Coal crushing and separating device

Abstract

The invention discloses a coal crushing and separating device, and relates to the technical field of coal crushing and separating, the coal crushing and separating device comprises a working box and a bottom box arranged at the lower end of the working box, the left side of the upper end of the working box is provided with a feeding port, a feeding inclined block is fixed in the feeding port, the working box is internally provided with a crushing and separating structure, and the front end of the bottom box is provided with a discharging port; a discharging inclined block is fixed in the discharging port, and a screening structure is arranged in the bottom box. The barrel is matched with the cleaning assembly and the blowing assembly, the cleaning assembly utilizes a rotating cleaning brush and bristles to be tightly attached to the outer wall of the barrel for cleaning, attached coal particles are effectively removed, cleanliness of the surface of the barrel is ensured, meanwhile, the blowing assembly conducts deep cleaning on separation sieve holes in the barrel through high-pressure gas, blockage is prevented, and the separation efficiency is improved. And the cleaning efficiency is improved, so that the cleanness of the surface of the barrel and the smoothness of the separation sieve holes are ensured, the crushing and separating effects of coal are optimized, and the maintenance difficulty and cost of the device are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coal crushing and separation, in particular to a coal crushing and separation device. Background Art

[0002] In the process of coal mining, coal crushing is an essential operation link. Raw coal or bituminous coal can only be transported to the next link for processing and treatment after being crushed. The effect of material crushing directly depends on the performance of the crushing device. The commonly used crushing devices have poor crushing effect on coal, which easily causes uneven coal particle size, is not conducive to uninterrupted crushing, and increases time cost. At the same time, the size of the coal after crushing is uneven, and the existing coal crushing device cannot effectively sort out the coal, thereby reducing the utilization rate of coal.

[0003] Moreover, after being crushed, coal tends to adhere to the inner wall and screen of the device, especially the clogging problem on the screen is particularly serious, which not only affects the separation effect of the coal, but also increases the maintenance difficulty and cost of the device.

[0004] Based on this, a coal crushing and separation device is now provided, which can eliminate the disadvantages of the existing devices. Summary of the invention

[0005] The object of the present invention is to provide a coal crushing and separation device to solve the problem of coal particles blocking the screen in the background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A coal crushing and separation device, comprising a working box and a bottom box arranged at the lower end of the working box, a feed port is provided at the left side of the upper end of the working box, a feed inclined block is fixed inside the feed port, a crushing and separation structure is arranged inside the working box, a discharge port is provided at the front end of the bottom box, a discharge inclined block is fixed inside the discharge port, and a screening structure is arranged inside the bottom box;

[0008] The screening structure includes a plurality of screening elements arranged inside the bottom box and a second motor installed at the rear end of the bottom box. Every two adjacent screening elements are connected by a three-phase transmission belt. A second driving wheel is fixed to the output end of the second motor, and the second driving wheel is connected to a screening element through a second transmission belt.

[0009] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0010] Preferably, the crushing and separation structure includes a motor 1 installed at the right end of the outer wall of the working box, the output end of the motor 1 extends to the inside of the working box and is fixedly connected to the main gear, the main gear is meshed and connected to two gears 1 and one gear 2, the two gears 1 are symmetrically distributed on both sides of the lower end of the main gear, the gear 1 is connected to the cleaning component, the gear 2 is located at the upper end of the main gear, the gear 2 is connected to the blowing component, the gear 2 is meshed and connected to the two gears 1 with an inner gear ring, a cylinder is fixed on the end of the inner gear ring away from the main gear, a plurality of separation sieve holes are opened through the outer wall of the cylinder, a crushing component is arranged inside the cylinder, and the crushing component is connected to the main gear.

[0011] Preferably, the crushing assembly includes a connecting rod rotatably installed inside the cylinder, the connecting rod is fixed to the main gear, an installation cavity is opened inside the connecting rod, a fixing rod is fixed inside the installation cavity, a plurality of bevel gears 1 and 2 are equidistantly fixed on the fixing rod, the bevel gear 1 and the bevel gear 2 are arranged opposite to each other, the bevel gear 1 and the bevel gear 2 are meshed and connected with bevel gear 3, the bevel gear 3 is fixedly connected to a crushing rod, the crushing rod rotates with the connecting rod, the other end of the crushing rod is rotatably connected to a scraper, the scraper is in contact with the inner wall of the cylinder, and the crushing rod is provided with a plurality of evenly arranged crushing reamers.

