Cleaning device of diamond micro-powder ultrasonic cell crusher

Abstract

The utility model relates to a cleaning device of a diamond micro-powder ultrasonic cell crusher. The cleaning device comprises a cleaning component and a collecting component, wherein the cleaning component is elastically connected to a vertical rod in a sliding manner up and down; the cleaning assembly comprises an adjusting seat and a washing ring pipe with the inner side wall provided with a water outlet hole and a brush at the same time, the vertical rod is sleeved with the adjusting seat, the washing ring pipe is arranged on one side of the adjusting seat, the amplitude-change pole is sleeved with the washing ring pipe, a water inlet valve is arranged at the top of the soundproof box, and a water pipe is communicated between the water inlet valve and the washing ring pipe. The collecting assembly comprises a wastewater tank, partition plates and a water outlet valve, the multiple partition plates are arranged at the bottom in the wastewater tank at intervals, and the top in the wastewater tank communicates with the water outlet valve; and a hollow operation table is arranged between the wastewater tank and the flushing ring pipe. The surface of the amplitude-change pole can be washed and brushed by water conveniently and efficiently, and meanwhile, waste water generated by washing can be effectively collected.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic cell pulverizers, in particular to a cleaning device for a diamond micro-powder ultrasonic cell pulverizer. Background Art

[0002] Ultrasonic cell pulverizer is a machine that uses the dispersion effect of ultrasound in liquid to produce cavitation in the liquid, thereby breaking up solid particles or cell tissues in the liquid. Ultrasonic cell pulverizer can also disperse rare earth and various inorganic mineral powders, which is very practical.

[0003] In the diamond micropowder industry, the detection methods for different micropowder particle sizes are different. In many cases, in order to disperse the micropowder to be tested and to ensure the stability of the test results, an ultrasonic cell crusher is required to perform ultrasound before the particle size test can be carried out.

[0004] The ultrasonic cell crusher used in our unit is as follows Figure 1 As shown, it includes a soundproof box, an ultrasonic transducer, a horn, a vertical pole, a liftable operating table and a control panel. The soundproof box has a door, and a hole is opened on the top of the soundproof box. The ultrasonic transducer can be removed and installed through the hole. The horn is installed under the ultrasonic transducer and extends into the soundproof box. At the same time, a vertical pole is vertically arranged in the soundproof box, and an operating table is liftable on the vertical pole. There is a control panel at the front of the top of the soundproof box.

[0005] When the diamond powder is ultrasonicated, the powder is placed in a container, the container is placed on the operating table, and then the operating table is manually adjusted to move up until the horn is inserted into the powder, and then the ultrasonic transducer is controlled to start through the control panel to ultrasonicate the diamond powder. Due to the fine particle size of diamond powder and the particularity of the material, sometimes after the ultrasonicated material is taken away, some material will be stained on the horn. In order to prevent the attached material from affecting the ultrasonication of subsequent materials, the horn needs to be rinsed after each ultrasonication of a type of material.

[0006] Since there is no suitable flushing method at present, the horn is flushed up and down with a water pipe, and then a plate is placed on the operating table to collect the waste water, and then the waste water in the plate is poured out, which is extremely inconvenient. The above cleaning operation is relatively cumbersome, the cleaning time is long, the cleaning effect needs to be improved, and if it is busy, it is easy to affect the material measurement time and reduce work efficiency.

[0007] In the prior art, there are also devices for cleaning the amplitude transformer, such as a cleaning device for ultrasonic dispersers, patent publication number CN218835325U, in which the cleaning part is slidably mounted on the transducer and supported by the transducer, which may affect the operation of the transducer. The cleaning part is fixed to the transducer by the elastic deformation of the rubber ring, but when in use, it is necessary to overcome the friction to move up and down along the transducer, and the movement of the cleaning part is not smooth. The cleaning part is only a water flushing method, and the cleaning effect is limited. In addition, the collecting part for collecting waste water is installed in a soundproof box. The collecting part is an electrically controlled structure and can swing left and right, so its structure is relatively complex and will occupy a certain amount of space inside the soundproof box. Summary of the invention

[0008] In order to solve the problems that conventional water cleaning operations are cumbersome and not smooth and it is difficult to conveniently collect waste water, the utility model provides a cleaning device for a diamond micropowder ultrasonic cell crusher. The cleaning device is based on the existing ultrasonic cell crusher and is equipped with a cleaning component and a collecting component. The cleaning component can move up and down to wash the amplitude transformer, and the collecting component can conveniently collect the washed waste water.

