A hydraulic pump station with a self-monitoring unit

Abstract

The present invention relates to a hydraulic pump station with a self-monitoring unit applied to the field of hydraulic pumps, including a hydraulic pump station body. A temperature sensor is fixedly connected to the inner wall of the fuel tank of the hydraulic pump station body, and an irradiation lamp is fixedly connected to the inner wall of the fuel tank opposite to the temperature sensor. The temperature sensor includes a back plate, and a photosensitive sensor is fixedly connected to the side wall of the back plate. By adding a temperature sensor on the basis of the existing hydraulic pump station to monitor the temperature of the hydraulic oil in real time, the light blocking effect of the mercury column is used to measure the length of the light area, so as to obtain a control signal, and the refrigeration effect of the semiconductor refrigeration sheet is adjusted according to this control signal, so as to achieve the purpose of self-adaptive cooling following the temperature of the hydraulic oil. The telescopic length of the telescopic heat exchange cylinder is also adjusted to adjust the size of the heat exchange area, so as to effectively improve the cooling effect at high temperatures and effectively avoid the icing problem in low-temperature weather, effectively solving the problem that the existing heat dissipation is easily affected by the external environment.

Description

Technical Field

[0001] A hydraulic pump station with a self - monitoring unit involved in the present invention, particularly a hydraulic pump station with a self - monitoring unit applied to the field of hydraulic pumps. Background Art

[0002] A hydraulic pump station is the power source in a hydraulic system, mainly responsible for converting mechanical energy into hydraulic energy to provide power for the entire hydraulic system. It mainly consists of parts such as a hydraulic pump group, a temperature - control component, a fuel - tank component, an accumulator, and a filter component. Among them, the temperature - control component is the most important part, mainly used to cool the hydraulic oil to prevent the oil from deteriorating due to high temperature. However, the heat - dissipation effect of the existing temperature - control components is not good.

[0003] To solve the problem of poor heat - dissipation effect of hydraulic oil, a certain hydraulic pump station in the market adopts the design of air - cooling and water - cooling and has a certain market share.

[0004] The specification of Chinese Patent CN201910994550.2 discloses a water - evaporation physical - heat - dissipation hydraulic pump station. This hydraulic pump uses the principle of water evaporation and heat absorption to dissipate heat for the hydraulic pump station, and directly exchanges heat with the oil in the fuel tank through a heat - conducting pipe, greatly improving the efficiency of heat exchange, being able to dissipate heat from the hydraulic oil in time, not easily causing the equipment to slow down and become weak, not easily affecting the sealing performance and lubrication performance, not easily damaging important hydraulic components, having a simple structure, only requiring pure water as consumables, having a low cost, good heat - dissipation effect, and being convenient for later maintenance.

[0005] The specification of Chinese Patent CN201911105166.9 discloses a self - heat - dissipating safety fuel tank for a hydraulic pump station. This fuel tank dissipates heat outward by itself through a variety of different ways. One is to convert heat into the kinetic energy of the first heat - dissipating ball, the second heat - dissipating ball, and the third heat - dissipating ball moving when heated; the second is that heat partially evaporates the liquid contained in the first cavity, the second cavity, and the third cavity to dissipate heat; the third is to transfer heat to the fins and then transfer it to the air in a large area by the fins. The fuel tank is easy to carry out high - efficiency self - heat - dissipation, making it not easily cause unnecessary damage due to excessive temperature, and helping to improve work efficiency.

[0006] Existing hydraulic oil pumps still rely on air - cooling or water - cooling methods to achieve heat transfer. They can achieve a good heat - dissipation effect under a stable and suitable ambient temperature. However, in hot summers and cold winters, the disadvantages of water - cooling and air - cooling are manifested. Water will freeze in a low - temperature environment in winter, thus affecting the normal heat - dissipation function. And in hot summers, the heat - dissipation effect relying on heat - dissipation fins is limited. Summary of the Invention

[0007] Aiming at the above - mentioned existing technologies, the technical problem to be solved by the present invention is to reduce the influence of the external ambient temperature on the cooling of hydraulic oil.

