A large-scale horizontal screw machine quick replacement adjusting piece machine shell device

Abstract

The application discloses a large-scale horizontal screw machine quick adjusting piece shell replacing device, which comprises a machine base, a machine shell and a rotating drum, characterized in that an adjusting port is arranged through the end face of the machine shell corresponding to a discharge port, a cover plate is arranged outside the adjusting port, the cover plate and the adjusting port are connected and fixed through a fastening structure, and a handle for conveniently opening and installing the cover plate is arranged on the outer side of the cover plate. The adjusting piece of the horizontal screw machine can be conveniently replaced or adjusted without disassembling the machine shell, time and labor are saved, and work efficiency is improved. The cover plate is fixed on the adjusting port in the form of fastening bolts, and the fastening between the cover plate and the flange ring can synchronously drive the buckling rings on both sides through the pulling and locking part, so that the effect of quick disassembly and fixation is achieved, the structure is simple, the design is ingenious, the operation is convenient, and work efficiency is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, specifically to a device for quickly changing the housing of a large horizontal screw press. Background Technology

[0002] The liquid-liquid-solid three-phase separation horizontal screw discharge sedimentation centrifuge is a new type of advanced horizontal screw centrifuge. It achieves effective separation of light liquid, heavy liquid, and solid phases within the same device, completely replacing the complex three-phase separation process of traditional solid-liquid two-phase separation plus liquid-liquid separation. This improves separation efficiency and reduces investment costs. This centrifuge can clarify, separate, and dehydrate materials with a particle size of 0.002-3mm, or classify solid particles with a particle size of 1um-5um. It features wide application range, continuous operation, large processing capacity, low cost, and convenient maintenance, making it the optimal equipment for solid-liquid separation. It is widely used in chemical, light industry, pharmaceutical, food, papermaking, and mining industries.

[0003] A horizontal screw press is a general-purpose device that uses centrifugal force generated by high-speed rotation for solid-liquid separation. After the materials to be separated enter the rotating drum, due to the density difference between the solid and liquid phases, the solid phase rapidly settles to the inner wall of the drum under the action of centrifugal force, while the liquid phase settles to the surface of the solid phase. The drum and the screw rotate in the same direction, and there is a speed difference between them. The solid phase is pushed towards the slag outlet at the smaller end of the drum by the screw, while the liquid phase is naturally discharged through the liquid outlet on the larger end cover shaft.

[0004] When performing solid-liquid separation in a horizontal decanter press, the adjusting fins installed on the rotating drum are usually replaced depending on the characteristics of the material and the separation requirements. These fins are used to adjust the liquid level inside the drum, thereby achieving different liquid and solid phase effects. Small horizontal decanter presses typically use a hinge between the upper and lower casings, and the upper casing is relatively lightweight, making it easy to open and replace the adjusting fins during commissioning. However, for large horizontal decanter presses, the upper casing weighs over 500 kg, requiring a lifting device to open. In some user workshops with limited space or no overhead crane, opening the upper casing becomes difficult, making it impossible to replace the adjusting fins and affecting the separation efficiency of the decanter press.

[0005] This invention will improve the design of the casing of a large horizontal screw press and invent a casing device that allows for quick replacement of the adjusting plates, which can effectively solve the above-mentioned problems. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned technical problems by providing a device for quickly changing the housing of a large horizontal screw press.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a quick-change adjustment plate housing device for a large horizontal screw press, comprising a base, a housing, and a rotating drum. An adjustment port is provided through the end face of the housing corresponding to the discharge port. A cover plate is provided outside the adjustment port. The cover plate and the adjustment port are connected and fixed by a fastening structure. A handle is provided on the outside of the cover plate to facilitate opening and installation.

[0008] Furthermore, the adjustment port is a fan-shaped hole, and the fastening structure includes screw holes, flange holes, and fastening bolts. Multiple screw holes are evenly distributed around the outer periphery of the adjustment port. The cover plate is fan-shaped, the same as the adjustment port. Multiple flange holes are distributed around the cover plate. The flange holes correspond to the screw holes, and fastening bolts are screwed through the flange holes to the screw holes.

