CN214092911U

CN214092911U - Direction-changing driving device of woodworking band saw carriage

Info

Publication number: CN214092911U
Application number: CN202023037421.1U
Authority: CN
Inventors: 周海泉
Original assignee: Fujian Strength And Mechanical Co ltd
Current assignee: Fujian Strength And Mechanical Co ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-08-31
Anticipated expiration: 2030-12-16

Abstract

The utility model relates to a direction-changing driving device of a woodworking band sawing sports car, which comprises a frame, a transmission mechanism, a friction gear mechanism and a reversing clutch; the frame is provided with an output shaft, a first gear, a second gear, a reversing shaft and a reversing gear; the output shaft and the reversing shaft are respectively and rotationally fixed on the frame; the first gear and the second gear are respectively fixed on the output shaft; the reversing gear is fixed on the reversing shaft and meshed with the first gear; the transmission mechanism comprises a transmission main shaft and a belt pulley; the transmission main shaft, the reversing shaft and the output shaft are arranged in parallel; the two friction gear mechanisms are sleeved on the transmission main shaft and are respectively arranged on two sides of the belt pulley; the friction gear mechanism is provided with a transmission gear, and the two transmission gears are respectively meshed with the second gear and the reversing gear; the two reversing clutches are movably sleeved outside the transmission main shaft and are respectively movably connected with the outer side of a friction gear mechanism; operation of the reversing clutch brings a friction gear mechanism into contact with the pulley.

Description

Direction-changing driving device of woodworking band saw carriage

Technical Field

The utility model relates to a diversion drive arrangement of carpenter's band saw sports car belongs to wood working machinery technical field.

Background

The band saw sports car is driven by a belt wheel to rotate and a steel wire rope wound on the belt wheel pulls the band saw sports car to move. In the prior art, a band sawing sports car for woodwork is characterized in that three rollers are arranged on a rack side by side in a back-and-forth movement mode; the front and the rear are driven cylinders with plastic materials on the outer layers; the middle roller is a driving wheel with power and is provided with an operating lever connected with the operating platform; the operating rod moves back and forth to be contacted with the front and rear rollers respectively, the two driven wheels are driven by the friction force of the tangent line between the rollers, and the four-stage gear and the chain wheel are used for transmission, so that the woodworking band saw sports car is driven to move back and forth.

Chinese utility model patent 'transmission of carpenter band saw machine sports car with an authority bulletin number CN 202690943U', it includes input wheel assembly (1), preceding idle wheel (2), back idle wheel (3) and output shaft (4), input wheel assembly (1) comprises coaxial fixed input band pulley (5) and friction wheel (6), input wheel assembly (1) is fixed between preceding idle wheel (2) and back idle wheel (3) through pendulum rod (7) that articulates on the frame, preceding idle wheel (2) and back idle wheel (3) are connected with output shaft (4) through sprocket (8) and gear train (9) respectively, be equipped with reel (10) on output shaft (4), reel (10) are when rotatory, can drive the sports car through the wire rope of fixing at the sports car track both ends around its both ends a plurality of circles. The novel hydraulic drive device has the advantages of simple structure, low manufacturing cost and reliable drive, can avoid the occurrence of a slipping phenomenon, improves the working efficiency and reduces the maintenance cost.

The transmission device in the band saw sports car needs one driving wheel, two driven wheels and a gear for output, and the transmission of four stages can realize the conversion of the rotation direction of the belt wheel through a steering mechanism, so that the band saw sports car advances or retreats, and the band saw sports car has multiple stages, low efficiency and inconvenient operation.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problem, the utility model provides a turning drive arrangement of carpenter's band saw sports car, this turning drive arrangement simple structure has reduced the transmission level difference, reduces to the second grade from the level four, can improve the work efficiency, reduces the energy consumption.

