeve abuts against the threaded connector, the threaded end and the threaded sleeve are respectively located in mating cavity two and mating cavity one.

[0010] The sealing gasket mechanism includes a first sealing groove, a first sealing ring, a second sealing groove, and a second sealing ring. Two first sealing grooves are provided, each located within the first mating cavity. The two first sealing grooves are positioned near and away from the first mating groove, respectively. A first sealing ring is detachably disposed within the first sealing groove and can contact the threaded connector and the threaded end. Two second sealing grooves are provided, each located within the second mating cavity. The two second sealing grooves are positioned near and away from the second mating cavity, respectively. A second sealing ring is detachably disposed within the second sealing groove and can contact the threaded connector and the threaded end.

[0011] When the threaded sleeve end and the threaded joint abut against each other, the first sealing ring is detachably disposed in the first sealing groove near the mating groove. At this time, the first sealing ring is disposed between the threaded sleeve end and the threaded joint. When the threaded end and the threaded joint abut against each other, the second sealing ring is detachably disposed in the second sealing groove near the mating groove. At this time, the second sealing ring is disposed between the threaded end and the threaded joint.

[0012] The adhesive layer protection mechanism includes an arc-shaped pressure plate, an arc-shaped clamp, and a tightening nut. Multiple arc-shaped pressure plates are provided, respectively located at both ends of the clamping housing. The multiple arc-shaped pressure plates are arranged in a circle. The arc-shaped pressure plates are provided with threads. The arc-shaped clamp is fixedly connected to the end of the arc-shaped pressure plate away from the clamping housing. The arc-shaped clamp can contact the adhesive tube. The tightening nut is sleeved on the adhesive tube and is threadedly connected to the threads on the arc-shaped pressure plate.

[0013] When the two clamping shells are brought together, the plurality of arc-shaped pressure plates form a circle. When the arc-shaped clamp is threadedly connected to the arc-shaped pressure plate, the arc-shaped clamps on the plurality of arc-shaped pressure plates press the tubing tightly.

[0014] The working principle and beneficial effects of this invention are as follows:

[0015] 1. In this invention, by setting a clamp-type connecting mechanism, the threaded joint and the threaded sleeve joint are set in it. On the one hand, it avoids the situation where the two hoses pop apart when the connection is broken during use. On the other hand, the clamp-type connecting mechanism clamps and fixes the threaded joint and the threaded sleeve joint. The internal groove can also fix the threaded joint and the threaded sleeve joint during clamping, which also increases the stability of the docking position.

[0016] 2. In this invention, by setting a mating part, when the threaded joint and the threaded sleeve joint can be connected normally, they can be connected to the mating part and fixed in the clamp-type connection mechanism. When the threaded joint and the threaded sleeve joint cannot be connected normally, the threaded joint and the threaded sleeve joint can be pressed and fixed by flipping the mating part, while maintaining a seal.

[0017] 3. In this invention, by setting a clamp-type connection mechanism, the connection between the two rubber tubes is protected by external wrapping. On the one hand, the clamping improves stability, and on the other hand, it reduces the damage caused by the breakage of the connection. By setting a rubber layer protection mechanism to wrap the rubber tube, the arc-shaped part is used for support when the rubber tube is bent, so as to avoid damage to the sealing rubber layer on the surface of the rubber tube. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the threaded connector and threaded sleeve end in this invention, which are fitted with the clamping housing when they are threaded together.

[0021] Figure 3This is a schematic diagram of the structure of the threaded connector and the threaded end in contact with the clamping housing in this invention;

[0022] Figure 4 This is a schematic diagram of the phase structure inside the clamping shell in this invention;

[0023] Figure 5 In this invention Figure 2 A schematic diagram showing the exploded structure of the rubber hose and connectors.

[0024] Figure 6 In this invention Figure 3 An exploded view of the assembly of the rubber hose and the connector.