[0008] To solve the above problems, the present invention provides a hydraulic pump station with a self - monitoring unit, including a hydraulic pump station body. A temperature sensor is fixedly connected to the inner wall of the fuel tank of the hydraulic pump station body, and an irradiation lamp is fixedly connected to the inner wall of the fuel tank opposite to the temperature sensor. The temperature sensor includes a back plate, and a photosensitive sensor is fixedly connected to the side wall of the back plate. A mercury thermometer is fixedly connected to the outer surface of the photosensitive sensor. The temperature sensor includes a light - zone length measurement module, a signal conversion module, and a regulation module that are electrically connected to the photosensitive sensor. A cooling box is fixedly connected to the upper end of the fuel tank of the hydraulic pump station body, and a heat dissipation port is opened in the middle of the upper end of the cooling box. Both side walls of the cooling box are communicated with oil pipes that are communicated with the fuel tank, and an oil transfer pump communicated with the oil pipes is installed inside the fuel tank. A telescopic heat exchange cylinder communicated with the heat dissipation port is fixedly connected to the inner wall of the upper end of the cooling box, and a plurality of semiconductor refrigeration chips electrically connected to the regulation module are fixedly connected to the inner wall of the telescopic heat exchange cylinder. Two symmetrically distributed suspension rods are fixedly connected to the inner wall of the upper end of the telescopic heat exchange cylinder, and a suspension ring is fixedly connected to the lower ends of the two suspension rods at the same time. A double - sided electromagnet electrically connected to the regulation module is fixedly inlaid in the middle of the suspension ring, and a magnetic pad 1 that magnetically repels the double - sided electromagnet is fixedly connected to the bottom of the telescopic heat exchange cylinder. A heat - insulating sleeve is also fixedly connected between the suspension ring and the bottom of the telescopic heat exchange cylinder, and the magnetic pad 1 is located inside the heat - insulating sleeve. A magnetic pad 2 is slidably connected between the two suspension rods, and the magnetic pad 2 also magnetically repels the double - sided electromagnet. A support is fixedly connected to the upper side wall of the magnetic pad 2, and a protective cover matching the heat dissipation port is fixedly connected to the upper end of the support.

[0009] In the above - mentioned hydraulic pump station with a self - monitoring unit, the semiconductor refrigeration technology is used to cool the hydraulic oil, effectively reducing the influence of the external environment on the cooling effect, and adaptively cooling the hydraulic oil according to the temperature change.

[0010] As a further improvement of the present application, the light emitted by the irradiation lamp covers the entire mercury thermometer. The uppermost end of the mercury thermometer is set as the measurement starting point a, and the mercury liquid level inside the mercury thermometer is set as the measurement ending point b. The light emitted by the irradiation lamp irradiates the mercury thermometer, and the light passes through the glass tube of the mercury thermometer and projects onto the photosensitive sensor. The light is blocked when passing through the mercury column. In this way, the length of the light zone that the photosensitive sensor can detect is from point a to point b. The change in the temperature of the hydraulic oil will cause the mercury column to rise and fall, thereby changing the distance between points a and b. The light - zone length measurement module senses the change in the temperature of the hydraulic oil by measuring the distance between points a and b. The signal conversion module converts the measured distance signal into an electric current signal, and the regulation module then regulates the refrigeration effect of the semiconductor refrigeration chip according to the magnitude of the electric current signal, so as to achieve the purpose of adaptive cooling according to the temperature of the hydraulic oil.

[0011] As a further improvement of the present application, the telescopic heat exchange cylinder includes a plurality of exposed sections and hidden sections, and the plurality of exposed sections and hidden sections are alternately fixedly connected. The semiconductor refrigeration sheet is installed on the inner wall of the exposed section. An opening communicating with the heat dissipation port is provided in the middle of the uppermost exposed section. The combination of the exposed section and the hidden section can realize the change in the length of the telescopic heat exchange cylinder. In the initial state, the exposed sections are stacked together, and at this time, the hidden sections are hidden by the exposed sections. When efficient cooling is carried out, the hidden sections are stretched out by the exposed sections at this time, so as to increase the heat exchange area with the hydraulic oil, thereby effectively improving the cooling effect.

[0012] As a further improvement of the present application, the hidden section includes a heat transfer layer, and an embedded layer is fixedly embedded on the inner wall of the heat transfer layer. The heat transfer layer absorbs the cold of the exposed section and exchanges heat with the hydraulic oil, so as to increase the heat exchange area, and the embedded layer plays a role of internal support, enabling the heat transfer layer to be hidden, folded or extended as the telescopic heat exchange cylinder expands and contracts.