The technical scheme of the utility model as follows:

a turning driving device of a woodworking band saw carriage comprises a frame, a transmission mechanism, a friction gear mechanism and a reversing clutch; the rack is provided with an output shaft, a first gear, a second gear, a reversing shaft and a reversing gear; the output shaft and the reversing shaft are respectively and rotationally fixed on the rack; the first gear and the second gear are respectively fixed on the output shaft and are positioned in the rack; the reversing gear is fixed on the reversing shaft and meshed with the first gear; the transmission mechanism comprises a transmission main shaft fixed on the rack and a belt pulley rotationally fixed in the middle of the transmission main shaft; the transmission main shaft, the reversing shaft and the output shaft are arranged in parallel; the two friction gear mechanisms are movably sleeved on the transmission main shaft and are respectively arranged on two sides of the belt pulley; a gap is reserved between the friction gear mechanism and the belt pulley; the friction gear mechanism is provided with transmission gears, and the two transmission gears are respectively meshed with the second gear and the reversing gear; the two reversing clutches are movably sleeved outside the transmission main shaft and are respectively movably connected with the outer side of one friction gear mechanism; operation of the reversing clutch brings a friction gear mechanism into contact with the pulley.

Furthermore, the reversing clutch comprises a fixed seat and a clutch disc; the fixed seat is fixed on the frame; two ends of the transmission main shaft are respectively fixed on the fixed seat; the clutch disc is movably sleeved outside the transmission main shaft; the clutch disc is movably connected with the friction gear mechanism; the clutch disc can axially slide along the transmission main shaft and can also rotate around the transmission main shaft; a plurality of fixed wedges are uniformly fixed on the end surface of one side, close to the belt pulley, of the fixed seat at intervals, and clutch wedges matched with the fixed wedges are fixed on the end surface of one side, close to the fixed seat, of the clutch disc; the wedge-shaped surface of the fixed wedge block is attached to the wedge-shaped surface of the clutch wedge block, so that the distance between the fixed seat and the clutch disc can be adjusted.

Furthermore, the friction gear mechanism is horizontally hollow and comprises a friction plate, a fixing plate, a bottom plate, an outer sleeve and the transmission gear which are coaxially fixed in sequence; the outer sleeve and the transmission gear are movably sleeved outside the transmission main shaft; the friction plate is arranged close to the belt pulley; the transmission gear and the clutch disc are rotationally fixed; the clutch plate is operated to bring a friction plate of a friction gear mechanism into contact with the pulley.

Furthermore, the reversing clutch also comprises a clutch pull rod and a clutch cross rod; one end of the clutch pull rod is fixed with one clutch disc, and the other end of the clutch pull rod is fixed with one end of the clutch cross rod horizontally.

Furthermore, the device also comprises a seat thrust ball bearing and a cylindrical roller bearing; a baffle ring is fixed in the middle of the inner periphery of the outer sleeve, the seat thrust ball bearing and the cylindrical roller bearing are respectively arranged on two sides of the baffle ring, and the seat thrust ball bearing is arranged close to the belt pulley; a shaft ring of the seat thrust ball bearing is movably sleeved outside the transmission main shaft, and a seat ring is fixed with the inner periphery of the outer sleeve; the inner ring of the cylindrical roller bearing is fixed outside the transmission main shaft, and the outer ring of the cylindrical roller bearing is fixed with the inner periphery of the outer sleeve.

Further, the device also comprises a release bearing; the separation bearing is movably sleeved outside the transmission main shaft; the race of the release bearing is fixed with the transmission gear, and the shaft ring is fixed with the clutch disc.

Further, the device also comprises a deep groove ball bearing and a ball bearing with a thrust force; the middle part of the inner periphery of the belt pulley is provided with an annular baffle; the two ball bearings with thrust are respectively arranged on two sides of the baffle plate; the two deep groove ball bearings are respectively arranged at the outer sides of the two ball bearings with thrust force; the race with the thrust ball bearing is fixed with the inner periphery of the belt pulley, and the shaft ring is fixed with the transmission main shaft; the inner ring of the deep groove ball bearing is fixed with the transmission main shaft, and the outer ring of the deep groove ball bearing is fixed with the inner periphery of the belt pulley.

Further, the device also comprises a spring; a flange is coaxially fixed on the periphery of the transmission main shaft at two sides of the belt pulley respectively; the spring is movably sleeved outside the transmission main shaft; one end of the spring is abutted against the outer side end face of the flange, and the other end of the spring is abutted against the outer side of the seat ring of the seat thrust ball bearing.