[0012] Preferably, the cleaning assembly includes a driving wheel rotatably mounted on the right end of the outer wall of the working box, the driving wheel is fixed to a gear, the driving wheel is connected to a driven wheel through a transmission belt, a cleaning rod is fixed to one end of the driven wheel, the cleaning rod extends to the interior of the working box, a cleaning brush is fixed to the outer wall of the cleaning rod, a plurality of bristles are provided on the cleaning brush, and the cleaning brush is in contact with the outer wall of the cylinder.

[0013] Preferably, the blowing assembly includes a rotating shaft fixed at the center position of gear 2, one end of the rotating shaft extends to the outer wall of the working box and is fixedly connected to a rotating plate, the other end of the rotating plate is rotatably connected to a linkage plate through a fixed shaft, a movable plate is fixed at one end of the linkage plate, guide openings are symmetrically penetrated on both sides of the upper end of the movable plate, a guide block matching the guide opening is fixed at the upper end of the working box, a top opening is penetrated at the upper end of the working box, an air plate matching the top opening is installed at the lower end of the movable plate, a plurality of air jets are opened at the lower end of the air plate, and the air plate is connected to the air compressor through an air pipe.

[0014] Preferably, the screening component includes a screening rod rotatably installed inside the bottom box, a plurality of screening grooves are equidistantly provided on the outer wall of the screening rod, one end of the screening rod is fixedly connected to the rotating wheel 2 through a rotating rod, the rotating wheel 2 is fixed to the rotating wheel 1, and every two adjacent rotating wheels 1 or 2 are connected through a transmission belt 3.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention cooperates with the cylinder and the crushing assembly. The motor drives the main gear to rotate, which drives the connecting rod, the fixed rod and the bevel gear thereon to rotate. The bevel gears mesh to drive the crushing rod and the crushing reamer to rotate and crush the coal. The scraper scrapes off the attached coal. At the same time, the main gear drives the cylinder to rotate through the gear transmission to separate and screen the coal particles, thereby ensuring the crushing and separation effect of the coal and reducing the maintenance difficulty and cost of the device.

[0017] 2. The present invention cooperates with the cylinder with the cleaning component and the blowing component. The cleaning component uses a rotating cleaning brush and bristles to closely fit the outer wall of the cylinder for cleaning, effectively removes attached coal particles, and ensures the cleanliness of the cylinder surface. At the same time, the blowing component uses high-pressure gas to deeply clean the separation sieve holes on the cylinder to prevent blockage and improve the cleaning efficiency, thereby ensuring the cleanliness of the cylinder surface and the smooth flow of the separation sieve holes, optimizing the crushing and separation effects of the coal, and reducing the maintenance difficulty and cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of one side of the interior of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the other side inside the present invention.

[0021] Figure 4 It is a structural schematic diagram of the crushing and separation structure of the present invention.

[0022] Figure 5 It is a schematic structural diagram of the blowing assembly of the present invention.

[0023] Figure 6 It is a schematic structural diagram of the crushing assembly of the present invention.

