Stirring device

Abstract

The utility model belongs to the technical field of stirrers, and discloses a stirring device which comprises a stirring tank, a first driving mechanism and at least two first stirring mechanisms, the first stirring mechanism comprises a first stirring shaft and a first stirring paddle, the first stirring paddle rotates around the first stirring shaft, and the first stirring paddle extends to the bottom of the stirring cavity from the top of the stirring cavity. The first stirring paddle comprises a first helical ribbon paddle and a first flat blade paddle, the top and the bottom of the first helical ribbon paddle are connected to the first stirring shaft, the first helical ribbon paddle is spirally wound around the first stirring shaft, the two ends of the first flat blade paddle are connected to the middle of the first helical ribbon paddle and the first stirring shaft, and the first flat blade paddle and the first stirring shaft are arranged at an angle. The first driving mechanism can drive the first stirring shaft to rotate. The stirring device can fully mix materials and prevent the materials from being accumulated at the top of the stirring cavity, so that the mixing effect of the materials and the smooth degree of discharging are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mixers, and in particular to a stirring device. Background Art

[0002] Biomass enzymatic hydrolysis technology is a biotechnology that uses enzyme catalysis to convert biomass into valuable products. In biomass enzymatic hydrolysis technology, enzymes act on substrates (such as cellulose, hemicellulose, etc.) to degrade them into small molecules (such as monosaccharides, oligosaccharides, etc.), which can be further converted into bioenergy (such as bioethanol, biohydrogen, etc.), biomaterials (such as bioplastics, biofibers, etc.) and other high value-added products. It has the advantages of high efficiency, environmental protection, and sustainability. It has broad application prospects in the fields of bioenergy, biomaterials, biochemical engineering, etc., and has made great contributions to promoting sustainable development and green production.

[0003] The implementation of biomass enzymatic hydrolysis technology requires corresponding equipment and technical support. At present, there are a variety of enzymatic hydrolysis equipment to choose from, among which the more commonly used is the vertical spiral ribbon stirring device. However, due to the low density and high solidity of straw biomass, in the early stage of biomass enzymatic hydrolysis reaction, when the ordinary vertical spiral ribbon stirring device stirs the solid material, the material is stirred to the top of the reactor and will not move downward by gravity or stirring, resulting in low stirring efficiency or even no mixing effect.

[0004] Therefore, a stirring device is urgently needed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a stirring device which can improve the mixing effect of solid materials in a vertical container and the smoothness of discharging the materials.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A stirring device is provided, comprising:

[0008] A stirring tank, wherein the stirring tank forms a stirring chamber, and a feed inlet is arranged on a side wall of the stirring chamber;

[0009] at least two first stirring mechanisms, wherein the first stirring mechanism comprises a first stirring shaft and a first stirring paddle, the first stirring paddle rotates around the first stirring shaft, and the first stirring paddle extends from the top of the stirring chamber to the bottom of the stirring chamber;

[0010] The first stirring paddle comprises a first ribbon paddle and a first flat-blade paddle, the top and bottom of the first ribbon paddle are connected to the first stirring shaft, and the first ribbon paddle is spirally wound on the first stirring shaft, and both ends of the first flat-blade paddle are connected to the middle of the first ribbon paddle and the first stirring shaft, and the first flat-blade paddle is arranged at an angle to the first stirring shaft;

[0011] The first driving mechanism comprises a first driving member and a driving shaft, the first driving member controls the rotation of the driving shaft, and the first stirring shaft is parallel to the driving shaft and is rotationally connected to the driving shaft.

[0012] As an optional solution of the stirring device, the first driving mechanism further includes a connecting plate, the connecting plate is connected to the driving shaft, and the first stirring shaft is rotatably connected to the connecting plate.

[0013] As an optional solution of the stirring device, the first driving mechanism also includes a first driving gear, which is connected to the driving shaft, and the first stirring mechanism also includes a first driven gear, which is connected to the first stirring shaft, and the first driving gear is meshed with the first driven gear.

