A dust removal device for a construction waste crusher

Abstract

This utility model provides a dust removal device for a construction waste crusher, belonging to the technical field of dust removal devices. It includes a crusher, a conical discharge pipe, a feed hopper, a conical hood, a first cyclone separator, a second cyclone separator, a cartridge dust collector, a dust collection structure, and a negative pressure fan. The negative pressure fan draws dust into the first cyclone separator through the conical hood, which is connected to the side wall of the crusher. The first cyclone separator removes heavier coarse dust particles. The remaining dust is then separated by the second cyclone separator, which removes the remaining heavier coarse dust particles. The remaining fine dust enters the cartridge dust collector for filtration. Lighter dust remaining inside the crusher floats to the feed hopper and is mostly fed into the second cyclone separator through the dust collection structure. The second cyclone separator and the cartridge dust collector work together to remove dust, effectively preventing dust from overflowing from the feed hopper during crushing and avoiding dust pollution when the crushed construction waste is discharged.

Description

Technical Field

[0001] This utility model relates to the field of dust removal device technology, and in particular to a dust removal device for a construction waste crusher. Background Technology

[0002] The descriptions in this section provide background information relating to this disclosure and do not constitute prior art.

[0003] Construction waste is generated during construction. To facilitate the disposal of construction waste, a shredder is used to shred it. The shredding process generates a large amount of dust, which overflows and affects the construction environment. At the same time, a lot of dust adheres to the surface of the shredded construction waste inside the shredder, causing dust pollution when the shredded construction waste is discharged, which endangers the health of workers. Utility Model Content

[0004] The purpose of this utility model is to provide a dust removal device for a construction waste crusher, which has the advantages of negative pressure suction and filtration to remove dust inside the crusher, and suction and filtration to remove residual dust drifting to the feed hopper of the crusher. This solves the technical problem of a large amount of dust overflowing when the crusher crushes construction waste, and a lot of dust adhering to the surface of the crushed construction waste, which causes dust pollution when the crushed construction waste is discharged.

[0005] This utility model provides a dust removal device for a construction waste crusher, comprising: The crusher has a conical discharge pipe at its lower end and a feed hopper at its upper end; The side wall of the crusher is fixedly connected to a conical cover, and the middle of its outer wall is fixedly connected to a first cyclone separator; A metal mesh plate is fixed inside the conical cover that connects to the crusher; The upper output end of the first cyclone separator is fixedly connected to the second cyclone separator; The upper output end of the second cyclone separator is fixedly connected to a filter cartridge dust removal device; The feed hopper is equipped with a dust collection structure, and its output end is fixedly connected to the input end of the second cyclone separator through a pipe. A negative pressure fan is fixedly connected between the second cyclone separator and the filter cartridge dust collector.

[0006] As a further optimization, in order to collect the dust entering the feed hopper and further reduce dust overflow, the dust collection structure includes: The first annular tube is fixedly assembled to the inner wall of the feed hopper; The inner circumferential surface of the first annular tube is uniformly provided with air inlet holes; The outer wall of the first annular pipe is fixedly connected to one end of the first exhaust pipe, and the other end of the first exhaust pipe passes through the feed hopper and is fixedly connected to the input end of the second cyclone separator.

[0007] As a further optimization, in order to further enhance the collection of dust in the feed hopper, the air inlet holes are circumferentially distributed on the inner annular surface of the first annular tube to form an air inlet hole group. The air intake vents are distributed in three groups: upper, middle, and lower.

[0008] As a further optimization, in order to provide negative pressure suction and enhance the suction effect on dust, a negative pressure fan is fixedly connected between the first cyclone separator and the second cyclone separator.

