A casting clay sand mixing device

Abstract

The present invention relates to a foundry clay sand mixing device, and belongs to the technical field of foundry clay sand mixing equipment. The foundry clay sand mixing device comprises a lifting belt conveyor, a sand mixer, a parabolic device and a screener; a lifting belt conveyor is arranged on one side of the sand mixer; a parabolic device is arranged below the other side of the sand mixer; a screener is arranged on one side of the parabolic device; a return belt is arranged below the parabolic device; one end of the return belt is connected to the inlet of the lifting belt conveyor. The foundry clay sand mixing device has a compact structure and an ingenious design. It solves the problems of "easy deformation" and "low screening efficiency" existing in the existing foundry clay sand mixing machine through the rolling wheel and the parabolic device, and is particularly suitable for the use of foundry clay sand mixing.

Description

Technical Field

[0001] The invention relates to a foundry clay sand mixing device, belonging to the technical field of foundry clay sand mixing equipment. Background Art

[0002] A sand mixer is a device that evenly mixes the various components in the molding sand and effectively coats the surface of the sand particles with a binder. Existing sand mixers are mainly roller sand mixers, such as a foundry clay sand mixer disclosed in the utility model patent with announcement number CN209477215U. Although it can meet the use requirements of foundry clay sand mixing to a certain extent, it has the following problems.

[0003] 1. When the grinding wheel of the existing sand mixer is working, the impact of the grinding wheel is increased by moving the weight block and the spring. However, the weight block impacts the inside of the grinding wheel, and it is difficult to transmit the impact force to the outside of the grinding wheel.

[0004] 2. The existing rolling wheel has no buffer mechanism. When the reaction force of the molding sand on the rolling wheel is too large, the rolling wheel is very likely to be deformed.

[0005] 3. After the existing roller completes the sand mixing, it needs to use a screen to screen separately, which has the problem of "low screening efficiency".

[0006] Therefore, it is necessary to develop a new foundry clay sand mixing device to solve the above problems existing in the existing foundry clay sand mixing machine. Summary of the invention

[0007] The technical solution of the present invention is to provide a foundry clay sand mixing device with compact structure and ingenious design to solve the problems of easy deformation and "low screening efficiency" of the existing foundry clay sand mixing machine.

[0008] The technical solution of the present invention is:

[0009] A foundry clay sand mixing device comprises a lifting belt conveyor, a sand mixer, a parabolic device and a screener; the characteristics are: the lifting belt conveyor is arranged on one side of the sand mixer; the parabolic device is arranged below the other side of the sand mixer; the screener is arranged on one side of the parabolic device; a return belt is arranged below the parabolic device; one end of the return belt is connected to the inlet of the lifting belt conveyor.

[0010] The sand mixer comprises a sand mixing box, a grinding wheel, a driving motor and a material scraper; a rotating shaft is arranged inside the sand mixing box; the lower end of the rotating shaft extends to the lower part of the sand mixing box, and the bottom end of the sand mixing box is equipped with a driving motor; the driving motor is connected to the lower end of the rotating shaft through a transmission belt; a material scraper is arranged on the rotating shaft inside the sand mixing box; pushing rods are fixedly installed on the rotating shafts on both sides of the material scraper; a grinding wheel is arranged on the end of the pushing rod; a material discharge port is opened at the bottom of the sand mixing box; a parabolic device is arranged on the sand mixing box below the material discharge port.

[0011] The rolling wheel includes a rolling ring, a sealing plate, a sealing ring, a sealer, an insertion rod, a telescopic sleeve, a buffer spring and a guide claw; a rolling ring is arranged on the outer side of one end of the push rod; a sealing plate is fixedly mounted on one end of the rolling ring; a sealing ring is fixedly mounted on the other end of the rolling ring; the sealing ring is connected to the push rod through the sealer; an insertion rod is fixedly mounted on the push rod inside the rolling ring; a telescopic sleeve is inserted at the lower end of the insertion rod; a buffer spring is arranged between the inside of the telescopic sleeve and the insertion rod; guide claws are fixedly mounted on both sides of the lower end of the telescopic sleeve; the guide claws are slidably connected to the rolling ring.

