A chemical desulfurization device for thermal power plants

Abstract

The present invention relates to the technical field of thermal power plants, and in particular to a chemical desulfurization device for thermal power plants, a stirring mechanism comprising a transmission mechanism, wherein the stirring mechanism is provided on one side of the transmission mechanism, a centrifugal component is connected to one side of the transmission mechanism, and an opening and closing component is provided at the bottom of the centrifugal component; an equipment mechanism comprising a device body arranged outside the transmission mechanism, a water inlet funnel is provided on the top of the device body, the stirring component and the centrifugal component are driven to rotate by the transmission component, and the stirring component and the centrifugal component are rotated in opposite directions, so that the mixing efficiency is better, and as the speed increases, under the action of centrifugal force, the centrifugal ball will gradually rise, and the desulfurizer will start to be discharged, and in the case of intermittent collision between the stirring rod and the extrusion rod, the desulfurizer is intermittently discharged, and under the action of the opening and closing component, when the centrifugal ball rises to near the top, the water outlet starts to open, and when the centrifugal ball rises to the top, the water outlet is fully opened.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power plants, and in particular to a chemical desulfurization device for thermal power plants. Background Art

[0002] Desulfurization technology for thermal power plant wastewater is a common pollution control measure. Its main purpose is to remove sulfides from wastewater to reduce its impact on the environment. Traditional desulfurization technologies mainly include oxidation, reduction, adsorption, and biological methods. Adsorption, especially activated carbon, has become one of the main methods for desulfurization of thermal power plant wastewater due to its low cost and ease of operation. However, it suffers from problems such as limited adsorption capacity and difficulty in regeneration. Biological desulfurization is a new desulfurization technology developed in recent years. It uses microbial metabolism to convert sulfides in wastewater into sulfates, which are then removed from the wastewater through precipitation or filtration. This method is characterized by simple operation, low cost, and environmental friendliness. However, its limitation lies in its narrow scope of application. The existing desulfurization methods using desulfurizers have low mixing efficiency and low work efficiency. Summary of the Invention

[0003] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0004] In view of the above problems existing in the existing chemical desulfurization devices of thermal power plants, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a chemical desulfurization device for a thermal power plant, the purpose of which is to improve the mixing efficiency of wastewater desulfurization.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising: a stirring mechanism comprising a transmission mechanism, a stirring mechanism being provided on one side of the transmission mechanism, a centrifugal component being connected to one side of the transmission mechanism, and an opening and closing component being provided on the bottom of the centrifugal component; and

[0007] The equipment mechanism comprises a device body arranged outside the transmission mechanism, a water inlet funnel is arranged on the top of the device body, and a chemical box is also arranged on the top of the device body.

[0008] As a preferred solution of the chemical desulfurization device for a thermal power plant according to the present invention, the transmission mechanism includes a drive shaft, a limiting groove is provided on the outer surface of the drive shaft, and a first bevel gear is fixedly connected to the outer surface of the drive shaft.

[0009] As a preferred solution of the chemical desulfurization device for a thermal power plant according to the present invention, a transmission member is provided on one side of the first bevel gear, the transmission member includes a support frame and a second bevel gear, and the second bevel gear rotates in the support frame.

[0010] As a preferred solution of the chemical desulfurization device of a thermal power plant according to the present invention, one side of the second bevel gear is meshedly connected with a third bevel gear, a limiting block is provided inside the third bevel gear, and the limiting block is rotatably connected in the limiting groove.

[0011] As a preferred solution of the chemical desulfurization device of the thermal power plant described in the present invention, the stirring component includes a connecting rod, which is fixed on both sides of the third bevel gear, a stirring rod is provided at one end of the connecting rod, and a stirring block is provided on one side of the connecting rod.

[0012] As a preferred solution of the chemical desulfurization device of a thermal power plant according to the present invention, the centrifugal component includes a sliding block, which is slidably connected to the outer side of the drive shaft, a traction rod is provided at the bottom of the sliding block, and a traction block is provided at the bottom of the traction rod.

[0013] As a preferred solution of the chemical desulfurization device of the thermal power plant described in the present invention, wherein: the two sides of the sliding block are hinged with hinged rods, one side of the hinged rod is hinged with a long rod, one side of the long rod is hinged with a top block, an extrusion rod is arranged inside the long rod, a spring is arranged on the outside of the extrusion rod, and a block is arranged on one side of the extrusion rod.