Further, the device also comprises a spacer bush; the spacer bush is fixed outside the transmission main shaft and positioned between the belt pulley and the cylindrical roller bearing; a shaft ring of the thrust ball bearing is movably sleeved outside the spacer sleeve; and the tail end of the spacer bush is abutted and contacted with the inner ring of the cylindrical roller bearing.

Furthermore, one end of the output shaft penetrates out of the rack, and an output chain wheel is fixed at the tail end of the output shaft.

The utility model discloses following beneficial effect has:

1. the direction-changing driving device is simple in structure, reduces the transmission level difference from four levels to two levels, can improve the work efficiency and reduce the energy consumption.

2. The direction-changing driving device can make the transmission process more stable and reduce the labor intensity of operators; meanwhile, the volume is small, raw materials are saved, the product cost is reduced, the internal space is expanded, and the cleaning and the maintenance are convenient.

3. Through the cooperation of the wedge-shaped surface of the fixed wedge and the wedge-shaped surface of the clutch wedge, the friction gear mechanism on one side can be finally driven to be in contact with the belt pulley, so that the woodworking band saw carriage is driven to move forward or backward, and the woodworking band saw carriage is stable and reliable.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a partially enlarged view of a portion a of fig. 2.

Fig. 4 is an internal structure view of the present invention.

Fig. 5 is a partial enlarged view of fig. 4 at B.

Fig. 6 is a partially enlarged view of fig. 4 at C.

Fig. 7 is a schematic structural diagram of the reversing clutch.

Fig. 8 is a schematic view of the internal structure of the outer sleeve.

The reference numbers in the figures denote:

1. a frame; 11. an output shaft; 12. a first gear; 13. a second gear; 14. an output sprocket; 15. a reversing shaft; 16. a reversing gear; 2. a transmission mechanism; 21. a belt pulley; 22. a transmission main shaft; 23. a flange; 24. a baffle plate; 3. a friction gear mechanism; 31. a friction plate; 32. a fixing sheet; 33. a base plate; 34. an outer sleeve; 35. a transmission gear; 36. a baffle ring; 37. a spring; 4. a reversing clutch; 41. a fixed seat; 42. fixing the wedge block; 43. a clutch plate; 44. a clutch wedge; 45. a clutch pull rod; 46. a clutch cross bar; 51. a deep groove ball bearing; 52. a ball bearing with thrust; 53. a seat thrust ball bearing; 54. a cylindrical roller bearing; 55. separating the bearing; 56. and (4) a spacer bush.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Wherein, the model of the deep groove ball bearing 51 is 6207-2 RS; 51207 is selected for the thrust ball bearing 52 with a thrust ball bearing seat 53; the model of the cylindrical roller bearing 54 is NU 206; the release bearing 55 is 588909.

Referring to fig. 1-8, a direction-changing driving device of a woodworking band-sawing sports car comprises a frame 1, a transmission mechanism 2, a friction gear mechanism 3 and a reversing clutch 4; the frame 1 is provided with an output shaft 11, a first gear 12, a second gear 13, a reversing shaft 15 and a reversing gear 16; the output shaft 11 and the reversing shaft 15 are respectively and rotationally fixed on the frame 1; the first gear 12 and the second gear 13 are respectively fixed on the output shaft 11 and are positioned in the frame 1; the reversing gear 16 is fixed on the reversing shaft 15, and the reversing gear 16 is meshed with the first gear 12; the transmission mechanism 2 comprises a transmission main shaft 22 fixed on the frame 1 and a belt pulley 21 rotationally fixed in the middle of the transmission main shaft 22; the transmission main shaft 22, the reversing shaft 15 and the output shaft 11 are arranged in parallel; the two friction gear mechanisms 3 are movably sleeved on the transmission main shaft 22 and are respectively arranged on two sides of the belt pulley 21; a gap is reserved between the friction gear mechanism 3 and the belt pulley 21; the friction gear mechanism 3 is provided with transmission gears 35, and the two transmission gears 35 are respectively meshed with the second gear 13 and the reversing gear 16; the two reversing clutches 4 are movably sleeved outside the transmission main shaft 22 and are respectively movably connected with the outer side of one friction gear mechanism 3; operation of the changeover clutch 4 brings a friction gear mechanism 3 into contact with the pulley 21.