[0012] The sealer comprises a sealing ring and a sealing slip ring; a sealing ring is fixedly mounted on one side of the sealing ring; a sealing ring groove is arranged on the inner wall of the sealing ring; a sealing slip ring is fixedly mounted on the push rod on the inner side of the sealing ring plate; the sealing slip ring maintains a sliding sealing connection with the sealing ring through the sealing ring groove.

[0013] Guide ring grooves are symmetrically arranged on both sides of the inner wall of the rolling ring; and the guide claws are slidably connected with the guide ring grooves.

[0014] The parabolic device includes a parabolic box, a driving wheel, a driven wheel and a parabolic belt; the lower part of the sand mixing box is provided with the parabolic box in an inclined state; a feeding port is provided on the top of the parabolic box; the parabolic box is connected with the sand mixing box through the feeding port and the feeding port; a parabolic belt is installed in the parabolic box through the driving wheel and the driven wheel; the parabolic belt is provided in an inclined state; and a plurality of parabolic ridges are evenly provided on the surface of the parabolic belt.

[0015] A tension wheel is arranged between the driving wheel and the driven wheel; the tension wheel is connected with the inner part of the parabolic belt in a conflicting manner; and an arc bottom plate is arranged at the bottom of the parabolic box below.

[0016] The screener comprises a screen frame, a screen barrel and a rotating shaft; the screen frame is provided with a screen barrel via the rotating shaft; the screen barrel is arranged in an inclined state; the screen barrel is evenly provided with screen meshes; the screen frame is provided with a screen motor; the screen motor is connected to one end of the rotating shaft via a transmission belt.

[0017] The advantages of the present invention are:

[0018] The foundry clay sand mixing device has a compact structure and ingenious design. It solves the problems of "easy deformation" and "low screening efficiency" of the existing foundry clay sand mixing machine through the rolling wheel and the parabolic device, and is particularly suitable for the use of foundry clay sand mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the sand mixer of the present invention;

[0021] Figure 3 for Figure 2 A schematic diagram of a top view structure;

[0022] Figure 4 It is a structural schematic diagram of the rolling wheel of the present invention;

[0023] Figure 5 for Figure 4 Schematic diagram of the structure in the middle AA direction;

[0024] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at B in the middle;

[0025] Figure 7 for Figure 5 Schematic diagram of the enlarged structure at C in the middle;

[0026] Figure 8 It is a structural schematic diagram of the rolling ring of the present invention;

[0027] Fig. 9 It is a structural schematic diagram of the parabola of the present invention;

[0028] Fig.10 It is a schematic structural diagram of the sifter of the present invention.

[0029] In the figure: 1. sand mixer; 2. lifting belt conveyor; 3. parabolic device; 4. sifter; 5. return belt; 6. sand mixing box; 7. rotating shaft; 8. driving motor; 9. material scraper; 10. pushing rod; 11. grinding wheel; 12. feeding port; 13. screening motor; 14. grinding ring; 15. sealing plate; 16. sealing ring; 17. sealer; 18. plug rod; 19. telescopic sleeve; 20. buffer spring; 21. guide claw; 22. sealing ring; 23. sealing slip ring; 24. guide ring groove; 25. parabolic box; 26. feeding port; 27. driving wheel; 28. driven wheel; 29. ​​parabolic belt; 30. parabolic ridge plate; 31. tensioning wheel; 32. arc bottom plate; 33. screening frame; 34. rotating shaft; 35. screening barrel; 36. sealing ring groove. DETAILED DESCRIPTION

[0030] The foundry clay sand mixing device comprises a lifting belt conveyor 2, a sand mixer 1, a parabolic device 3 and a screener 4 (see the attached manual). Figure 1 ).

[0031] The sand mixer 1 comprises a sand mixing box 6, a grinding wheel 11, a driving motor 8 and a material scraper 9 (see the attached manual). Figure 2 and 3 ).

[0032] The interior of the sand mixing box 6 is provided with a rotating shaft 7; the lower end of the rotating shaft 7 extends to the lower part of the sand mixing box 6, and the bottom end of the sand mixing box 6 is provided with a driving motor 8; the driving motor 8 is connected to the lower end of the rotating shaft 7 through a transmission belt. When working, the driving motor 8 can drive the rotating shaft 7 to rotate through the transmission belt.