[0014] As a preferred solution of the chemical desulfurization device for a thermal power plant of the present invention, a centrifugal ball is provided on one side of the long rod, a circular hole is provided through the centrifugal ball, and a discharge port is provided on one side of the long rod.

[0015] As a preferred solution of the chemical desulfurization device of a thermal power plant described in the present invention, the opening and closing component includes a rising rod, the rising rod is arranged on one side of the sliding block, a long block is provided on the top of the rising rod, teeth are provided on one side of the rising rod, a transmission gear is provided on one side of the rising rod, a top rod is provided on one side of the transmission gear, an opening and closing plate is provided on one side of the top rod, an opening is provided through one side of the opening and closing plate, a limiting member is provided on the outer side of the rising rod, and a spring is provided on one side of the limiting member.

[0016] As a preferred solution of the chemical desulfurization device for a thermal power plant according to the present invention, a top plate is provided on the top of the device body, a bottom plate is provided on the bottom of the device body, a water outlet is provided through one side of the bottom plate, the water outlet is connected to a drain pipe, and a support column is provided at the bottom of the bottom plate.

[0017] The beneficial effects of the present invention are as follows: the stirring component and the centrifugal component are driven to rotate by the transmission component, and the rotation directions of the stirring component and the centrifugal component are opposite, so that the mixing efficiency is better, and as the speed increases, under the action of centrifugal force, the centrifugal ball will gradually rise, and the desulfurizer begins to be discharged, and under the intermittent collision of the stirring rod and the extrusion rod, the desulfurizer is discharged intermittently, and under the action of the opening and closing component, when the centrifugal ball rises to near the top, the water outlet begins to open, and when the centrifugal ball rises to the top, the water outlet is fully opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

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

[0020] Figure 2 This is a schematic diagram of the internal structure provided by the present invention.

[0021] Figure 3 This is a schematic diagram of another perspective structure provided by the present invention.

[0022] Figure 4 This is a schematic diagram of the centrifugal structure provided by the present invention.

[0023] Figure 5 This is a schematic diagram of the cooperation between the drive shaft and the third bevel gear provided by the present invention.

[0024] Figure 6 This is a schematic diagram of the coordination of the opening and closing component and the centrifugal component provided by the present invention.

[0025] Figure 7 This is a schematic diagram of the opening and closing components provided by the present invention.

[0026] Figure 8 This is a schematic diagram from another perspective provided by the present invention. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0030] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0031] Example 1

[0032] Reference Figures 2 to 8 , which is the first embodiment of the present invention, provides a chemical desulfurization device for a thermal power plant. The device includes a stirring mechanism 100, which achieves a better mixing effect by rotating in opposite directions.

[0033] The stirring mechanism 100 includes a transmission mechanism 101, a stirring mechanism 102 is provided on one side of the transmission mechanism 101, a centrifugal component 103 is connected to one side of the transmission mechanism 101, and an opening and closing component 104 is provided at the bottom of the centrifugal component 103; and

[0034] The transmission mechanism 101 includes a driving shaft 101 a . A limiting groove 101 a - 1 is provided on the outer surface of the driving shaft 101 a . A first bevel gear 101 b is fixedly connected to the outer surface of the driving shaft 101 a .

[0035] Furthermore, the drive shaft 101a rotates under the action of the motor, and since the first bevel gear 101b and the drive shaft 101a are fixedly connected, when the drive shaft 101a rotates, the first bevel gear 101b also rotates synchronously with the drive shaft 101a.

[0036] A transmission member 101c is provided on one side of the first bevel gear 101b. The transmission member 101c includes a support frame 101c-1 and a second bevel gear 101c-2. The second bevel gear 101c-2 rotates in the support frame 101c-1.

[0037] Furthermore, two groups of transmission members 101c are provided, and a circular ring is provided on the top of the support frame 101c-1 to facilitate the rotation of the second bevel gear 101c-2 in the support frame 101c-1 and to limit the second bevel gear 101c-2. Since the second bevel gear 101c-2 and the first bevel gear 101b are meshingly connected, the second bevel gear 101c-2 and the first bevel gear 101b rotate synchronously.

[0038] One side of the second bevel gear 101c-2 is meshedly connected with the third bevel gear 101d. A limiting block 101d-1 is provided inside the third bevel gear 101d. The limiting block 101d-1 is rotatably connected in the limiting groove 101a-1.