[0013] As another improvement of the present application, the exposed section is made of a hard heat-conducting material, the heat transfer layer is made of a flexible heat-conducting material, and the embedded layer is made of an elastic heat-conducting material. The function of the heat transfer layer is to transfer the cold of the exposed section, and then participate in the cooling work of heat exchange with the hydraulic oil, so as to effectively improve the cooling effect, and the embedded layer plays a role of supporting the heat transfer layer, enabling the heat transfer layer to be folded, hidden and extended.

[0014] As another improvement of the present application, the heat insulation sleeve is made of a temperature-resistant elastic material, and a magnetic insulation layer is bonded to the inner wall of the heat insulation sleeve. The function of the heat insulation sleeve is to protect the first magnetic pad from the heat dissipated by the semiconductor refrigeration sheet, and at the same time prevent the magnetic field generated by the first magnetic pad from affecting the semiconductor refrigeration sheet. In addition, the heat insulation sleeve plays a role of resetting the telescopic heat exchange cylinder, so that the telescopic heat exchange cylinder can expand and contract freely.

[0015] In summary, by adding a temperature sensor on the basis of the existing hydraulic pump station to monitor the temperature of the hydraulic oil in real time, using the light-blocking effect of the mercury column to measure the length of the light area, thereby obtaining a control signal, and adjusting the refrigeration effect of the semiconductor refrigeration sheet according to this control signal, so as to achieve the purpose of adaptive cooling following the temperature of the hydraulic oil. Also, by adjusting the telescopic length of the telescopic heat exchange cylinder to adjust the size of the heat exchange area, the cooling effect at high temperatures is effectively improved, and the icing problem in low-temperature weather can be effectively avoided, effectively solving the problem that the existing heat dissipation is easily affected by the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional view of the first embodiment of the present application;

[0017] Figure 2 is a schematic installation diagram of the temperature sensor and the irradiation lamp of the first embodiment of the present application;

[0018] Figure 3 Schematic diagram of the operation of the temperature sensor and the irradiation lamp according to the first embodiment of the present application;

[0019] Figure 4 Front view of the telescopic heat exchange cylinder before deformation according to the first embodiment of the present application;

[0020] Figure 5 Front view of the telescopic heat exchange cylinder after deformation according to the first embodiment of the present application;

[0021] Figure 6 Stereogram of the telescopic heat exchange cylinder before deformation according to the first embodiment of the present application;

[0022] Figure 7 Stereogram of the telescopic heat exchange cylinder after deformation according to the second embodiment of the present application;

[0023] Figure 8 is Figure 5 Enlarged view of the structure at A in

[0024] Figure 9 Cross-sectional view of the telescopic heat exchange cylinder before deformation according to the first embodiment of the present application;

[0025] Figure 10 Cross-sectional view of the telescopic heat exchange cylinder after deformation according to the second embodiment of the present application.

[0026] Explanation of the reference numerals in the figure:

[0027] 1 Hydraulic pump station body, 2 Temperature sensor, 201 Back panel, 202 Photosensitive sensor, 203 Mercury thermometer, 3 Irradiation lamp, 4 Cooling box, 401 Heat dissipation port, 5 Oil pipe, 6 Telescopic heat exchange cylinder, 601 Exposed section, 6011 Opening, 602 Hidden section, 6021 Heat transfer layer, 6022 Embedded layer, 7 Suspension rod, 8 Suspension ring, 9 Double-sided electromagnet, 10 Magnetic pad one, 11 Heat insulation sleeve, 12 Magnetic pad two, 13 Bracket, 14 Protective cover, 15 Semiconductor refrigeration sheet. Specific embodiments

[0028] The following will describe in detail the two embodiments of the present application with reference to the accompanying drawings.