[0033] The rotating shaft 7 inside the sand mixing box 6 is equipped with a scraper 9 (see the attached manual). Figure 2 and 3 ). When the rotating shaft 7 rotates, the material scraper 9 can be driven to rotate synchronously.

[0034] The rotating shaft 7 on both sides of the scraper 9 is fixed with a push rod 10; the end of the push rod 10 is equipped with a roller 11 (see the attached manual). Figure 2 and 3 ). When the rotating shaft 7 rotates, the roller 11 can be driven to rotate synchronously through the push rod 10.

[0035] The roller 11 includes a roller ring 14, a sealing plate 15, a sealing ring 16, a sealer 17, an insert rod 18, a telescopic sleeve 19, a buffer spring 20 and a guide claw 21 (see the attached manual). Figure 4 and 5 ).

[0036] A rolling ring 14 is arranged outside one end of the push rod 10 (see the attached manual). Figure 4 and 5 The inner wall of the roller ring 14 is symmetrically provided with guide ring grooves 24 (see the attached manual). Figure 8 ).

[0037] The push rod 10 inside the rolling ring 14 is fixed with an insertion rod 18; a telescopic sleeve 19 is inserted at the lower end of the insertion rod 18; a buffer spring 20 is arranged between the inside of the telescopic sleeve 19 and the insertion rod 18 (see the attached manual). Figure 5 and 7 ). Under the action of the elastic force of the buffer spring 20, the telescopic sleeve 19 always has a tendency to move downward relative to the insertion rod 18.

[0038] When the rotating shaft 7 rotates, the push rod 10 can drive the insertion rod 18 and the telescopic sleeve 19 to rotate synchronously. The lower end of the telescopic sleeve 19 is fixed with guide claws 21 on both sides; the guide claws 21 are kept in sliding connection with the rolling ring 14 through the guide ring groove 24 (see the appendix of the manual). Figure 5 and 7 ). During the process of the telescopic sleeve 19 revolving around the rotating shaft 7, the telescopic sleeve 19 can push the rolling ring 14 to revolve around the rotating shaft 7 while rotating on its own through the guide claws 21.

[0039] The purpose of arranging the buffer spring 20 between the telescopic sleeve 19 and the inside of the telescopic sleeve 19 and the insertion rod 18 is: first, the telescopic sleeve 19 can squeeze the rolling ring 14 through the guide claw 21 under the elastic force of the buffer spring 20, so that the rolling ring 14 can always maintain a certain pressure and keep rolling connection with the bottom of the sand mixing box 6, thereby ensuring the effect of the rolling ring 14 rolling and crushing the casting clay sand. Second, when hard foreign objects (such as bolts and stones) are mixed in the sand mixing box 6, the hard foreign objects can squeeze the rolling ring 14, so that it pushes the telescopic sleeve 19 to overcome the elastic force of the buffer spring 20 and then move upward, thereby solving the problem of easy jamming and easy deformation when the existing rolling wheel 11 directly squeezes hard foreign objects.

[0040] A sealing plate 15 is fixedly mounted at one end of the rolling ring 14 (see the attached manual). Figure 5 The sealing plate 15 can seal one end of the rolling ring 14, thereby preventing the casting clay sand from entering the interior of the rolling ring 14 from one end during operation, causing the casting clay sand to get stuck in the rolling ring 14.

[0041] The other end of the rolling ring 14 is fixed with a sealing ring 16; there is a certain gap between the inner ring of the sealing ring 16 and the push rod 10 (see the attached manual). Figure 6 The purpose of providing the sealing ring 16 is to avoid the problem of collision between the sealing ring 16 and the push rod 10 when the push rod 10 and the rolling ring 14 move relative to each other.

[0042] The sealing ring 16 is connected to the push rod 10 through the sealer 17 (see the appendix of the specification). Figure 5 ); The sealer 17 includes a sealing ring 22 and a sealing ring 16; the sealing ring 22 is fixedly mounted on one side of the sealing ring 16; a sealing ring groove 36 is provided on the inner wall of the sealing ring 22; a sealing slip ring 23 is fixedly mounted on the push rod 10 on the inner side of the sealing ring 16 plate; the sealing slip ring 23 maintains a sliding sealing connection with the sealing ring 22 through the sealing ring groove 36 (see the attached manual Figure 5 and 6 ). The purpose of setting the sealer 17 is to enable the push rod 10 to maintain a sliding sealing connection with the sealing ring 22 through the sealing sliding ring 23; in this way, it can ensure that the end surface of the rolling ring 14 can be sealed by the sealing ring 16, the sealing ring 22 and the sealing sliding ring 23, thereby preventing the casting clay from entering the rolling ring 14, and it can also ensure that the push rod 10 maintains a movably connected with the sealing ring 16 through the sealing sliding ring 23 and the sealing ring 22, thereby avoiding the problem of "stuck" when the push rod 10 and the sealing ring 16 move relative to each other.