[0025] In the diagram: 1. Rubber hose; 2. Threaded connector; 3. Threaded sleeve connector; 4. Connecting part; 5. Threaded end; 6. Threaded sleeve end; 7. Clamping shell; 8. Connecting groove; 9. Connecting cavity one; 10. Connecting cavity two; 11. Sealing groove one; 12. Sealing ring one; 13. Sealing groove two; 14. Sealing ring two; 15. Arc-shaped pressure plate; 16. Arc-shaped clamp; 17. Tightening nut. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figures 1-6As shown, this embodiment proposes a high-strength and stable connector for ultra-high pressure hoses, including a hose 1, a threaded connector 2, and a threaded sleeve connector 3. The threaded connector 2 and the threaded sleeve connector 3 are respectively fixedly installed on two hoses 1. It also includes a clamp-type connection mechanism, a mating part 4, and a rubber layer protection mechanism. The clamp-type connection mechanism is detachably connected to the threaded connector 2 and the threaded sleeve connector 3. The two hoses 1 can be connected through the clamp-type connection mechanism, which protects the connection point of the two hoses 1. The mating part 4 is detachably disposed in the clamp-type connection mechanism. Both the threaded connector 2 and the threaded sleeve connector 3 can be detachably connected to the mating part 4. When neither the threaded connector 2 nor the threaded sleeve connector 3 is connected to the mating part 4, both ends of the mating part 4 are in contact with the threaded connector 2 and the threaded sleeve connector 3, respectively. The rubber layer protection mechanism is fixedly connected to both ends of the clamp-type connection mechanism and is in contact with the sealing rubber layer on the surface of the hose 1. This device is used to protect the sealing layer when the hose 1 is bent. Traditionally, the ultra-high pressure hose 1 is connected by a threaded connector 2 and a threaded sleeve connector 3. Gaskets or other sealing structures in the threaded connector 2 and threaded sleeve connector 3 prevent liquid leakage. The ends are connected by threads to extend the ultra-high pressure hose 1. However, with the traditional connection method, the connection between the threaded connector 2 and threaded sleeve connector 3 may break when the pressure is too high or the connection is unstable, which may cause pressure leakage and potentially cause injury. By connecting the two hoses 1 with a clamp-type connection mechanism, when liquid leakage occurs, on the one hand, the clamp-type connection mechanism can prevent the two ends of the hose 1 from springing apart, and on the other hand, it can keep the two hoses 1 connected, reducing the possibility of sudden pressure drop. At the same time, the sealing layer protection mechanism provides support to the curved surface when the hose 1 is bent, preventing damage to the sealing layer on the surface of the hose 1.

[0028] like Figures 1-6 As shown, threaded end 5 and threaded sleeve end 6 are fixedly connected to both ends of the docking part 4, respectively. Threaded end 5 can be detachably connected to threaded sleeve 3, and threaded sleeve end 6 can be detachably connected to threaded joint 2. Threaded end 5 and threaded sleeve end 5 can be used to connect two rubber tubes 1 to docking part 4. Since docking part 4 can be aligned with docking groove 8 in clamping housing, the two rubber tubes 1 can be fixed in position in clamping housing.

[0029] like Figures 1-6As shown, the clamping connection mechanism includes a clamping housing 7, a first mating cavity 9, a second mating cavity 10, and a sealing gasket mechanism. Two clamping housings 7 are provided and detachably connected. A mating groove 8 is formed in each clamping housing 7, and the mating component 4 is detachably connected to the groove 8. The first mating cavity 9 is located within the clamping housing 7, and a threaded connector 3 is detachably disposed within it. The second mating cavity 10 is located within the clamping housing 7, and a threaded connector 2 is detachably disposed within it. The first and second mating cavities 9 and 10 are respectively located on opposite sides of the groove 8. The sealing gasket mechanism is disposed within both the first and second mating cavities 9 and 10, and is used for sealing within them. The clamping housing is boat-shaped, and the two clamping housings 7 are mated together and fixed with bolts, allowing the mating component to be... 4, along with bolt joints and bolt sleeves, are enclosed within the outer shell, which protects against external contact and prevents instability at the joint due to external contact. Simultaneously, the mating part 4 can be reversed within the clamping shell 7. The threaded end 5 is the same size as the threaded joint 2, and the threaded sleeve end 6 is the same size as the threaded sleeve joint 3. This reversed arrangement allows the mating part 4 to support the threaded joints 2 and threaded sleeve joints 3 of the two hoses 1, ensuring that the threaded sleeve joint 3 is tightly fitted to the first mating cavity 9, and the threaded joint 2 is tightly fitted to the second mating cavity 10, increasing stability. When the threaded joints 2 and threaded sleeve joint 3 malfunction and cannot be threaded, the mating part 4 can be flipped for installation. It can also be used for quick reconnection when the hose 1 connection is broken, avoiding the tedious process of replacing the hose 1.