[0029] The first embodiment:

[0030] Figure 1 , 2 and Figure 3Shown, it includes a hydraulic pump station body 1. A temperature sensor 2 is fixedly connected to the inner wall of the fuel tank of the hydraulic pump station body 1. And an irradiation lamp 3 is fixedly connected to the inner wall of the fuel tank facing the temperature sensor 2. The temperature sensor 2 includes a back plate 201, and a photosensitive sensor 202 is fixedly connected to the side wall of the back plate 201 (the specific structure and working principle are well-known technologies for those skilled in the relevant art, and the specific model is selected according to actual needs and will not be described in detail here). A mercury thermometer 203 is fixedly connected to the outer surface of the photosensitive sensor 202. The working state of the mercury thermometer 203 is stable, less affected by the external environment, and the measured temperature of the hydraulic oil is more accurate. The temperature sensor 2 includes a light zone length measurement module, a signal conversion module, and a regulation module that are electrically connected to the photosensitive sensor 202. The light emitted by the irradiation lamp 3 covers the entire mercury thermometer 203. The uppermost end of the mercury thermometer 203 is set as the measurement starting point a, and the mercury liquid level inside the mercury thermometer 203 is set as the measurement ending point b. The light emitted by the irradiation lamp 3 irradiates the mercury thermometer 203, and the light passes through the glass tube of the mercury thermometer 203 and projects onto the photosensitive sensor 202. The light is blocked when passing through the mercury column. In this way, the length of the light zone that the photosensitive sensor 202 can detect is from point a to point b. The change in the temperature of the hydraulic oil will cause the mercury column to rise and fall, thereby changing the distance between points a and b. The light zone length measurement module senses the change in the temperature of the hydraulic oil by measuring the distance between points a and b. The signal conversion module converts the measured distance signal into a current signal. The regulation module then regulates the refrigeration effect of the semiconductor refrigeration sheet 15 according to the magnitude of the current signal, so as to achieve the purpose of self-adaptive cooling according to the temperature of the hydraulic oil. The upper end of the fuel tank of the hydraulic pump station body 1 is fixedly connected to a cooling box 4. And a heat dissipation port 401 is opened in the middle of the upper end of the cooling box 4. Both side walls of the cooling box 4 are communicated with oil pipes 5 that are communicated with the fuel tank. And an oil transfer pump (the specific connection structure and working principle are well-known technologies for those skilled in the relevant art and will not be described in detail here) is installed inside the fuel tank and is communicated with the oil pipe 5;

[0031] Figure 9 、 10It is shown that a telescopic heat exchange cylinder 6 communicating with the heat dissipation port 401 is fixedly connected to the inner wall of the upper end of the cooling box 4, and a plurality of semiconductor refrigeration sheets 15 (specific models are selected according to actual requirements) electrically connected to the regulation module are fixedly connected to the inner wall of the telescopic heat exchange cylinder 6. Two symmetrically distributed suspension rods 7 are fixedly connected to the inner wall of the upper end of the telescopic heat exchange cylinder 6, and a suspension ring 8 is fixedly connected to the lower ends of the two suspension rods 7 at the same time. A double-sided electromagnet 9 (specific models are selected according to actual requirements) electrically connected to the regulation module is fixedly embedded in the middle of the suspension ring 8. Magnetic fields are generated on both the upper and lower surfaces of the double-sided electromagnet 9 so as to repel the magnetic pad one 10 and the magnetic pad two 12. A magnetic pad one 10 magnetically repulsive to the double-sided electromagnet 9 is fixedly connected to the bottom of the telescopic heat exchange cylinder 6. A heat insulation sleeve 11 is also fixedly connected between the suspension ring 8 and the bottom of the telescopic heat exchange cylinder 6. The heat insulation sleeve 11 is made of a heat-resistant elastic material (preferably polyurethane elastic material, and other materials can also be selected according to actual requirements), and a magnetic insulation layer is adhered to the inner wall of the heat insulation sleeve 11. The function of the heat insulation sleeve 11 is to protect the magnetic pad one 10 from the heat dissipated by the semiconductor refrigeration sheet 15, and at the same time prevent the magnetic field generated by the magnetic pad one 10 from affecting the semiconductor refrigeration sheet 15. In addition, the heat insulation sleeve 11 plays a role in resetting the telescopic heat exchange cylinder 6 so that the telescopic heat exchange cylinder 6 can freely expand and contract. The magnetic pad one 10 is located inside the heat insulation sleeve 11. A magnetic pad two 12 is slidably connected between the two suspension rods 7, and the magnetic pad two 12 is also magnetically repulsive to the double-sided electromagnet 9. A support 13 is fixedly connected to the upper side wall of the magnetic pad two 12, and a protective cover 14 matching the heat dissipation port 401 is fixedly connected to the upper end of the support 13.