[0043] A lifting belt conveyor 2 is provided on one side of the sand mixer 1 (see the attached manual). Figure 1 The lifting belt conveyor 2 is an externally purchased device. When working, the lifting belt conveyor 2 can input the casting clay sand to be processed into the sand mixing box 6 of the sand mixer 1.

[0044] The bottom of the sand mixing box 6 is provided with a feed opening 12 (see the attached manual). Figure 2 and 3 ); A parabolic device 3 is installed on the mixing box 6 below the feeding port 12 (see the attached manual Figure 1 ).

[0045] The parabolic device 3 includes a parabolic box 25, a driving wheel 27, a driven wheel 28 and a parabolic belt 29 (see the attached manual). Fig. 9 The lower part of the sand mixing box 6 is provided with a parabolic box 25 in an inclined shape; a feed port 26 is provided on the top of the parabolic box 25; the parabolic box 25 is connected to the sand mixing box 6 through the feed port 26 and the discharge port 12 (see the attached manual). Figure 2 and 9 During operation, the foundry clay sand in the sand mixing box 6 can enter the parabolic box 25 through the feed opening 12 and the feed opening 26 .

[0046] The parabolic box 25 is provided with a parabolic belt 29 (see the appendix of the specification) through a driving wheel 27 and a driven wheel 28. Fig. 9 When the driving wheel 27 and the driven wheel 28 are working, the parabolic belt 29 can be driven to rotate synchronously.

[0047] The parabolic belt 29 is arranged in an inclined shape; the surface of the parabolic belt 29 is evenly provided with a plurality of parabolic ridges 30 (see the attached manual Fig. 9 The purpose of setting the parabolic belt 29 in this way is to enable the rotating parabolic belt 29 to throw the material into the parabolic box 25 through the parabolic edge plate 30 during operation.

[0048] A tensioning wheel 31 is installed between the driving wheel 27 and the driven wheel 28; the tensioning wheel 31 is connected to the inner part of the parabolic belt 29; the bottom of the parabolic box 25 below is provided with an arc bottom plate 32 (see the attached manual Fig. 9 ). The purpose of setting the tension wheel 31 and the arc bottom plate 32 is to make the lower end of the parabolic belt 29 vibrate under the action of the tension wheel 31 when the parabolic belt 29 rotates, so as to shake off the materials and prevent them from sticking. When the materials are shaken off and accumulated on the arc bottom plate 32, the rotating parabolic belt 29 can take the materials out through the parabolic ridge plate 30, thereby avoiding the problem of the materials accumulating in the parabolic box 25 and being difficult to discharge.

[0049] A screener 4 is provided on one side of the parabolic 3 (see the attached manual). Figure 1 ); there is a certain gap between the screener 4 and the parabola 3; a return belt 5 is arranged under the parabola 3; one end of the return belt 5 is connected to the inlet of the lifting belt conveyor 2.

[0050] The purpose of such arrangement is that, since the material (foundry clay sand) is mixed by the sand mixer 1, the qualified material has the characteristics of small particles and light weight, so the characteristics of light weight and long throwing distance can be utilized to set a certain gap between the screener 4 and the parabola 3; in this way, it can be ensured that the qualified material can enter the screener 4 for screening, and the unqualified material will fall into the return belt 5, and then the return belt 5 can transport the unqualified material to the lifting belt conveyor 2 to re-participate in the circulation.