[0024] Notes on the reference numerals: 1. working box; 11. feeding port; 12. feeding inclined block; 13. guide block; 14. top port; 2. bottom box; 21. discharging port; 22. discharging inclined block; 3. crushing and separation structure; 301. motor 1; 302. main gear; 303. gear 1; 304. gear 2; 305. inner gear ring; 306. cylinder; 307. separation sieve hole; 31. crushing assembly; 311. connecting rod; 312. mounting cavity; 313. fixing rod; 314. bevel gear 1; 315. bevel gear 2; 316. bevel gear 3; 317. crushing rod; 318. crushing reamer; 319. scraper; 32. cleaning assembly ; 321, driving wheel one; 322, transmission belt one; 323, driven wheel one; 324, cleaning rod; 325, cleaning brush; 326, bristles; 33, blowing assembly; 331, rotating shaft; 332, rotating plate; 333, fixed shaft; 334, linkage plate; 335, movable plate; 336, guide port; 337, air plate; 338, air jet; 339, air pipe; 4, screening structure; 401, motor two; 402, driving wheel two; 403, transmission belt two; 404, transmission belt three; 41, screening element; 411, rotating wheel one; 412, rotating wheel two; 413, rotating rod; 414, screening rod; 415, screening slot. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] In one embodiment, Figure 1-Figure 6 As shown, a coal crushing and separation device comprises a working box 1 and a bottom box 2 arranged at the lower end of the working box 1, a feed port 11 is opened at the left side of the upper end of the working box 1, a feed inclined block 12 is fixed inside the feed port 11, a crushing and separation structure 3 is arranged inside the working box 1, a discharge port 21 is opened at the front end of the bottom box 2, a discharge inclined block 22 is fixed inside the discharge port 21, and a screening structure 4 is arranged inside the bottom box 2;

[0027] The screening structure 4 includes a plurality of screening elements 41 arranged inside the bottom box 2 and a second motor 401 installed at the rear end of the bottom box 2. Every two adjacent screening elements 41 are connected by a third transmission belt 404. A second driving wheel 402 is fixed to the output end of the second motor 401. The second driving wheel 402 is connected to a screening element 41 through a second transmission belt 403.

[0028] In this embodiment, the coal enters the crushing and separation structure 3 inside the working box 1 through the feed bevel 12 of the feed port 11, the coal is crushed and separated into coal particles by the crushing and separation structure 3, and the separated coal enters the bottom box 2, the motor 2 401 drives the driving wheel 2 402 to rotate, the driving wheel 2 402 drives the screening element 41 to rotate through the transmission belt 2 403, and every two adjacent screening elements 41 are transmitted by the transmission belt 3 404, the coal is screened and separated by the screening element 41 of the screening structure 4, the smaller coal particles fall to the bottom of the working box 1 through the screening element 41, and the larger coal particles are discharged through the discharge bevel 22 of the discharge port 21.

[0029] In an optional embodiment, the crushing and separation structure 3 includes a motor 301 installed on the right end of the outer wall of the working box 1, the output end of the motor 301 extends to the inside of the working box 1 and is fixedly connected to the main gear 302, the main gear 302 is meshed with two gears 1 303 and a gear 2 304, the two gears 1 303 are symmetrically distributed on both sides of the lower end of the main gear 302, the gear 1 303 is connected to the cleaning component 32, the gear 2 304 is located at the upper end of the main gear 302, the gear 2 304 is connected to the blowing component 33, the gear 2 304 is meshed with the two gears 1 303 and connected to the inner gear ring 305, the end of the inner gear ring 305 away from the main gear 302 is fixed with a cylinder 306, the outer wall of the cylinder 306 is penetrated with a plurality of separation sieve holes 307, a crushing component 31 is arranged inside the cylinder 306, and the crushing component 31 is connected to the main gear 302.

[0030] It should be noted that when the motor 1 301 is started, the main gear 302 starts to rotate, which in turn drives the gear 1 303 and the gear 2 304 to rotate. The rotation of the gear 1 303 and the gear 2 304 drives the inner gear ring 305 to rotate, thereby driving the cylinder 306 to rotate. The main gear 302 enables the internal crushing assembly 31 to start working and crush the coal into smaller particles. The rotation of the cylinder 306 separates and screens the coal particles.

[0031] In an optional embodiment, the crushing assembly 31 includes a connecting rod 311 rotatably installed inside the cylinder 306, the connecting rod 311 is fixed to the main gear 302, an installation cavity 312 is opened inside the connecting rod 311, a fixing rod 313 is fixed inside the installation cavity 312, a plurality of bevel gears 1 314 and bevel gears 2 315 are equidistantly fixed on the fixing rod 313, the bevel gears 1 314 and bevel gears 2 315 are arranged opposite to each other, the bevel gears 1 314 and bevel gears 2 315 are meshed and connected with bevel gears 316, the bevel gears 316 are fixedly connected to a crushing rod 317, the crushing rod 317 rotates with the connecting rod 311, the other end of the crushing rod 317 is rotatably connected to a scraper 319, the scraper 319 is in contact with the inner wall of the cylinder 306, and the crushing rod 317 is provided with a plurality of evenly arranged crushing reamers 318.