[0014] As an optional scheme of the stirring device, the stirring device also includes a second stirring mechanism, the second stirring mechanism includes a second stirring shaft and a second stirring paddle, the second stirring paddle is connected to the bottom of the second stirring shaft and rotates around the second stirring shaft, the second stirring shaft is parallel to the driving shaft and is rotationally connected to the driving shaft.

[0015] As an optional solution for the stirring device, the second stirring paddle is a hollow annular blade.

[0016] As an optional solution for the stirring device, the first driving mechanism also includes a second driving gear, the second driving gear is connected to the driving shaft, the second stirring mechanism also includes a second driven gear, the second driven gear is connected to the second stirring shaft, and the second driving gear is meshed with the second driven gear.

[0017] As an optional solution of the stirring device, the stirring device further includes a side wall scraper, which is rotatably connected to the driving shaft and is used to scrape off materials adhered to the side wall of the stirring chamber.

[0018] As an optional solution of the stirring device, the first stirring mechanism also includes a bottom wall scraper, which is connected to the first stirring paddle and the bottom of the first stirring shaft, and is used to scrape off materials adhered to the bottom wall of the stirring chamber.

[0019] As an optional solution of the stirring device, the stirring device further includes a feeding mechanism, and the output end of the feeding mechanism is connected to the feeding port.

[0020] As an optional scheme for the stirring device, the feeding mechanism includes a second driving motor, a conveying pipe and a spiral blade, the output end of the second driving motor is connected to the spiral blade, the spiral blade is located in the conveying pipe, an inlet is provided on the side wall of the conveying pipe, the outlet of the conveying pipe is connected to the feed port of the stirring tank, and the spiral blade rotates under the drive of the second driving motor.

[0021] Beneficial effects of the utility model:

[0022] The utility model provides a stirring device, which utilizes a first driving mechanism to drive a first stirring paddle to rotate around a first stirring shaft in a stirring chamber, the first stirring paddle extends from the top of the stirring chamber to the bottom of the stirring chamber, and can stir and mix the solid material rising to the top of the stirring chamber, the first flat-blade paddle can stir the material in the middle of the stirring chamber, and by arranging the first flat-blade paddle and the first stirring shaft at an angle, the first flat-blade paddle generates a strong stirring effect in the stirring chamber when rotating around the first stirring shaft, realizes a complex motion trajectory, and can fully mix the material and push the solid material in the stirring chamber downward, prevent the material from accumulating at the top of the stirring chamber, so that the material can be fully mixed in a short time, improve the mixing effect of the material and the smoothness of the discharge, and further improve the efficiency of the biomass enzymatic hydrolysis reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a partial structural schematic diagram of the stirring device provided by the utility model;

[0024] Figure 2 It is a structural schematic diagram of the first stirring mechanism, the second stirring mechanism and the side wall scraper of the stirring device provided by the utility model;

[0025] Figure 3 It is a structural schematic diagram of the side wall scraper of the stirring device provided by the utility model;

[0026] Figure 4 It is a schematic diagram of the overall structure of the stirring device provided by the utility model.

[0027] In the figure:

[0028] 1. Mixing tank; 11. Part 1; 12. Part 2;

[0029] 2. first stirring mechanism; 21. first stirring shaft; 22. first stirring paddle; 221. first ribbon paddle; 222. first flat-blade paddle; 23. bottom wall scraper; 24. first driven gear;

[0030] 3. First driving mechanism; 31. First driving member; 311. First driving motor; 312. Speed ​​reducer; 32. Driving shaft; 33. Connecting plate; 34. First driving gear; 35. Second driving gear;

[0031] 4. second stirring mechanism; 41. second stirring shaft; 42. second stirring paddle; 43. second driven gear;

[0032] 5. Side wall scraper;

