Construction waste crushing treatment device

Abstract

The utility model relates to the technical field of construction waste crushing, and discloses a construction waste crushing treatment device which comprises a protective shell, a feeding hole is formed in the middle of the top wall of the protective shell, a funnel groove is fixedly connected to the top of the inner wall of the feeding hole, and a plurality of first bolts are in threaded connection to the four corners of the outer wall of a clamping plate. Rolling gears are rotationally connected to the front side and the rear side of the inner wall of the clamping plate correspondingly, pulleys are fixedly connected to the four corners of the bottom of the storage trolley, and lifting mechanisms are fixedly connected to the front side and the rear side of the outer wall of the protection shell and used for lifting garbage to be smashed. According to the construction waste crushing device, construction waste enters through the funnel groove in the inner wall of the protective shell, the motor drives the grinding gear to grind the construction waste, the remaining construction waste is crushed by the grinding roller again, and the whole crushing process is carried out in the sealed device, so that the efficiency is improved, the noise is reduced, and the environmental pollution is avoided.

Description

Technical Field

[0001] This utility model relates to the field of construction waste crushing technology, and in particular to a construction waste crushing and processing device. Background Technology

[0002] Construction waste crushing and processing equipment is a type of mechanical equipment specifically designed for processing construction waste. This equipment consists of a feeding system, a crushing system, a screening system, a conveying system, and a control system. Its main purpose is to transform construction waste into reusable resources, such as recycled aggregates, recycled bricks, and recycled concrete, thereby achieving the reduction, resource recovery, and harmless treatment of construction waste. It can effectively reduce the pollution of construction waste to the environment, conserve natural resources, and provide a sustainable development solution for the construction industry.

[0003] A search revealed Chinese Patent Publication No. CN118847323A, which discloses a construction waste crushing and processing device. The device includes a support frame, a housing mounted on the support frame, a feed hopper mounted on the housing, a crushing assembly adjacent to the feed hopper, first and second crushing assemblies rotatably supported on the housing, and a screening assembly mounted on the housing. The crushing assembly includes a motor mounted on the housing, a drive wheel mounted on the motor's output shaft, a drive disc mounted on the drive wheel, a fixed rack fixed to the upper side of a slot in the housing, a sliding rack slidably engaged in the slot, a drive gear engaged between the fixed rack and the sliding rack, and a connecting frame mounted on the drive gear. The first connecting rod, hinged between the drive disc and the connecting frame, and the crushing component mounted on the sliding rack, drive the first crushing component to rotate, the first crushing component to rotate, and the second crushing component to drive the screening component to reciprocate relative to the shell. In existing construction waste crushing and processing devices, it mainly uses mechanical force to crush, pulverize, and separate various types of construction waste, such as waste concrete blocks, bricks, tiles, gravel, wood, and plastics, for recycling, reducing the accumulation of construction waste and forming renewable resources. However, during construction, it generates a large amount of impurities and dust, causing a circular impact and reducing construction efficiency. At the same time, it generates a lot of noise during the production process, affecting the construction environment. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a construction waste crushing and processing device, which aims to improve the problems of existing technology that generate impurities and dust that affect the environment, reduce construction efficiency, and cause noise that affects the construction environment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a construction waste crushing and processing device, comprising a protective shell, wherein a feeding hole is provided in the middle of the top wall of the protective shell, a funnel groove is fixedly connected to the top of the inner wall of the feeding hole, a clamping plate is fixedly connected to the bottom of the inner wall of the feeding hole, and multiple bolts are threadedly connected to the four corners of the outer wall of the clamping plate. Crushing gears are rotatably connected to the front and rear sides of the inner wall of the clamping plate, and gears are fixedly connected to the front ends of two crushing gears. A motor is fixedly connected to the front side of the outer wall of the protective shell. A screen is slidably connected to the bottom of the inner wall of the feed hole, and a magnetic stone is fixedly connected to the inner wall of the screen. A fixing groove is installed at the bottom of the protective shell, and a second motor is fixedly connected to the front side of the outer wall of the fixing groove. A third gear is fixedly connected to the output end of the second motor, and a crushing roller is fixedly connected to the front side of the outer wall of the third gear. A storage cart is slidably connected to the bottom of the fixing groove, and pulleys are fixedly connected to the four corners of the bottom of the storage cart. A lifting mechanism is fixedly connected to the front and rear sides of the outer wall of the protective shell. The lifting mechanism is used to lift and lower the waste crusher.

