Building waste solid waste recycling and crushing device

Abstract

The utility model discloses a building waste solid waste recycling and crushing device which comprises a machine frame, a crushing box body is arranged on the machine frame, and a squeezing and crushing mechanism, an iron material screening mechanism, a plastic bag collecting mechanism, a mincing mechanism, a screen and a recycled aggregate conveying mechanism are arranged in the crushing box body from top to bottom. The crushing mechanism comprises a rear plate, a driving motor, a fixed seat, a fixed tooth block, a rotating seat and a rotating tooth block, the driving motor is provided with a driving gear in a driving mode, a rotating shaft I is arranged on the rear plate, a driven gear is arranged on the rotating shaft I, and a tooth-shaped transmission belt is arranged between the driven gear and the driving gear. A winding roller motor is arranged outside the crushing box body, a winding roller rod is arranged on the winding roller motor in a driving manner, and a ram is arranged on the winding roller rod. The device has the characteristics that iron materials such as steel bars, iron nails and the like are sieved and recycled, plastic bags are sieved, and the compaction degree and the crushing effect of recycled concrete formed by reusing recycled aggregate are better.

Description

Technical Field

[0001] The utility model relates to the technical field of construction waste recycling, in particular to a construction waste solid waste recycling and crushing device. Background Art

[0002] Construction waste refers to the slag, abandoned soil, abandoned materials, silt and other wastes generated during the construction, laying, demolition and repair of various buildings, structures, pipe networks, etc. by construction units or individuals. With the acceleration of industrialization and urbanization, the construction industry has also developed rapidly, and the construction waste generated has increased day by day. At present, the amount of construction waste in my country has accounted for more than / of the total amount of urban waste. In order to make effective use of buildings, construction waste crushers are generally used to crush and process construction waste, so that it can be turned into aggregates that can be reused.

[0003] Since construction waste is mixed with iron materials such as steel bars and nails, the current construction waste crushing device only has the function of crushing, but does not have the function of screening iron materials. In addition, the conventional construction waste crushing device adopts a hammer structure. During the crushing process, the steel bars are easy to cause jamming during crushing, which leads to shutdown or failure. Secondly, there are also some plastic bags mixed in the construction waste, which are difficult to remove manually, so plastic bags are often crushed together. The presence of plastic after crushing will reduce the density of recycled concrete formed by the reuse of recycled aggregates after crushing, so it is necessary to improve it. Utility Model Content

[0004] In order to solve the problems raised in the above background technology, the utility model provides a construction waste solid waste recycling and crushing device, which has the characteristics of screening and recycling iron materials such as steel bars and nails, screening plastic bags, ensuring the density of recycled concrete formed by repeated use of recycled aggregates and better crushing effect.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a construction waste solid waste recycling and crushing device, comprising a frame, a crushing box is arranged on the frame, and a crushing mechanism, an iron material screening mechanism, a plastic bag collecting mechanism, a shredding mechanism, a screen and a recycled aggregate conveying mechanism are arranged from top to bottom in the crushing box, the crushing mechanism comprises a rear plate, a driving motor, a fixed seat, a fixed tooth block, a rotating seat and a rotating tooth block, the driving motor is fixed on the rear plate, the driving motor is driven by a driving gear, a rotating shaft I for rotating the rotating seat is arranged on the rear plate, a driven gear is arranged on the rotating shaft I, a toothed transmission belt is arranged between the driven gear and the driving gear, the fixed seat is installed on the rear plate, the fixed tooth block is installed on the fixed seat, and the The rotating tooth block is installed on the rotating seat. The iron material screening mechanism includes a base plate, an electromagnetic plate and a vibrator I. The electromagnetic plate is hingedly arranged on the inner wall of the crushing box. A fixed tube is arranged at the bottom of the base plate. A telescopic rod is inserted in the fixed tube. A reset spring is arranged on the outer sleeve of the telescopic rod. The end of the telescopic rod is fixedly installed with the electromagnetic plate. The vibrator I is located at the bottom of the electromagnetic plate. A roller motor is arranged outside the crushing box. The roller motor drives a roller rod, and a picking rod is arranged on the roller rod. The crushing mechanism includes a driving unit and a capstan. The driving unit drives a capstan shaft. The capstans are arranged on the capstan shaft at intervals. The capstans are arranged to be interlaced with each other. The crushing box is provided with convex ridges inserted between the capstans. The bottom of the screen is provided with a vibrator II.