[0032] The second implementation mode:

[0033] Figure 4 、 5 、6 and Figure 7It is shown that the telescopic heat exchange cylinder 6 includes a plurality of exposed segments 601 and hidden segments 602. The hidden segment 602 includes a heat transfer layer 6021, and an embedded layer 6022 is fixedly inlaid on the inner wall of the heat transfer layer 6021. The heat transfer layer 6021 absorbs the cold of the exposed segment 601 and exchanges heat with the hydraulic oil, thereby increasing the heat exchange area. The embedded layer 6022 plays a role of internal support, enabling the heat transfer layer 6021 to be hidden, folded or extended as the telescopic heat exchange cylinder 6 expands and contracts. The plurality of exposed segments 601 and hidden segments 602 are alternately fixedly connected. The semiconductor refrigerating sheet 15 is installed on the inner wall of the exposed segment 601. An opening 6011 communicating with the heat dissipation port 401 is provided in the middle of the uppermost exposed segment 601. The combination of the exposed segment 601 and the hidden segment 602 can realize the change in the length of the telescopic heat exchange cylinder 6. In the initial state, the exposed segments 601 are stacked together, and at this time, the hidden segment 602 is hidden by the exposed segment 601. When efficient cooling is carried out, the hidden segment 602 is stretched out by the exposed segment 601 at this time, thereby increasing the heat exchange area with the hydraulic oil, and thus effectively improving the cooling effect;

[0034] Figure 8 It is shown that the exposed segment 601 is made of a hard heat-conducting material (preferably a metal material, and other materials can also be selected according to actual needs). The heat transfer layer 6021 is made of a flexible heat-conducting material (preferably a silicone material, and other materials can also be selected according to actual needs). The embedded layer 6022 is made of an elastic heat-conducting material (preferably a polyurethane elastic material, and other materials can also be selected according to actual needs). The function of the heat transfer layer 6021 is to transfer the cold of the exposed segment 601, and then participate in the cooling work of heat exchange with the hydraulic oil, thereby effectively improving the cooling effect. The embedded layer 6022 plays a role of supporting the heat transfer layer 6021, enabling the heat transfer layer 6021 to be folded, hidden and extended.

[0035] The working principle of this solution is as follows: After the hydraulic oil flows back to the fuel tank through filtration, the mercury thermometer 203 measures the temperature of the hydraulic oil. The mercury column rises with the increase of temperature and falls with the decrease of temperature. The light emitted by the irradiation lamp 3 irradiates the mercury thermometer 203, and the light passes through the glass tube of the mercury thermometer 203 and projects onto the photosensitive sensor 202. The light is blocked when passing through the mercury column. In this way, the length of the light area that the photosensitive sensor 202 can detect is from point a to point b. The change in the temperature of the hydraulic oil will cause the mercury column to rise and fall, thereby changing the distance between points a and b. The light area length measurement module senses the change in the temperature of the hydraulic oil by measuring the distance between points a and b. The signal conversion module converts the measured distance signal into an electric current signal, and the regulation module then adjusts the electric current passing through the semiconductor refrigeration sheet 15 according to the electric current signal. When the distance between points a and b increases, the electric current passing through the semiconductor refrigeration sheet 15 decreases; when the distance between points a and b decreases, the electric current passing through the semiconductor refrigeration sheet 15 increases. In this way, the self-adaptive cooling of the hydraulic oil is realized. The regulation module also regulates the electric current passing through the double-sided electromagnet 9. Similarly, when the distance between points a and b increases, the electric current passing through the double-sided electromagnet 9 decreases; when the distance between points a and b decreases, the electric current passing through the double-sided electromagnet 9 increases. The magnetic force generated by the double-sided electromagnet 9 repels the magnetic pad one 10 and the magnetic pad two 12, and the protective cover 14 is opened upward, allowing the heat generated when the semiconductor refrigeration sheet 15 works to dissipate. And the hidden section 602 is pulled out by the exposed section 601 and participates in the heat exchange work with the hydraulic oil. A part of the cold generated by the semiconductor refrigeration sheet 15 is transferred to the exposed section 601, and a part is transferred to the hidden section 602. In this way, the heat exchange area can be increased, thereby effectively improving the cooling effect.