[0006] The above technical solution involves a feed hole at the top of the equipment to ensure smooth entry of construction waste. The waste first enters the funnel trough and is guided to the middle of the crusher. A motor is installed on the front of the outer wall, connected to gears through a transmission device. After the motor starts, the gears rotate at high speed, driving the crushing gears. After the waste enters the crushing zone, clamping plates prevent splashing and ensure safety. The crushing gears crush the waste into small particles, which are then screened through a sieve to separate particles of different sizes. A magnetic stone device is installed on the left side of the sieve to attract ferrous objects. The remaining waste is crushed again to ensure that the particle size meets the requirements. The processed waste falls into a storage cart for recycling. The storage cart is designed for convenient transportation. To adapt to different height requirements, lifting mechanisms are fixed on both sides of the outer wall of the protective shell to improve operational flexibility.

[0007] As a further description of the above technical solution:

[0008] The lifting mechanism includes fixed blocks, which are fixedly connected to the front and rear sides of the outer wall of the protective shell. Hydraulic push rods are fixedly connected to the top of the outer walls of the two fixed blocks. Gear 1 is rotatably connected to the top of the two hydraulic push rods. A fixed plate passes through the upper middle part of the two hydraulic push rods. A chain is fixedly connected to the top left side of the fixed plate. The chain is driven by gear 1. A storage slot is fixedly connected to the other end of the chain. A support rod passes through the left side of the inner wall of the storage slot. The other end of the support rod is fixedly connected to the right side of the outer wall of the protective shell.

[0009] The above technical solution involves placing garbage into a storage trough and activating a hydraulic pusher. This pusher is connected to the protective shell via a fixed block. The extension of the hydraulic pusher causes a gear to rotate, which in turn drives a chain. One end of the chain is fixed to a fixed plate, and the other end is connected to the storage trough. The extension of the hydraulic pusher causes the storage trough to rise and fall. The inner wall of the storage trough has support rods to maintain stability. After the storage trough rises to the top, it tilts to the left, dumping the garbage into the protective shell, thus reducing manpower and improving efficiency.

[0010] As a further description of the above technical solution:

[0011] A fixing strip is fixedly connected to the left side of the outer wall of the storage vehicle, and a pull ring is rotatably connected to the inner wall of the fixing strip.

[0012] The above technical solution involves a fixing strip on the left side of the outer wall of the storage vehicle, and a rotating pull ring on its inner wall, which facilitates transportation and towing.

[0013] As a further description of the above technical solution:

[0014] A handle is installed on the left side of the outer wall of the screen, and four bolts are threadedly connected to the front and rear sides of the outer wall of the handle.

[0015] The above technical solution involves a handle on the left side of the screen, which is fixed to the outer wall by front and rear bolts, making it easy for users to operate and pull the screen.

[0016] As a further description of the above technical solution:

[0017] A rotating shaft is fixedly connected to the top left side of the protective shell, and a cover plate is rotatably connected to the top of the outer wall of the rotating shaft.

[0018] The above technical solution involves connecting the protective shell on the top left side via a pivot, with the top outer wall of the pivot rotating to connect to a cover plate, which improves structural stability and provides additional protection, ensuring that the internal mechanical components are easy to maintain and inspect.

[0019] As a further description of the above technical solution:

[0020] A support frame is fixedly connected to the front side of the outer wall of the protective shell, and two bolts are threadedly connected to the top of the outer wall of the support frame.

[0021] The above technical solution involves a support frame installed on the front of the protective shell, with two threaded bolts at its top to secure the motor and prevent it from shaking excessively.

[0022] As a further description of the above technical solution:

[0023] The outer wall of the protective shell is fixedly connected to the front and rear sides of the bottom, and the outer wall of the fixing groove is fixedly connected to the front and rear sides of the top, and the inner wall of the extension block is threaded with the bolt.