According to the description, the direction-changing driving device of the woodworking band sawing sports car comprises a frame 1, a transmission mechanism 2, a friction gear mechanism 3 and a reversing clutch 4. The frame 1 plays a role in fixing and supporting the whole body; the transmission mechanism 2 is provided with a belt pulley 21 and a transmission main shaft 22 which are input ends of power; the friction gear mechanism 3 is disposed on both sides of the belt pulley 21, and can be in contact with the belt pulley 21 through the reversing clutch 4, and is driven by the belt pulley 21 to rotate. The frame 1 is provided with an output shaft 11, a first gear 12, a second gear 13, a reversing shaft 15 and a reversing gear 16. The reversing shaft 15 is arranged on the frame 1, and a reversing gear 16 is fixed on the reversing shaft 15; the output shaft 11 is used as power output, and a first gear 12 and a second gear 13 are respectively fixed on the output shaft; at the same time, the reversing gear 16 meshes with the first gear 12. A transmission gear 35 is fixed on the friction gear mechanism 3, and the two transmission gears 35 are respectively meshed with the reversing gear 16 and the second gear 13.

When the wood band saw carriage is used, the reversing clutch 4 is rotated forwards, the reversing clutch 4 drives the friction gear mechanism 3 positioned on the left side to be in contact with the end face of the belt pulley 21, the belt pulley 21 rotating at a high speed can simultaneously drive the friction gear mechanism 3 to rotate, then the output shaft 11 is driven to rotate through the meshing action among the transmission gear 35, the reversing gear 16 and the first gear 12, and the wood band saw carriage is driven to move forwards through the transmission of the output chain wheel 14 and the chain; and the right friction gear mechanism 3 follows the rotation only through the meshing action between the second gear 13 and the transmission gear 35 on the second gear. The reversing clutch 4 is rotated reversely, the reversing clutch 4 drives the friction gear mechanism 3 positioned on the right side to contact with the end face of the belt pulley 21, the belt pulley 21 rotating at high speed can simultaneously drive the friction gear mechanism 3 to rotate, then the output shaft 11 is driven to rotate through the meshing action between the transmission gear 35 and the second gear 13, and the woodworking band saw roadster is driven to retreat through the transmission of the output chain wheel 14 and the chain; and the friction gear mechanism 3 on the left passively follows the rotation only through the meshing action among the transmission gear 35, the reversing gear 16 and the first gear 12.

In particular, the transmission main shaft 22 is fixed on the frame 1 and can neither axially translate nor rotate; the belt pulley 21 is rotationally fixed with the transmission main shaft 22, only rotates around the transmission main shaft 22, and cannot axially translate; the friction gear mechanism 3 is movably sleeved on the outer side of the transmission main shaft 22 and can perform axial translation and also rotate around the transmission main shaft 22; the reversing clutch 4 is movably sleeved on the outer side of the transmission main shaft 22, can perform axial translation, and can also rotate around the transmission main shaft 22.

Further, the reversing clutch 4 comprises a fixed seat 41 and a clutch disc 43; the fixed seat 41 is fixed on the frame 1; two ends of the transmission main shaft 22 are respectively fixed on the fixed seat 41; the clutch disc 43 is movably sleeved outside the transmission main shaft 22; the clutch disc 43 is movably connected with the friction gear mechanism 3; the clutch disc 43 can slide along the axial direction of the transmission main shaft 22 and can rotate around the transmission main shaft 22; a plurality of fixed wedges 42 are uniformly fixed on the end surface of the fixed seat 41 close to one side of the belt pulley 21 at intervals, and clutch wedges 44 matched with the fixed wedges 42 are fixed on the end surface of the clutch disc 43 close to one side of the fixed seat 41; the wedge-shaped surface of the fixed wedge 42 is attached to the wedge-shaped surface of the clutch wedge 44, so that the distance between the fixed seat 41 and the clutch disc 43 can be adjusted.

