Waste treatment device for house building engineering

Abstract

The utility model relates to the technical field of house construction engineering, and discloses a waste treatment device for house construction engineering, which comprises a machine body, the machine body comprises a classification component and a grinding component, the classification component comprises a conveying belt, the outer surface of the conveying belt is fixedly connected with a plurality of flexible magnetic strips, a sieve plate is arranged in the machine body, and the grinding component is arranged in the machine body. The inner wall of the machine body is fixedly connected with a first vibration motor. According to the waste treatment device for the house building engineering, through cooperation of the installed conveying belt and the flexible magnetic strips, metal parts are attracted through magnetism, concrete is evenly spread in combination with a vibration motor, it is ensured that metal waste is tightly attracted, thorough separation of metal and concrete is achieved, non-magnetic metal is further separated through a sieve plate, and the waste treatment effect is improved. The waste treatment efficiency is improved, recoverable materials such as reinforcing steel bars and copper are recycled, dust raising is effectively prevented through the sealing plate, the working environment is protected, concrete particles are finely ground through the grinding roller and the grinding frame, and the waste reutilization rate is increased.

Description

Technical Field

[0001] This utility model relates to the field of building construction engineering technology, specifically to a waste treatment device for building construction engineering. Background Technology

[0002] Building construction engineering refers to a series of engineering activities involving the planning, design, construction, and maintenance of buildings such as residential buildings, commercial buildings, and public facilities. It covers the entire process from project initiation, feasibility study, architectural design, structural design, construction management to final acceptance. Building construction engineering not only includes the main structure of the building (such as foundation, walls, floors, roof, etc.), but also involves the installation and commissioning of supporting facilities such as electrical, water supply and drainage, heating, ventilation, air conditioning, and fire protection.

[0003] An existing patent (publication number: CN213762232U) discloses a waste treatment device for building construction projects, including a base, a treatment chamber at the top of the base, a water tank on one side of the treatment chamber, a fine processing chamber at the bottom inside the treatment chamber, a motor A at one end inside the fine processing chamber, a rotating shaft at the output end of the motor A, six sets of stirring and screening screens on the outside of the rotating shaft, and grinding rods that cooperate with the fine processing chamber are hinged to the opposite sides of the six sets of stirring and screening screens. A water pump connected to the top of the water tank is provided, and a water pipe is provided at the output end of the water pump. This utility model can crush waste materials through the cooperation of motor B and crushing rollers, making the waste materials convenient for secondary use. Through the cooperation of internal threaded sleeve, bidirectional threaded rod, slide groove, slider and throttle, the spacing of the crushing rollers can be adjusted according to the needs, so as to change the degree of crushing.

[0004] The aforementioned document allows for adjustment of the crushing roller spacing to alter the crushing degree through the combination of internal threaded sleeve, bidirectional threaded rod, slide groove, slider, and throttle. However, it lacks the ability to separate metallic substances from waste materials, requiring the recyclable materials to be extracted before placing the waste into the processing chamber, a cumbersome process. Furthermore, using water spraying to reduce dust inside the device can cause concrete to mix with water and adhere to the inner wall of the device during crushing, leading to subsequent cleaning difficulties. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a waste treatment device for building construction projects, which has the advantages of recycling materials and separating them separately, thus solving the problems mentioned in the background technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste treatment device for building construction projects, comprising a body, wherein the body includes a sorting component and a grinding component;

[0007] The sorting component includes a conveyor belt, with multiple flexible magnetic strips fixedly connected to the outer surface of the conveyor belt. A sieve plate is provided inside the machine body, and a vibration motor is fixedly connected to the inner wall of the machine body. A bearing plate is fixedly connected to the output end of the vibration motor, and the bearing plate is in contact with the conveyor belt.

[0008] The grinding assembly includes a rotating rod that is rotatably connected to the inner wall of the machine body. A grinding roller is fixedly connected to the outer surface of the rotating rod. Two grinding frames are fixedly connected to the inner wall of the machine body. Two sealing plates are hinged to the upper end of the machine body. The two sealing plates are in contact with each other. A spring is fixedly connected to the bottom of each of the two sealing plates. Both springs are fixedly connected to the inner wall of the machine body.