[0009] Furthermore, two U-shaped handles are vertically fixed on the outer end face of the cover plate, and a gasket is provided between the cover plate and the adjustment port.

[0010] Furthermore, the adjustment port is rectangular, and a flange ring is provided on the outside of the adjustment port. The cover plate matches the shape of the flange ring. The fastening structure includes a first fastening ring, a second fastening ring, and a pull-locking part. The first fastening ring and the second fastening ring are driven by the pull-locking part to move symmetrically. The first fastening ring and the second fastening ring are provided with a fastening groove on one side close to each other. When the cover plate is attached to the flange ring, it is fastened to the outer edge of the cover plate and the flange ring through the fastening groove.

[0011] Furthermore, the pull-locking part is located on the outside of the cover plate and is driven by the handle to rotate the shaft inside the pull-locking part. It also includes a first pull rod and a second pull rod. The end of the first pull rod is fixedly connected to a first fastening ring, and the end of the second pull rod is fixedly connected to a second fastening ring. The first pull rod and the second pull rod slide in a single direction on the outside of the cover plate, and the directions of translation and sliding of the first pull rod and the second pull rod are parallel to each other. The first pull rod and the second pull rod are located on both sides of the rotating shaft along the axial direction of the rotating shaft, and the first pull rod and the second pull rod are simultaneously engaged with the rotating shaft in a cylindrical cam engagement.

[0012] Furthermore, the pull-locking part includes a parallel track and an installation chamber. The parallel track is fixedly installed on the outside of the cover plate, and the extension direction of the parallel track is the same as the translational sliding direction of the pull rod. The installation chamber is fixedly installed on the upper side of the middle of the parallel track. The rotating shaft is rotatably connected in the installation chamber. The two ends of the installation chamber are provided with shaft holes. The two ends of the rotating shaft pass through the shaft holes and are connected to the two ends of the handle. The side walls of the first pull rod and the second pull rod are slidably installed on the parallel track.

[0013] Furthermore, the ends of the first and second pull rods are respectively connected to a first upright plate and a second upright plate, which are respectively set on both sides of the rotating shaft. The first and second upright plates are respectively vertically provided with a first pin and a second pin. The circumferential sidewall of the rotating shaft is provided with a first cam groove and a second cam groove. The first pin is placed in the first cam groove and the second pin is placed in the second cam groove. The first cam groove and the second cam groove are centrally symmetrically distributed with respect to the center point of the rotating shaft.

[0014] Furthermore, it also includes a guide and limiting structure, which includes a limiting rod and a limiting waist hole. The limiting rod, the first pull rod, and the second pull rod are fixedly provided with limiting waist holes along their long axis direction, and the limiting rod is placed in the limiting waist hole.

[0015] Furthermore, both the first and second fastening rings are U-shaped, including a long bottom edge and short side edges symmetrically provided on both sides of the long bottom edge. The length of the long bottom edge matches that of one side of the cover plate, and the two short side edges are used for positioning the cover plate relative to the two side edges.

[0016] Furthermore, the cross-section of the groove is an isosceles trapezoid, and the waist surfaces on both sides of the groove are used to gradually clamp the cover plate and the flange ring.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This invention allows for convenient replacement or adjustment of the adjusting plates of the horizontal screw press without disassembling the machine casing, saving time and effort and improving work efficiency.

[0019] 2. Using fastening bolts to fix the cover plate to the adjustment port can provide a high degree of stability.

[0020] 3. The cover plate and flange ring are fastened by the pull locking part, which synchronously drives the fastening rings on both sides. This can achieve quick disassembly and fixation. The structure is simple, the design is ingenious, the operation is convenient, and the work efficiency is effectively improved. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the large horizontal screw press device in this application;

[0022] Figure 2 This is a longitudinal cross-sectional schematic diagram of a quick-change regulating plate housing device for a large horizontal screw press according to this application;

[0023] Figure 3 This is a front view of a quick-change device for the regulating plate housing of a large horizontal screw press according to this application;

[0024] Figure 4 This is a schematic diagram illustrating how the cover plate is locked to the flange ring using a fastening ring in this application;

[0025] Figure 5 This is a schematic diagram of the locking contact of the fastening ring in this application;