[0009] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0010] The cleaning device of the diamond micro powder ultrasonic cell crusher comprises a cleaning component elastically slidably connected to the vertical pole and a collecting component arranged at the bottom of the soundproof box;

[0011] The cleaning assembly includes an adjustment seat and a flushing ring tube with a water outlet and a brush on the inner wall. The adjustment seat is sleeved on the vertical pole. The adjustment seat can move up and down along the vertical pole, or can be fixed on the vertical pole. The flushing ring tube is arranged on one side of the adjustment seat to facilitate the flushing ring tube to move or fix together. The flushing ring tube is sleeved on the amplitude rod and can clean the surface of the amplitude rod. A water inlet valve is arranged on the top of the sound insulation box. A water pipe is connected between the water inlet valve and the flushing ring tube to facilitate water supply to the flushing ring tube.

[0012] The collecting assembly comprises a wastewater trough, a partition and an outlet valve. A plurality of the partitions are arranged at intervals at the bottom of the wastewater trough to reduce the fluctuation of the wastewater in the wastewater trough. The top of the wastewater trough is connected to the outlet valve to facilitate the outflow of the wastewater. A hollow operating table is arranged between the wastewater trough and the flushing ring pipe to improve the smoothness of the flushed wastewater flowing into the wastewater trough. The operating table is arranged on a vertical pole for lifting up and down.

[0013] Furthermore, the adjustment seat and the ring seat body and the hand-tightening bolt threadedly connected to the ring seat body, the ring seat body is sleeved on the vertical pole and slides up and down along the vertical pole, the head of the hand-tightening bolt passes through the ring seat body and is tightly pressed against the side wall of the vertical pole, so that the locking of the adjustment seat can be conveniently controlled to fix it or unlock the adjustment seat to make it slidable, and a compression spring is sleeved on the vertical pole between the ring seat body and the operating table, which can assist manual pressure to make it move up and down conveniently.

[0014] Furthermore, the interior of the flushing ring tube is hollow to form a flushing cavity, which is a space for water to flow in the flushing ring tube. The flushing ring tube includes an inlet section and an outlet section that are interconnected. The inlet section is in the shape of a straight tube, with one end of the water inlet connected to a fixed adjustment seat and the other end connected to the outlet section. The outlet section is in the shape of a circular tube, and the outlet section is sleeved on the amplitude rod. There is a distance between the inner wall of the outlet section and the amplitude rod to avoid interference between the flushing ring tube and the amplitude rod when moving up and down.

[0015] Furthermore, the inner wall of the water outlet section is circumferentially provided with a plurality of the water outlet holes to achieve uniform water outlet, the water outlet holes are directed toward the amplitude transformer, the inner wall of the water outlet section is also provided with the brushes, the brushes are arranged above and below the water outlet holes, the brushes contact the surface of the amplitude transformer, and facilitate uniform brushing.

[0016] Furthermore, a water collecting ring is provided below the water outlet section. The water collecting ring is a circular ring body with a trumpet-shaped cross-section. The water collecting ring is sleeved on the amplitude transformer. The large diameter end of the water collecting ring is connected and fixed to the water outlet section, so as to divert the flushed wastewater so that it flows downward along the surface of the amplitude transformer to avoid arbitrary flow.

[0017] Furthermore, the water pipe is a corrugated telescopic pipe to meet the continuous water supply demand when the flushing ring pipe moves up and down. The upper end of the water pipe is connected to the water inlet valve, and the lower end of the water pipe is connected to the water inlet section and connected to the flushing cavity.

[0018] Furthermore, the wastewater trough is a rectangular groove structure, and the cross-sectional area of ​​the wastewater trough is the same as the cross-sectional area of ​​the soundproof box, ensuring that the flushed wastewater can flow into the wastewater trough, and the partition divides the interior of the wastewater trough into multiple spaces, and the height of the partition is less than or equal to half the height of the wastewater trough. The water outlet valve corresponds to the opening on the side wall of the soundproof box, and the water outlet valve extends out of the soundproof box, which facilitates the operation of the water outlet valve; a plurality of circular holes that pass through the operating table are opened on the operating table.