[0006] As a preferred embodiment of the utility model, the crushing box is provided with a material guide plate and a material discharge guide slope.

[0007] As a preferred embodiment of the utility model, a telescopic support plate is provided on the crushing box, a limiting portion is provided on the telescopic support plate, a locking bolt button for locking the telescopic support plate is provided on the front of the crushing box, a screening outlet is provided on the side of the crushing box, and a blocking piece is provided on the screening outlet.

[0008] As a preferred embodiment of the utility model, the recycled aggregate conveying mechanism includes a conveying frame, a conveying belt and a conveying motor, a supporting foot is provided at the bottom of the conveying frame, the conveying motor is arranged on the conveying frame, a driving chain gear is provided for driving the conveying motor, a left rotating frame and a right rotating frame are rotatably provided on the conveying frame, the conveying belt is arranged on the outer rings of the left rotating frame and the right rotating frame, a central shaft is provided on the right rotating frame, a driven chain gear is provided on the central shaft, and a transmission chain is provided between the driving chain gear and the driven chain gear.

[0009] As a preferred embodiment of the utility model, an auxiliary shaft is provided on the rear plate, an auxiliary rotating member is rotatably provided on the auxiliary shaft, and a rotating shaft II is installed between the auxiliary rotating member and the rotating seat.

[0010] As a preferred embodiment of the present invention, the electromagnetic plate is arranged to be inclined on one side.

[0011] As a preferred embodiment of the utility model, the driving unit includes a mincing drive motor and a transmission gear box, the mincing drive motor is driven by a driving pulley, the capstan shaft is provided with gears I and II that mesh with each other for transmission, the gear I is provided with a gear rod I, the gear rod I is provided with a gear III, the gear III is meshed with a gear IV, the gear III and the gear IV are located in the transmission gear box, the gear IV is provided with a gear rod II, the gear rod II is provided with a driven pulley, and a transmission belt is provided between the driving pulley and the driven pulley.

[0012] By adopting the above technical solution, the utility model has the following advantages compared with the prior art:

[0013] The utility model has a simple and reasonable structure. When it is used, it first performs preliminary extrusion and crushing through the extrusion and crushing mechanism, drives the active gear to rotate through the driving motor, and drives the driven gear to rotate through the toothed transmission belt, so that the rotating tooth block on the rotating seat rotates and cooperates with the fixed tooth block on the opposite side to achieve the rotational extrusion effect. The driving motor adopts a forward and reverse motor to perform forward and reverse reciprocating movements. The rotational extrusion range is set by adjusting the forward and reverse motor stroke according to actual needs. This structure can effectively extrude and crush the construction waste and solid waste, and will not cause equipment jamming during relative extrusion, so that iron materials such as steel bars and nails are separated, thereby ensuring the normal operation of the equipment. The extruded and crushed construction waste and solid waste will reach the electromagnetic plate, which will absorb the iron material when it is running, and the reset spring has a reaction force. When the vibrator When the electromagnetic plate vibrates, since the telescopic rod can be extended and retracted in the fixed tube, the reset spring will generate a back and forth reaction force to improve the vibration effect of the electromagnetic plate, and the vibration characteristics are used to guide the construction waste solid waste without iron materials on the electromagnetic plate into the subsequent crushing mechanism. In this process, the roller motor drives the roller rod to rotate the lifting rod. The rotation of the lifting rod will entangle the plastic bag, thereby achieving plastic bag screening, thereby ensuring the density of recycled aggregates to be reused to form recycled concrete; through the crushing mechanism, the drive unit drives a capstan shaft to drive the capstan to rotate. The capstans rotate and intersect with each other, and cooperate with the convex ridges to crush the construction waste solid waste well. Finally, the screen is vibrated and screened to achieve the required particle size. The whole process has a good crushing effect and achieves resource recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the utility model when the telescopic support plate is extended inwardly and the screening outlet is opened;