[0009] As a further optimization, in order to adsorb and remove harmful substances in the exhaust gas, the upper output end of the filter cartridge dust collector is fixedly connected to a terminal processing device. The terminal processing device includes: The assembly box has an activated carbon adsorption layer installed in the middle. The activated carbon adsorption layer separates the upper and lower sides of the inner cavity of the splicing box. The upper end of the outer wall of the splicing box is fixedly connected to one end of the first air inlet pipe, and the other end of the first air inlet pipe is fixedly connected to the upper output end of the filter cartridge dust collector. The lower end of the outer wall of the splicing box is fixedly connected to a second exhaust pipe.

[0010] As a further optimization, to facilitate the disassembly and assembly of the housing when needed for cleaning and maintenance of the activated carbon adsorption layer inside, the housing includes: The box body has a cover plate fixedly connected to its upper opening by bolts; The activated carbon adsorption layer is assembled in the middle of the inner cavity of the box.

[0011] As a further optimization, in order to achieve the limiting installation of the activated carbon adsorption layer, a limiting ring is fixedly assembled at the lower end of the inner cavity of the box. The lower end of the activated carbon adsorption layer abuts against the upper end of the limiting ring.

[0012] As a further optimization, in order to filter and remove the fine dust separated from the cyclone separator, the cartridge dust collector includes: The outer cylinder has a discharge hopper fixedly connected to its lower end, and a valve is provided at the lower end of the discharge hopper; A top plate is fixedly mounted at the upper opening of the outer cylinder by bolts, and a third exhaust pipe is fixedly connected to the middle of its top surface. The side wall of the discharge hopper is fixedly connected to a third air inlet pipe; The inner wall of the discharge hopper is coaxially and fixedly connected to a guide cylinder; A connecting cylinder is fixedly assembled in the middle of the bottom surface of the top plate, and a filter element is fixedly connected to its lower end. The outer wall of the filter element is provided with a cylindrical shell; The lower end of the filter element is connected to the upper end of the guide tube.

[0013] As a further optimization, in order to perform reverse blowing cleaning of the crushed construction waste inside the crusher and further reduce the dust adsorbed on the surface of the crushed construction waste, the outer wall of the conical discharge pipe is equipped with a reverse blowing cleaning structure, which includes: The second annular tube has three longitudinally distributed parts, and the three second annular tubes are fixedly assembled to the outer wall of the conical discharge tube. The inner surface of the second annular tube is uniformly and fixedly connected with nozzles, and the nozzles extend upward at an angle into the interior of the conical discharge tube; A gas collection component, which is fixedly connected to the outer wall of the second annular tube by a connecting pipe; An air pump is fixedly connected to the outer wall of the gas receiving component.

[0014] As a further optimization, in order to facilitate backflushing and cleaning of the filter element, a pulse cleaning device is fixedly connected to the upper end of the outer wall of the outer cylinder, and its output end extends into the connecting cylinder.

