An integrated device for multi-size screening and cleaning of recycled aggregates and a method of use thereof

Abstract

The present invention discloses an integrated device for multi-size screening and cleaning of recycled aggregate and a method for use, which belongs to the technical field of screen equipment, and includes a washing bin and a screening bin correspondingly arranged at the top of the washing bin for screening raw aggregate. The outer side of the screening bin is provided with two smooth round rods distributed transversely and longitudinally, and the smooth round rods are evenly sleeved with a plurality of metal rings along the length direction of the outer side thereof, and a high elastic spring is arranged between the two metal rings, and a rigid bar is welded to one side of the metal ring in the horizontal direction, and the rigid bar forms a criss-crossing screen on the horizontal plane of the inner wall of the screening bin. The present invention can adjust the spacing between the rigid bars through the cooperation of the high elastic spring and the metal ring to achieve the size change of the screen, and realize the up and down vibration of the screening bin by using the telescopic rod and the elastic support member, and can accurately screen the raw aggregate, improve the quality of the recycled aggregate, and reduce the labor intensity.

Description

Technical Field

[0001] The invention relates to the technical field of screen equipment, and in particular to an integrated device for multi-size screening and cleaning of recycled aggregates and a use method thereof. Background Art

[0002] During the preparation process of recycled aggregate from waste construction waste, the particle sizes of the recycled aggregate produced are different due to mechanical crushing and impact, and a large amount of mortar, dust and other substances are attached to it. In order to meet engineering specifications, the waste raw aggregate needs to be screened and cleaned.

[0003] At present, the screens of recycled aggregate screening and cleaning devices can generally only screen aggregates of a specific particle size in sequence, which has certain limitations and is uneconomical. In addition, workers may be injured by falling aggregates when using the screens for screening, and manual washing is required after screening, which is time-consuming and labor-intensive. Summary of the invention

[0004] The purpose of the present invention is to provide an integrated device for multi-size screening and cleaning of recycled aggregates and a method of use thereof, in view of the problem that the screens of existing recycled aggregate screening and cleaning devices can generally only screen aggregates of a specific particle size in sequence, which has certain limitations.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0006] The present invention provides an integrated device for multi-size screening and cleaning of recycled aggregates, comprising a washing bin and a screening bin correspondingly arranged at the top of the washing bin for screening raw aggregates, wherein two smooth round rods distributed transversely and longitudinally are arranged on the outside of the screening bin, and a plurality of metal rings are evenly sleeved on the smooth round rods along the length direction of the outer side thereof, a high-elasticity spring is arranged between the two metal rings, a rigid strip is welded to one side of the metal ring in the horizontal direction, and the rigid strip forms a criss-crossing screen on the horizontal plane of the inner wall of the screening bin.

[0007] Preferably, a telescopic rod capable of moving in a vertical direction and an elastic support member sleeved on the outside of the telescopic rod are provided between the screening bin and the washing bin.

[0008] Preferably, a vibration switch and a cleaning power switch are provided on one side of the outer wall of the material washing bin, and a water inlet and a drain valve are provided on the other side of the outer wall of the material washing bin.

[0009] Preferably, a rotating shaft is rotatably connected to the inside of the washing bin via a bearing, a plurality of groups of detachable nylon cloths are symmetrically arranged on the outer wall of the rotating shaft, an openable base is arranged at the bottom of the washing bin, a rotating machine is installed on the inner wall of the washing bin, and the rotating machine corresponds to the rotating shaft.

[0010] Preferably, both ends of the smooth round rod are respectively provided with a rotating bolt and a fixing bolt, the fixing bolt is fixedly connected to the screening bin, the bottom of the screening bin is provided with slide grooves on all four sides, and the rigid bar passes through the slide groove and extends to the screening bin.

[0011] Preferably, the front end of the base is connected by a tenon and a mortise, and the rear end of the base is connected by a cylindrical hinge.

[0012] Preferably, a limiting mechanism is arranged inside the slide groove, and the limiting mechanism includes a fixed plate horizontally arranged inside the slide groove, a group of rollers correspondingly arranged at the bottom of the fixed plate and capable of moving in the horizontal direction of the slide groove, a polygonal stop wheel is rotatably connected to the middle position of the roller through a bearing, and the limiting mechanism also includes a brake plate correspondingly arranged at the top of the polygonal stop wheel and capable of moving in the vertical direction.