[0030] like Figures 2-3 As shown, when threaded end 5 mates with threaded sleeve 3 and threaded sleeve end 6 mates with threaded joint 2, threaded end 5 and threaded sleeve end 6 are respectively located in mating cavity 1 9 and mating cavity 2 10. When threaded end 5 abuts against threaded joint 2 and threaded sleeve end 6 abuts against threaded sleeve 3, threaded end 5 and threaded sleeve end 6 are respectively located in mating cavity 2 10 and mating cavity 1 9.

[0031] like Figures 2-6As shown, the sealing gasket mechanism includes a first sealing groove 11, a first sealing ring 12, a second sealing groove 13, and a second sealing ring 14. Two first sealing grooves 11 are provided, both located within the first mating cavity 9, positioned near and away from the second mating groove 8, respectively. The first sealing ring 12 is detachably disposed within the first sealing groove 11 and can contact the threaded sleeve 3 and the threaded sleeve end 6. Two second sealing grooves 13 are provided, both located within the second mating cavity 10. 13 are respectively positioned in the second mating cavity 10 near and away from the mating groove 8. A second sealing ring 14 is detachably mounted in the second sealing groove 13, capable of contacting the threaded connector 2 and the threaded end 5. When the threaded sleeve end 6 and the threaded sleeve connector 3 abut, a first sealing ring 12 is detachably mounted in the first sealing groove 11 near the mating groove 8, at which point the first sealing ring 12 is positioned between the threaded sleeve end 6 and the threaded sleeve connector 3. When the threaded end 5 and the threaded connector 2 abut, a second sealing ring 14 is detachably mounted in the second sealing groove 13 near the mating groove 8. Sealing ring 12 is positioned between threaded end 5 and threaded connector 2. When threaded connector 3 and threaded end 6 are in contact, sealing ring 12 provides a seal between them. Simultaneously, sealing ring 14 is positioned between threaded connector 2 and threaded end 5. When threaded connector 2 and threaded end 5 are in contact, sealing ring 14 provides a seal between them. The combination of sealing ring 14 and sealing ring 12 prevents leakage when threaded connector 2 and threaded connector 3 are not connected by threads. Furthermore, when the threaded collet and threaded sleeve 3 are connected to the mating part 4 by threads, sealing ring 12 is fitted on the threaded sleeve 3 and sealing ring 24 is fitted on the threaded joint 2. When the connection with the mating part 4 breaks, the threaded joint 2 and the threaded sleeve 3 will move away from the mating part 4 under the pressure of the liquid. At this time, the threaded sleeve 3 will accumulate on the sealing ring 12 and the threaded joint 2 will accumulate on the sealing ring 24, thus sealing the mating cavity 19 and the mating cavity 20, reducing the liquid sprayed out when the mating point is unstable and disconnected, and reducing the losses caused.

