Transportation device suitable for spherical materials
By designing a transportation device including a bottom frame, a drive motor, a reducer, a mounting bracket and a synchronization belt, using a universal wheel and a multiple conveyor belt system, the problems of unstable spherical material conveying and difficulty in screening in the prior art are solved, and efficient and stable material conveying and screening effects are achieved.
Patent Information
- Application Number
- CN202411781896.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-02-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When conveying spherical materials, existing plane conveying devices are prone to squeezing and falling of materials due to shake and gravity between them, which affects the conveying effect and efficiency, and cannot effectively screen small particles of impurities or foreign matters.
A transportation device including a bottom frame, a drive motor, a reducer, a mounting bracket and a synchronization belt is designed to collect spherical materials through universal wheels, and use multiple conveyor belts and guide wheel systems to achieve stable material transportation and efficient screening.
It improves the conveying efficiency and stability of spherical materials, can transport materials to a higher level, reduces the floor area, improves the utilization rate of the production workshop, and realizes effective screening of small particles of impurities or foreign matters.
Smart Images
Figure CN119527771A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of mechanical technology, and in particular relates to a transportation device suitable for spherical materials. Background Art
[0002] Conveyor belts are generally classified according to whether they have traction parts or not: conveyor belt equipment with traction parts and conveyor belt equipment without traction parts. There are many types of conveyor belt equipment with traction parts, mainly: belt conveyors, plate conveyors, trolley conveyors, escalators, moving walkways, scraper conveyors, buried scraper conveyors, bucket conveyors, bucket elevators, suspension conveyors and overhead ropeways, etc.
[0003] At present, ordinary plane conveying devices use plane conveyor belts made of rubber, silicone, PVC, polyurethane and other materials. When conveying spherical and easy-to-roll materials, due to the vibration of the conveyor belt and the gravity between the materials, the materials are squeezed against each other, which can easily cause the materials to roll off the conveyor belt or even fall off, affecting the conveying effect and reducing the conveying efficiency. In addition, ordinary plane transmission devices have no screening effect on small particles of impurities or foreign matter contained in the materials. If small particles of impurities or foreign matter need to be screened, a screen or other device must be used for screening, which wastes manpower and reduces efficiency. Summary of the invention
[0004] In view of the deficiencies in the prior art, an object of the embodiments of the present invention is to provide a transportation device suitable for spherical materials to solve the problems in the above-mentioned background technology.
[0005] To achieve the above object, the present invention provides the following technical solutions:
[0006] A transport device suitable for spherical materials, comprising a bottom frame, a first drive motor, a first reducer, a first mounting bracket, a second mounting bracket, a first drive shaft, a second drive shaft and a third drive shaft, wherein the first mounting bracket and the second mounting bracket are respectively mounted on the surface of the bottom frame, and the first drive shaft, the second drive shaft and the third drive shaft are respectively mounted between the first mounting bracket and the second mounting bracket, the first drive motor is mounted on the input side of the first reducer, the first reducer is mounted on the surface of the first bracket, and a first synchronous wheel is mounted on the surface of the output shaft of the first reducer, a second synchronous wheel is mounted on the surface of the first drive shaft, and a first guide wheel is mounted on the surface of the first drive shaft The first drive shaft has a third synchronous wheel, and the first drive shaft has a fourth synchronous wheel, a first synchronous belt is installed between the second synchronous wheel and the first synchronous wheel, a fifth synchronous wheel is installed on the third drive shaft, and the second guide wheel and the third guide wheel are installed on the third drive shaft, a second synchronous belt is installed between the fifth synchronous wheel and the fourth synchronous wheel, a sixth synchronous wheel is installed on the second drive shaft, and the fourth guide wheel and the fifth guide wheel are installed on the second drive shaft, a third synchronous belt is installed between the sixth synchronous wheel and the fourth synchronous wheel, a second cylinder is installed between the second mounting bracket and the bottom frame, and a first cylinder is installed between the first mounting bracket and the bottom frame.