[0026] Figure 6 This is a schematic diagram of the cover plate removal in this application;

[0027] Figure 7 For the explosion of the tension locking part in this application Figure 1 ;

[0028] Figure 8 For the explosion of the tension locking part in this application Figure 2 ;

[0029] Figure 9 This is a schematic diagram of the cross-section of the fastening ring in this application;

[0030] In the diagram: 1. Base; 2. Housing; 3. Drum; 4. Adjusting plate; 5. Adjusting port; 6. Cover plate; 7. Handle; 8. Screw hole; 9. Flange hole; 10. Fastening bolt; 11. Washer; 12. Flange ring; 13. First fastening ring; 14. Second fastening ring; 15. Pull-locking part; 16. Fastening groove; 17. Rotating shaft; 18. First pull rod; 19. Second pull rod; 20. Parallel track; 21. Installation compartment; 22. Shaft hole; 23. First upright plate; 24. Second upright plate; 25. First pin; 26. Second pin; 27. First cam groove; 28. Second cam groove; 29. ​​Limiting rod; 30. Limiting waist hole; 31. Long bottom edge; 32. Short side edge. Detailed Implementation

[0031] The technical solution 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.

[0032] Example 1:

[0033] A quick-change device for the regulating vane housing of a large horizontal screw press, such as Figure 1 As shown, the device includes a base 1, a housing 2, and a rotating drum 3. The base 1 and housing 2 form a accommodating cavity, within which the rotating drum 3 is rotatably mounted. The housing 2 has a semi-cylindrical structure and is connected to the upper side of the base 1. An adjusting plate 4 is provided on the discharge port at the end face of the rotating drum 3. Figure 2As shown, the casing 2 of the small horizontal screw press is lightweight and easy to open. In this application, the casing 2 of the large horizontal screw press is relatively heavy and usually requires the use of cranes or other lifting equipment to open. In actual use, it is often necessary to adjust the outlet opening at the end of the drum 3. Opening the casing 2 in this embodiment is cumbersome. As an improvement, an adjustment port 5 is provided through the end face of the casing 2 corresponding to the discharge port. The adjustment port 5 is provided with a cover plate 6. Therefore, in actual use, it is only necessary to open the adjustment port 5 to replace or adjust the internal adjustment plate 4, which is convenient.

[0034] like Figure 2 , 3 As shown, the cover plate 6 and the adjustment port 5 are connected and fixed by a fastening structure. A handle 7 is provided on the outer side of the cover plate 6 for easy opening and installation. When the cover plate 6 is opened or closed, the handle 7 can be gripped to stabilize the cover plate 6, thus facilitating installation and disassembly. Specifically, the adjustment port 5 is a fan-shaped hole. The fastening structure includes screw holes 8, flange holes 9, and fastening bolts 10. Multiple screw holes 8 are evenly distributed around the outer periphery of the adjustment port 5. The cover plate 6 has the same fan shape as the adjustment port 5, and multiple flange holes 9 are distributed around its periphery. The flange holes 9 correspond to the screw holes 8, and fastening bolts 10 are threaded through the flange holes 9 and connected to the screw holes 8. To improve sealing, two U-shaped handles 7 are vertically fixed to the outer end face of the cover plate 6. A washer 11 is provided between the cover plate 6 and the adjustment port 5.

[0035] In actual use, a fan-shaped hole is provided on the end face of the upper housing 2 at the position corresponding to the adjusting plate 4. Screw holes 8 are provided around the fan-shaped hole. A corresponding fan-shaped cover plate 6 is provided on the fan-shaped hole. Two handles 7 are also provided on the fan-shaped cover plate 6 to facilitate the opening and installation of the cover plate 6. A rubber gasket 11 is provided between the cover plate 6 and the housing 2 for sealing. The cover plate 6 is fixed to the housing 2 by fastening bolts 10. When it is necessary to replace the adjusting plate 4, simply remove the cover plate 6 to replace and adjust the adjusting plate 4.

[0036] After adopting this technical solution, the adjusting plate 4 of the horizontal screw press can be easily replaced, saving time and effort and increasing efficiency by more than 200%.