[0013] Preferably, the limiting mechanism also includes a connecting rod that vertically passes through the fixed plate and can move in the vertical direction, and the bottom end of the connecting rod is fixedly connected to the brake plate; the limiting mechanism also includes an elastic member that provides damping when the connecting rod moves in the horizontal direction, and a rotating rod that can rotate in a circular direction is correspondingly provided at the top end of the connecting rod, and an extrusion wheel is provided on the outside of the rotating rod.

[0014] The present invention also provides a method for using an integrated device for multi-size screening and cleaning of recycled aggregates, comprising the following steps:

[0015] S1. First, add water through the water inlet until the shaft is submerged in water;

[0016] S2. Then, before using the machine, rotate the rotating bolt in advance to displace the metal ring in the smooth round rod, adjust the spacing between the rigid bars, and after obtaining a suitable sieve hole size, limit the position of the rigid bars through the limiting mechanism;

[0017] S3. After the size of the sieve hole is determined, add the recycled aggregate into the sieve bin. At this time, turn on the vibration switch to control the cyclic extension and retraction of the telescopic rod to achieve the up and down vibration of the sieve bin. The elastic support on the outside of the telescopic rod makes the sieve bin vibrate continuously up and down to recover kinetic energy and screen the aggregate with appropriate particle size into the washing bin.

[0018] S4, then turn on the cleaning power switch to drive the rotating machine to rotate through the power supply, drive the rotating shaft, and after the water flows out, pull the tenon open, so that the base can be dumped under the rotation of the cylindrical hinge.

[0019] Compared with the prior art, the above technical solution has the following beneficial effects:

[0020] The present invention can adjust the spacing between the rigid bars through the cooperation of the high-elastic spring and the metal ring, thereby realizing the size change of the screen and obtaining a suitable screen hole size. The use of the telescopic rod and the elastic support member can realize the up and down vibration of the screening bin, which can accurately screen the raw aggregate, improve the quality of the recycled aggregate, and reduce the labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a side sectional view of the overall structure of the present invention;

[0024] Figure 3 is a top view of the present invention;

[0025] Figure 4 is a top cross-sectional view of the present invention;

[0026] Figure 5 It is a schematic diagram of the connection structure between the elastic support member and the telescopic rod of the present invention;

[0027] Figure 6 It is a schematic diagram of the local structure of the screening bin of the present invention;

[0028] Figure 7 It is a schematic diagram of the connection structure between the smooth round rod and the metal ring of the present invention;

[0029] Figure 8 It is a schematic diagram of the local structure of the limiting mechanism of the present invention;

[0030] Fig. 9 The present invention Figure 8 A magnified view of the structure at A;

[0031] Fig.10 It is a right view of the limiting mechanism of the present invention.

[0032] In the figure:

[0033] 1. Drain valve; 2. Washing bin; 3. Water filling port; 4. Vibration switch; 5. Cleaning power switch; 6. Tenon; 7. Tenon groove; 8. Elastic support; 9. Telescopic rod; 10. Rotating bolt; 11. High elastic spring; 12. Smooth round rod; 13. Metal ring; 14. Rigid bar; 15. Slide; 151. Roller; 152. Polygonal stop wheel; 153. Brake plate; 154. Fixed plate; 155. Extrusion wheel; 156. Rotating rod; 157. Connecting rod; 158. Elastic part; 16. Screening bin; 17. Turning machine; 18. Rotating shaft; 19. Nylon cloth; 20. Base; 21. Cylindrical hinge; 22. Fixing bolt. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0037] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0038] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] like Figure 1 - Figure 7 As shown, an integrated device for multi-size screening and cleaning of recycled aggregates comprises a washing bin 2 and a screening bin 16 correspondingly arranged at the top of the washing bin 2 for screening raw aggregates, two smooth round rods 12 distributed transversely and longitudinally are arranged on the outside of the screening bin 16, a plurality of metal rings 13 are evenly sleeved on the smooth round rods 12 along the length direction of the outer side thereof, a high elastic spring 11 is arranged between the two metal rings 13, a rigid strip 14 is welded to one side of the metal ring 13 in the horizontal direction, and the rigid strip 14 forms a crisscross screen on the horizontal plane of the inner wall of the screening bin 16;

[0040] When in use, the rotating bolt 10 is rotated in advance. When the rotating bolt 10 rotates inside the smooth round rod 12, the high elastic spring 11 is squeezed and pressure is applied to the high elastic spring 11. Due to the elastic force of the high elastic spring 11, the metal ring 13 is displaced in the smooth round rod 12. Multiple metal rings 13 move under the squeezing of the high elastic spring 11, thereby driving the rigid bars 14 on the outside thereof to move horizontally inside the screening bin 16, thereby adjusting the size between the rigid bars 14, and then realizing the size change of the screen, such as 2.36mm, 4.75mm, 9.50mm, 16.0mm, 19.0mm, 26.5mm, 31.5mm, 37.5mm, and then obtaining the side length of the square hole screen required by the specification of recycled aggregate for concrete, and being able to adjust the size of the screen hole according to needs, avoiding the traditional design of one size for one screen, which not only reduces the use cost, but also obtains aggregates of different particle sizes, can accurately screen raw aggregates, and improves the quality of recycled aggregates.