[0015] This utility model provides an improved dust removal device for a construction waste crusher, which has the following improvements and advantages compared with the prior art: A dust removal device for a construction waste crusher uses a negative pressure fan as a power source. Dust is drawn into a first cyclone separator through a conical hood connected to the side wall of the crusher. A metal mesh plate at the end of the conical hood blocks the splashing of crushed construction waste. The first cyclone separator removes heavier coarse dust particles. The remaining dust is then separated by a second cyclone separator to remove the remaining heavier coarse dust particles. The remaining fine dust enters a cartridge dust collector for filtration. The lighter dust remaining inside the crusher drifts to the feed hopper and is mostly collected by a dust collection structure. This dust is then fed into the second cyclone separator. The second cyclone separator and the cartridge dust collector work together to remove dust, effectively preventing dust from overflowing from the feed point during crusher operation and avoiding dust pollution caused by excessive dust adhering to the surface of the crushed construction waste when it is discharged. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 is a schematic diagram of the structure of this utility model; Figure 2 is a schematic diagram of the dust collection structure of this utility model; Figure 3 is a schematic cross-sectional view of the terminal processing device of this utility model; Figure 4 is a schematic cross-sectional view of the filter cartridge dust removal device of this utility model; Figure 5 is a schematic diagram of the back-flushing cleaning structure of this utility model; Figure 6 is a schematic diagram of the internal metal mesh plate assembly structure of the conical cover of this utility model; Explanation of reference numerals in the attached drawings: 1-Crusher, 2-Backflush cleaning structure, 21-Second annular pipe, 22-Gas collection component, 23-Air pump, 24-Connecting pipe, 25-Nozzle, 3-Conical hood, 4-First cyclone separator, 5-Second cyclone separator, 6-Cartridge dust collector, 61-Outer cylinder, 62-Third air inlet pipe, 63-Guide cylinder, 64-Filter element, 65-Third exhaust pipe, 66-Connecting cylinder, 7-Pulse cleaning device, 8-Terminal treatment device, 81-Box body, 82-First air inlet pipe, 83-Second exhaust pipe, 84-Cover plate, 85-Limiting ring, 86-Activated carbon adsorption layer, 9-Negative pressure fan, 10-Feed hopper, 11-Dust collection structure, 111-First annular pipe, 112-Air inlet hole, 113-First exhaust pipe, 12-Conical discharge pipe. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Please refer to Figures 1-6. This utility model provides a technical solution: a dust removal device for a construction waste crusher, comprising: The crusher 1 has a conical discharge pipe 12 at its lower end and a feed hopper 10 at its upper end; The side wall of the crusher 1 is fixedly connected to a conical cover 3, and the middle of its outer wall is fixedly connected to a first cyclone separator 4; A metal mesh plate is fixed inside the end of the conical cover 3 that connects to the crusher 1; The upper output end of the first cyclone separator 4 is fixedly connected to the second cyclone separator 5; The upper output end of the second cyclone separator 5 is fixedly connected to a filter cartridge dust removal device 6; The feed hopper 10 is equipped with a dust collection structure 11, the output end of which is fixedly connected to the input end of the second cyclone separator 5 through a pipe; A negative pressure fan 9 is fixedly connected between the second cyclone separator 5 and the cartridge dust collector 6.

[0022] Specifically, in this embodiment, the crusher 1 is the prior art, specifically a roller crusher with two rollers, used for crushing construction waste, the feed hopper 10 is used for feeding construction waste, and the discharge hopper 12 is used for discharging the crushed construction waste; The first cyclone separator 4 and the second cyclone separator 5 are both applications of existing cyclone separator technology; the negative pressure fan 9 is existing technology, used to generate negative pressure suction, and its two ends are connected to the pipeline through tapered pipes; Furthermore, the device uses a negative pressure fan 9 as a power source. Dust is drawn into the first cyclone separator 4 through the conical hood 3 connected to the side wall of the crusher 1. The metal mesh plate at the end of the conical hood 3 blocks the splashing crushed construction waste. The first cyclone separator 4 separates and removes the heavier dust particles. The remaining dust then passes through the second cyclone separator 5 to separate the remaining heavier dust particles. The remaining fine dust enters the cartridge dust collector 6 for filtration. More specifically, most of the lighter dust remaining inside the crusher is collected by the dust collection structure 11 after drifting to the feed hopper 10. The dust is then fed into the second cyclone separator 5 through the dust collection structure 11. The dust is filtered out by the second cyclone separator 5 and the filter cartridge dust removal device 6, effectively preventing dust from overflowing from the feed point when the crusher is working. Understandably, valves can be selectively installed on the pipelines connecting various components to control the connectivity of the pipelines. The valves include wear-resistant ceramic discharge valves, which are suitable for conveying dust.

[0023] In some embodiments, the dust collection structure 11 includes: The first annular tube 111 is fixedly assembled to the inner wall of the feed hopper 10; The inner annular tube 111 has air inlet holes 112 evenly opened on its inner annular surface; The outer wall of the first annular pipe 111 is fixedly connected to one end of the first exhaust pipe 113, and the other end of the first exhaust pipe 113 passes through the feed hopper 10 and is fixedly connected to the input end of the second cyclone separator 5.