[0037] Example 2:

[0038] In Embodiment 1, while the method of setting fastening bolts 10 around the perimeter provides good fixing performance, the process of installing and removing the bolts is relatively lengthy, which can easily lead to reduced work efficiency. To solve this problem, this embodiment eliminates the bolt fastening method and adopts a more efficient fastening structure for installation and disassembly. In actual use, the purpose of the casing 2 of the horizontal screw press is to wrap around the outside of the rotating drum 3, collecting and gathering the material separated from the rotating drum 3 to prevent the material from scattering everywhere. Therefore, the sealing and pressure resistance requirements of the casing 2 are not high. Based on this characteristic, this embodiment improves the fastening structure.

[0039] Specifically, the adjustment port 5 is rectangular. In actual use, the adjustment port 5 can also be designed as a circle, ellipse, or other symmetrical shape. In this embodiment, a rectangular adjustment port 5 is used as an example. Figure 6 As shown, a flange ring 12 is provided on the outside of the adjustment port 5. The flange ring 12 is fixedly welded to the outside of the adjustment port 5, and the flange ring 12 is combined with the cover plate 6. In this embodiment, the fixing effect is achieved by fastening the flange ring 12 and the cover plate 6 to the outer periphery.

[0040] The cover plate 6 is shaped to fit the flange ring 12; the fastening structure includes a first fastening ring 13, a second fastening ring 14, and a pull-locking part 15, such as Figure 4 , 5 As shown, the first fastening ring 13 and the second fastening ring 14 are symmetrically arranged on both sides of the cover plate 6. The first fastening ring 13 and the second fastening ring 14 are driven to move symmetrically by the pulling and locking part 15. The first fastening ring 13 and the second fastening ring 14 have fastening grooves 16 on their respective sides. When the cover plate 6 is attached to the flange ring 12, the fastening grooves 16 secure the cover plate 6 to the outer edge of the flange ring 12. When the two fastening rings are close to each other, the fastening grooves 16 of the two fastening rings fasten to the edges of the cover plate 6 and the flange ring 12, as shown. Figure 4 As shown; conversely, when disassembly is required, such as Figure 5 As shown, the two locking rings move away from each other, thereby separating the locking rings on both sides from the cover plate 6 and the flange ring 12, thus releasing the lock. At this time, the cover plate 6 can be released as follows: Figure 6 As shown, it is removed from flange ring 12. The entire process eliminates the need for tightening bolts around the perimeter, simplifying the operation and increasing work efficiency.

[0041] like Figure 9As shown, the cross-section of the retaining groove 16 is an isosceles trapezoid, and the waist surfaces on both sides of the retaining groove 16 are used to gradually clamp the cover plate 6 and the flange ring 12. As can be seen from the figure, the cross-section of the retaining rings on both sides is pliers-shaped, so when the retaining rings on both sides are close together, they can be firmly clamped onto the cover plate 6 and the flange ring 12 for fastening; and the retaining groove 16 is designed in the shape of an isosceles trapezoid, which utilizes the inclined surfaces of the sides to achieve a clamping effect on the flange ring 12 and the cover plate 6. In actual use, a gasket 11 can also be placed between the flange ring 12 and the cover plate 6 to increase the sealing performance.

[0042] like Figure 7 , 8 As shown, the pull-locking part 15 is located on the outside of the cover plate 6, and the rotating shaft 17 inside the pull-locking part 15 is driven to rotate by the handle 7. It also includes a first pull rod 18 and a second pull rod 19. The end of the first pull rod 18 is fixedly connected to the first fastening ring 13, and the end of the second pull rod 19 is fixedly connected to the second fastening ring 14. Thus, the fastening rings on both sides can be moved by pulling or pushing the pull rods on both sides respectively.