[0024] The above technical solution involves connecting extension blocks to both sides of the bottom of the protective shell and both sides of the top of the fixing groove. The extension blocks are connected to the inner wall by bolts to fix the protective shell and facilitate disassembly and maintenance.

[0025] As a further description of the above technical solution:

[0026] The protective shell is equipped with lifting rings on both the front and rear sides of its top, and the outer walls of the two lifting rings are threaded with five bolts on the left and right sides.

[0027] The above technical solution involves lifting rings on the front and rear sides of the top of the protective shell, which are connected by threaded bolts to facilitate the movement and assembly of the device.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, the top of the protective shell is provided with a feeding hole. Construction waste enters through the funnel groove on the inner wall of the protective shell. The crushed construction waste is crushed by the crushing gear driven by the motor. The crushed waste is initially screened by the screen, and the magnetic stone attracts iron objects. The remaining construction waste is crushed again by the crushing roller and finally falls into the storage vehicle for recycling. The entire crushing process is carried out inside the sealed machine to improve efficiency, reduce noise and avoid environmental pollution.

[0030] 2. In this utility model, when garbage is placed into the storage trough, the hydraulic push rod is activated. The hydraulic push rod extends and drives the gear to rotate. The gear drives the chain on the outer wall. One end of the chain is fixed to the fixed plate, and the other end is connected to the storage trough. The extension of the hydraulic push rod causes the chain to rise and fall, which in turn causes the storage trough connected to the chain to rise and fall. The inner wall of the storage trough is supported by a support rod to keep it stable. After the storage trough rises to the top, it tilts to the left and dumps the garbage into the protective shell. The automated structure reduces the expenditure of manpower, thereby improving the overall work efficiency. Attached Figure Description

[0031] Figure 1 This is a perspective view of a construction waste crushing and processing device proposed in this utility model;

[0032] Figure 2 This is a front view of a construction waste crushing and processing device proposed in this utility model;

[0033] Figure 3 This is a rear view of a construction waste crushing and processing device proposed in this utility model;

[0034] Figure 4 This is a partial structural diagram of a construction waste crushing and processing device proposed in this utility model;

[0035] Figure 5This is a split view of the lifting mechanism of a construction waste crushing and processing device proposed in this utility model.

[0036] Legend:

[0037] 1. Protective shell; 2. Lifting mechanism; 201. Fixing block; 202. Hydraulic push rod; 203. Fixing plate; 204. Gear 1; 205. Chain; 206. Support rod; 207. Storage slot; 3. Feed hole; 4. Funnel slot; 5. Clamping plate; 6. Bolt 1; 7. Rolling gear; 8. Screen; 9. Magnetic stone; 10. Motor 1; 11. Gear 2; 12. Fixing slot; 13. Rolling roller; 14. Gear 3; 15. Motor 2; 16. Storage cart; 17. Pulley; 18. Rotating shaft; 19. Cover plate; 20. Support frame; 21. Bolt 2; 22. Extension block 1; 23. Extension block 2; 24. Bolt 3; 25. Bolt 4; 26. Handle; 27. Pull ring; 28. Lifting ring; 29. ​​Bolt 5; 30. Fixing strip. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Reference Figure 1 , Figure 3 and Figure 4This utility model provides an embodiment of a construction waste crushing and processing device, comprising a protective shell 1, a feed hole 3 in the middle of the top wall of the protective shell 1, a funnel groove 4 fixedly connected to the top of the inner wall of the feed hole 3, a clamping plate 5 fixedly connected to the bottom of the inner wall of the feed hole 3, multiple bolts 6 threadedly connected to the four corners of the outer wall of the clamping plate 5, grinding gears 7 rotatably connected to the front and rear sides of the inner wall of the clamping plate 5, gears 11 fixedly connected to the front ends of the two grinding gears 7, a motor 10 fixedly connected to the front side of the outer wall of the protective shell 1, and a screen 8 slidably connected to the bottom of the inner wall of the feed hole 3, the inner wall of the screen 8 being fixed A magnetic stone 9 is connected to the bottom of the protective shell 1, a fixing groove 12 is installed at the bottom, a motor 2 15 is fixedly connected to the front side of the outer wall of the fixing groove 12, a gear 3 14 is fixedly connected to the output end of the motor 2 15, a crushing roller 13 is fixedly connected to the front side of the outer wall of the gear 3 14, a storage cart 16 is slidably connected to the bottom of the inner wall of the fixing groove 12, pulleys 17 are fixedly connected to the four corners of the bottom of the storage cart 16, a lifting mechanism 2 is fixedly connected to the front and rear sides of the outer wall of the protective shell 1, the lifting mechanism 2 is used to lift the garbage crusher, a fixing strip 30 is fixedly connected to the left side of the outer wall of the storage cart 16, and a pull ring 27 is rotatably connected to the inner wall of the fixing strip 30.