[0032] like Figures 1-3As shown, the adhesive layer protection mechanism includes an arc-shaped pressure plate 15, an arc-shaped clamp 16, and a tightening nut 17. Multiple arc-shaped pressure plates 15 are provided, respectively located at both ends of the clamping housing 7. The multiple arc-shaped pressure plates 15 are arranged in a circle, and each arc-shaped pressure plate 15 has a thread. The arc-shaped clamp 16 is fixedly connected to the end of the arc-shaped pressure plate 15 away from the clamping housing 7, and the arc-shaped clamp 16 can contact the adhesive tube 1. The tightening nut 17 is sleeved on the adhesive tube 1, and the tightening nut 17 is threadedly connected to the thread on the arc-shaped pressure plate 15. When two clamping housings 7 are in contact, the multiple arc-shaped pressure plates 15 form a circle. When the arc-shaped clamp 16 is in contact with the arc-shaped pressure plate 15, the multiple arc-shaped pressure plates 15 form a circle. 5. When the threaded connection is made, the arc-shaped clamps 16 on the multiple arc-shaped pressure plates 15 press the hose 1 tightly. Three arc-shaped pressure plates 15 are provided at both ends of each clamping housing 7. When two clamping housings 7 are connected, the six arc-shaped pressure plates 15 form a circle. The threads on the arc-shaped pressure plates 15 are set at an angle. When the tightening nut 17 is sleeved on the six arc-shaped pressure plates 15, the arc-shaped pressure plates 15 are tilted towards the hose 1 by tightening the nut 17 until the arc-shaped clamps 16 clamp the hose 1. When the hose 1 bends, it will bend at the contact position with the arc-shaped clamps 16, which can avoid the threaded joint 2 or the threaded sleeve joint 3 from squeezing the sealing adhesive layer.

[0033] In this embodiment, a fixed connection is achieved by using a connector sleeved on the outside of the threaded joint 2 and the threaded sleeve joint 3. Compared with traditional connection methods, this avoids external influences and improves the stability of the connection. Furthermore, it prevents serious accidents in the event of a malfunction or disconnection. During use, the threaded joint 2 and the threaded sleeve joint 3 are respectively connected to the threaded sleeve end 6 and the threaded end 5 on both sides of the mating piece 4. The two hoses 1 are connected through the mating piece 4, which is fixed in the mating groove 8. The two hoses 1 are then fixed in the clamping housing 7. If the threaded joint 2 and the threaded sleeve joint 3 malfunction, or if the connection has already been disconnected and a malfunction has occurred, the connection can be corrected by... The connector 4 is flipped and placed in the clamping housing 7 for fixation. The threaded sleeve end 6 presses against the threaded sleeve 3 and the threaded end 5 presses against the threaded connector 2. At the same time, the sealing ring 12 and sealing ring 14 are clamped at the joint for sealing. Before the threaded connector 2 and the threaded sleeve 3 are connected to the clamping housing 7, the tightening nut 17 is first put on the hose 1. After the two clamping housings 7 are connected and fixed with bolts, the tightening bolt is threaded to the arc-shaped pressure plate 15. During the rotation of the tightening nut 17, the arc-shaped pressure plate 15 gradually bends until the arc-shaped clamp 16 contacts the hose 1. When the hose 1 bends and contacts the arc-shaped clamp 16, the sealing rubber layer on the surface of the hose 1 can be prevented from being damaged.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-strength and stable connector for ultra-high pressure hoses, comprising a hose (1), a threaded connector (2), and a threaded sleeve connector (3), wherein the threaded connector (2) and the threaded sleeve connector (3) are respectively fixedly installed on two hoses (1), characterized in that, Also includes: The clamp-type connection mechanism is detachably connected to the threaded connector (2) and the threaded sleeve connector (3). The two hoses (1) can be connected through the clamp-type connection mechanism, which is used to protect the connection point of the two hoses (1). The mating part (4) is detachably disposed in the clamp-type connection mechanism. The threaded joint (2) and the threaded sleeve joint (3) can be detachably connected to the mating part (4). When neither the threaded joint (2) nor the threaded sleeve joint (3) is connected to the mating part (4), both ends of the mating part (4) are in contact with the threaded joint (2) and the threaded sleeve joint (3) respectively. The adhesive layer protection mechanism is fixedly connected to both ends of the clamp-type connection mechanism. The adhesive layer protection mechanism is in contact with the sealing adhesive layer on the surface of the tubing (1). The adhesive layer protection mechanism is used to protect the sealing adhesive layer when the tubing (1) is bent.

2. The high-strength and stable connector for ultra-high pressure hoses according to claim 1, characterized in that, The two ends of the docking part (4) are respectively fixedly connected to a threaded end (5) and a threaded sleeve end (6). The threaded end (5) can be detachably connected to the threaded sleeve joint (3), and the threaded sleeve end (6) can be detachably connected to the threaded joint (2).