[0033] 6. Feeding mechanism; 61. Second driving motor; 62. Conveying pipeline; 63. Spiral blade. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] like Figures 1 to 4 As shown, the stirring device of this embodiment includes a stirring tank 1, a first driving mechanism 3 and at least two first stirring mechanisms 2, the stirring tank 1 forms a stirring chamber, and the side wall of the stirring chamber is provided with a feed port. The first stirring mechanism 2 includes a first stirring shaft 21 and a first stirring paddle 22, the first stirring paddle 22 rotates around the first stirring shaft 21, and the first stirring paddle 22 extends from the top of the stirring chamber to the bottom of the stirring chamber. Among them, the first stirring paddle 22 includes a first ribbon paddle 221 and a first flat blade paddle 222, the top and bottom of the first ribbon paddle 221 are connected to the first stirring shaft 21, and the first ribbon paddle 221 is spirally wound on the first stirring shaft 21, and the first flat blade paddle 222 is connected to the middle of the first ribbon paddle 221 and the first stirring shaft 21 at both ends, and the first flat blade paddle 222 is set at an angle with the first stirring shaft 21. The first driving mechanism 3 includes a first driving member 31 and a driving shaft 32, the first driving member 31 controls the rotation of the driving shaft 32, and all first stirring shafts 21 are parallel to the driving shaft 32 and are rotatably connected to the driving shaft 32.

[0039] Based on the above design, the stirring device uses a first driving mechanism 3 to drive at least two first stirring paddles 22 to rotate around the first stirring shaft 21 in the stirring chamber. The first stirring paddle 22 extends from the top of the stirring chamber to the bottom of the stirring chamber, and can stir and mix the solid material inside the stirring chamber in all directions. The first flat-blade paddle 222 can stir the material in the middle of the stirring chamber, and by setting the first flat-blade paddle 222 at an angle to the first stirring shaft 21, the first flat-blade paddle 222 generates a strong stirring effect in the stirring chamber when rotating around the first stirring shaft 21, realizing a complex motion trajectory, being able to fully mix the material, and being able to push the solid material in the stirring chamber downward to prevent the material from accumulating at the top of the stirring chamber, so that the material can be fully mixed in a short time, thereby improving the mixing effect of the material and the smoothness of the discharge, and further improving the efficiency of the biomass enzymatic hydrolysis reaction.

[0040] It should be noted that, in the present embodiment, two first stirring mechanisms 2 are provided, and the two first stirring mechanisms 2 constitute a double stirring mechanism. By utilizing the mutual cooperation of the double stirring mechanisms, the space utilization rate in the stirring chamber is greatly increased, and the mixing efficiency is sharply increased. In addition, in the present embodiment, each first stirring device 2 includes two first stirring paddles 22, and the two first stirring paddles 22 are relatively distributed on both sides of the first stirring shaft 21, so as to improve the utilization rate of the stirring chamber and the stirring efficiency; of course, in some other embodiments, the first stirring device 2 can also be provided with one, three, four, etc. first stirring paddles 22, which can be adjusted according to actual conditions.

[0041] Reference Figure 1 The first driving member 31 includes a first driving motor 311 and a reduction box 312. The first driving motor 311 is connected to the reduction box 312 and the driving shaft 32 in sequence, so that the power output by the first driving motor 311 is transmitted to the driving shaft 32 to realize the rotation of the driving shaft 32. The first driving motor 311 and the reduction box 312 are both prior arts and will not be described in detail here.

[0042] Furthermore, the first driving mechanism 3 further includes a connecting plate 33, the connecting plate 33 is connected to the driving shaft 32, and the first stirring shaft 21 is rotatably connected to the connecting plate 33. When the driving shaft 32 rotates, the driving shaft 32 can drive the connecting plate 33 to rotate, thereby driving the first stirring shaft 21 to move, and realizing the rotation of the first stirring shaft 21 around the driving shaft 32. Preferably, a protruding structure extending upward is provided on the edge of the connecting plate 33, and the protruding structure forms a cylindrical protective space, which can protect the parts connected to the connecting plate 33.