[0017] Figure 3 This is a schematic diagram of the structure of the crushing mechanism of the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the mincing mechanism of the utility model;

[0019] Figure 5 This is a schematic diagram of the internal structure of the transmission gearbox of the utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the recycled aggregate conveying mechanism of the utility model;

[0021] Figure 7 This is a schematic diagram of the recycled aggregate conveying mechanism of the utility model after the conveyor belt is disassembled;

[0022] In the figure: 1, frame; 2, crushing box; 3, screen; 4, back plate; 5, driving motor; 6, fixed seat; 7, fixed tooth block; 8, rotating seat; 9, rotating tooth block; 10, driving gear; 11, rotating shaft I; 12, driven gear; 13, toothed transmission belt; 14, base plate; 15, electromagnetic plate; 16, vibrator I; 17, fixed pipe; 18, telescopic rod; 19, reset spring; 20, roller motor; 21, roller rod; 22, lifting rod; 23, capstan; 24, capstan shaft; 25, convex ridge; 26, vibrator II; 27, guide plate; 28, discharge guide slope; 29, telescopic support plate; 30, limit part ; 31. Locking bolt button; 32. Screening outlet; 33. Blocking piece; 34. Conveying frame; 35. Conveying belt; 36. Conveying motor; 37. Supporting foot; 38. Driving chain gear; 39. Left rotating frame; 40. Right rotating frame; 41. Center axis; 42. Driven chain gear; 43. Auxiliary shaft rod; 44. Auxiliary rotating member; 45. Rotating shaft II; 46. Crushing drive motor; 47. Transmission gear box; 48. Driving pulley; 49. Gear I; 50. Gear II; 51. Gear rod I; 52. Gear III; 53. Gear IV; 54. Gear rod II; 55. Driven pulley; 56. Transmission belt. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example

[0025] See also Figure 1-7 The utility model provides a technical solution: a construction waste solid waste recycling and crushing device, including a frame 1, a crushing box 2 is arranged on the frame 1, and a crushing mechanism, an iron material screening mechanism, a plastic bag collecting mechanism, a shredding mechanism, a screen 3 and a recycled aggregate conveying mechanism are arranged from top to bottom in the crushing box 2, and the crushing mechanism includes a rear plate 4, a driving motor 5, a fixed seat 6, a fixed tooth block 7, a rotating seat 8 and a rotating tooth block 9, the driving motor 5 is fixed on the rear plate 4, and the driving motor 5 drives a driving gear 10, and a rotating shaft I11 for rotating the rotating seat 8 is arranged on the rear plate 4, and a driven gear 12 is arranged on the rotating shaft I11, and a toothed transmission belt 13 is arranged between the driven gear 12 and the driving gear 10, the fixed seat 6 is installed on the rear plate 4, the fixed tooth block 7 is installed on the fixed seat 6, and the rotating tooth block 9 is installed on the rotating seat 8 The iron material screening mechanism includes a base plate 14, an electromagnetic plate 15 and a vibrator I16. The electromagnetic plate 15 is hinged on the inner wall of the crushing box 2. A fixed tube 17 is provided at the bottom of the base plate 14. A telescopic rod 18 is inserted in the fixed tube 17. A return spring 19 is provided on the outer sleeve of the telescopic rod 18. The end of the telescopic rod 18 is fixedly installed with the electromagnetic plate 15. The vibrator I16 is located at the bottom of the electromagnetic plate 15. A roller motor 20 is provided outside the crushing box 2. The roller motor 20 drives a roller rod 21. A lifting rod 22 is provided on the roller rod 21. The crushing mechanism includes a driving unit and a capstan 23. The driving unit drives a capstan shaft 24. The capstans 23 are arranged on the capstan shaft 24 at intervals. The capstans 23 are arranged to be interlaced with each other. The crushing box 2 is provided with convex ridges 25 inserted between the capstans 23. The bottom of the screen 3 is provided with a vibrator II26.