[0009] The above solution allows for the installation of a sealing plate, which quickly seals the top of the machine after concrete waste is poured into it, effectively preventing dust generated during the crushing process and avoiding pollution to the surrounding working environment.

[0010] Furthermore, each of the two grinding frames has a water inlet pipe fixedly connected to its opposite side, both water inlet pipes completely penetrate the machine body, and a valve is installed at the end of each water inlet pipe away from the machine body.

[0011] The above solution allows for the injection of cooling water into the grinding frame through the installation of a water inlet pipe. This cooling water helps to cool the grinding rollers and the grinding frame, preventing them from overheating during the grinding of concrete waste and affecting the service life of the grinding frame.

[0012] Furthermore, a second vibration motor is installed on the inner wall of the machine body, and a transmission plate is hinged to the output end of the second vibration motor. The other end of the transmission plate is hinged to the bottom of the sieve plate.

[0013] Through the above scheme, the installation of the second vibration motor can transmit vibration to the screen plate through the transmission plate, so that the concrete waste on the screen plate can pass through the screen and enter the lower part of the machine body, while the non-magnetic metal can be retained on the screen plate, thereby achieving the purpose of separating concrete waste from non-magnetic metal.

[0014] Furthermore, a shovel and a contact element are fixedly connected to the inner wall of the machine body, both of which are in contact with the conveyor belt, and a collection frame is fixedly connected to the inner wall of the machine body.

[0015] The above solution allows the installation of a shovel plate to remove metal waste adsorbed on the flexible magnetic strip during the conveyor belt transport of concrete waste, enabling it to fall into the collection box for easy collection.

[0016] Furthermore, the inner wall of the machine body is rotatably connected to a transmission roller, and both transmission rollers are connected to the conveyor belt for transmission.

[0017] The above scheme allows the installation of two drive rollers to drive the conveyor belt to transport waste materials. During the transport process, the flexible magnetic strips on the conveyor belt can adsorb the metal waste in the waste materials, thereby separating the metal waste from the concrete waste.

[0018] Furthermore, two crushing rollers are rotatably connected to the inner wall of the machine body, and gear 1 is fixedly connected to the rear end of each of the two crushing rollers. The two gear 1s are meshed together. A rotating rod is rotatably connected to the inner wall of the machine body, and multiple levers are fixedly connected to the outer surface of the rotating rod.

[0019] The above scheme allows the installation of crushing rollers to crush concrete waste blocks entering the machine body, enabling the steel bars in the concrete waste to be separated from the concrete. Multiple paddles can turn the concrete waste over, preventing the concrete waste from accumulating with metal waste and affecting the adsorption of metal by the flexible magnetic strip.

[0020] Furthermore, the front end of the crushing roller on the left is fixedly connected to the output end of an external motor, and multiple discharge ports are opened on the outer surface of the machine body. Collection boxes are slidably connected to both the left and right sides of the machine body, and both collection boxes are located below the discharge ports that are close to them.

[0021] The above solution allows for the collection of discharged waste, facilitating its sorting and recycling.

[0022] Furthermore, the rear end of the right-side transmission roller and the right-side crushing roller are connected by a belt and a pulley. The rear end of the rotating rod is fixedly connected to a second gear, which meshes with a first gear that is close to it. A protective component is fixedly connected to the back of the machine body. A side inclined plate is fixedly connected to the inner wall of the machine body. A servo motor is installed on the front of the machine body, and the output end of the servo motor is fixedly connected to the front end of the grinding roller.

[0023] The above scheme allows concrete waste to be discharged into the upper part of the screen plate through the installation of the side inclined plate, and the waste on the screen plate can be screened by vibration. The protective parts can protect gear one and gear two, thereby improving the safety of the workers.