[0051] The sifter 4 includes a sifting frame 33, a sifting barrel 35 and a rotating shaft 34 (see the attached manual). Fig.10 ). A screening barrel 35 is mounted on the screening frame 33 through a rotating shaft 34; the screening barrel 35 is arranged in an inclined shape; screening meshes are evenly distributed on the screening barrel 35; a screening motor 13 is mounted on the screening frame 33; the screening motor 13 is connected to one end of the rotating shaft 34 through a transmission belt. When working, the screening motor 13 can drive the screening barrel 35 to rotate synchronously through the transmission belt and the rotating shaft 34; in this way, when qualified materials enter the screening barrel 35, the rotating screening barrel 35 can screen the materials again. For a small number of unqualified materials, as the screening barrel 35 rotates unevenly, the materials collide with each other and can be dispersed again into qualified products under the action of the screening barrel 35 and output from the screening barrel 35 through the screening meshes.

[0052] When the foundry clay sand mixing device is working, the lifting belt conveyor 2 continuously inputs the foundry clay sand to be processed into the sand mixing box 6 of the sand mixer 1. In the above process, the driving motor 8 on the sand mixing box 6 drives the rotating shaft 7 to rotate through the transmission belt, and the rotating shaft 7 drives the material scraper 9, the push rod 10 and the rolling wheel 11 to rotate synchronously when the rotating shaft 7 rotates. The rolling wheel 11 will rotate on its own while revolving around the rotating shaft 7.

[0053] During the rotation of the rolling wheel 11, it will crush the foundry clay sand. When hard foreign objects (such as bolts and stones) are mixed into the sand mixing box 6, the hard foreign objects can squeeze the rolling ring 14, causing it to push the telescopic sleeve 19 to overcome the elastic force of the buffer spring 20 and move upward, thereby solving the problems of easy sticking and easy deformation when the existing rolling wheel 11 directly squeezes hard foreign objects.

[0054] During the rotation of the scraper 9 , the scraper 9 will scrape up the foundry clay sand from the bottom of the sand mixing box 6 , so that the scraper 9 finally enters the parabolic box 25 through the discharge port 12 under the push of the scraper 9 .

[0055] After the foundry clay sand enters the parabolic box 25, the rotating parabolic belt 29 throws the material out of the parabolic box 25 through the parabolic ridge 30. In this process, qualified foundry clay sand will be thrown into the distant screener 4 for screening due to its small particles and light weight. Unqualified materials will fall into the return belt 5, and then the return belt 5 can transport the unqualified materials to the lifting belt conveyor 2 to re-circulate.

[0056] After the foundry clay sand enters the screener 4, the rotating screening barrel 35 can screen the material again. In this process, the screening barrel 35 rotates in a high-speed and low-speed alternating manner. During the rotation of the screening barrel 35, qualified foundry clay sand will directly pass through the screening mesh on the screening barrel 35 and be discharged, and a small amount of unqualified foundry clay sand will be placed inside the screening barrel 35 and dispersed into qualified products by colliding with each other and colliding with the screening mesh under the action of centrifugal force and then output through the screening mesh. At this point, the foundry clay sand mixing device has completely completed the foundry clay sand mixing process.

[0057] In the above process, the purpose of rotating the screening barrel 35 in a high-speed and low-speed alternating manner is to make the centrifugal force on the material lower when the screening barrel 35 is running at a low speed, and the centrifugal force can only be concentrated in the lower half of the screening barrel 35; and when the material is running at a high speed, the centrifugal force on the material is higher, and the material will be attached to the inner surface of the screening barrel 35 under the action of the centrifugal force and have a tendency to run with it. In this way, when unqualified materials (materials with larger particle sizes) enter the screening barrel 35, due to the high-speed and low-speed alternating rotation of the screening barrel 35, the materials will alternately appear in the lower half of the screening barrel 35 and adhere to the inside of the screening barrel 35 inside the rotating screening barrel 35, so that the purpose of making the materials alternately collide with the screening mesh of the screening barrel 35 and finally dispersed into qualified materials under the action of the collision force.

[0058] The foundry clay sand mixing device has a compact structure and an ingenious design. It solves the problems of "easy deformation" and "low screening efficiency" existing in the existing foundry clay sand mixing machine through the rolling wheel 11 and the parabolic device 3, and is particularly suitable for use in foundry clay sand mixing.