[0007] As a further scheme of the present invention, the third mounting bracket is installed above the bottom frame, the fourth bracket is installed above the tenth bracket, and the second reducer is installed on the surface of the fourth bracket, the second drive motor is installed on the input side of the second reducer, and the first gear is installed on the output shaft of the second reducer, the first gear shaft is installed between the tenth bracket and the fourth bracket, and the seventh synchronous wheel is installed on the surface of the first gear shaft, the fourth transmission shaft is installed on the third mounting bracket and the bottom frame, the eighth synchronous wheel and the ninth synchronous wheel are installed on the surface of the fourth transmission shaft, the fourth synchronous belt is installed between the eighth synchronous wheel and the seventh synchronous wheel, the fifth transmission shaft is installed on the surface of the bottom frame, the tenth synchronous wheel and the first pulley are installed on the surface of the fifth transmission shaft, the sixth synchronous belt is installed between the ninth synchronous pulley and the tenth synchronous pulley, the sixth transmission shaft is installed between the third mounting bracket and the bottom frame, the second pulley is installed on the surface of the sixth transmission shaft, the first conveyor belt is installed between the first pulley and the second pulley, the right side structure of the device is symmetrical with the left side structure, and an encoder is installed on the top of the sixth transmission shaft.
[0008] As a further solution of the present invention, a third reducer is installed at the bottom of the third mounting bracket, a second gear is installed on the output shaft of the third reducer, and a third drive motor is installed on the input side of the third reducer. A first gear plate is installed on the surface of the third mounting bracket, and the first gear plate is meshed with the second gear.
[0009] As a further solution of the present invention, a launching frame is installed on the first gear plate, a fourth driving motor is installed on the surface of the launching frame, a third gear is installed on the output shaft of the fourth driving motor, the third gear is meshed with the first rack, and the first rack is installed on the fifth mounting bracket.
[0010] As a further scheme of the present invention, a fifth mounting bracket is installed on the surface of the launch frame, an eleventh synchronous wheel is installed on the surface of the fifth mounting bracket, a twelfth synchronous wheel and a thirteenth synchronous wheel are installed on the surface of the launch frame, a seventh synchronous wheel is installed between the eleventh synchronous wheel and the twelfth synchronous wheel, the twelfth synchronous wheel and the thirteenth synchronous wheel are simultaneously installed on the seventh drive shaft, the right side structure of the device is symmetrical with the left side structure, the fourteenth synchronous wheel is connected to the second gear shaft, an eighth synchronous belt is installed on the surface of the fourteenth synchronous wheel and the thirteenth synchronous wheel, the second gear shaft is respectively meshed with the output shafts of the fifth drive motor and the sixth drive motor, and a launching wheel is installed on the surface of the seventh drive shaft.
[0011] As a further scheme of the present invention, a fourth reducer is installed on the side of the third mounting bracket, a fifteenth synchronous wheel is installed on the output shaft of the fourth reducer, and a seventh drive motor is installed on the input side of the fourth reducer, an eighth drive shaft and a ninth drive shaft are installed on the third mounting bracket, a sixteenth synchronous wheel, a third pulley and a sixth guide wheel are installed on the surface of the eighth drive shaft, a ninth synchronous belt is installed between the fifteenth synchronous wheel and the sixteenth synchronous wheel, a fourth pulley and a seventh guide wheel are installed on the surface of the ninth drive shaft, and a second conveyor belt is installed between the third pulley and the fourth pulley.
[0012] Beneficial effects: The present invention collects spherical materials through universal wheels, replacing manual loading and improving efficiency. The device can transport spherical materials to a higher level, replacing the traditional crawler conveying method. Compared with the traditional conveying method, it reduces the floor space and greatly improves the utilization rate of the production workshop.
[0013] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is the front view of the invention.
[0015] Figure 2 It is a left side view of the invention.
[0016] Figure 3 A top view of the invention.
[0017] Figure 4 It is a schematic diagram of the structure of the invention.
[0018] Figure 5 It is a schematic diagram of the structure of the invention.
[0019] Figure 6 It is a schematic diagram of the structure of the invention.
[0020] Figure 7 It is a schematic diagram of the structure of the invention.
[0021] Figure 8 It is a schematic diagram of the structure of the invention.