3. The high-strength and stable connector for ultra-high pressure hoses according to claim 2, characterized in that, The clamp-type connecting mechanism includes: Two clamping shells (7) are provided, and the two clamping shells (7) are detachably connected. A mating groove (8) is provided in the clamping shell (7), and the mating part (4) is detachably connected to the mating groove (8). A first docking cavity (9) is formed in the clamping housing (7), and the threaded sleeve (3) is detachably disposed in the first docking cavity (9); The second docking cavity (10) is opened in the clamping outer shell (7), and the threaded joint (2) is detachably installed in the second docking cavity (10). The first docking cavity (9) and the second docking cavity (10) are respectively installed on both sides of the docking groove (8). A sealing gasket mechanism is provided in the first docking cavity (9) and the second docking cavity (10), and the sealing gasket mechanism is used to seal in the first docking cavity (9) and the second docking cavity (10).

4. The high-strength and stable connector for ultra-high pressure hoses according to claim 3, characterized in that, When the threaded end (5) is mated with the threaded sleeve (3) and the threaded sleeve (6) is mated with the threaded joint (2), the threaded end (5) and the threaded sleeve (6) are respectively located in the first mating cavity (9) and the second mating cavity (10). When the threaded end (5) abuts against the threaded joint (2) and the threaded sleeve (6) abuts against the threaded sleeve (3), the threaded end (5) and the threaded sleeve (6) are respectively located in the second mating cavity (10) and the first mating cavity (9).

5. The high-strength and stable connector for ultra-high pressure hoses according to claim 4, characterized in that, The sealing gasket mechanism includes: There are two sealing grooves (11), both of which are opened in the docking cavity (9). The two sealing grooves (11) are respectively located in the docking cavity (9) near and away from the docking groove (8). A sealing ring (12) is detachably disposed in the sealing groove (11), and the sealing ring (12) can contact the threaded sleeve (3) and the threaded sleeve end (6); There are two sealing grooves (13), both of which are formed in the second docking cavity (10). The two sealing grooves (13) are respectively positioned in the second docking cavity (10) near and away from the docking groove (8). A second sealing ring (14) is detachably disposed in the second sealing groove (13), and the second sealing ring (14) can contact the threaded joint (2) and the threaded end (5).

6. A high-strength, stable connector for ultra-high pressure hoses according to claim 5, characterized in that, When the threaded end (6) and the threaded connector (3) abut against each other, the first sealing ring (12) is detachably disposed in the first sealing groove (11) near the mating groove (8). At this time, the first sealing ring (12) is disposed between the threaded end (6) and the threaded connector (3). When the threaded end (5) and the threaded connector (2) abut against each other, the second sealing ring (14) is detachably disposed in the second sealing groove (13) near the mating groove (8). At this time, the second sealing ring (14) is disposed between the threaded end (5) and the threaded connector (2).

7. A high-strength, stable connector for ultra-high pressure hoses according to claim 6, characterized in that, The adhesive layer protection mechanism includes: Multiple arc-shaped pressure plates (15) are provided, respectively located on both ends of the clamping housing (7). The multiple arc-shaped pressure plates (15) are arranged in a circle, and the arc-shaped pressure plates (15) are provided with threads. An arc-shaped clamp (16) is fixedly connected to one end of the arc-shaped pressure plate (15) away from the clamping housing (7), and the arc-shaped clamp (16) can contact the rubber tube (1); A tightening nut (17) is fitted onto the rubber tube (1), and the tightening nut (17) is threadedly connected to the arc-shaped pressure plate (15).

8. A high-strength, stable connector for ultra-high pressure hoses according to claim 7, characterized in that, When the two clamping shells (7) are brought together, the plurality of arc-shaped pressure plates (15) form a circle. When the arc-shaped clamp (16) is threadedly connected to the arc-shaped pressure plate (15), the arc-shaped clamp (16) on the plurality of arc-shaped pressure plates (15) presses the rubber tube (1) tightly.

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