Claims

1. A foundry clay sand mixing device, comprising a lifting belt conveyor (2), a sand mixer (1), a parabolic device (3) and a screener (4); characterized in that: A lifting belt conveyor (2) is arranged on one side of the sand mixer (1); a parabolic device (3) is arranged below the other side of the sand mixer (1); a sifter (4) is arranged on one side of the parabolic device (3); a material return belt (5) is arranged below the parabolic device (3); one end of the material return belt (5) is connected to the inlet of the lifting belt conveyor (2); The sand mixer (1) comprises a sand mixing box (6), a grinding wheel (11), a driving motor (8) and a material scraper (9); a rotating shaft (7) is arranged inside the sand mixing box (6); the lower end of the rotating shaft (7) extends to the lower part of the sand mixing box (6), and the bottom end of the sand mixing box (6) is equipped with a driving motor (8); the driving motor (8) is connected to the lower end of the rotating shaft (7) through a transmission belt; a material scraper (9) is arranged on the rotating shaft (7) inside the sand mixing box (6); pushing rods (10) are fixedly mounted on the rotating shaft (7) on both sides of the material scraper (9); a grinding wheel (11) is arranged at the end of the pushing rod (10); a material discharge port (12) is opened at the bottom of the sand mixing box (6); a parabolic device (3) is arranged on the sand mixing box (6) below the material discharge port (12); The rolling wheel (11) comprises a rolling ring (14), a sealing plate (15), a sealing ring (16), a sealer (17), an insert rod (18), a telescopic sleeve (19), a buffer spring (20) and a guide claw (21); a rolling ring (14) is arranged outside one end of the push rod (10); a sealing plate (15) is fixedly mounted on one end of the rolling ring (14); a sealing ring (16) is fixedly mounted on the other end of the rolling ring (14); the sealing ring (16) is connected to the push rod (10) through the sealer (17); an insert rod (18) is fixedly mounted on the push rod (10) inside the rolling ring (14); a telescopic sleeve (19) is inserted at the lower end of the insert rod (18); a buffer spring (20) is arranged between the inside of the telescopic sleeve (19) and the insert rod (18); guide claws (21) are fixedly mounted on both sides of the lower end of the telescopic sleeve (19); the guide claws (21) are slidably connected to the rolling ring (14); The sealer (17) comprises a sealing ring (22) and a sealing slip ring (23); the sealing ring (22) is fixedly mounted on one side of the sealing ring (16); a sealing ring groove (36) is provided on the inner wall of the sealing ring (22); the sealing slip ring (23) is fixedly mounted on the push rod (10) on the inner side of the sealing ring (16) plate; the sealing slip ring (23) maintains a sliding sealing connection with the sealing ring (22) via the sealing ring groove (36); Guide ring grooves (24) are symmetrically arranged on both sides of the inner wall of the rolling ring (14); the guide claws (21) are slidably connected to the guide ring grooves (24).

2. A foundry clay sand mixing device according to claim 1, characterized in that: The parabolic device (3) comprises a parabolic box (25), a driving wheel (27), a driven wheel (28) and a parabolic belt (29); the parabolic box (25) is arranged at the lower part of the sand mixing box (6) in an inclined shape; a feeding port (26) is arranged at the top of the parabolic box (25); the parabolic box (25) is connected to the sand mixing box (6) through the feeding port (26) and the feeding port (12); a parabolic belt (29) is arranged in the parabolic box (25) through the driving wheel (27) and the driven wheel (28); the parabolic belt (29) is arranged in an inclined shape; and a plurality of parabolic ridges (30) are evenly arranged on the surface of the parabolic belt (29).

3. A foundry clay sand mixing device according to claim 2, characterized in that: A tension wheel (31) is arranged between the driving wheel (27) and the driven wheel (28); the tension wheel (31) is connected to the inside of the parabolic belt (29) in a frictional manner; and an arc-shaped bottom plate (32) is arranged at the bottom of the parabolic box (25) below.

4. A foundry clay sand mixing device according to claim 2, characterized in that: The sifter (4) comprises a sifting frame (33), a sifting barrel (35) and a rotating shaft (34); the sifting barrel (35) is mounted on the sifting frame (33) via the rotating shaft (34); the sifting barrel (35) is arranged in an inclined state; sifting meshes are evenly distributed on the sifting barrel (35); a sifting motor (13) is mounted on the sifting frame (33); and the sifting motor (13) is connected to one end of the rotating shaft (34) via a transmission belt.

Images