[0043] The first pull rod 18 and the second pull rod 19 slide in a single direction on the outside of the cover plate 6, and the sliding directions of the first pull rod 18 and the second pull rod 19 are parallel to each other. The movement of the fastening ring at the end of the pull rod is controlled by the parallel movement of the two pull rods. Specifically, the cover plate 6 is provided with a parallel track 20 to guide the movement of the pull rods, and also with a guide limiting structure. The guide limiting structure includes a limiting rod 29 and a limiting waist hole 30. The cover plate 6 is fixedly provided with a limiting rod 29, and the first pull rod 18 and the second pull rod 19 are provided with limiting waist holes 30 along their long axis. The limiting rod 29 is placed in the limiting waist hole 30. Figure 7 , 8 As shown, each pull rod is provided with two parallel limiting holes 30, and the major axis directions of the two limiting holes 30 are parallel to each other. Correspondingly, two limiting rods 29 are provided on the pull rod. Based on the principle that two points limit a straight line, the sliding direction of the pull rod can be fixed, and the sliding limit is improved by the parallel rail 20.

[0044] The first pull rod 18 and the second pull rod 19 are arranged on both sides of the rotating shaft 17 along the axial direction of the rotating shaft 17, and the first pull rod 18 and the second pull rod 19 are simultaneously engaged with the rotating shaft 17 via cylindrical cams. The cylindrical cams within the pull-locking part 15 serve as a mirror-image movement control mechanism to drive the two locking rings. Specifically, the pull-locking part 15 includes a parallel track 20 and a mounting chamber 21. The parallel track 20 is fixedly arranged on the outside of the cover plate 6, and the extension direction of the parallel track 20 is the same as the translational sliding direction of the pull rods. The mounting chamber 21 is fixedly arranged on the upper side of the middle of the parallel track 20. The rotating shaft 17 is rotatably connected inside the mounting chamber 21. The mounting chamber 21 is a semi-cylindrical hollow cavity with shaft holes 22 at both ends. The rotating shaft 17 is rotatably connected inside the mounting chamber 21, and both ends of the rotating shaft 17 pass through the shaft holes 22 and connect to the two ends of the handle 7. The side walls of the first pull rod 18 and the second pull rod 19 are slidably arranged on the parallel track 20. Figure 3 As shown, the rotation of the two handles 7, bringing them closer together, drives the two rotating shafts 17 to rotate, simultaneously pulling the pull rods on both sides closer together. This controls the fastening rings on both sides to fasten onto the cover plate 6 and the flange ring 12, achieving a secure fit. Conversely, when disassembly is required, the two handles 7 are rotated in the opposite direction, as shown in the diagram. Figure 4 As shown, the locking rings on both sides are pushed out by pulling the lever, thus unlocking the device. Figure 8 As shown, both the first fastening ring 13 and the second fastening ring 14 are U-shaped, including a long bottom edge 31 and short side edges 32 symmetrically arranged on both sides of the long bottom edge 31. The long bottom edge 31 matches the length of one side edge of the cover plate 6, and the two short side edges 32 are used to position the cover plate 6 relative to the two side edges. When fastening is achieved, the long bottom edge 31 can clamp the entire corresponding side edge of the cover plate 6, while the two short side edges 32 can clamp and position the other two side edges and fix the corner positions.