[0040] Specifically, a feed hole 3 is provided at the top of the protective shell 1 to facilitate the smooth entry of construction waste into the equipment. The waste first passes through a funnel trough 4, which guides the waste into the middle of the crusher. A motor is located on the front side of the outer wall of the protective shell 1. The motor drives a set of gears through a transmission device. The gears rotate at high speed under the drive of the motor, thereby driving the crushing gear 7 to work. When the construction waste enters the crushing area, the clamping plate 5 ensures that the waste does not fly around during the crushing process. The crushing gear 7 will crush the waste with great force, crushing it into smaller particles. The crushed waste will be preliminarily screened through the screen 8 to separate particles of different sizes. The magnetic stone 9 device on the left side will pick up ferrous items in the waste to achieve preliminary classification of metals and non-metals. After being processed by the magnetic stone 9, the remaining waste will be crushed again by the crushing roller 13 to ensure that all particles reach the predetermined size. The waste that has been crushed and screened multiple times will fall into the storage cart 16 for recycling. The storage vehicle 16 can conveniently transport the processed garbage to a designated location for further processing or recycling. The outer walls of the protective shell 1 are fixedly connected to the lifting mechanism 2 on the front and rear sides respectively. The main function of the lifting mechanism 2 is to lift the garbage crusher. The left side of the outer wall of the storage vehicle 16 is also fixedly connected to the fixing strip 30. The inner wall of the fixing strip 30 is rotatably connected to the pull ring 27 for easy transportation and dragging.

[0041] Reference Figure 1 and Figure 5The lifting mechanism 2 includes a fixed block 201, which is fixedly connected to the front and rear sides of the outer wall of the protective shell 1. The top of the outer wall of each of the two fixed blocks 201 is fixedly connected to a hydraulic push rod 202. The top of the two hydraulic push rods 202 is rotatably connected to a gear 204. A fixed plate 203 passes through the middle and upper part of the two hydraulic push rods 202. A chain 205 is fixedly connected to the top left side of the fixed plate 203. The chain 205 is connected to the gear 204. The other end of the chain 205 is fixedly connected to a storage slot 207. A support rod 206 passes through the left side of the inner wall of the storage slot 207. The other end of the support rod 206 is fixedly connected to the right side of the outer wall of the protective shell 1. A handle 26 is installed on the left side of the outer wall of the screen 8. Bolts 25 are threadedly connected to the front and rear sides of the outer wall of the handle 26. A rotating shaft 18 is fixedly connected to the top left side of the top of the protective shell 1. A cover plate 19 is rotatably connected to the top of the outer wall of the rotating shaft 18.

[0042] Specifically, the worker places the garbage into the storage trough 207 and activates the hydraulic push rod 202. This push rod is connected to the protective shell 1 via the fixing block 201. The hydraulic push rod 202 extends and pushes the gear 204 to rotate. The gear drives the chain 205, one end of which is fixed to the fixing plate 203, and the other end is connected to the storage trough 207. The extension of the hydraulic push rod 202 causes the chain 205 to rise and fall, resulting in the rise and fall of the storage trough 207. The inner wall of the storage trough 207 is supported by a support rod 206 to maintain stability. After the storage trough 207 rises to the top, it tilts to the left, allowing the garbage to be dumped into it. The protective shell 1 reduces manpower and improves efficiency. A handle 26 is installed on the left side of the outer wall of the screen 8. The handle 26 is fixed to the outer wall of the screen 8, and fixing bolts 25 are installed on both the front and rear sides, so that the user can control the screen 8 during use. A rotating shaft 18 is fixedly connected to the top left side of the protective shell 1. A cover plate 19 is rotatably connected to the top outer wall of the rotating shaft 18, which enhances the overall structural stability of the protective shell 1 and provides additional protection to ensure the internal mechanical parts are safe for daily maintenance and inspection.