[0026] In the present embodiment, the utility model has a simple and reasonable structure. When it is used, the crushing mechanism is used for preliminary crushing. The driving motor 5 drives the driving gear 10 to rotate, and the toothed transmission belt 13 is used to drive the driven gear 12 to rotate, so that the rotating tooth block 9 on the rotating seat 8 rotates and cooperates with the fixed tooth block 7 on the opposite side to achieve a rotary extrusion effect. The driving motor 5 adopts a forward and reverse motor to perform forward and reverse reciprocating movements. The rotary extrusion range is set by adjusting the forward and reverse motor stroke according to actual needs. The structure can effectively crush the construction waste and solid waste, and will not cause equipment jamming during relative extrusion, so that iron materials such as steel bars and nails are separated, thereby ensuring the normal operation of the equipment. The crushed construction waste and solid waste will reach the electromagnetic plate 15, and the electromagnetic plate 15 will absorb the iron material when it is running. The reset spring 19 has a reaction force. When the vibrator I16 When the electromagnetic plate 15 is vibrated, since the telescopic rod 18 can be extended and retracted in the fixed tube 17, the reset spring 19 will generate a back and forth reaction force to improve the vibration effect of the electromagnetic plate 15. The vibration characteristics are used to allow the construction waste solid waste without iron materials on the electromagnetic plate 15 to be introduced into the subsequent crushing mechanism. During this process, the roller motor 20 drives the roller rod 21 to rotate the lifting rod 22. The rotation of the lifting rod 22 will wrap the plastic bag, thereby achieving plastic bag screening, thereby ensuring the density of the recycled aggregate to be reused to form recycled concrete; through the crushing mechanism, the drive unit drives the capstan shaft 24 to drive the capstan 23 to rotate. The capstans 23 rotate and intersect with each other, and cooperate with the convex ribs 25 to crush the construction waste solid waste well. Finally, the screen 3 is vibrated and screened to achieve the required particle size. The whole process has a better crushing effect and achieves resource recycling.

[0027] Specifically, the rear plate 4 is a component of the crushing box 2. The electromagnetic plate 15 adopts conventional components of the prior art, and has the function of adsorbing iron materials. It has a magnet function when powered on, and has no magnet function when powered off. When there is no magnet function, the iron material will slide off the electromagnetic plate, and it is more user-friendly. The end of the reset spring 19 abuts against the end of the fixed tube 17, forming relative compression with the electromagnetic plate 15. Vibrator I16 and vibrator II26 adopt conventional components of the prior art. The gap between the capstan 23 and the capstan shaft 24, the gap between the capstan 23 and the inner wall of the crushing box 2, and the gap between the convex rib 25 and the capstan shaft 24 are the requirements for the size of the crushed particles, and the gap is set according to the actual crushed particles.

[0028] Furthermore, a material guide plate 27 and a material discharge guide slope 28 are provided on the crushing box 2 .

[0029] In this embodiment, the guide plate 27 can guide the construction waste solid waste after the iron material is adsorbed and the plastic bag is cleaned, and the discharge guide slope 28 can guide the discharge.

[0030] Furthermore, a telescopic support plate 29 is provided on the crushing box 2, a limiting portion 30 is provided on the telescopic support plate 29, a locking bolt button 31 for locking the telescopic support plate 29 is provided on the front of the crushing box 2, a screening outlet 32 ​​is provided on the side of the crushing box 2, and a blocking member 33 is provided on the screening outlet 32.

[0031] In this embodiment, when the telescopic support plate 29 is extended inward, the electromagnetic plate 15 is first powered off. At this time, the iron material will slide onto the telescopic support plate 29, and then the blocking piece 33 can be opened to take out and clean the iron material from the screening outlet 32. When the telescopic support plate 29 is not needed, the telescopic support plate 29 is pulled outward and locked by locking the bolt button 31. The limit portion 30 plays a shielding role.