[0045] To control the mirror movement of the two fastening rings, specifically, as follows: Figure 8 As shown, the ends of the first pull rod 18 and the second pull rod 19 are respectively connected to a first upright plate 23 and a second upright plate 24. The two upright plates are respectively set on both sides of the rotating shaft 17. The first upright plate 23 and the second upright plate 24 are respectively vertically provided with a first pin 25 and a second pin 26. The circumferential side wall of the rotating shaft 17 is provided with a first cam groove 27 and a second cam groove 28. The first pin 25 is placed in the first cam groove 27, and the second pin 26 is placed in the second cam groove 28. The first cam groove 27 and the second cam groove 28 are centrally symmetrically distributed with respect to the center point of the rotating shaft 17. It can be understood that when the handle 7 is pulled to rotate, the handle 7 drives the rotating shaft 17 to rotate. The two cam grooves on the rotating shaft 17 then push or pull the pull rod to move through the corresponding pins, thereby achieving the purpose of controlling the mirror movement of the fastening rings on both sides.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A quick-change device for the housing of a large horizontal screw press, comprising a base (1), a housing (2), and a rotating drum (3), characterized in that, An adjustment port (5) is provided through the end face of the housing (2) corresponding to the discharge port. A cover plate (6) is provided outside the adjustment port (5). The cover plate (6) and the adjustment port (5) are connected and fixed by a fastening structure. A handle (7) is provided on the outside of the cover plate (6) to facilitate the opening and installation of the cover plate (6). The adjustment port (5) is rectangular, and a flange ring (12) is provided on the outside of the adjustment port (5). The cover plate (6) is shaped to match the flange ring (12). The fastening structure includes a first fastening ring (13), a second fastening ring (14), and a pull-locking part (15). The first fastening ring (13) and the second fastening ring (14) are driven by the pull-locking part (15) to move symmetrically. The first fastening ring (13) and the second fastening ring (14) are provided with a fastening groove (16) on one side close to each other. When the cover plate (6) is attached to the flange ring (12), it is fastened to the outer edge of the cover plate (6) and the flange ring (12) through the fastening groove (16). The pull-locking part (15) is located on the outside of the cover plate (6) and is driven by the handle (7) to rotate the rotating shaft (17) inside the pull-locking part (15). It also includes a first pull rod (18) and a second pull rod (19). The end of the first pull rod (18) is fixedly connected to a first fastening ring (13), and the end of the second pull rod (19) is fixedly connected to a second fastening ring (14). The first pull rod (18) and the second pull rod (19) slide in a single direction on the outside of the cover plate (6), and the sliding directions of the first pull rod (18) and the second pull rod (19) are parallel to each other. The first pull rod (18) and the second pull rod (19) are located on both sides of the rotating shaft (17) along the axial direction of the rotating shaft (17), and the first pull rod (18) and the second pull rod (19) are simultaneously engaged with the rotating shaft (17) in a cylindrical cam engagement. The ends of the first pull rod (18) and the second pull rod (19) are respectively connected to a first upright plate (23) and a second upright plate (24). The two upright plates are respectively set on both sides of the rotating shaft (17). The first upright plate (23) and the second upright plate (24) are respectively vertically provided with a first pin (25) and a second pin (26). The circumferential side wall of the rotating shaft (17) is provided with a first cam groove (27) and a second cam groove (28). The first pin (25) is placed in the first cam groove (27), and the second pin (26) is placed in the second cam groove (28). The first cam groove (27) and the second cam groove (28) are centrally symmetrically distributed with respect to the center point of the rotating shaft (17).

2. The device for quick replacement of the adjusting plate housing of a large horizontal screw press according to claim 1, characterized in that, The pull-locking part (15) includes a parallel track (20) and an installation chamber (21). The parallel track (20) is fixedly installed on the outside of the cover plate (6), and the extension direction of the parallel track (20) is the same as the translational sliding direction of the pull rod. The installation chamber (21) is fixedly installed on the upper side of the middle part of the parallel track (20). The rotating shaft (17) is rotatably connected in the installation chamber (21). The two ends of the installation chamber (21) are provided with shaft holes (22). The two ends of the rotating shaft (17) pass through the shaft holes (22) and are connected to the two ends of the handle (7). The side walls of the first pull rod (18) and the second pull rod (19) are slidably installed on the parallel track (20).

3. The device for quick replacement of the adjusting plate housing of a large horizontal screw press according to claim 1, characterized in that, It also includes a guide limiting structure, which includes a limiting rod (29) and a limiting waist hole (30). The limiting rod (29) is fixedly provided on the cover plate (6), and the first pull rod (18) and the second pull rod (19) are provided with limiting waist holes (30) along the long axis direction. The limiting rod (29) is placed in the limiting waist hole (30).

4. The quick-change device for the adjusting plate housing of a large horizontal screw press according to claim 1, characterized in that, The first fastening ring (13) and the second fastening ring (14) are both U-shaped, including a long bottom edge (31). Short side edges (32) are symmetrically provided on both sides of the long bottom edge (31). The long bottom edge (31) matches the length of one side edge of the cover plate (6). The two short side edges (32) are used to position the cover plate (6) relative to the two sides.

5. A quick-change device for the adjusting plate housing of a large horizontal screw press according to claim 1, characterized in that, The cross-section of the groove (16) is an isosceles trapezoid, and the waist surfaces on both sides of the groove (16) are used to gradually clamp the cover plate (6) and the flange ring (12).

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