[0043] Reference Figure 1 , Figure 2 and Figure 3 A support frame 20 is fixedly connected to the front side of the outer wall of the protective shell 1. Bolt 21 is threadedly connected to the top of the outer wall of the support frame 20. Extension block 1 22 is fixedly connected to the front and rear sides of the bottom of the outer wall of the protective shell 1. Extension block 23 is fixedly connected to the front and rear sides of the top of the outer wall of the fixing groove 12. Bolt 3 24 is threadedly connected to the inner wall of extension block 23. Lifting rings 28 are installed on the front and rear sides of the top of the protective shell 1. Bolt 5 29 is threadedly connected to the left and right sides of the outer walls of the two lifting rings 28.

[0044] Specifically, a support frame 20 is fixedly connected to the front side of the outer wall of the protective shell 1. The top of the outer wall of the support frame 20 is connected to a threaded bolt 21 for fixing and stabilizing the motor to prevent excessive shaking. Extension blocks 22 are fixedly connected to the front and rear sides of the bottom of the outer wall of the protective shell 1. Extension blocks 23 are also fixedly connected to the top of the outer wall of the fixing groove 12 on the front and rear sides. A bolt 3 24 is connected to the inner wall of extension block 23 by thread to fix the protective shell 1 and the fixing groove 12, which facilitates disassembly and maintenance. Lifting rings 28 are installed on the top of the protective shell 1 on the front and rear sides. Bolts 5 29 are connected to the left and right sides of the outer wall of the two lifting rings 28 by thread. The lifting rings 28 can be used to move and assemble the device.

[0045] Working principle: The top of the protective shell 1 has a feed hole 3. Construction waste is placed into the feed hole 3 and passes through a funnel groove 4 fixed to the inner wall of the feed hole 3. A motor 10 is fixedly connected to the front side of the outer wall of the feed hole 3. A gear 11 is fixedly connected to the output end of the motor 10. The two gears 11 mesh and rotate simultaneously, driving the crushing gear 7 fixedly connected to the rear side. The waste passes between the two crushing gears 7. The crushing gear 7 is rotatably connected to the inner wall of the clamping plate 5. The outer wall of the clamping plate 5 is secured by bolts 6 to enhance the crushing firmness. After crushing, large pieces of waste are crushed. The waste is then crushed by the sliding connection at the bottom of the feed hole 3. The screen 8 is used for initial screening, and the magnetic stone 9 installed on the inner wall of the screen 8 sucks up the iron objects inside. The remaining waste continues to flow downward and is crushed into powder by two crushing rollers 13. The crushing rollers 13 are driven by motor 2 15 to drive gear 3 14 fixedly connected to the output end. The two gears 3 14 mesh and rotate simultaneously, driving the crushing rollers 13 fixedly connected to the rear side. The waste falls into the storage car 16 for recycling. The entire crushing process is carried out inside the machine to increase the sealing, avoid impurities and dust from affecting the environment, improve construction efficiency, and reduce construction noise.