[0024] Specifically in this embodiment, the first annular pipe 111 is distributed along the inner wall of the feed hopper 10. The first annular pipe 111 is fixedly connected to the input end of the second cyclone separator 5 through the first exhaust pipe 113. The negative pressure suction generated by the negative pressure fan 9 acts along the pipeline inside the first annular pipe 111, and finally acts at the air inlet hole 112 on the outer wall of the first annular pipe 111, sucking the dust in the feed hopper 10 from the air inlet hole 112. Furthermore, the air intake holes 112 are evenly and densely distributed along the inner annular surface of the first annular tube 111, which better draws in dust; It is understandable that the dust collection structure 11 cannot guarantee that the gas discharged from the feed hopper 10 is completely dust-free, but it can remove most of the dust, and the residual trace dust has a negligible impact on the staff.

[0025] In some embodiments, the air inlet holes 112 are circumferentially distributed on the inner annular surface of the first annular tube 111 to form an air inlet hole group; There are three groups of air intake holes distributed at the top, middle and bottom. By increasing the number of air intake holes, the dust collection range is expanded. Under the premise of sufficient negative pressure suction, the amount of dust collected by the dust collection structure is further enhanced, and the content of fine dust in the exhaust gas is reduced.

[0026] In some embodiments, a negative pressure fan 9 is fixedly connected between the first cyclone separator 4 and the second cyclone separator 5. By adding the negative pressure fan 9, the negative pressure suction during dust removal is enhanced, and the content of fine dust in the exhaust gas is further reduced.

[0027] In some embodiments, the upper output end of the cartridge dust collector 6 is fixedly connected to a terminal processing device 8; Terminal processing device 8 includes: The assembled box body has an activated carbon adsorption layer 86 installed in the middle. Activated carbon adsorption layer 86 separates the upper and lower sides of the inner cavity of the splicing box; The upper end of the outer wall of the splicing box is fixedly connected to one end of the first air inlet pipe 82, and the other end of the first air inlet pipe 82 is fixedly connected to the upper output end of the filter cartridge dust removal device 6; The lower end of the outer wall of the splicing box is fixedly connected to a second exhaust pipe 83.

[0028] Specifically, in this embodiment, the exhaust air enters through the first intake pipe 82, passes through the activated carbon adsorption layer 86, and is discharged from the second exhaust pipe 83. During the process of passing through the activated carbon adsorption layer 86, the harmful substances in the air can be removed by utilizing the adsorption properties of the activated carbon itself.

[0029] Understandably, the modular design allows the enclosure to be disassembled, facilitating the inspection and maintenance of internal components.

[0030] In some embodiments, the modular enclosure includes: The box body 81 has a cover plate 84 fixedly connected to its upper opening by bolts; The activated carbon adsorption layer 86 is assembled in the middle of the inner cavity of the box 81. After removing the bolts, the cover plate 84 can be removed from the box 81. The installation can be done in reverse, which makes it more convenient to inspect and maintain the activated carbon adsorption layer 86 inside the box 81.

[0031] In some embodiments, a limit ring 85 is fixedly assembled at the lower end of the inner cavity of the box body 81; The lower end of the activated carbon adsorption layer 86 abuts against the upper end of the limiting ring 85. The limiting ring 85 is used to support the placement of the activated carbon adsorption layer 86, so that the activated carbon adsorption layer 86 can be placed in the middle of the inner cavity of the box 81.