[0024] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0025] This waste treatment device for building construction projects combines a conveyor belt with flexible magnetic strips. The flexible magnetic strips, with their strong magnetism, effectively adsorb metal parts from the waste. Simultaneously, the addition of a vibrating motor ensures that the pulverized concrete is evenly spread on the conveyor belt. This not only promotes uniform concrete transport but also ensures that the metal waste is stably and tightly adsorbed onto the flexible magnetic strips, thus achieving complete separation of metal materials from concrete. Furthermore, the screening action of the sieve plate further separates non-magnetic metals such as copper from the concrete waste. This design not only improves the efficiency of waste treatment but also effectively recovers recyclable materials such as steel bars and copper, maximizing resource utilization.

[0026] Installing a sealing plate allows for the rapid sealing of the upper part of the machine after concrete waste is poured into it, effectively preventing dust generated during the crushing process and avoiding pollution to the surrounding working environment. At the same time, the grinding rollers and grinding frames inside the machine work together to finely grind the separated concrete particles, turning them back into small particles. This not only improves the recycling rate of waste but also optimizes the processing flow, making the treatment of concrete waste more efficient and environmentally friendly. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the overall structure of this application;

[0028] Figure 2 This is a schematic diagram of the gear structure of this application;

[0029] Figure 3 This is a schematic diagram of the overall structure of this application;

[0030] Figure 4 This is a schematic diagram of the conveyor belt structure in this application.

[0031] In the picture:

[0032] 1. Body; 2. Sorting components; 3. Grinding components;

[0033] 201. Flexible magnetic strip; 202. Screen plate; 203. Vibrating motor 1; 204. Support plate; 205. Conveyor belt;

[0034] 301. Rotating rod; 302. Grinding roller; 303. Grinding frame; 304. Sealing plate; 305. Spring;

[0035] 4. Water inlet pipe; 5. Valve; 6. Vibration motor II; 7. Transmission plate; 8. Shovel plate; 9. Contact element; 10. Collection frame; 11. Transmission roller; 12. Crushing roller; 13. Gear I; 14. Rotating rod; 15. Paddle plate; 16. Discharge port; 17. Collection box; 18. Gear II; 19. Protective component; 20. Side inclined plate; 21. Servo motor. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Please see Figure 1 , Figure 2 and Figure 3 The waste treatment device for building construction in this embodiment includes a body 1, which includes a sorting component 2 and a grinding component 3.

[0038] Please see Figure 1 , Figure 2 and Figure 4 The sorting component 2 includes a conveyor belt 205, with multiple flexible magnetic strips 201 fixedly connected to the outer surface of the conveyor belt 205. A sieve plate 202 is installed inside the machine body 1, and a vibration motor 203 is fixedly connected to the inner wall of the machine body 1. A bearing plate 204 is fixedly connected to the output end of the vibration motor 203, and the bearing plate 204 contacts the conveyor belt 205. Through the cooperation of the conveyor belt 205 and the flexible magnetic strips 201, the flexible magnetic strips 201, with their strong magnetism, can effectively adsorb metal parts in the waste. Simultaneously, the addition of the vibration motor 203 allows the pulverized concrete to be evenly spread on the conveyor belt 205, promoting not only the uniform transport of concrete but also ensuring that the metal waste can be stably and tightly adsorbed onto the flexible magnetic strips 201, thus achieving complete separation of metal materials from concrete materials. Through the screening action of the sieve plate 202, non-magnetic metals such as copper in the concrete waste can be further separated from the waste. This design not only improves the efficiency of waste treatment but also effectively recovers recyclable materials such as steel bars and copper, maximizing resource utilization.

[0039] Please see Figure 1 , Figure 2 and Figure 4The grinding assembly 3 includes a rotating rod 301, which is rotatably connected to the inner wall of the machine body 1. A grinding roller 302 is fixedly connected to the outer surface of the rotating rod 301. Two grinding frames 303 are fixedly connected to the inner wall of the machine body 1. Two sealing plates 304 are hinged to the upper end of the machine body 1. The two sealing plates 304 are in contact with each other. Springs 305 are fixedly connected to the bottom of each of the two sealing plates 304. Both springs 305 are fixedly connected to the inner wall of the machine body 1. Installing the sealing plates 304 can quickly seal the upper end of the machine body 1 after concrete waste is poured into it, effectively preventing dust generated during the crushing process of concrete waste and avoiding pollution to the surrounding working environment. At the same time, the grinding roller 302 and the grinding frames 303 equipped in the machine body 1 cooperate with each other to finely grind the separated concrete particles, turning them back into fine particles. This not only improves the recycling rate of waste but also optimizes the processing flow, making the treatment of concrete waste more efficient and environmentally friendly.