[0019] Through the above technical solution, the beneficial effects of the utility model are:

[0020] The utility model has a reasonable structural design. The cleaning component relies on the vertical pole, and an adjustment seat is elastically slidably connected to the vertical pole. The adjustment seat can be locked separately, which is convenient for fixing the adjustment seat. When the adjustment seat slides elastically up and down along the vertical pole by manual pressing, it will drive the flushing ring tube sleeved outside the amplitude change rod to move together. The compression spring can promote the convenience of manually pressing the adjustment seat up and down. The flushing ring tube uses a combination of water flushing and a brush to effectively scrub the surface of the amplitude change rod to ensure the scrubbing effect.

[0021] The wastewater tank of the utility model is arranged at the bottom of the soundproof box, has a simple structure and occupies a small space, and will not affect the ultrasonic operation of diamond micropowder. The multiple partitions in the wastewater tank can divide the wastewater tank into multiple spaces, and the partitions are used to reduce the fluctuation of wastewater, increase the precipitation speed of diamond micropowder in wastewater, and facilitate the upper and lower stratification of liquid and powder. At the same time, the operating table is designed as a hollow structure, which facilitates the flushed wastewater to quickly flow down through the operating table into the wastewater tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of an existing ultrasonic cell disruptor, in which the soundproof box is in an open state.

[0023] Figure 2 It is a front view of a cleaning device of a diamond micro-powder ultrasonic cell pulverizer according to the utility model.

[0024] Figure 3 It is a transverse sectional view of a cleaning component of a cleaning device of a diamond micro-powder ultrasonic cell crusher of the utility model, wherein the arrow in the figure points to the flow direction of water in the flushing ring tube.

[0025] Figure 4 It is a longitudinal sectional view of a cleaning component of a cleaning device of a diamond micro-powder ultrasonic cell pulverizer of the utility model.

[0026] Figure 5 It is a top view of a collecting component of a cleaning device of a diamond micro-powder ultrasonic cell crusher of the utility model.

[0027] The numbers in the accompanying drawings are: 1 sound insulation box, 2 ultrasonic transducer, 3 amplitude transformer, 4 vertical pole, 5 operating table, 6 control panel, 7 adjustment seat, 71 ring seat body, 72 hand-tightening bolts, 8 flushing ring pipe, 81 water inlet section, 82 water outlet section, 9 water outlet hole, 10 brush, 11 compression spring, 12 flushing chamber, 13 water inlet valve, 14 water pipe, 15 water collecting ring, 16 wastewater tank, 17 partition, 18 water outlet valve, 19 support rod, 20 internal threaded cylinder, 21 round hole, 22 box door. DETAILED DESCRIPTION

[0028] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings:

[0029] like Figure 2~Figure 5 As shown, the cleaning device of the diamond micro powder ultrasonic cell crusher includes a cleaning component elastically slidably connected to the vertical pole 4 and a collecting component arranged at the bottom of the soundproof box 1. The cleaning component can use the water source to wash the horn 3, and the cleaning component can slide up and down along the vertical pole 4 to achieve comprehensive cleaning of the horn 3, and the waste water washed down is collected by the collecting component.

[0030] The cleaning assembly includes an adjustment seat 7 and a flushing ring tube 8 with a water outlet 9 and a brush 10 on the inner wall. Figure 2 As shown. The adjustment seat 7 is sleeved on the vertical pole 4, and the adjustment seat 7 includes a ring seat body 71 and a hand screw 72 threadedly connected to the ring seat body 71. Here, the ring seat body 71 is sleeved on the vertical pole 4 and can slide up and down along the vertical pole 4. In order to achieve fixation after sliding, the head of the hand screw 72 passes through the ring seat body 71 and is tightly pressed against the side wall of the vertical pole 4. When the hand screw 72 is tightened, the adjustment seat 7 can be locked, otherwise the adjustment seat 7 is unlocked.