[0022] Fig. 9 It is a schematic diagram of the structure of the invention.
[0023] Figure numerals: 1, first drive motor, 2, first reducer, 3, fourth guide wheel, 4, first synchronous belt, 5, first synchronous wheel, 6, second synchronous belt, 7, second drive shaft, 8, fifth guide wheel, 9, second guide wheel, 10, third synchronous wheel, 11, sixth synchronous wheel, 12, third drive shaft, 13, third guide wheel, 14, third synchronous wheel, 15, second mounting bracket, 16, fifth synchronous wheel, 17, first bracket, 18, second synchronous wheel, 19, first drive shaft, 20, fourth synchronous wheel, 21, first guide wheel, 22, bottom frame, 23, second cylinder, 24, first cylinder, 25, third bracket, 26, second drive motor, 27, second reducer, 28, fourth mounting bracket, 29, first gear, 30, first gear shaft, 31, seventh synchronous wheel, 32, fourth synchronous belt, 33, eighth synchronous belt, 34, fourth transmission shaft, 35, ninth synchronous wheel, 36, sixth synchronous belt, 37, tenth synchronous wheel, 38, first pulley, 39. The fifth transmission shaft, 40. The first conveyor belt, 41. The second pulley, 42. The sixth transmission shaft, 43. The encoder, 44. The first gear plate, 45. The third drive motor, 46. The third reducer, 47. The second gear, 48. The fifth drive motor, 49. The sixth drive motor, 50. The second gear shaft, 51. The fourteenth synchronous wheel, 52. The eighth synchronous belt, 53. The thirteenth synchronous wheel, 54. The twelfth synchronous wheel, 55. The seventh synchronous wheel, 56. The eleventh synchronous wheel, 5 7. The fifth mounting bracket, 58. The first rack, 59. The third gear, 60. The fourth drive motor, 61. The launching wheel, 62. The launching frame, 63. The seventh drive shaft, 64. The seventh drive motor, 65. The fourth reducer, 66. The fifteenth synchronous wheel, 67. The sixteenth synchronous wheel, 68. The ninth synchronous belt, 69. The third pulley, 70. The third pulley, 71. The second conveyor belt, 72. The ninth drive shaft, 73. The seventh guide wheel, 74. The eighth drive shaft, 75. The sixth guide wheel. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution 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. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0025] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.
[0026] Example 1
[0027] See also Figures 1 to 6 A transport device suitable for spherical materials includes a bottom frame 22, a first drive motor 1, a first reducer 2, a first mounting bracket 17, a second mounting bracket 15, a first drive shaft 19, a second drive shaft 7 and a third drive shaft 12, the first mounting bracket 17 and the second mounting bracket 15 are respectively mounted on the surface of the bottom frame 22, and the first drive shaft 19, the second drive shaft 7 and the third drive shaft 12 are respectively mounted between the first mounting bracket 17 and the second mounting bracket 15, the first drive motor 1 is mounted on the input side of the first reducer 2, the first reducer 2 is mounted on the surface of the first bracket 17, and the first synchronous wheel 5 is mounted on the surface of the output shaft of the first reducer 2, the second synchronous wheel 18 is mounted on the surface of the first drive shaft 19, and the first guide wheel 21 is mounted on the surface of the first drive shaft 19, the first A third synchronous wheel 14 is mounted on the surface of the driving shaft 19, and a fourth synchronous wheel 20 is mounted on the surface of the first driving shaft 19, a first synchronous belt 4 is mounted between the second synchronous wheel 18 and the first synchronous wheel 5, a fifth synchronous wheel 16 is mounted on the surface of the third driving shaft 12, and a second guide wheel 9 and a third guide wheel 13 are mounted on the surface of the third driving shaft 12, a second synchronous belt 6 is mounted between the fifth synchronous wheel 16 and the fourth synchronous wheel 20, a sixth synchronous wheel 11 is mounted on the surface of the second driving shaft 7, and a fourth guide wheel 3 and a fifth guide wheel 8 are mounted on the surface of the second driving shaft 7, a third synchronous belt 10 is mounted between the sixth synchronous wheel 11 and the fourth synchronous wheel 20, a second cylinder 23 is mounted between the second mounting bracket 15 and the bottom frame 22, and a first cylinder 24 is mounted between the first mounting bracket 17 and the bottom frame 22.