[0032] Furthermore, the recycled aggregate conveying mechanism includes a conveying frame 34, a conveying belt 35 and a conveying motor 36. A supporting foot 37 is provided at the bottom of the conveying frame 34. The conveying motor 36 is arranged on the conveying frame 34. The conveying motor 36 drives a driving chain gear 38. A left rotating frame 39 and a right rotating frame 40 are rotatably arranged on the conveying frame 34. The conveying belt 35 is arranged on the outer rings of the left rotating frame 39 and the right rotating frame 40. A central shaft 41 is provided on the right rotating frame 40. A driven chain gear 42 is provided on the central shaft 41. A transmission chain is provided between the driving chain gear 38 and the driven chain gear 42.

[0033] In this embodiment, the driving sprocket 38 is driven by the conveying motor 36, and the driven sprocket 42 is driven by the transmission chain to rotate, so that the right rotating frame 40 rotates. Since the conveyor belt 35 is arranged on the outer ring of the left rotating frame 39 and the right rotating frame 40, the conveyor belt 35 can be driven to transport, which can well perform automatic transportation of crushed recycled aggregate.

[0034] Furthermore, an auxiliary shaft rod 43 is provided on the rear plate 4 , an auxiliary rotating member 44 is rotatably provided on the auxiliary shaft rod 43 , and a rotating shaft II45 is installed between the auxiliary rotating member 43 and the rotating seat 8 .

[0035] In this embodiment, the auxiliary shaft 43 is rotatably arranged to support the auxiliary rotating member 43, and the auxiliary rotating member 43 and the rotating seat 8 are relatively rotated by utilizing the rotating axis II45. This structure can assist the rotation of the rotating seat 8 and ensure the rotation stability.

[0036] Furthermore, the electromagnetic plate 15 is arranged to be inclined at one side.

[0037] In this embodiment, the electromagnetic plate 15 is tilted at one side to facilitate the sliding guide.

[0038] Furthermore, the driving unit includes a mincing drive motor 46 and a transmission gear box 47, the mincing drive motor 46 is driven by a driving pulley 48, the capstan shaft 24 is provided with a gear I49 and a gear II50 that are meshed with each other for transmission, the gear I49 is provided with a gear rod I51, the gear rod I51 is provided with a gear III52, the gear III52 is meshed with a gear IV53, the gear III52 and the gear IV53 are located in the transmission gear box 47, the gear IV53 is provided with a gear rod II54, the gear rod II54 is provided with a driven pulley 55, and a transmission belt 56 is provided between the driving pulley 48 and the driven pulley 55.