[0043] Furthermore, the first driving mechanism 3 also includes a first driving gear 34, which is connected to the driving shaft 32. The first stirring mechanism 2 also includes a first driven gear 24, which is connected to the first stirring shaft 21. The first driving gear 34 is meshed with the first driven gear 24. When the first stirring shaft 21 rotates around the driving shaft 32, the first driving gear 34 can drive the first driven gear 24 to rotate, thereby realizing the self-rotation of the first stirring shaft 21. Combined with the rotation of the first stirring paddle 22 around the first stirring shaft 21, the first stirring paddle 22 can generate a strong stirring effect in the stirring chamber, increase the extrusion and friction between the material particles, so that the material can be fully mixed in a short time, and the mixing effect is improved.

[0044] Preferably, the first stirring paddle 22 includes a plurality of first flat blade paddles 222, which are evenly distributed from top to bottom on the first stirring shaft 21, and can push the material in the stirring chamber downward layer by layer during stirring, thereby accelerating the material transfer speed and improving the stirring efficiency. Optionally, the angle between the first flat blade paddle 222 and the first stirring shaft 21 is 30°, 45°, 60°, etc.

[0045] Furthermore, the first stirring mechanism 2 also includes a bottom wall scraper 23, which is connected to the first stirring paddle 22 and the bottom of the first stirring shaft 21. The bottom wall scraper 23 is used to scrape off the material adhering to the bottom wall of the stirring chamber, prevent the material from adhering to the bottom wall of the container, effectively scrape off the material adhering to the bottom wall, and ensure that the material is fully mixed in the stirring chamber. Preferably, the bottom wall scraper 23 is a polytetrafluoroethylene soft plate, and a gap of 1mm-2mm is left between the bottom wall scraper 23 and the bottom wall of the stirring chamber to prevent the bottom wall scraper 23 from getting stuck on the bottom wall of the stirring chamber, thereby ensuring the reliability of the first stirring mechanism 2.

[0046] For biomass materials, the materials are decomposed in the late stage of enzymatic hydrolysis to generate viscous liquid substances. The materials will be decomposed into small particles. After stirring and squeezing, the materials will adhere to the wall and bottom of the container to form a material layer, which makes the stirring and mixing effect worse. Figure 2 and Figure 3 , the stirring device also includes a side wall scraper 5, which is rotatably connected to the drive shaft 32, and the side wall scraper 5 is used to scrape off the material adhering to the side wall of the stirring chamber. Specifically, the side wall scraper 5 is connected to the connecting plate 33, and the driving shaft 32 drives the side wall scraper 5 to rotate through the connecting plate 33, which can scrape the material off the side wall of the stirring chamber, so that the material can return to the stirring range, enhance the stirring effect, and reduce the material loss caused by stirring. Preferably, the side wall scraper 5 is a polytetrafluoroethylene soft plate, and a gap of 1mm-2mm is left between the side wall scraper 5 and the side wall of the stirring chamber to prevent the side wall scraper 5 from getting stuck on the side wall of the stirring chamber, thereby ensuring the reliability of the stirring device. In addition, the side wall scraper 5 and the first flat blade paddle 222 form a downward driving force to provide driving force for material discharge, thereby resisting the turbulent zone at the discharge port of the stirring tank 1, so that the material discharge is smooth and rapid.