[0028] Preferably, the third mounting bracket 25 of the present invention is mounted above the bottom frame 22, the fourth bracket 28 is mounted above the tenth bracket 28, and the second reducer 27 is mounted on the surface of the fourth bracket 28, the second drive motor 26 is mounted on the input side of the second reducer 27, and the first gear 29 is mounted on the output shaft of the second reducer 27, the first gear shaft 30 is mounted between the tenth bracket 28 and the fourth bracket 25, and the seventh synchronous wheel 31 is mounted on the surface of the first gear shaft 30, the fourth transmission shaft 34 is mounted on the third mounting bracket 25 and the bottom frame 22, and the eighth synchronous wheel 33 and the ninth synchronous wheel 34 are mounted on the surface of the fourth transmission shaft 34 35, a fourth synchronous belt 32 is installed between the eighth synchronous wheel 33 and the seventh synchronous wheel 31, a fifth transmission shaft 39 is installed on the surface of the bottom frame 22, a tenth synchronous wheel 37 and a first pulley 38 are installed on the surface of the fifth transmission shaft 39, a sixth synchronous belt 36 is installed between the ninth synchronous pulley 35 and the tenth synchronous pulley 37, a sixth transmission shaft 42 is installed between the third mounting bracket 25 and the bottom frame 22, a second pulley 41 is installed on the surface of the sixth transmission shaft 42, a first conveyor belt 40 is installed between the first pulley 38 and the second pulley 41, the right side structure of the device is symmetrical with the left side structure, and an encoder 43 is installed on the top of the sixth transmission shaft 42.
[0029] Example 2
[0030] See also Figures 1 to 9 A transportation device suitable for spherical materials also includes a third mounting bracket 25, a third reducer 46 is installed at the bottom of the third mounting bracket 25, a second gear 47 is installed on the output shaft of the third reducer 46, and a third driving motor 45 is installed on the input side of the third reducer 46, and a first gear plate 44 is installed on the surface of the third mounting bracket, and the first gear plate 44 is meshed with the second gear 47.
[0031] Preferably, a launching frame 62 is installed on the first gear plate 44 of the present invention, a fourth driving motor 60 is installed on the surface of the launching frame 62, a third gear 59 is installed on the output shaft of the fourth driving motor 60, the third gear 59 is meshed with the first rack 58, and the first rack 58 is installed on the fifth mounting bracket 57.
[0032] Preferably, the fifth mounting bracket 57 of the present invention is mounted on the surface of the launching frame 62, the eleventh synchronous wheel 56 is mounted on the surface of the fifth mounting bracket 57, the twelfth synchronous wheel 54 and the thirteenth synchronous wheel 53 are mounted on the surface of the launching frame 62, the seventh synchronous wheel 55 is installed between the eleventh synchronous wheel 56 and the twelfth synchronous wheel 54, the twelfth synchronous wheel 54 and the thirteenth synchronous wheel 53 are simultaneously mounted on the seventh driving shaft 63, the right side structure of the device is symmetrical with the left side structure, the fourteenth synchronous wheel 51 is connected to the second gear shaft 50, the eight synchronous belt 52 is mounted on the surface of the fourteenth synchronous wheel 51 and the thirteenth synchronous wheel 53, the second gear shaft 50 is respectively meshed with the output shafts of the fifth driving motor 48 and the sixth driving motor 49, and the launching wheel 61 is mounted on the surface of the seventh driving shaft 63.
[0033] Preferably, the fourth reducer 65 is installed on the side of the third mounting bracket 25 of the present invention, the fifteenth synchronous wheel 66 is installed on the output shaft of the fourth reducer 65, and the seventh drive motor 64 is installed on the input side of the fourth reducer 65, the third mounting bracket 25 is installed with the eighth drive shaft 74 and the ninth drive shaft 72, the sixteenth synchronous wheel 67, the third pulley 69 and the sixth guide wheel 75 are installed on the surface of the eighth drive shaft 74, the ninth synchronous belt 68 is installed between the fifteenth synchronous wheel 66 and the sixteenth synchronous wheel 67, the fourth pulley 70 and the seventh guide wheel 73 are installed on the surface of the ninth drive shaft 72, and the second conveyor belt 71 is installed between the third pulley 69 and the fourth pulley 70.