[0039] Furthermore, the third bevel gear 101d and the second bevel gear 101c-2 are meshingly connected. Due to the rotational cooperation of the limit block 101d-1 and the limit groove 101a-1, the third bevel gear 101d and the drive shaft 101a are rotationally connected. Therefore, the third bevel gear 101d rotates under the drive of the second bevel gear 101c-2, and the rotation directions of the third bevel gear 101d and the drive shaft 101a are opposite, that is, the rotation directions of the third bevel gear 101d and the first bevel gear 101b are opposite.

[0040] Example 2

[0041] Reference Figures 2 to 8 , is the second embodiment of the present invention, which is different from the first embodiment in that:

[0042] This embodiment also provides a stirring component 102, a centrifugal component 103 and an opening and closing component 104.

[0043] The stirring component 102 includes a connecting rod 102a, which is fixedly provided on both sides of the third bevel gear 101d. A stirring rod 102b is provided at one end of the connecting rod 102a, and a stirring block 102c is provided on one side of the connecting rod 102a.

[0044] Furthermore, since two sets of connecting rods 102a are provided and the connecting rods 102a and the third bevel gear 101d are fixedly connected, the connecting rods 102a and the third bevel gear 101d rotate synchronously, so the stirring rod 102b and the stirring block 102c also rotate synchronously.

[0045] The centrifugal component 103 includes a sliding block 103a, which is slidably connected to the outside of the driving shaft 101a. A traction rod 103a-1 is provided at the bottom of the sliding block 103a, and a traction block 103a-2 is provided at the bottom of the traction rod 103a-1.

[0046] The sliding block 103a is hinged with a hinged rod 103b on both sides, and a long rod 103c is hinged on one side of the hinged rod 103b. A top block 103d is hinged on one side of the long rod 103c. An extrusion rod 103e is arranged inside the long rod 103c, and a spring 103e-1 is arranged on the outside of the extrusion rod 103e. A block 103e-2 is arranged on one side of the extrusion rod 103e. A centrifugal ball 103c-1 is arranged on one side of the long rod 103c. A circular hole 103c-1a is provided through the centrifugal ball 103c-1, and a discharge port 103c-2 is arranged on one side of the long rod 103c.

[0047] Furthermore, as the rotation speed of the driving shaft 101a increases, the long rod 103c begins to deflect upward under the action of the centrifugal force, so that the sliding block 103a continues to slide upward under the action of the hinge rod 103b. As the centrifugal force continues to increase, the squeezing rod 103e begins to squeeze the spring 103e-1 and extends. The deflection of the squeezing rod 103e causes the block 103e-2 to deflect, thereby causing the discharge port 103c-2, which was originally blocked by the block 103e-2, to be opened. Open to allow the desulfurizer to be discharged. Moreover, because the stirring rod 102b and the drive shaft 101a are in opposite directions, the stirring rod 102b and the extrusion rod 103e will begin to collide intermittently. Each collision will reset the stirring rod 102b once, and the block 103e-2 will block the discharge port 103c-2 once, thereby preventing excessive outflow of the desulfurizer, and the centrifugal component will also have a stirring effect on the mixed liquid, so that the centrifugal component and the stirring component have opposite directions to obtain a better mixing effect.

[0048] The opening and closing component 104 includes a rising rod 104a, which is arranged on one side of the sliding block 103. A long block 104a-1 is provided on the top of the rising rod 104a, and teeth 104a-2 are provided on one side of the rising rod 104a. A transmission gear 104b is provided on one side of the rising rod 104a, and a top rod 104c is provided on one side of the transmission gear 104b. An opening and closing plate 104c-1 is provided on one side of the top rod 104c, and an opening 104c-2 is provided through one side of the opening and closing plate 104c-1. A limiting member 104d is provided on the outer side of the rising rod 104a, and a spring 104e is provided on one side of the limiting member 104d.

[0049] Furthermore, a traction rod 103a-1 is provided at the bottom of the sliding block 103, and a traction block 103a-2 is provided at the bottom of the traction rod 103a-1. Due to the rise of the sliding block 103, the traction rod 103a-1 and the traction block 103a-2 begin to rise. Moreover, a long block 104a-1 is provided at the top of the rising rod 104a. Due to the cooperation between the traction block 103a-2 and the long block 104a-1, the rising rod 104a will be driven to rise, and the teeth 104a-2 and the transmission gear 104b provided on one side of the rising rod 104a cooperate with each other, so that the transmission gear 104b starts to rotate due to the rising effect of the rising rod 104a, and the rotation of the transmission gear 104b drives the top rod 104c to move to one side, and then the opening and closing plate 104c-1 moves to one side.