[0047] During biomass enzymolysis, the state of the material changes greatly. At the beginning, the material is in a pure solid state. At this time, the first stirring mechanism 2 and the side wall scraper 5 are used to achieve a good stirring effect. In the late stage of the biomass enzymolysis reaction, the state of the material changes and becomes a solid-liquid mixed state. Only the first stirring mechanism 2 and the side wall scraper 5 are used, and the stirring and mixing effect decreases, affecting the work efficiency. Therefore, the stirring device also includes a second stirring mechanism 4, and the second stirring mechanism 4 includes a second stirring shaft 41 and a second stirring paddle 42. The second stirring paddle 42 is connected to the bottom of the second stirring shaft 41 and rotates around the second stirring shaft 41. The second stirring shaft 41 is parallel to the drive shaft 32 and is rotationally connected to the drive shaft 32. The second stirring mechanism 41 only stirs the material in the solid-liquid mixed state at the bottom of the stirring chamber, which can improve the reaction efficiency of the late stage of biomass enzymolysis.

[0048] Specifically, the second stirring shaft 41 is connected to the connecting plate 33, so that the second stirring shaft 41 can rotate around the driving shaft 32. The first driving mechanism 3 also includes a second driving gear 35, and the second driving gear 35 is connected to the driving shaft 32. The second stirring mechanism 4 also includes a second driven gear 43, and the second driven gear 43 is connected to the second stirring shaft 41. The second driving gear 35 is meshed with the second driven gear 43. When the second stirring shaft 41 rotates around the driving shaft 32, the second driving gear 35 can drive the second driven gear 43 to rotate, thereby realizing the self-rotation of the second stirring shaft 41.

[0049] Preferably, the second stirring paddle 42 is an annular blade, which can reduce the resistance caused by solid materials in the solid-liquid mixed material, increase the stirring speed, quickly stir and mix, and improve the stirring effect and biomass enzymatic hydrolysis reaction rate.

[0050] like Figure 4 As shown, the mixing tank 1 includes a first part 11 and a second part 12, the first part 11 is located below the second part 12, the first part 11 forms a mixing chamber for mixing materials, and the second part 12 forms a transmission space, which is used to accommodate transmission parts. Specifically, the drive shaft 22, the first drive gear 34, the second drive gear 35, the first driven gear 24, and the second driven gear 43 are located in the transmission space, and the connecting plate 33 can separate the mixing chamber and the transmission space, thereby isolating the transmission parts from the materials and the external space to ensure the effectiveness of the power transmission. Optionally, the mixing tank 1 can also be provided with casters, which are connected to the bottom of the first part 11 to facilitate the movement of the mixing tank 1.

[0051] Furthermore, the stirring device also includes a feeding mechanism 6, and the output end of the feeding mechanism 6 is connected to the feeding port. For biomass materials, after being crushed, they are in the form of long strips and powders. The long strips are interwoven with each other, and the powdered materials fill the gaps to strengthen the stability of the long fiber interwoven structure. In this way, if the material addition speed is not well controlled under the action of gravity alone, the materials begin to partially accumulate, and new materials are continuously transported. The long fibers of the transported materials are inserted into the accumulated part, and the powdered materials strengthen the structure, and the pipeline will soon be blocked by the materials. By setting the feeding mechanism 6, the material is pushed into the stirring tank 1 by mechanical force, thereby avoiding the phenomenon of feed blockage.