[0032] It should be noted that when the main gear 302 rotates, the connecting rod 311 will also rotate. The rotation of the connecting rod 311 will drive the fixed rod 313 and the bevel gear 1 314 and bevel gear 2 315 thereon to rotate. The rotation of the bevel gear 1 314 and bevel gear 2 315 will mesh with the bevel gear 3 316 in turn, thereby driving the crushing rod 317 and the crushing reamer 318 thereon to rotate. The rotation of the crushing reamer 318 will crush the coal, and at the same time, the scraper 319 will move along the inner wall of the cylinder 306 to scrape off the attached coal particles. Such a design enables the crushing assembly 31 to crush the coal efficiently and prevent the accumulation of coal particles on the inner wall of the cylinder 306, thereby improving the crushing efficiency and separation effect.

[0033] In an optional embodiment, the cleaning assembly 32 includes a driving wheel 321 rotatably mounted on the right end of the outer wall of the working box 1, the driving wheel 321 is fixed to the gear 303, the driving wheel 321 is connected to the driven wheel 323 through a transmission belt 322, a cleaning rod 324 is fixed to one end of the driven wheel 323, the cleaning rod 324 extends to the interior of the working box 1, a cleaning brush 325 is fixed to the outer wall of the cleaning rod 324, a plurality of bristles 326 are arranged on the cleaning brush 325, and the cleaning brush 325 is in contact with the outer wall of the cylinder 306.

[0034] It should be noted that when the main gear 302 rotates, it will drive the gear 1 303 to rotate, and the rotation of the gear 1 303 will drive the driving wheel 1 321 to rotate, and the driving wheel 1 321 will transmit the rotational power to the driven wheel 1 323 through the transmission belt 1 322, and the rotation of the driven wheel 1 323 will drive the cleaning rod 324 and the cleaning brush 325 thereon to rotate, and the rotation of the cleaning brush 325 will use the bristles 326 to clean the outer wall of the cylinder 306 to remove the coal particles or other impurities attached thereto. Such a design enables the cleaning component 32 to automatically and efficiently clean the outer wall of the cylinder 306, preventing the coal particles from accumulating and affecting the crushing and separation effects, and at the same time, it also reduces the need for manual cleaning, and improves the automation and operation efficiency of the equipment.

[0035] In an optional embodiment, the blowing assembly 33 includes a rotating shaft 331 fixed at the center position of gear 2 304, one end of the rotating shaft 331 extends to the outer wall of the working box 1 and is fixedly connected to a rotating plate 332, the other end of the rotating plate 332 is rotatably connected to a linkage plate 334 through a fixed shaft 333, a movable plate 335 is fixed at one end of the linkage plate 334, guide openings 336 are symmetrically penetrated on both sides of the upper end of the movable plate 335, a guide block 13 matching the guide opening 336 is fixed at the upper end of the working box 1, a top opening 14 is penetrated at the upper end of the working box 1, an air plate 337 matching the top opening 14 is installed at the lower end of the movable plate 335, a plurality of air jets 338 are opened at the lower end of the air plate 337, and the air plate 337 is connected to the air compressor through an air pipe 339.

[0036] It should be noted that when the main gear 302 rotates, it will drive the second gear 304 to rotate, and the rotation of the second gear 304 will drive the rotating shaft 331 and the rotating plate 332 to rotate. The rotation of the rotating plate 332 will drive the linkage plate 334 to swing back and forth through the fixed shaft 333. The reciprocating swing of the linkage plate 334 will drive the movable plate 335 to move up and down. The up and down movement of the movable plate 335 will drive the gas plate 337 to move up and down at the top opening 14. When the gas plate 337 moves up and down, the high-pressure gas provided by the air compressor to the gas plate 337 through the air pipe 339 will be ejected through the jet port 338 to form a blowing effect. The distance between the jet port 338 and the cylinder 306 is adjusted by the up and down reciprocating movement of the gas plate 337, so as to control the impact force of the high-pressure gas on the cylinder 306, so as to effectively clean the coal particles attached to the inside of the several separation sieve holes 307 on the cylinder 306 and prevent the occurrence of blockage.