[0031] In order to support the up and down sliding of the adjustment seat 7, a compression spring 11 is sleeved on the vertical rod 4 between the ring seat body 71 and the operating table 5. The operating table 5 is set on the vertical rod 4 for lifting and lowering, which is a prior art. The lifting structure of the operating table 5 can also refer to the up and down sliding structure of the adjustment seat 7, which will not be repeated here. On the basis of the fixed operation table 5, under the support of the compression spring 11, the adjustment seat 7 can be pushed up, and the adjustment seat 7 can be slid up and down by manual pressing.

[0032] A flushing ring pipe 8 is arranged on one side of the adjusting seat 7. When the adjusting seat 7 moves up and down, the flushing ring pipe 8 can be driven to move together. The flushing ring pipe 8 is sleeved on the amplitude rod 3, and can move up and down along the amplitude rod 3. The flushing ring pipe 8 is hollow inside to form a flushing cavity 12. The flushing ring pipe 8 includes an inlet section 81 and an outlet section 82 that are interconnected, and the insides of the inlet section 81 and the outlet section 82 are both flushing cavities 12 where water flows. Figure 3 and Figure 4 shown.

[0033] The water inlet section 81 is in the shape of a straight tube, one end of the water inlet is connected to the adjustment seat 7, and the other end is connected to the water outlet section 82. The water outlet section 82 is in the shape of a circular tube, and the water outlet section 82 is sleeved on the horn 3. There is a gap between the inner wall of the water outlet section 82 and the horn 3, so that it does not directly contact the surface of the horn 3. The inner wall of the water outlet section 82 is provided with a plurality of water outlet holes 9 in the circumferential direction, and the water outlet holes 9 face the horn 3, and are used to flush the water of the ring tube 8 toward the horn 3. The inner wall of the water outlet section 82 is also provided with a brush 10, and the brushes 10 are arranged above and below the water outlet holes 9. The brushes 10 contact the surface of the horn 3, and the surface of the horn 3 can be evenly brushed.

[0034] In order to realize water supply to the flushing ring pipe 8, a water inlet valve 13 is arranged on the top of the soundproof box 1, and a water pipe 14 is connected between the water inlet valve 13 and the flushing ring pipe 8. Specifically, the water pipe 14 is a corrugated telescopic pipe, which has certain telescopic characteristics to meet the requirements of the up and down movement of the flushing ring pipe 8. The upper end of the water pipe 14 is connected to the water inlet valve 13, and the water inlet valve 13 can be connected to the external tap water pipe 14. The lower end of the water pipe 14 is connected to the water inlet section 81 and connected to the flushing chamber 12.

[0035] The water source used for flushing can flow into the flushing cavity 12 of the flushing ring tube 8 from the water inlet valve 13 and the water pipe 14 in sequence, and the water source flows from the water inlet section 81 to the water outlet section 82, and finally flows out from the water outlet hole 9 evenly to the surface of the amplitude transformer 3, so as to flush the amplitude transformer 3 and prevent the surface of the amplitude transformer 3 from being attached with diamond micropowder.

[0036] The flushing water will first flow to the operating table 5. To prevent the water from spreading, a water collecting ring 15 is further provided below the water outlet section 82. The water collecting ring 15 is a circular ring body with a trumpet-shaped cross section. The water collecting ring 15 is sleeved on the horn 3. The large diameter end of the water collecting ring 15 is connected and fixed to the water outlet section 82, and the small diameter end of the water collecting ring 15 is spaced from the horn 3. The water collecting ring 15 can provide guidance for the flushing water, prevent the water flow from spreading, and make it flow downward next to the horn 3.

[0037] After the water source flushes the horn 3, waste water is formed. In order to collect the waste water and prevent the waste water from flowing freely, the collection component includes a waste water tank 16, a partition 17 and a water outlet valve 18. Figure 5 The wastewater tank 16 is a rectangular groove structure, and the cross-sectional area of ​​the wastewater tank 16 is the same as the cross-sectional area of ​​the soundproof box 1, so that the wastewater tank 16 can just be placed in the soundproof box 1, and the wastewater tank 16 has a certain height, so that it can hold a certain volume of wastewater.