[0050] The remaining structures are the same as those of Example 1.

[0051] Example 3

[0052] Reference Figures 1 to 8 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: this embodiment provides a chemical desulfurization device for a thermal power plant, so that the wastewater generated in the thermal power plant and the desulfurizer can be fully mixed, thereby improving work efficiency.

[0053] The device mechanism 200 includes a device body 201 disposed outside the transmission mechanism 101 , a water inlet funnel 202 is disposed on the top of the device body 201 , and a chemical box 203 is also disposed on the top of the device body 201 .

[0054] A top plate 201a is provided on the top of the device body 201, and a bottom plate 201b is provided on the bottom of the device body 201. A water outlet 201b-1 is provided through one side of the bottom plate 201b, and the water outlet 201b-1 is connected to the drain pipe 204. A support column 205 is provided at the bottom of the bottom plate 201b.

[0055] When the staff uses this device, they first inject the wastewater that needs to be desulfurized through the water inlet funnel 202, and then turn on the motor to drive the transmission mechanism 101 to start transmission. The driving shaft 101a rotates under the action of the motor, and since the first bevel gear 101b and the driving shaft 101a are fixedly connected, when the driving shaft 101a rotates, the first bevel gear 101b will also rotate synchronously with the driving shaft 101a. The transmission member 101c is provided with two groups, and a circular ring is provided on the top of the support frame 101c-1 to facilitate the second bevel gear 101c-2 to rotate in the support frame 101c-1, and the second bevel gear 101c-2 is limited to prevent the second bevel gear 101c-2 from deviating. The occurrence of situations such as rotation falling, and since the second bevel gear 101c-2 and the first bevel gear 101b are meshingly connected, the second bevel gear 101c-2 and the first bevel gear 101b rotate synchronously, and the third bevel gear 101d and the second bevel gear 101c-2 are meshingly connected. Due to the rotation cooperation of the limit block 101d-1 and the limit groove 101a-1, the third bevel gear 101d and the drive shaft 101a are rotationally connected, so the third bevel gear 101d rotates under the drive of the second bevel gear 101c-2, and the rotation directions of the third bevel gear 101d and the drive shaft 101a are opposite, that is, the rotation directions of the third bevel gear 101d and the first bevel gear 101b are opposite and rotate synchronously.

[0056] And since the connecting rod 102a is provided with two groups, and the connecting rod 102a and the third bevel gear 101d are fixedly connected, the connecting rod 102a and the third bevel gear 101d rotate synchronously, so the stirring rod 102b and the stirring block 102c also rotate synchronously. As the rotation speed of the drive shaft 101a continues to increase, under the action of centrifugal force, the long rod 103c begins to deflect upward, so that under the action of the hinge rod 103b, the sliding block 103a continues to slide upward. As the centrifugal force continues to increase, the extrusion rod 103e begins to squeeze the spring 103e-1 and extend. Due to the offset of the extrusion rod 103e, the block 103e-2 is offset, so that the discharge port 103c-2 that was originally blocked by the block 103e-2 is opened, allowing the desulfurizer to be discharged. The desulfurizer will be continuously discharged from the chemical box 203, flowing into the cavity in the long rod 103c, and finally discharged through the discharge port 103c-2.