According to the above description, the reversing clutch 4 comprises a fixed seat 41 and a clutch disc 43. The fixing seat 41 is fixed on the frame 1, and the transmission main shaft 22 is fixed on the fixing seat 41, so that the transmission main shaft 22 cannot perform axial translation or rotation; the clutch disc 43 is movably sleeved on the transmission main shaft 22, and meanwhile, the clutch disc 43 is movably connected with the friction gear mechanism 3. In addition, the clutch disc 43 can slide along the axial direction of the transmission main shaft 22 and can also rotate around the transmission main shaft 22; the distance between the fixed seat 41 and the clutch disc 43 is adjusted by the wedge-shaped surfaces of the fixed wedge 42 and the clutch wedge 44. Through the cooperation of the wedge-shaped surface of the fixed wedge 42 and the wedge-shaped surface of the clutch wedge 44, the friction gear mechanism 3 on one side can be finally driven to contact with the belt pulley 21, and the woodworking band saw carriage is driven to move forward or backward.

Further, the friction gear mechanism 3 is horizontally hollow and comprises a friction plate 31, a fixing plate 32, a bottom plate 33, an outer sleeve 34 and the transmission gear 35 which are coaxially fixed in sequence; the outer sleeve 34 and the transmission gear 35 are movably sleeved outside the transmission main shaft 22; the friction plate 31 is arranged close to the belt pulley 21; the transmission gear 35 and the clutch disc 43 are fixed in rotation; the clutch plate 43 is operated to bring the friction plate 31 of a friction gear mechanism 3 into contact with the pulley 21.

According to the above description, the friction gear mechanism 3 includes the friction plate 31, the fixing plate 32, the bottom plate 33, the outer sleeve 34, and the transmission gear 35; the friction plate 31 can directly contact with the belt pulley 21 to drive the friction gear mechanism 3 to rotate; the fixing piece 32 and the bottom plate 33 play a role in supporting and fixing; the outer sleeve 34 and the transmission gear 35 are arranged outside the transmission main shaft 22 and play a role of rotation.

Specifically, the friction plate 31 is made of rubber.

Further, the reversing clutch 4 further comprises a clutch pull rod 45 and a clutch cross rod 46; one end of the clutch pull rod 45 is fixed to one of the clutch discs 43, and the other end of the clutch pull rod 45 is fixed to one end of the clutch cross rod 46. The reversing clutch 4 can be operated more easily by means of the clutch lever 45 and the clutch cross bar 46.

Further, a seat thrust ball bearing 53 and a cylindrical roller bearing 54 are included; a retaining ring 36 is fixed in the middle of the inner periphery of the outer sleeve 34, the thrust ball bearing 53 and the cylindrical roller bearing 54 are respectively arranged on two sides of the retaining ring 36, and the thrust ball bearing 53 is arranged close to the belt pulley 21; the shaft ring of the seat thrust ball bearing 53 is movably sleeved outside the transmission main shaft 22, and the seat ring is fixed with the inner periphery of the outer sleeve 34; the inner ring of the cylindrical roller bearing 54 is fixed outside the transmission main shaft 22, and the outer ring is fixed with the inner periphery of the outer sleeve 34.

Further, a release bearing 55 is included; the release bearing 55 is movably sleeved outside the transmission main shaft 22; the race of the release bearing 55 is fixed to the transmission gear 35, and the race is fixed to the clutch plate 43.

Further, the device also comprises a deep groove ball bearing 51 and a ball bearing 52 with thrust; the middle part of the inner periphery of the belt pulley 21 is provided with an annular baffle 24; the two ball bearings 52 with thrust are respectively arranged on two sides of the baffle plate 24; the two deep groove ball bearings 51 are respectively arranged at the outer sides of the two ball bearings with thrust 52; the race with the thrust ball bearing 52 is fixed with the inner periphery of the belt pulley 21, and the shaft ring is fixed with the transmission main shaft 22; the inner ring of the deep groove ball bearing 51 is fixed with the transmission main shaft 22, and the outer ring is fixed with the inner periphery of the belt pulley 21.

Further, a spring 37 is also included; a flange 23 is coaxially fixed on the periphery of the transmission main shaft 22 at two sides of the belt pulley 21 respectively; the spring 37 is movably sleeved outside the transmission main shaft 22; one end of the spring 37 abuts against the outer end face of the flange 23, and the other end abuts against the outer side of the race of the seat thrust ball bearing 53. The spring 37 is mainly used to provide an elastic force to ensure that the friction gear mechanism 3 can be surely disengaged from the pulley 21 after the reversing clutch 4 is reset.