[0041] In this embodiment, a telescopic rod 9 capable of moving in the vertical direction and an elastic support member 8 sleeved on the outside of the telescopic rod 9 are provided between the screening bin 16 and the washing bin 2. The vibration switch 4 is activated to make the telescopic rod 9 extend and retract up and down according to the frequency, thereby driving the vibration of the screening bin 16 and the recycled aggregate. An elastic support member 8 is provided on the outside of the telescopic rod 9. The elastic action of the elastic support member 8 cooperates with the extension and retraction of the telescopic rod 9, which can, on the one hand, enable the screening bin 16 to continue to vibrate and recover kinetic energy, and on the other hand, avoid collision between the washing bin 2 and the screening bin 16, thereby greatly reducing labor intensity, improving screening efficiency, and realizing automation.

[0042] In this embodiment, a vibration switch 4 and a cleaning power switch 5 are provided on one side of the outer wall of the washing bin 2, and a water injection port 3 and a drain valve 1 are provided on the other side of the outer wall of the washing bin 2. The vibration switch 4 and the cleaning power switch 5 are turned on to screen the recycled aggregate to the washing bin 2 under the action of vibration. When the raw aggregate is cleaned, the cleaning power switch 5 is turned off, the drain valve 1 is opened to discharge the waste water, and the clean recycled aggregate is dumped.

[0043] In this embodiment, the washing bin 2 is internally connected with a rotating shaft 18 through a bearing, and the outer wall of the rotating shaft 18 is symmetrically provided with a plurality of groups of detachable nylon cloths 19. The bottom of the washing bin 2 is provided with an openable base 20. The inner wall of the washing bin 2 is equipped with a rotating machine 17, and the rotating machine 17 corresponds to the rotating shaft 18. When the cleaning power switch 5 is started, the rotating shaft 18 is driven to rotate by the rotating machine 17, and the nylon cloth 19 on the rotating shaft 18 is driven to rotate, so as to stir the recycled aggregate in the washing bin 2 and wash away the attached The dust and mortar are removed, and finally the vibration switch 4 and the cleaning power switch 5 are turned off, the drain valve 1 is opened to discharge the waste water, and the clean recycled aggregate is dumped to complete the cleaning of the aggregate. The aggregate can be cleaned at the same time as screening, which improves the work efficiency of traditional manual screening and manual washing, and makes the process more mechanized, efficient and convenient. The nylon cloth 19 is soft and wear-resistant, and can resist stretching and tearing. When cleaning the raw aggregate, it can not only reduce the damage rate of the recycled aggregate, but also clean it more thoroughly.

[0044] In this embodiment, a rotating bolt 10 and a fixing bolt 22 are respectively provided at both ends of the smooth round rod 12. The fixing bolt 22 is fixedly connected to the screening bin 16. The bottom of the screening bin 16 is provided with slide grooves 15 on all four sides. The rigid bar 14 passes through the slide groove 15 and extends to the screening bin 16, so as to facilitate the displacement of the rigid bar 14 in the lateral and longitudinal directions.

[0045] In this embodiment, the base 20 is connected to the front end of the washing bin 2 through a tenon 6 and a mortise 7, and the base 20 is connected to the rear end of the washing bin 2 through a cylindrical hinge 21. The base 20 is rotated downward by pulling the tenon 6 to complete the dumping of aggregate.

[0046] In this embodiment, a limiting mechanism is arranged inside the slide groove 15, and the limiting mechanism includes a fixed plate 154 horizontally arranged inside the slide groove 15, and a group of rollers 151 correspondingly arranged at the bottom of the fixed plate 154 and capable of moving in the horizontal direction along the slide groove 15, and a polygonal stop wheel 152 is rotatably connected to the middle position of the roller 151 through a bearing, and the limiting mechanism also includes a brake plate 153 correspondingly arranged at the top of the polygonal stop wheel 152 and capable of moving in the vertical direction.