[0037] In an optional embodiment, the screening element 41 includes a screening rod 414 rotatably installed inside the bottom box 2, and a plurality of screening grooves 415 are equidistantly provided on the outer wall of the screening rod 414. One end of the screening rod 414 is fixedly connected to the second wheel 412 through a rotating rod 413. The second wheel 412 is fixed to the first wheel 411, and every two adjacent wheels 1 411 or 2 412 are connected through a transmission belt 3 404.

[0038] It should be noted that the second motor 401 is started to drive the second driving wheel 402 to rotate. The second driving wheel 402 drives a screening element 41 (specifically, a rotating wheel on the screening element 41) to rotate through the second transmission belt 403. The rotating screening element 41 transmits the rotational power to the adjacent screening element 41 through the third transmission belt 404, so as to realize the synchronous rotation of the entire screening structure 4. The coal particles fall from the crushing and separation structure 3 into the screening structure 4. As the screening rod 414 rotates, the particles roll along the screening slot 415 and are screened and separated.

[0039] The above embodiment discloses a coal crushing and separation device, wherein the coal enters the crushing and separation structure 3 inside the working box 1 through the feed inclined block 12 of the feed port 11, and the coal is crushed and separated into coal particles by the crushing and separation structure 3.

[0040] Specifically, the motor 301 drives the main gear 302 to rotate, and the main gear 302 drives the gear 1 303 and the gear 2 304 to rotate, thereby driving the inner gear ring 305 to rotate, and the cylinder 306 rotates accordingly; at the same time, the gear 1 303 drives the bristles 326 to rotate through the driving wheel 1 321, the transmission belt 1 322, the driven wheel 1 323, and the cleaning rod 324, and the bristles 326 clean the outer wall of the cylinder 306, and a plurality of cleaning brushes 325 on the bristles 326 clean the cylinder 306. The coal particles inside the upper and lower separation sieve holes 307 are cleaned; at the same time, the gear 2 304 drives the movable plate 335 to move up and down along the guide block 13 through the rotating shaft 331, the rotating plate 332, the fixed shaft 333, and the linkage plate 334, and the air compressor provides high-pressure gas to the air pipe 339. The high-pressure gas is blown out from the jet port 338, and the coal particles attached to the separation sieve holes 307 are blown into the cylinder 306, so as to avoid the blockage of the separation sieve holes 307 and improve the separation and screening efficiency.

[0041] The separated coal enters the bottom box 2, and the motor 2 401 drives the driving wheel 2 402 to rotate. The driving wheel 2 402 drives the screening element 41 to rotate through the transmission belt 2 403. Every two adjacent screening elements 41 are transmitted by the transmission belt 3 404. The coal is screened and separated by the screening element 41 of the screening structure 4. The smaller coal particles fall to the bottom of the working box 1 through the screening groove 415 of the screening element 41, and the larger coal particles are discharged through the discharge inclined block 22 of the discharge port 21.

[0042] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A coal crushing and separation device, characterized in that: The invention comprises a working box (1) and a bottom box (2) arranged at the lower end of the working box (1); a feed port (11) is provided on the left side of the upper end of the working box (1); a feed inclined block (12) is fixed inside the feed port (11); a crushing and separation structure (3) is arranged inside the working box (1); a discharge port (21) is provided at the front end of the bottom box (2); a discharge inclined block (22) is fixed inside the discharge port (21); and a screening structure (4) is arranged inside the bottom box (2); The screening structure (4) comprises a plurality of screening elements (41) arranged inside the bottom box (2) and a second motor (401) installed at the rear end of the bottom box (2), wherein every two adjacent screening elements (41) are connected via a third transmission belt (404), and a second driving wheel (402) is fixed to the output end of the second motor (401), and the second driving wheel (402) is connected to a screening element (41) via a second transmission belt (403).