[0052] Specifically, the feeding mechanism 6 includes a second driving motor 61, a conveying pipe 62 and a spiral blade 63. The output end of the second driving motor 61 is connected to the spiral blade 63. The spiral blade 63 is located in the conveying pipe 62. An inlet is provided on the side wall of the conveying pipe 62, and the outlet of the conveying pipe 62 is connected to the feed port of the mixing tank 1. The spiral blade 63 rotates under the drive of the second driving motor 61. The material enters the conveying pipe 62 from the inlet, and the spiral blade 63 pushes the material to the outlet and enters the feed port to realize the feeding of the mixing tank 1. In addition, the squeezing of the spiral blade 62 will compress the fluffy material, increase the density of the material, and increase the filling amount of the material.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A stirring device, characterized in that: include: A stirring tank (1), wherein the stirring tank (1) forms a stirring chamber, and a feed inlet is arranged on a side wall of the stirring chamber; at least two first stirring mechanisms (2), wherein the first stirring mechanism (2) comprises a first stirring shaft (21) and a first stirring paddle (22), wherein the first stirring paddle (22) rotates around the first stirring shaft (21), and the first stirring paddle (22) extends from the top of the stirring chamber to the bottom of the stirring chamber; The first stirring paddle (22) comprises a first ribbon paddle (221) and a first flat-blade paddle (222); the top and bottom of the first ribbon paddle (221) are connected to the first stirring shaft (21), and the first ribbon paddle (221) is spirally wound on the first stirring shaft (21); two ends of the first flat-blade paddle (222) are connected to the middle of the first ribbon paddle (221) and the first stirring shaft (21); the first flat-blade paddle (222) is arranged at an angle to the first stirring shaft (21); A first driving mechanism (3), wherein the first driving mechanism (3) comprises a first driving member (31) and a driving shaft (32), wherein the first driving member (31) controls the rotation of the driving shaft (32), and all the first stirring shafts (21) are parallel to the driving shaft (32) and are rotationally connected to the driving shaft (32).

2. The stirring device according to claim 1, characterized in that: The first driving mechanism (3) further comprises a connecting plate (33), wherein the connecting plate (33) is connected to the driving shaft (32), and the first stirring shaft (21) is rotatably connected to the connecting plate (33).

3. The stirring device according to claim 1, characterized in that: The first driving mechanism (3) further comprises a first driving gear (34), wherein the first driving gear (34) is connected to the driving shaft (32); the first stirring mechanism (2) further comprises a first driven gear (24), wherein the first driven gear (24) is connected to the first stirring shaft (21), and the first driving gear (34) is meshed with the first driven gear (24).

4. The stirring device according to claim 1, characterized in that: The stirring device further comprises a second stirring mechanism (4), the second stirring mechanism (4) comprising a second stirring shaft (41) and a second stirring paddle (42), the second stirring paddle (42) being connected to the bottom of the second stirring shaft (41) and rotating around the second stirring shaft (41), the second stirring shaft (41) being parallel to the driving shaft (32) and being rotationally connected to the driving shaft (32).

5. The stirring device according to claim 4, characterized in that: The second stirring paddle (42) is an annular blade.

6. The stirring device according to claim 4, characterized in that: The first driving mechanism (3) further comprises a second driving gear (35), wherein the second driving gear (35) is connected to the driving shaft (32); the second stirring mechanism (4) further comprises a second driven gear (43), wherein the second driven gear (43) is connected to the second stirring shaft (41); and the second driving gear (35) is meshed with the second driven gear (43).

7. The stirring device according to claim 1, characterized in that: The stirring device further comprises a side wall scraper (5), wherein the side wall scraper (5) is rotatably connected to the driving shaft (32), and the side wall scraper (5) is used to scrape off materials adhered to the side wall of the stirring chamber.

8. The stirring device according to claim 1, characterized in that: The first stirring mechanism (2) further comprises a bottom wall scraper (23), wherein the bottom wall scraper (23) is connected to the first stirring paddle (22) and the bottom of the first stirring shaft (21), and the bottom wall scraper (23) is used to scrape off materials adhered to the bottom wall of the stirring chamber.

9. The stirring device according to claim 1, characterized in that: The stirring device further comprises a feeding mechanism (6), the output end of the feeding mechanism (6) being connected to the feeding port.

10. The stirring device according to claim 9, characterized in that: The feeding mechanism (6) comprises a second driving motor (61), a conveying pipe (62) and a spiral blade (63); the output end of the second driving motor (61) is connected to the spiral blade (63); the spiral blade (63) is located in the conveying pipe (62); an inlet is provided on the side wall of the conveying pipe (62); the outlet of the conveying pipe (62) is connected to the feeding port of the stirring tank (1); and the spiral blade (63) rotates under the drive of the second driving motor (61).

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