[0032] In some embodiments, the cartridge dust collector 6 includes: The outer cylinder 61 has a discharge hopper fixedly connected to its lower end, and a valve is provided at the lower end of the discharge hopper; A top plate is fixedly mounted at the upper opening of the outer cylinder 61 by bolts, and a third exhaust pipe 65 is fixedly connected to the middle of its top surface; A third air inlet pipe 62 is fixedly connected to the side wall of the discharge hopper; A guide tube 63 is coaxially and fixedly connected to the inner wall of the discharge hopper; A connecting cylinder 66 is fixedly assembled in the middle of the bottom surface of the top plate, and a filter element 64 is fixedly connected to its lower end; The outer wall of filter element 64 is provided with a cylindrical shell; The lower end of filter element 64 is snapped into connection with the upper end of guide tube 63.

[0033] Specifically in this embodiment, the air enters from the discharge hopper along the third air inlet pipe 62, and enters the filter element 64 along the guide tube 63; the filter element 64 is provided with a cylindrical shell on the outside, and the gas enters the connecting tube 66 after passing through the middle of the filter element 64, and finally enters the third exhaust pipe 65 from the connecting tube 66 and is discharged. Furthermore, the valve at the lower end of the discharge hopper is closed when air is introduced through the third air inlet pipe 62, and is opened after the device is used to discharge the dust filtered by the filter element 64.

[0034] In some embodiments, the outer wall of the tapered discharge pipe 12 is fitted with a backflushing cleaning structure 2, which includes: The second annular tube 21 has three longitudinally distributed parts, and the three second annular tubes 21 are fixedly assembled to the outer wall of the conical discharge tube 12; The inner annular tube 21 has nozzles 25 uniformly fixedly connected to it, and the nozzles 25 extend upward at an angle into the interior of the conical discharge tube 12. Gas collection component 22, which is fixedly connected to the outer wall of the second annular tube 21 by a connecting pipe 24; The outer wall of the gas collection component 22 is fixedly connected to the air pump 23.

[0035] Specifically in this embodiment, the air pump 23 is connected to an external power source and is used to blow air into the gas collection component 22. The gas collection component 22 is specifically a hollow rectangular block, whose inner wall space is used to temporarily store air, and the air is discharged into the second annular pipe 21 through the connecting pipe 24. Furthermore, the air entering the second annular pipe 21 is sprayed obliquely upward through the nozzle 25 onto the crushed construction waste in the crusher 1, blowing off the dust adhering to the surface of the crushed construction waste. The blown-off dust is then sucked away by negative pressure suction, thus better removing the dust adhering to the surface of the crushed construction waste. Understandably, nozzle 25 is made of hard alloy steel, which has good wear resistance.

[0036] In some embodiments, a pulse cleaning device 7 is fixedly connected to the upper end of the outer wall of the outer cylinder 61, and its output end extends into the connecting cylinder 66. The pulse cleaning device 7 is a prior art and is the core component of the pulse dust collector. When in use, it works with an external pulse controller and an air tank. During cleaning, the pulse controller sequentially triggers each control valve to open the pulse valve. The compressed air in the air tank is sprayed from each hole of the blowpipe through the venturi tube onto the corresponding filter element 64, and the filter element 64 is cleaned by reverse airflow.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A dust removal device for a construction waste crusher, characterized in that, include: The crusher (1) has a conical discharge pipe (12) at its lower end and a feed hopper (10) at its upper end. The crusher (1) has a conical cover (3) fixedly connected to the middle of its side wall, and a first cyclone separator (4) fixedly connected to the middle of its outer wall. A metal mesh plate is fixed inside the end of the conical cover (3) that connects to the crusher (1); The upper output end of the first cyclone separator (4) is fixedly connected to the second cyclone separator (5); The upper output end of the second cyclone separator (5) is fixedly connected to a filter cartridge dust removal device (6); The feed hopper (10) is equipped with a dust collection structure (11), and its output end is fixedly connected to the input end of the second cyclone separator (5) through a pipe; A negative pressure fan (9) is fixedly connected between the second cyclone separator (5) and the filter cartridge dust collector (6).