[0046] Workers place garbage into the storage trough 207 and activate the hydraulic push rod 202. The hydraulic push rod 202 is fixed to the front and rear sides of the outer wall of the protective shell 1 by the fixing block 201. When the hydraulic push rod 202 extends, it drives the top rotating gear 204 to rotate upward. The outer wall of the gear 204 is meshed with a chain 205. Because one end of the chain 205 is fixed to the top of the outer wall of the fixing plate 203, which is fixed to the front and rear sides of the outer wall of the protective shell 1, and the other end of the chain 205 is connected to the left side of the outer wall of the storage trough 207, when the hydraulic push rod 202 extends, the unfixed chain 205 on the right side will rise and fall, thereby raising and lowering the storage trough 207. The inner wall of the storage trough 207 is pierced by a support rod 206 to maintain stability during the raising and lowering. When the storage trough 207 rises to the top, it will tilt to the left, thus dumping the garbage into the protective shell 1, reducing labor costs and improving work efficiency.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A construction waste crushing and processing device, comprising a protective shell (1), characterized in that: The protective shell (1) has a feed hole (3) in the middle of its top wall. A funnel groove (4) is fixedly connected to the top of the inner wall of the feed hole (3). A clamping plate (5) is fixedly connected to the bottom of the inner wall of the feed hole (3). Multiple bolts (6) are threaded to the four corners of the outer wall of the clamping plate (5). Rolling gears (7) are rotatably connected to the front and rear sides of the inner wall of the clamping plate (5). Gears (11) are fixedly connected to the front ends of the two rolling gears (7). A motor (10) is fixedly connected to the front side of the outer wall of the protective shell (1). A screen (8) is slidably connected to the bottom of the inner wall of the feed hole (3). A magnetic stone (9) is fixedly connected to the inner wall. A fixed groove (12) is installed at the bottom of the protective shell (1). A motor (15) is fixedly connected to the front side of the outer wall of the fixed groove (12). A gear (14) is fixedly connected to the output end of the motor (15). A crushing roller (13) is fixedly connected to the front side of the outer wall of the gear (14). A storage cart (16) is slidably connected to the bottom of the inner wall of the fixed groove (12). A pulley (17) is fixedly connected to the four corners of the bottom of the storage cart (16). A lifting mechanism (2) is fixedly connected to the front and rear sides of the outer wall of the protective shell (1). The lifting mechanism (2) is used to lift and shred garbage.

2. The construction waste crushing and processing device according to claim 1, characterized in that: The lifting mechanism (2) includes a fixed block (201), which is fixedly connected to the front and rear sides of the outer wall of the protective shell (1). The top of the outer wall of the two fixed blocks (201) is fixedly connected to a hydraulic push rod (202). The top of the two hydraulic push rods (202) is rotatably connected to a gear (204). The upper middle part of the two hydraulic push rods (202) is penetrated by a fixed plate (203). The top left side of the fixed plate (203) is fixedly connected to a chain (205). The chain (205) is connected to the gear (204) for transmission. The other end of the chain (205) is fixedly connected to a storage slot (207). The left side of the inner wall of the storage slot (207) is penetrated by a support rod (206). The other end of the support rod (206) is fixedly connected to the right side of the outer wall of the protective shell (1).

3. The construction waste crushing and processing device according to claim 1, characterized in that: A fixing strip (30) is fixedly connected to the left side of the outer wall of the storage vehicle (16), and a pull ring (27) is rotatably connected to the inner wall of the fixing strip (30).

4. The construction waste crushing and processing device according to claim 1, characterized in that: A handle (26) is installed on the left side of the outer wall of the screen (8), and four bolts (25) are threadedly connected to the front and rear sides of the outer wall of the handle (26).

5. The construction waste crushing and processing device according to claim 1, characterized in that: A rotating shaft (18) is fixedly connected to the top left side of the protective shell (1), and a cover plate (19) is rotatably connected to the top of the outer wall of the rotating shaft (18).

6. The construction waste crushing and processing device according to claim 1, characterized in that: A support frame (20) is fixedly connected to the front side of the outer wall of the protective shell (1), and a bolt (21) is threadedly connected to the top of the outer wall of the support frame (20).

7. The construction waste crushing and processing device according to claim 1, characterized in that: The protective shell (1) has extension blocks 1 (22) fixedly connected to the bottom front and rear sides of the outer wall, and extension blocks 2 (23) fixedly connected to the top front and rear sides of the outer wall of the fixing groove (12), and bolts 3 (24) are threadedly connected to the inner wall of extension blocks 2 (23).

8. The construction waste crushing and processing device according to claim 1, characterized in that: The protective shell (1) is equipped with lifting rings (28) on the front and rear sides of the top, and bolts (29) are threadedly connected to the left and right sides of the outer walls of the two lifting rings (28).

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