[0036] Combined with the current actual requirements, the above implementation method adopted in this application, the protection scope is not limited to this. Within the knowledge scope of those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A hydraulic pump station with a self-monitoring unit, characterized in that: It includes a hydraulic pump station body (1). A temperature sensor (2) is fixedly connected to the inner wall of the fuel tank of the hydraulic pump station body (1). And an irradiation lamp (3) is fixedly connected to the inner wall of the fuel tank facing the temperature sensor (2). The temperature sensor (2) includes a back plate (201), and a photosensitive sensor (202) is fixedly connected to the side wall of the back plate (201). A mercury thermometer (203) is fixedly connected to the outer surface of the photosensitive sensor (202). The temperature sensor (2) includes a light zone length measurement module, a signal conversion module and a regulation module that are electrically connected to the photosensitive sensor (202). A cooling box (4) is fixedly connected to the upper end of the fuel tank of the hydraulic pump station body (1). And a heat dissipation port (401) is opened in the middle of the upper end of the cooling box (4). Oil pipes (5) communicating with the fuel tank are communicated with both side walls of the cooling box (4). And an oil transfer pump communicated with the oil pipes (5) is installed inside the fuel tank. A telescopic heat exchange cylinder (6) communicated with the heat dissipation port (401) is fixedly connected to the inner wall of the upper end of the cooling box (4). And a plurality of semiconductor refrigeration sheets (15) electrically connected to the regulation module are fixedly connected to the inner wall of the telescopic heat exchange cylinder (6). Two symmetrically distributed suspension rods (7) are fixedly connected to the inner wall of the upper end of the telescopic heat exchange cylinder (6). And a suspension ring (8) is fixedly connected to the lower ends of the two suspension rods (7) at the same time. A double-sided electromagnet (9) electrically connected to the regulation module is fixedly inlaid in the middle of the suspension ring (8). And a magnetic pad one (10) magnetically repelling the double-sided electromagnet (9) is fixedly connected to the bottom of the telescopic heat exchange cylinder (6). A heat insulation sleeve (11) is also fixedly connected between the suspension ring (8) and the bottom of the telescopic heat exchange cylinder (6). And the magnetic pad one (10) is located inside the heat insulation sleeve (11). A magnetic pad two (12) is slidably connected between the two suspension rods (7). And the magnetic pad two (12) is also magnetically repelled by the double-sided electromagnet (9). A support (13) is fixedly connected to the upper side wall of the magnetic pad two (12). And a protective cover (14) matching the heat dissipation port (401) is fixedly connected to the upper end of the support (13).

2. The hydraulic pump station with a self-monitoring unit according to claim 1, characterized in that: The light emitted by the irradiation lamp (3) covers the entire mercury thermometer (203). The uppermost end of the mercury thermometer (203) is set as the measurement starting point a. The mercury liquid level inside the mercury thermometer (203) is set as the measurement ending point b.

3. A hydraulic pump station with a self-monitoring unit according to claim 1, characterized in that: The telescopic heat exchange cylinder (6) includes a plurality of exposed sections (601) and hidden sections (602). And the plurality of exposed sections (601) and hidden sections (602) are alternately and fixedly connected. The semiconductor refrigeration sheets (15) are installed on the inner wall of the exposed sections (601). An opening (6011) communicated with the heat dissipation port (401) is opened in the middle of the uppermost exposed section (601).

4. A hydraulic pump station with a self-monitoring unit according to claim 3, characterized in that: The hidden section (602) includes a heat transfer layer (6021). And an embedded layer (6022) is fixedly inlaid on the inner wall of the heat transfer layer (6021).

5. A hydraulic pump station with a self-monitoring unit according to claim 4, characterized in that: The exposed section (601) is made of a hard heat-conducting material, the heat transfer layer (6021) is made of a flexible heat-conducting material, and the embedded layer (6022) is made of an elastic heat-conducting material.

6. A hydraulic pump station with a self-monitoring unit according to claim 1, characterized in that: The heat insulation sleeve (11) is made of a heat-resistant elastic material, and a magnetic insulation layer is adhesively bonded to the inner wall of the heat insulation sleeve (11).

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