2. The dust removal device for a construction waste crusher according to claim 1, characterized in that, The dust collection structure (11) includes: The first annular tube (111) is fixedly assembled to the inner wall of the feed hopper (10); The inner annular surface of the first annular tube (111) is uniformly provided with air inlet holes (112); The outer wall of the first annular pipe (111) is fixedly connected to one end of the first exhaust pipe (113), and the other end of the first exhaust pipe (113) passes through the feed hopper (10) and is fixedly connected to the input end of the second cyclone separator (5).

3. A dust removal device for a construction waste crusher according to claim 2, characterized in that, The air inlet holes (112) are circumferentially distributed on the inner annular surface of the first annular tube (111) to form an air inlet hole group; The air intake vents are distributed in three groups: upper, middle, and lower.

4. A dust removal device for a construction waste crusher according to claim 1, characterized in that, A negative pressure fan (9) is fixedly connected between the first cyclone separator (4) and the second cyclone separator (5).

5. A dust removal device for a construction waste crusher according to claim 1, characterized in that... Therefore, the upper output end of the filter cartridge dust removal device (6) is fixedly connected to a terminal processing device (8). The terminal processing device (8) includes: The spliced ​​box body is equipped with an activated carbon adsorption layer (86) in the middle. The activated carbon adsorption layer (86) separates the upper and lower sides of the inner cavity of the splicing box; The upper end of the outer wall of the splicing box is fixedly connected to one end of the first air inlet pipe (82), and the other end of the first air inlet pipe (82) is fixedly connected to the upper output end of the filter cartridge dust removal device (6); The lower end of the outer wall of the splicing box is fixedly connected to a second exhaust pipe (83).

6. A dust removal device for a construction waste crusher according to claim 5, characterized in that, The assembly box includes: The box body (81) has a cover plate (84) fixedly connected to its upper opening by bolts. The activated carbon adsorption layer (86) is assembled in the middle of the inner cavity of the box body (81).

7. A dust removal device for a construction waste crusher according to claim 6, characterized in that, A limit ring (85) is fixedly assembled at the lower end of the inner cavity of the box (81). The lower end of the activated carbon adsorption layer (86) abuts against the upper end of the limiting ring (85).

8. A dust removal device for a construction waste crusher according to claim 1, characterized in that, The filter cartridge dust removal device (6) includes: The outer cylinder (61) has a discharge hopper fixedly connected to its lower end, and a valve is provided at the lower end of the discharge hopper; A top plate is bolted to the upper opening of the outer cylinder (61), and the top surface is fixed in the middle. The fixed connection has a third exhaust pipe (65); The side wall of the discharge hopper is fixedly connected to a third air inlet pipe (62). The inner wall of the discharge hopper is coaxially and fixedly connected to a guide tube (63). A connecting cylinder (66) is fixedly assembled in the middle of the bottom surface of the top plate, and a filter element (64) is fixedly connected to its lower end. The filter element (64) has a cylindrical shell on its outer wall; The lower end of the filter element (64) is connected to the upper end of the guide tube (63).

9. A dust removal device for a construction waste crusher according to claim 1, characterized in that, The outer wall of the conical discharge pipe (12) is equipped with a backflushing cleaning structure (2), which includes: The second annular tube (21) has three longitudinally distributed parts, and the three second annular tubes (21) are fixedly assembled on the outer wall of the conical discharge tube (12); The inner ring surface of the second annular tube (21) is uniformly connected to a nozzle (25), and the nozzle (25) extends upward at an angle into the interior of the conical discharge tube (12); The gas collection component (22) is fixedly connected to the outer wall of the second annular tube (21) by a connecting pipe (24). The gas receiving component (22) has an air pump (23) fixedly connected to its outer wall.

10. A dust removal device for a construction waste crusher according to claim 8, characterized in that, The upper end of the outer wall of the outer cylinder (61) is fixedly connected to a pulse cleaning device (7), the output end of which extends into the connecting cylinder (66).

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