[0047] In this embodiment, the limiting mechanism further includes a connecting rod 157 which vertically penetrates the fixing plate 154 and can move in the vertical direction, and the bottom end of the connecting rod 157 is fixedly connected to the brake plate 153; the limiting mechanism further includes an elastic member 158 which provides damping when the connecting rod 157 moves in the horizontal direction, and a rotating rod 156 which can rotate in the circumferential direction is correspondingly provided at the top end of the connecting rod 157, and an extrusion wheel 155 is sleeved on the outside of the rotating rod 156;

[0048] like Figure 8 - Fig.10 As shown, when the rotating bolt 10 is rotated to squeeze the high elastic spring 11 to adjust the spacing of the rigid bar 14, the rigid bar 14 drives the roller 151 sleeved on the outer wall to slide along the slide groove 15. When the rigid bar 14 is adjusted, the extrusion wheel 156 on the outer wall is driven to rotate by rotating the rotating rod 156. Due to the special shape of the extrusion wheel 156, its radius increases along its circumferential direction, so that the extrusion wheel 156 squeezes the connecting rod 157 when rotating, driving the brake plate 153 at its bottom to gradually move down and resist the polygonal stop wheel 152, so that the roller 151 is braked by vertical pressure to prevent the mesh aperture from changing due to vibration, impact and the like during the screening process. At the same time, the polygon in this embodiment The outer wall of the polygonal stop wheel 152 is provided with an anti-skid rubber layer to increase the contact area and resistance between the polygonal stop wheel 152 and the brake plate 153, thereby limiting the roller 151 to prevent it from sliding, thereby avoiding that after the rigid bars 14 are adjusted, when the recycled aggregate with larger particles vibrates up and down on the screen formed by the criss-crossing rigid bars 14 and produces impact, the high-elasticity springs 11 between the metal rings 13 are elastic, and the rigid bars 14 are easily displaced after being impacted. The roller 151 can be limited by the limiting mechanism, thereby preventing the rigid bars 14 from being displaced and causing the screen aperture to become larger, which helps to stably filter the recycled aggregate particles with a set aperture, thereby improving the quality of product filtration.

[0049] The method for using the above-mentioned integrated device for multi-size screening and cleaning of recycled aggregates in the present invention comprises the following steps:

[0050] S1. First, water is added through the water injection port 3, preferably the rotating shaft 18 is submerged in water, and the preparations for cleaning the raw aggregate are prepared in advance to facilitate the cleaning of the raw aggregate;

[0051] S2. Then, the rotating bolt 10 is rotated in advance before the machine is used. The rotating bolt 10 applies pressure to the high elastic spring 11, so that the metal ring 13 is displaced in the smooth round rod 12. The multiple metal rings 13 move under the pressure of the high elastic spring 11, thereby driving the rigid bars 14 on the outside thereof to move horizontally inside the screening bin 16, thereby adjusting the spacing between the rigid bars 14, and then realizing the size change of the screen to obtain a suitable screen hole size. Then, the position of the rigid bars 14 is limited by the limiting mechanism, so that the raw aggregate can be accurately screened, thereby improving the quality of the recycled aggregate;

[0052] S3, after the size of the screen hole is determined, the recycled aggregate is added to the screening bin 16, and the vibration switch 4 is turned on at this time to control the cyclic extension and contraction of the telescopic rod 9. The elastic support member 8 on the outer side of the telescopic rod 9 causes the screening bin 16 to vibrate continuously up and down, so as to realize the up and down vibration of the screening bin 16, and at the same time, kinetic energy can be recovered, and the aggregate with suitable particle size can be screened into the washing bin 2, and at the same time, the clogging of the screen can be prevented, and on the other hand, the collision between the washing bin 2 and the screening bin 16 can be avoided. The screening bin 16 can screen the aggregate with suitable particle size into the washing bin 2 by vibrating up and down, thereby reducing the labor intensity, improving the screening efficiency, and realizing automation;

[0053] S4, then turn on the cleaning power switch 5 to drive the rotating machine 17 to rotate through the power supply, drive the rotating shaft 18 and the nylon cloth 19 to rotate in the water, and the nylon cloth 19 is driven by the rotating shaft 18 inside the washing bin 2 to stir the recycled aggregate in the washing bin 2, wash away the attached dust and mortar, and complete the cleaning of the recycled aggregate. The nylon cloth 19 is soft and wear-resistant, and can resist stretching and tearing. When cleaning the raw aggregate, it can not only reduce the damage rate of the recycled aggregate, but also clean it more thoroughly;

[0054] S5. After cleaning is completed, loosen the drain valve 1, and pull open the tenon 6 after the water has drained out, so that the base 20 can be unloaded under the rotation of the cylindrical hinge 21.