[0057] Furthermore, because the stirring rod 102b and the driving shaft 101a are in opposite directions, the stirring rod 102b and the extrusion rod 103e will begin to collide intermittently. Each collision will reset the stirring rod 102b, and the block 103e-2 will block the discharge port 103c-2, thereby preventing excessive outflow of the desulfurizer, and the centrifugal component will also have a stirring effect on the mixed liquid, so that the centrifugal component and the stirring component have opposite directions to obtain a better mixing effect. A traction rod 103a-1 is provided at the bottom of the sliding block 103, and a traction block 103a-2 is provided at the bottom of the traction rod 103a-1. Due to the rise of the sliding block 103, the traction rod 103a-1 and the traction block 103a-2 begin to rise. Furthermore, a long block 104a-1 is provided at the top of the rising rod 104a. Due to the cooperation of the traction block 103a-2 and the long block 104a-1, the rising rod 104a will be driven to move forward. The gear 104b is engaged with the gear 104c-2 on one side of the lifting rod 104a, thereby starting to rotate. The rotation of the gear 104b drives the top rod 104c to move to one side, and then the opening and closing plate 104c-1 moves to one side, so that when the sliding block 103a starts to slide for a distance, the opening and closing plate 104c-1 starts to move, gradually causing the opening 104c-2 and the water outlet 201b-1 to overlap, thereby starting to leak water. When the sliding block 103a rises to the top, the opening 104c-2 and the water outlet 201b-1 completely overlap, and the water discharge speed reaches the peak, thereby preventing the wastewater from being discharged before mixing begins. The discharged water will also be discharged to the next device through the drain pipe 204, thereby completely purifying the wastewater and protecting water resources.

[0058] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structures. Other replacements, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0059] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A chemical desulfurization device for a thermal power plant, characterized by: include, A stirring mechanism (100) comprises a transmission mechanism (101), a stirring component (102) being provided on one side of the transmission mechanism (101), a centrifugal component (103) being connected to one side of the transmission mechanism (101), and an opening and closing component (104) being provided at the bottom of the centrifugal component (103); and, An equipment mechanism (200) comprises a device body (201) disposed outside the transmission mechanism (101), a water inlet funnel (202) being disposed on the top of the device body (201), and a chemical box (203) being further disposed on the top of the device body (201); The transmission mechanism (101) comprises a drive shaft (101a), the outer surface of the drive shaft (101a) is provided with a limiting groove (101a-1), and the outer surface of the drive shaft (101a) is fixedly connected to a first bevel gear (101b); A transmission member (101c) is provided on one side of the first bevel gear (101b), the transmission member (101c) comprising a support frame (101c-1) and a second bevel gear (101c-2), and the second bevel gear (101c-2) rotates in the support frame (101c-1); One side of the second bevel gear (101c-2) is meshedly connected with a third bevel gear (101d), a limiting block (101d-1) is provided inside the third bevel gear (101d), and the limiting block (101d-1) is rotatably connected in the limiting groove (101a-1); The stirring component (102) comprises a connecting rod (102a), the connecting rod (102a) being fixedly arranged on both sides of the third bevel gear (101d), a stirring rod (102b) being arranged at one end of the connecting rod (102a), and a stirring block (102c) being arranged at one side of the connecting rod (102a); The centrifugal component (103) comprises a sliding block (103a), the sliding block (103a) is slidably connected to the outside of the driving shaft (101a), a traction rod (103a-1) is provided at the bottom of the sliding block (103a), and a traction block (103a-2) is provided at the bottom of the traction rod (103a-1); Both sides of the sliding block (103a) are hinged with hinged rods (103b), one side of the hinged rod (103b) is hinged with a long rod (103c), one side of the long rod (103c) is hinged with a top block (103d), an extrusion rod (103e) is provided inside the long rod (103c), a spring is provided on the outside of the extrusion rod (103e), and a block (103e-2) is provided on one side of the extrusion rod (103e); A centrifugal ball (103c-1) is provided on one side of the long rod (103c), a circular hole (103c-1a) is provided through the centrifugal ball (103c-1), and a discharge port (103c-2) is provided on one side of the long rod (103c); The opening and closing component (104) includes a rising rod (104a), the rising rod (104a) is arranged on one side of the sliding block (103a), a long block (104a-1) is arranged on the top of the rising rod (104a), a tooth (104a-2) is arranged on one side of the rising rod (104a), a transmission gear (104b) is arranged on one side of the rising rod (104a), a top rod (104c) is arranged on one side of the transmission gear (104b), an opening and closing plate (104c-1) is arranged on one side of the top rod (104c), an opening (104c-2) is provided through one side of the opening and closing plate (104c-1), a limiting member (104d) is arranged on the outer side of the rising rod (104a), and a spring is arranged on one side of the limiting member (104d); A top plate (201a) is provided on the top of the device body (201), a bottom plate (201b) is provided on the bottom of the device body (201), a water outlet (201b-1) is provided through one side of the bottom plate (201b), the water outlet (201b-1) is connected to a drainage pipe (204), and a support column (205) is provided at the bottom of the bottom plate (201b).

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