[0040] Please see Figure 1 , Figure 2 and Figure 3 Two grinding frames 303 are each fixedly connected to a water inlet pipe 4 on their opposite sides. Both water inlet pipes 4 completely penetrate the machine body 1. A valve 5 is installed at the end of each water inlet pipe 4 away from the machine body 1. The water inlet pipes 4 can inject cooling water into the grinding frames 303, thereby cooling the grinding rollers 302 and the grinding frames 303 to prevent them from overheating during grinding of concrete waste and affecting the service life of the grinding frames 303. A second vibration motor 6 is installed on the inner wall of the machine body 1. The output end of the second vibration motor 6 is hinged to a transmission plate 7. The other end of the transmission plate 7 is hinged to the bottom of the screen plate 202. The second vibration motor 6 can transmit vibration to the screen plate 202 through the transmission plate 7, so that the concrete waste on the screen plate 202 can pass through the screen and enter the lower part of the machine body 1, while non-magnetic metal can be retained on the screen plate 202, thus achieving the purpose of separating concrete waste from non-magnetic metal.

[0041] Please see Figure 1 , Figure 2 and Figure 3 The inner wall of the machine body 1 is fixedly connected with a shovel plate 8 and a contact element 9. Both the shovel plate 8 and the contact element 9 are in contact with the conveyor belt 205. The inner wall of the machine body 1 is fixedly connected with a collection frame 10. The shovel plate 8 can remove the metal waste adsorbed on the flexible magnetic strip 201 during the conveying of concrete waste by the conveyor belt 205, so that it can fall into the collection frame 10 for easy collection of metal waste. The inner wall of the machine body 1 is rotatably connected with a drive roller 11. Both drive rollers 11 are connected to the conveyor belt 205 for transmission. The installation of the two drive rollers 11 can drive the conveyor belt 205 to transport waste. During the transportation process, the flexible magnetic strip 201 on the conveyor belt 205 can adsorb the metal waste in the waste, thereby separating the metal waste from the concrete waste.

[0042] Please see Figure 1 , Figure 2 and Figure 3 Two crushing rollers 12 are rotatably connected to the inner wall of the machine body 1. Gears 13 are fixedly connected to the rear ends of the two crushing rollers 12, and the two gears 13 are meshed together. A rotating rod 14 is rotatably connected to the inner wall of the machine body 1. Multiple paddles 15 are fixedly connected to the outer surface of the rotating rod 14. The crushing rollers 12 can crush the concrete waste blocks that enter the machine body 1, so that the steel bars in the concrete waste can be separated from the concrete. The multiple paddles 15 can turn the concrete waste over, so as to prevent the concrete waste and metal waste from accumulating together and affecting the adsorption of metal by the flexible magnetic strip 201. The front end of the left crushing roller 12 is fixedly connected to the output end of an external motor. Multiple discharge ports 16 are opened on the outer surface of the machine body 1. Collection boxes 17 are slidably connected to both sides of the machine body 1. The two collection boxes 17 are located below the discharge ports 16 that are close to them. The collection frame 10 can collect the discharged waste, which is convenient for waste classification and recycling.

[0043] Please see Figure 1 , Figure 2 and Figure 3 The rear ends of the right-side drive roller 11 and the right-side crushing roller 12 are connected by a belt and a pulley. The rear end of the rotating rod 14 is fixedly connected to a gear 2 18, which meshes with the adjacent gear 1 13. A protective part 19 is fixedly connected to the back of the machine body 1. A side inclined plate 20 is fixedly connected to the inner wall of the machine body 1. A servo motor 21 is installed on the front of the machine body 1. The output end of the servo motor 21 is fixedly connected to the front end of the grinding roller 302. The installation of the side inclined plate 20 allows concrete waste to be discharged into the upper end of the screen plate 202, and the waste on the screen plate 202 can be screened by vibration. The protective part 19 can protect the gear 1 13 and gear 2 18, thereby improving the safety of the workers.