[0039] In this embodiment, the driving pulley 48 is driven by the mincing drive motor 46, and the driven pulley 55 is driven by the transmission belt 56, so that the gear rod II54 and the gear IV53 rotate synchronously. Since the gear IV53 and the gear III52 are in a meshing transmission structure, the gear III52 and the gear rod I51 also rotate synchronously, and then the gear I49 also rotates synchronously. Since the mincing mechanism is two capstan shafts, the gear I49 and the gear II50 are in a mutually meshing transmission, which can effectively drive the capstan shaft 24 to rotate synchronously.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A construction waste solid waste recycling and crushing device, comprising a frame (1), characterized in that: The frame (1) is provided with a crushing box (2), and the crushing box (2) is provided with a crushing mechanism, an iron material screening mechanism, a plastic bag collecting mechanism, a crushing mechanism, a screen (3) and a recycled aggregate conveying mechanism from top to bottom. The crushing mechanism comprises a rear plate (4), a driving motor (5), a fixed seat (6), a fixed tooth block (7), a rotating seat (8) and a rotating tooth block (9). The driving motor (5) is fixed on the rear plate (4), and the driving motor (5) drives a driving gear (10) ), the rear plate (4) is provided with a rotating shaft I (11) for rotating the rotating seat (8), the rotating shaft I (11) is provided with a driven gear (12), a toothed transmission belt (13) is provided between the driven gear (12) and the driving gear (10), the fixed seat (6) is mounted on the rear plate (4), the fixed tooth block (7) is mounted on the fixed seat (6), the rotating tooth block (9) is mounted on the rotating seat (8), the iron material screening mechanism comprises a base plate (14), an electromagnetic plate ( 15) and a vibrator I (16), the electromagnetic plate (15) is hingedly arranged on the inner wall of the crushing box (2), a fixing tube (17) is arranged at the bottom of the base plate (14), a telescopic rod (18) is inserted in the fixing tube (17), a return spring (19) is arranged on the outer sleeve of the telescopic rod (18), an end of the telescopic rod (18) is fixedly installed with the electromagnetic plate (15), the vibrator I (16) is located at the bottom of the electromagnetic plate (15), and a roller motor (20) is arranged outside the crushing box (2), The roller motor (20) is driven by a roller rod (21), and a lifting rod (22) is arranged on the roller rod (21). The shredding mechanism comprises a driving unit and a capstan (23), and the driving unit is driven by a capstan shaft (24). The capstans (23) are arranged on the capstan shaft (24) at intervals, and the capstans (23) are arranged to be interlaced with each other. The crushing box (2) is provided with convex ridges (25) inserted between the capstans, and a vibrator II (26) is arranged at the bottom of the screen (3).

2. The construction waste solid waste recycling and crushing device according to claim 1 is characterized by: The crushing box (2) is provided with a material guide plate (27) and a material discharge guide slope (28).

3. The construction waste solid waste recycling and crushing device according to claim 1 is characterized by: The crushing box (2) is provided with a telescopic support plate (29), a limit portion (30) is provided on the telescopic support plate (29), a locking bolt button (31) for locking the telescopic support plate (29) is provided on the front of the crushing box (2), a screening outlet (32) is provided on the side of the crushing box (2), and a blocking member (33) is provided on the screening outlet (32).

4. The construction waste solid waste recycling and crushing device according to claim 1 is characterized by: The recycled aggregate conveying mechanism comprises a conveying frame (34), a conveying belt (35) and a conveying motor (36); a supporting foot (37) is arranged at the bottom of the conveying frame (34); the conveying motor (36) is arranged on the conveying frame (34); a driving chain gear (38) is arranged for driving the conveying motor (36); a left rotating frame (39) and a right rotating frame (40) are rotatably arranged on the conveying frame (34); the conveying belt (35) is arranged on the outer rings of the left rotating frame (39) and the right rotating frame (40); a central shaft (41) is arranged on the right rotating frame (40); a driven chain gear (42) is arranged on the central shaft (41); and a transmission chain is arranged between the driving chain gear (38) and the driven chain gear (42).

5. The construction waste solid waste recycling and crushing device according to claim 1 is characterized by: The rear plate (4) is provided with an auxiliary shaft (43), an auxiliary rotating member (44) is rotatably provided on the auxiliary shaft (43), and a rotating shaft II (45) is installed between the auxiliary rotating member (44) and the rotating seat (8).

6. The construction waste solid waste recycling and crushing device according to claim 1 is characterized by: The electromagnetic plate (15) is arranged to be inclined on one side.

7. The construction waste solid waste recycling and crushing device according to claim 1 is characterized by: The driving unit comprises a grinding drive motor (46) and a transmission gear box (47), wherein the grinding drive motor (46) is driven by a driving pulley (48), the capstan shaft (24) is provided with a gear I (49) and a gear II (50) which are meshed and driven with each other, the gear I (49) is provided with a gear rod I (51), the gear rod I (51) is provided with a gear III (52), the gear III (52) is meshed and driven with a gear IV (53), the gear III (52) and the gear IV (53) are located in the transmission gear box (47), the gear IV (53) is provided with a gear rod II (54), the gear rod II (54) is provided with a driven pulley (55), and a transmission belt (56) is provided between the driving pulley (48) and the driven pulley (55).

Images