[0038] Since the wastewater contains diamond powder, in order to facilitate the precipitation of diamond powder and reduce the disturbance of the wastewater to the diamond powder, a plurality of partitions 17 are arranged at intervals at the bottom of the wastewater tank 16, and the height of the partition 17 is less than or equal to half the height of the wastewater tank 16. The partition 17 divides the interior of the wastewater tank 16 into a plurality of spaces, thereby reducing the fluctuation of the wastewater, and promoting the precipitation of diamond powder at the bottom of the wastewater tank 16 faster, and the wastewater containing no or little diamond powder accumulates at the top of the wastewater tank 16.

[0039] The top of the wastewater tank 16 is connected to a water outlet valve 18, which corresponds to the opening on the side wall of the soundproof box 1. The water outlet valve 18 extends out of the soundproof box 1 and is located behind the soundproof box 1, while a door is provided in front of the soundproof box 1. The outside of the soundproof box 1 facilitates the opening and closing of the water outlet valve 18. The wastewater on the top layer of the wastewater tank 16 can be quickly discharged through the water outlet valve 18 for subsequent treatment.

[0040] When installing the present invention, special attention should be paid to the installation of the waste water tank 16. Since the waste water tank 16 occupies the entire cross-section of the bottom of the sound insulation box 1, and the original vertical pole 4 in the sound insulation box 1 will interfere with the placement of the waste water tank 16, a part of the lower part of the vertical pole 4 can be cut off to disconnect it from the bottom of the sound insulation box 1, but the upper part of the vertical pole 4 is still connected and fixed to the top of the sound insulation box 1.

[0041] At the same time, a support rod 19 is arranged in the waste water tank 16, and the height of the support rod 19 can make up for the cut-off part of the vertical pole 4, and an internal threaded tube 20 is threadedly connected to the support rod 19. After the waste water tank 16 is placed in the soundproof box 1, the support rod 19 corresponds to the vertical pole 4, and at this time, the internal threaded tube 20 is rotated to move it upward, and the support rod 19 and the vertical pole 4 are connected, and then the lower part of the vertical pole 4 can be fixed by the support rod 19 to prevent the vertical pole 4 from being suspended in the air, and the vertical pole 4 can still be kept stable and reliable as a whole.

[0042] The principle of the utility model is as follows: after ultrasonic treatment of diamond powder, when the horn 3 needs to be cleaned, the water inlet valve 13 is opened, and water naturally flows into the flushing ring tube 8, passes through the water outlet 9, and finally flows to the surface of the horn 3. At this time, the hand screw bolt 72 is loosened, and the adjustment seat 7 is manually pressed to move up and down repeatedly along the vertical pole 4. In this process, the water flow repeatedly flushes the horn 3, and the brush 10 repeatedly brushes the horn 3, thereby ensuring effective flushing of the horn 3. After flushing, the hand screw bolt 72 is tightened to fix the flushing ring tube 8, and the water inlet valve 13 is closed at this time.

[0043] During the above flushing, the flushed wastewater flows downward into the wastewater tank 16, and the outlet valve 18 is always closed, so that the wastewater is deposited in the wastewater tank 16. After multiple ultrasonic diamond micropowder flushings and multiple horn 3 flushings, the wastewater in the wastewater tank 16 gradually increases. After the diamond micropowder in the wastewater is precipitated, the outlet valve 18 is opened to discharge the wastewater, while the micropowder remains in the wastewater tank 16. At this time, the internal threaded cylinder 20 is rotated to move it downward, the connection between the support rod 19 and the vertical rod 4 is disconnected, the wastewater tank 16 is extracted from the soundproof box 1, and the precipitated diamond micropowder is cleaned. It is also possible not to precipitate the diamond micropowder in the wastewater, and the outlet valve 18 is always kept open, so that the flushed wastewater can be discharged immediately.

[0044] Since the flushing waste water first flows to the operating table 5 and then flows into the waste water tank 16, it is blocked by the operating table 5 and the water may splash. In order to reduce the splashing of water, a hollow operating table 5 is arranged between the waste water tank 16 and the flushing ring pipe 8, that is, a plurality of circular holes 21 penetrating the operating table 5 are opened on the operating table 5, that is, the original operating table 5 is processed into a hollow structure, so that water can flow directly downward through the operating table 5, which facilitates the flow of water and reduces the splashing phenomenon.