[0034] The transport device for spherical materials of the present invention, when in use, the first drive motor 1 drives the fourth guide wheel 3 to transport the spherical material to the fifth guide wheel 8, the first drive motor simultaneously drives the fifth guide wheel 8, the second guide wheel 9 and the first guide wheel 21 to transport the spherical material to between the two first conveyor belts 40, the first conveyor belt 40 is driven by the second drive motor 26 to transport the spherical material to between the seventh guide wheel 73 and the sixth guide wheel 75, the seventh guide wheel 73 and the sixth guide wheel 75 are driven by the seventh drive motor 64 to transport the spherical material to the launching wheel 61, the launching wheel 61 launches the spherical material to a height under the joint action of the fifth drive motor 48 and the sixth drive motor 49, the third drive motor 45 controls the rotation direction of the first gear plate 44 and the launching frame 62, thereby controlling the conveying direction of the spherical material.
[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A transport device suitable for spherical materials, characterized in that The invention comprises a bottom frame (22), a first driving motor (1), a first reducer (2), a first mounting bracket (17), a second mounting bracket (15), a first driving shaft (19), a second driving shaft (7) and a third driving shaft (12); the first mounting bracket (17) and the second mounting bracket (15) are respectively mounted on the surface of the bottom frame (22); the first driving shaft (19), the second driving shaft (7) and the third driving shaft (12) are respectively mounted between the first mounting bracket (17) and the second mounting bracket (15); the first driving motor (1) is mounted on the input side of the first reducer (2); the first reducer (2) is mounted on the surface of the first bracket (17); the first synchronous wheel (5) is mounted on the surface of the output shaft of the first reducer (2); the second synchronous wheel (18) is mounted on the surface of the first driving shaft (19); the first guide wheel (21) is mounted on the surface of the first driving shaft (19); the first guide wheel (22) is mounted on the surface of the first driving shaft (19); the first guide wheel (23) is mounted on the surface of the first driving shaft (19); the first guide wheel (24) is mounted on the surface of the first driving shaft (19); the first guide wheel (25) is mounted on the surface of the first driving shaft (19); the first guide wheel (26) is mounted on the surface of the first driving shaft (19); the first guide wheel (27) is mounted on the surface of the first driving shaft (19); the first guide wheel (28) is mounted on the surface of the first driving shaft (19); the first guide wheel (29) is mounted on the surface of the first driving shaft (19); the first guide wheel (21 ...2) is mounted on the surface of the first driving shaft (1 The invention relates to a plurality of synchronous wheels (14), a fourth synchronous wheel (20) is installed on the surface of the first drive shaft (19), a first synchronous belt (4) is installed between the second synchronous wheel (18) and the first synchronous wheel (5), a fifth synchronous wheel (16) is installed on the surface of the third drive shaft (12), a second guide wheel (9) and a third guide wheel (13) are installed on the surface of the third drive shaft (12), a second synchronous belt (6) is installed between the fifth synchronous wheel (16) and the fourth synchronous wheel (20), a sixth synchronous wheel (11) is installed on the surface of the second drive shaft (7), a fourth guide wheel (3) and a fifth guide wheel (8) are installed on the surface of the second drive shaft (7), a third synchronous belt (10) is installed between the sixth synchronous wheel (11) and the fourth synchronous wheel (20), a second cylinder (23) is installed between the second mounting bracket (15) and the bottom frame (22), and a first cylinder (24) is installed between the first mounting bracket (17) and the bottom frame (22).