[0055] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. An integrated device for screening and cleaning recycled aggregates in multiple sizes, comprising a washing bin (2) and a screening bin (16) correspondingly arranged at the top of the washing bin (2) for screening raw aggregates, characterized in that: Two smooth round rods (12) are arranged on the outside of the screening bin (16) and are distributed in the transverse direction and the longitudinal direction. A plurality of metal rings (13) are evenly sleeved on the smooth round rods (12) along the length direction of the outside. A high elasticity spring (11) is arranged between the two metal rings (13). A rigid strip (14) is welded to one side of the metal ring (13) in the horizontal direction. The rigid strip (14) forms a crisscross screen on the horizontal plane of the inner wall of the screening bin (16). The two ends of the smooth round rod (12) are respectively provided with a rotating bolt (10) and a fixing bolt (22), the fixing bolt (22) being fixedly connected to the screening bin (16), the bottom of the screening bin (16) being provided with sliding grooves (15) on all four sides, the rigid strip (14) passing through the sliding grooves (15) and extending to the screening bin (16); A limiting mechanism is arranged inside the slide groove (15), the limiting mechanism comprising a fixing plate (154) arranged horizontally inside the slide groove (15), a group of rollers (151) arranged correspondingly at the bottom of the fixing plate (154) and capable of moving in the horizontal direction along the slide groove (15), a polygonal stop wheel (152) rotatably connected to the middle position inside the roller (151) via a bearing, and the limiting mechanism further comprising a brake plate (153) arranged correspondingly at the top of the polygonal stop wheel (152) and capable of moving in the vertical direction; The limiting mechanism further comprises a connecting rod (157) vertically penetrating the fixing plate (154) and capable of moving in the vertical direction, the bottom end of the connecting rod (157) being fixedly connected to the brake plate (153); the limiting mechanism further comprises an elastic member (158) for providing damping when the connecting rod (157) moves in the horizontal direction, the top end of the connecting rod (157) being correspondingly provided with a rotating rod (156) capable of rotating in a circumferential direction, the rotating rod (156) being externally sleeved with an extrusion wheel (155); A telescopic rod (9) capable of moving in a vertical direction and an elastic support member (8) sleeved on the outside of the telescopic rod (9) are provided between the screening bin (16) and the washing bin (2); A vibration switch (4) and a cleaning power switch (5) are provided on one side of the outer wall of the washing bin (2), and a water inlet (3) and a drain valve (1) are provided on the other side of the outer wall of the washing bin (2).

2. The integrated device for multi-size screening and cleaning of recycled aggregate according to claim 1 is characterized in that: A rotating shaft (18) is rotatably connected to the inside of the washing bin (2) via a bearing, and a plurality of groups of detachable nylon cloths (19) are symmetrically arranged on the outer wall of the washing bin (2). An openable base (20) is arranged at the bottom of the washing bin (2), and a rotating machine (17) is mounted on the inner wall of the washing bin (2), and the rotating machine (17) corresponds to the rotating shaft (18).

3. The integrated device for multi-size screening and cleaning of recycled aggregate according to claim 2 is characterized in that: The base (20) is connected to the front end of the material washing bin (2) via a tenon (6) and a tenon groove (7), and the base (20) is connected to the rear end of the material washing bin (2) via a cylindrical hinge (21).

4. The method for using the integrated device for multi-size screening and cleaning of recycled aggregate according to claim 3 comprises the following steps: S1, firstly, add water through the water injection port (3) until the rotating shaft (18) is submerged in water; S2, before using the machine, the rotating bolt (10) is rotated in advance to displace the metal ring (13) in the smooth round rod (12), and the spacing between the rigid bars (14) is adjusted. After obtaining a suitable sieve hole size, the position of the rigid bars (14) is limited by a limiting mechanism; S3, after the size of the sieve hole is determined, the recycled aggregate is added into the screening bin (16), and at this time, the vibration switch (4) is turned on to control the cyclic extension and retraction of the telescopic rod (9) to achieve the up and down vibration of the screening bin (16), and the elastic support member (8) outside the telescopic rod (9) causes the screening bin (16) to continuously vibrate up and down, recovering kinetic energy, and screening the aggregate with a suitable particle size into the washing bin (2); S4, then turning on the cleaning power switch (5) to drive the rotating machine (17) to rotate through the power supply, driving the rotating shaft (18) and the nylon cloth (19) to rotate in the water, thereby completing the cleaning of the recycled aggregate; S5. After cleaning is completed, loosen the drain valve (1), and pull open the tenon (6) after the water has drained away, so that the base (20) can be unloaded under the rotation of the cylindrical hinge (21).

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