[0044] This embodiment of a waste treatment device for building construction projects utilizes a conveyor belt 205 and a flexible magnetic strip 201. The flexible magnetic strip 201, with its strong magnetism, effectively adsorbs metal components from the waste. Simultaneously, the addition of a vibrating motor 203 ensures that the pulverized concrete is evenly spread on the conveyor belt 205. This not only promotes the uniform transport of concrete but also ensures that the metal waste is stably and tightly adsorbed onto the flexible magnetic strip 201, thereby achieving complete separation of metal materials from concrete materials. Through the screening action of the sieve plate 202, non-magnetic metals such as copper in the concrete waste can be further separated from the waste. This design not only improves the efficiency of waste treatment but also effectively recovers recyclable materials such as steel bars and copper, maximizing resource utilization.

[0045] The installation of the sealing plate 304 can quickly seal the upper part of the machine body 1 after concrete waste is poured into it, effectively preventing dust generated during the crushing process and avoiding pollution to the surrounding working environment. At the same time, the grinding roller 302 and grinding frame 303 equipped inside the machine body 1 work together to finely grind the separated concrete particles, turning them back into fine particles. This not only improves the recycling rate of waste but also optimizes the processing flow, making the treatment of concrete waste more efficient and environmentally friendly.

[0046] The working principle of the above embodiment is as follows: First, when processing waste, the waste is fed into the machine body 1. When the waste is fed, the closing plate 304 swings under the action of gravity, opening the upper end of the machine body 1. After feeding, the closing plate 304 is reset under the push of the spring 305, closing the upper end of the machine body 1. This avoids dust pollution during the waste crushing process. Then, an external motor drives the left crushing roller 12 to rotate. Through the meshing of two gears 13, the two crushing rollers 12 can rotate in opposite directions, crushing the waste entering the machine body 1, separating the metal from the concrete waste. The separated waste can then fall into the machine body 1. The waste material falls onto the conveyor belt 205. As the right-side crushing roller 12 rotates, it drives the right-side transmission roller 11 to rotate via the belt. The right-side transmission roller 11, in turn, drives the conveyor belt 205 to transport the waste material above. At this time, the vibrating motor 203 starts and transmits vibration evenly to the conveyor belt 205 through the bearing plate 204, allowing the waste material on the conveyor belt 205 to be evenly spread out due to the vibration, so that the metal waste can be attracted to the flexible magnetic strip 201. As the left-side crushing roller 12 rotates, it drives the rotating rod 14 to rotate through the meshing of gear 13 and gear 2 18. This rotating rod 14 then drives multiple levers 15. The waste on the conveyor belt 205 is turned over to prevent it from piling up. As the conveyor belt 205 transports the waste, the metal adsorbed on the flexible magnetic strip 201 is scooped off by the shovel plate 8 into the collection frame 10 and enters the adjacent collection box 17. Non-magnetic metal and concrete waste can fall onto the screen plate 202. When the non-magnetic metal passes through the crushing roller 12, it is squeezed and deformed, making it into strips and retained on the screen plate 202. At this time, the vibrating motor 6 drives and transmits the vibration to the screen plate 202 through the transmission plate 7, so that the concrete waste on the screen plate 202 can be affected by the vibration and fall to the bottom of the machine body 1. The non-magnetic metal will be retained on the screen plate 202 and pass through the adjacent discharge port 1. The concrete waste is discharged into the collection box 17, while the concrete waste can enter the grinding frame 303. Then, the servo motor 21 drives the grinding roller 302 to rotate. Through the cooperation of the grinding roller 302 and the grinding frame 303, the concrete waste can be ground, so that the waste can be returned to granular form, which is convenient for recycling. During the grinding process, the grinding roller 302 and the grinding frame 303 are cooled by cooling water to prevent them from overheating and affecting the service life of the grinding frame 303. By separating the magnetic metals and non-magnetic metals in the waste and the concrete waste separately, the efficiency of waste treatment is improved, and recyclable materials such as steel bars and copper are effectively recovered, realizing the maximum utilization of resources.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste processing device for housing construction works, comprising a machine body (1), characterised in that: The machine body (1) comprises a classification assembly (2) and a grinding assembly (3); The classification assembly (2) comprises a conveying belt (205), the outer surface of the conveying belt (205) is fixedly connected with a plurality of flexible magnetic strips (201), the inside of the machine body (1) is provided with a sieve plate (202), the inner wall of the machine body (1) is fixedly connected with a vibration motor (203), the output end of the vibration motor (203) is fixedly connected with a bearing plate (204), the bearing plate (204) is in contact with the conveying belt (205). The grinding assembly (3) comprises a rotating rod (301), the rotating rod (301) is rotatably connected with the inner wall of the machine body (1), the outer surface of the rotating rod (301) is fixedly connected with a grinding roller (302), the inner wall of the machine body (1) is fixedly connected with two grinding frames (303), the upper end of the machine body (1) is hingedly connected with two sealing plates (304), the two sealing plates (304) are in contact, the bottom of each of the two sealing plates (304) is fixedly connected with a spring (305), and the two springs (305) are fixedly connected with the inner wall of the machine body (1).