2. A transport device suitable for spherical materials according to claim 1, characterized in that: The third mounting bracket (25) is mounted above the bottom frame (22), the fourth bracket (28) is mounted above the tenth bracket (28), and a second reducer (27) is mounted on the surface of the fourth bracket (28), a second drive motor (26) is mounted on the input side of the second reducer (27), and a first gear (29) is mounted on the output shaft of the second reducer (27), a first gear shaft (30) is mounted between the tenth bracket (28) and the fourth bracket (25), and a seventh synchronous wheel (31) is mounted on the surface of the first gear shaft (30), a fourth transmission shaft (34) is mounted on the third mounting bracket (25) and the bottom frame (22), an eighth synchronous wheel (33) and a ninth synchronous wheel (35) are mounted on the surface of the fourth transmission shaft (34), and a first gear shaft (30) is mounted between the first gear shaft (30) and the bottom frame (22). A fourth synchronous belt (32) is installed between the eighth synchronous wheel (33) and the seventh synchronous wheel (31), a fifth transmission shaft (39) is installed on the surface of the bottom frame (22), a tenth synchronous wheel (37) and a first pulley (38) are installed on the surface of the fifth transmission shaft (39), a sixth synchronous belt (36) is installed between the ninth synchronous pulley (35) and the tenth synchronous pulley (37), a sixth transmission shaft (42) is installed between the third mounting bracket (25) and the bottom frame (22), a second pulley (41) is installed on the surface of the sixth transmission shaft (42), a first conveyor belt (40) is installed between the first pulley (38) and the second pulley (41), the right side structure of the device is symmetrical with the left side structure, and an encoder (43) is installed on the top of the sixth transmission shaft (42).
3. A transport device suitable for spherical materials according to claim 1, characterized in that: A third reducer (46) is installed at the bottom of the third mounting bracket (25), a second gear (47) is installed on the output shaft of the third reducer (46), and a third driving motor (45) is installed on the input side of the third reducer (46). A first gear plate (44) is installed on the surface of the third mounting bracket, and the first gear plate (44) is meshed with the second gear (47).
4. A transport device suitable for spherical materials according to claim 1, characterized in that: A launching frame (62) is mounted on the first gear plate (44), a fourth driving motor (60) is mounted on the surface of the launching frame (62), a third gear (59) is mounted on the output shaft of the fourth driving motor (60), the third gear (59) is meshed with the first rack (58), and the first rack (58) is mounted on a fifth mounting bracket (57).
5. A transport device suitable for spherical materials according to claim 4, characterized in that: The fifth mounting bracket (57) is mounted on the surface of the launching frame (62), the eleventh synchronous wheel (56) is mounted on the surface of the fifth mounting bracket (57), the twelfth synchronous wheel (54) and the thirteenth synchronous wheel (53) are mounted on the surface of the launching frame (62), the seventh synchronous wheel (55) is mounted between the eleventh synchronous wheel (56) and the twelfth synchronous wheel (54), the twelfth synchronous wheel (54) and the thirteenth synchronous wheel (53) are simultaneously mounted on the seventh driving shaft (63), the right side structure of the device is symmetrical with the left side structure, the fourteenth synchronous wheel (51) is connected to the second gear shaft (50), the eighteenth synchronous belt (52) is mounted on the surface of the fourteenth synchronous wheel (51) and the thirteenth synchronous wheel (53), the second gear shaft (50) is respectively meshed with the output shafts of the fifth driving motor (48) and the sixth driving motor (49), and the launching wheel (61) is mounted on the surface of the seventh driving shaft (63).
6. A transport device suitable for spherical materials according to claim 1, characterized in that: The fourth reducer (65) is installed on the side of the third mounting bracket (25), the fifteenth synchronous wheel (66) is installed on the output shaft of the fourth reducer (65), and the seventh drive motor (64) is installed on the input side of the fourth reducer (65), the eighth drive shaft (74) and the ninth drive shaft (72) are installed on the third mounting bracket (25), the sixteenth synchronous wheel (67), the third pulley (69) and the sixth guide wheel (75) are installed on the surface of the eighth drive shaft (74), the ninth synchronous belt (68) is installed between the fifteenth synchronous wheel (66) and the sixteenth synchronous wheel (67), the fourth pulley (70) and the seventh guide wheel (73) are installed on the surface of the ninth drive shaft (72), and the second conveyor belt (71) is installed between the third pulley (69) and the fourth pulley (70).