2. A coal crushing and separation device according to claim 1, characterized in that: The crushing and separation structure (3) comprises a motor 1 (301) mounted on the right end of the outer wall of the working box (1); the output end of the motor 1 (301) extends into the working box (1) and is fixedly connected to a main gear (302); the main gear (302) is meshed with two gears 1 (303) and a gear 2 (304); the two gears 1 (303) are symmetrically distributed on both sides of the lower end of the main gear (302); the gear 1 (303) is connected to a cleaning assembly (32); the gear 2 (304) is located at the main gear (302). At the upper end of the gear (302), the gear 2 (304) is connected to the blowing assembly (33), the gear 2 (304) is meshed with the two gear 1s (303) to be connected to an inner gear ring (305), a cylinder (306) is fixed to one end of the inner gear ring (305) away from the main gear (302), a plurality of separation sieve holes (307) are penetrated through the outer wall of the cylinder (306), a crushing assembly (31) is arranged inside the cylinder (306), and the crushing assembly (31) is connected to the main gear (302).

3. A coal crushing and separation device according to claim 2, characterized in that: The crushing assembly (31) comprises a connecting rod (311) rotatably mounted inside the cylinder (306), the connecting rod (311) being fixed to the main gear (302), a mounting cavity (312) being provided inside the connecting rod (311), a fixing rod (313) being fixed inside the mounting cavity (312), a plurality of bevel gears (314) and (315) being fixed at equal distances on the fixing rod (313), the bevel gears (314) and (315) being rotatably mounted inside the cylinder (306), the bevel gears (314) and (315) being fixed to each other. In the arrangement, the bevel gear 1 (314) and the bevel gear 2 (315) are meshedly connected with the bevel gear 3 (316), the bevel gear 3 (316) is fixedly connected with the crushing rod (317), the crushing rod (317) rotates with the connecting rod (311), the other end of the crushing rod (317) is rotatably connected with the scraper (319), the scraper (319) is in contact with the inner wall of the cylinder (306), and the crushing rod (317) is provided with a plurality of evenly arranged crushing reamers (318).

4. A coal crushing and separation device according to claim 2, characterized in that: The cleaning assembly (32) comprises a driving wheel (321) rotatably mounted on the right end of the outer wall of the working box (1); the driving wheel (321) is fixed to a gear (303); the driving wheel (321) is transmission-connected to a driven wheel (323) via a transmission belt (322); a cleaning rod (324) is fixed to one end of the driven wheel (323); the cleaning rod (324) extends into the interior of the working box (1); a cleaning brush (325) is fixed to the outer wall of the cleaning rod (324); a plurality of bristles (326) are arranged on the cleaning brush (325); and the cleaning brush (325) is in contact with the outer wall of the cylinder (306).

5. The coal crushing and separation device according to claim 2, characterized in that: The blowing assembly (33) comprises a rotating shaft (331) fixed at the center position of the second gear (304), one end of the rotating shaft (331) extends to the outer wall of the working box (1) and is fixedly connected to a rotating plate (332), the other end of the rotating plate (332) is rotatably connected to a linkage plate (334) via a fixed shaft (333), one end of the linkage plate (334) is fixed with a movable plate (335), and both sides of the upper end of the movable plate (335) are symmetrically penetrated by openings A guide port (336) is provided, a guide block (13) matching the guide port (336) is fixed at the upper end of the working box (1), a top port (14) is opened through the upper end of the working box (1), an air plate (337) matching the top port (14) is installed at the lower end of the movable plate (335), a plurality of air jet ports (338) are opened at the lower end of the air plate (337), and the air plate (337) is connected to the air compressor through an air pipe (339).

6. The coal crushing and separation device according to claim 1, characterized in that: The screening element (41) comprises a screening rod (414) rotatably mounted inside the bottom box (2); a plurality of screening grooves (415) are equidistantly provided on the outer wall of the screening rod (414); one end of the screening rod (414) is fixedly connected to a second rotating wheel (412) via a rotating rod (413); the second rotating wheel (412) is fixed to a first rotating wheel (411); and every two adjacent first rotating wheels (411) or second rotating wheels (412) are connected in transmission via a third transmission belt (404).

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