[0045] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A cleaning device for a diamond micropowder ultrasonic cell crusher, characterized in that: It comprises a cleaning component elastically slidably connected to the vertical pole (4) and a collecting component arranged at the bottom of the soundproof box (1); The cleaning assembly comprises an adjustment seat (7) and a flushing ring pipe (8) having a water outlet hole (9) and a brush (10) on the inner wall, the adjustment seat (7) being sleeved on the vertical pole (4), the flushing ring pipe (8) being arranged on one side of the adjustment seat (7), the flushing ring pipe (8) being sleeved on the amplitude transformer (3), a water inlet valve (13) being arranged on the top of the soundproof box (1), and a water pipe (14) being connected between the water inlet valve (13) and the flushing ring pipe (8); The collecting assembly comprises a wastewater tank (16), a partition (17) and a water outlet valve (18); a plurality of the partitions (17) are arranged at intervals at the bottom of the wastewater tank (16); the top of the wastewater tank (16) is connected to the water outlet valve (18); a hollow operating table (5) is arranged between the wastewater tank (16) and the flushing ring pipe (8); the operating table (5) is arranged on the vertical pole (4) to be lifted up and down.

2. The cleaning device for the diamond micropowder ultrasonic cell crusher according to claim 1, characterized in that: The adjusting seat (7) and the ring seat body (71) and the hand screw (72) threadedly connected to the ring seat body (71); the ring seat body (71) is sleeved on the vertical pole (4) and slides up and down along the vertical pole (4); the head of the hand screw (72) passes through the ring seat body (71) and is tightly pressed against the side wall of the vertical pole (4); and a compression spring (11) is sleeved on the vertical pole (4) between the ring seat body (71) and the operating table (5).

3. The cleaning device of the diamond micro powder ultrasonic cell crusher according to claim 1, characterized in that: The flushing ring tube (8) is hollow inside to form a flushing cavity (12). The flushing ring tube (8) comprises an inlet section (81) and an outlet section (82) which are interconnected. The inlet section (81) is in the shape of a straight tube, one end of which is connected to the adjustment seat (7) and the other end is connected to the outlet section (82). The outlet section (82) is in the shape of a circular tube. The outlet section (82) is sleeved on the amplitude rod (3), and there is a distance between the inner wall of the outlet section (82) and the amplitude rod (3).

4. The cleaning device for the diamond micropowder ultrasonic cell pulverizer according to claim 3, characterized in that: The inner wall of the water outlet section (82) is provided with a plurality of water outlet holes (9) in a circumferential direction, the water outlet holes (9) face the amplitude transformer (3), and the inner wall of the water outlet section (82) is also provided with the brush (10), the brush (10) is arranged above and below the water outlet holes (9), and the brush (10) contacts the surface of the amplitude transformer (3).

5. The cleaning device for the diamond micropowder ultrasonic cell crusher according to claim 3, characterized in that: A water collecting ring (15) is further provided below the water outlet section (82). The water collecting ring (15) is a circular ring body with a trumpet-shaped cross section. The water collecting ring (15) is sleeved on the amplitude transformer (3). The large diameter end of the water collecting ring (15) is connected and fixed to the water outlet section (82).

6. The cleaning device for the diamond micropowder ultrasonic cell crusher according to claim 3, characterized in that: The water pipe (14) is a bellows expansion pipe, the upper end of the water pipe (14) is connected to the water inlet valve (13), and the lower end of the water pipe (14) is connected to the water inlet section (81) and is connected to the flushing chamber (12).

7. The cleaning device for the diamond micropowder ultrasonic cell pulverizer according to claim 1, characterized in that: The wastewater tank (16) is a rectangular groove structure; the cross-sectional area of ​​the wastewater tank (16) is the same as the cross-sectional area of ​​the soundproof box (1); the partition (17) divides the interior of the wastewater tank (16) into a plurality of spaces; the height of the partition (17) is less than or equal to half the height of the wastewater tank (16); the water outlet valve (18) corresponds to the opening of the side wall of the soundproof box (1), and the water outlet valve (18) extends out of the soundproof box (1); and the operating table (5) is provided with a plurality of circular holes (21) penetrating the operating table (5).

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