2. A waste disposal device for use in house building operations according to claim 1, characterised in that: The side, away from each other, of the two grinding frames (303) is fixedly connected with a water inlet pipe (4), the two water inlet pipes (4) completely penetrate the machine body (1), and the end, away from the machine body (1), of the two water inlet pipes (4) is provided with a valve (5).

3. A waste disposal device for use in house building operations according to claim 1, characterised in that: The inner wall of the machine body (1) is provided with a vibration motor (6), the output end of the vibration motor (6) is hingedly connected with a transmission plate (7), and the other end of the transmission plate (7) is hingedly connected with the bottom of the sieve plate (202).

4. A construction waste processing device according to claim 1, characterized in that: The inner wall of the machine body (1) is fixedly connected with a shovel plate (8) and a contact piece (9), the shovel plate (8) and the contact piece (9) are in contact with the conveying belt (205), and the inner wall of the machine body (1) is fixedly connected with a collection frame (10).

5. A construction waste processing device for housing construction works as claimed in claim 1, wherein: The inner wall of the machine body (1) is rotatably connected with a transmission roller (11), and the two transmission rollers (11) are in transmission connection with the conveying belt (205).

6. A construction waste processing device for housing construction works as claimed in claim 1, wherein: The inner wall of the machine body (1) is rotatably connected with two crushing rollers (12), the rear end of each of the two crushing rollers (12) is fixedly connected with a gear (13), the two gears (13) are in meshing connection, the inner wall of the machine body (1) is rotatably connected with a rotating rod (14), and the outer surface of the rotating rod (14) is fixedly connected with a plurality of push plates (15).

7. A waste processing apparatus for use in house building projects according to claim 6, wherein: The front end of the left crushing roller (12) is fixedly connected with the output end of an external motor, a plurality of discharge ports (16) are formed in the outer surface of the machine body (1), and a collection box (17) is slidably connected to the left and right sides of the machine body (1), and the two collection boxes (17) are located below the discharge ports (16) close to the collection boxes (17).

8. A waste disposal device for use in house building operations according to claim 5, characterised in that: The rear end of the transmission roller (11) on the right side is connected with the rear end of the crushing roller (12) on the right side through a belt and a belt wheel, the rear end of the rotating rod (14) is fixedly connected with a gear two (18), the gear two (18) is meshingly connected with a gear one (13) adjacent to the gear two (18), the back of the machine body (1) is fixedly connected with a protection piece (19), the inner wall of the machine body (1) is fixedly connected with a side inclined plate (20), the front of the machine body (1) is provided with a servo motor (21), and the output end of the servo motor (21) is fixedly connected with the front end of the grinding roller (302).

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