In particular, one of the two flanges 23 may be integral with the drive shaft 22, while the other flange 23 is a nut that is screwed onto the drive shaft 22.

Further, a spacer 56 is also included; the spacer 56 is fixed outside the transmission main shaft 22 and is positioned between the belt pulley 21 and the cylindrical roller bearing 54; the shaft ring of the seat thrust ball bearing 53 is movably sleeved outside the spacer 56; the end of the spacer 56 is in abutting contact with the inner race of the cylindrical roller bearing 54. The spacer 56 is mainly used for abutting against the inner ring of the cylindrical roller bearing 54, and preventing the inner ring of the cylindrical roller bearing 54 from moving and losing position along with the friction gear mechanism 3 in the process that the clutch disc 43 pushes the friction gear mechanism 3 to perform axial translation.

Furthermore, one end of the output shaft 11 penetrates through the frame 1, and the tail end is fixed with an output chain wheel 14.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides a diversion drive arrangement of carpenter's band saw sports car which characterized in that: comprises a frame (1), a transmission mechanism (2), a friction gear mechanism (3) and a reversing clutch (4); an output shaft (11), a first gear (12), a second gear (13), a reversing shaft (15) and a reversing gear (16) are arranged on the rack (1); the output shaft (11) and the reversing shaft (15) are respectively and rotatably fixed on the rack (1); the first gear (12) and the second gear (13) are respectively fixed on the output shaft (11) and are positioned in the rack (1); the reversing gear (16) is fixed on the reversing shaft (15), and the reversing gear (16) is meshed with the first gear (12); the transmission mechanism (2) comprises a transmission main shaft (22) fixed on the rack (1) and a belt pulley (21) rotationally fixed in the middle of the transmission main shaft (22); the transmission main shaft (22) and the reversing shaft (15) are arranged in parallel with the output shaft (11); the two friction gear mechanisms (3) are movably sleeved on the transmission main shaft (22) and are respectively arranged on two sides of the belt pulley (21); a gap is reserved between the friction gear mechanism (3) and the belt pulley (21); the friction gear mechanism (3) is provided with transmission gears (35), and the two transmission gears (35) are respectively meshed with the second gear (13) and the reversing gear (16); the two reversing clutches (4) are movably sleeved outside the transmission main shaft (22) and are respectively movably connected with the outer side of one friction gear mechanism (3); the reversing clutch (4) is operated to bring a friction gear mechanism (3) into contact with the pulley (21).

2. The direction-changing driving device of the woodworking band sawing sports car according to claim 1, characterized in that: the reversing clutch (4) comprises a fixed seat (41) and a clutch disc (43); the fixed seat (41) is fixed on the rack (1); two ends of the transmission main shaft (22) are respectively fixed on the fixed seat (41); the clutch disc (43) is movably sleeved outside the transmission main shaft (22); the clutch disc (43) is movably connected with the friction gear mechanism (3); the clutch disc (43) can slide along the axial direction of the transmission main shaft (22) and can also rotate around the transmission main shaft (22); a plurality of fixed wedges (42) are uniformly fixed on the end surface of one side, close to the belt pulley (21), of the fixed seat (41) at intervals, and clutch wedges (44) matched with the fixed wedges (42) are fixed on the end surface of one side, close to the fixed seat (41), of the clutch disc (43); the wedge-shaped surface of fixed voussoir (42) with the wedge-shaped surface of clutch voussoir (44) laminates each other, can adjust fixing base (41) with interval between clutch disc (43).

3. The direction-changing driving device of the woodworking band sawing sports car as claimed in claim 2, wherein: the friction gear mechanism (3) is horizontal and hollow and comprises a friction plate (31), a fixing plate (32), a bottom plate (33), an outer sleeve (34) and the transmission gear (35) which are coaxially fixed in sequence; the outer sleeve (34) and the transmission gear (35) are movably sleeved outside the transmission main shaft (22); the friction plate (31) is arranged close to the belt pulley (21); the transmission gear (35) and the clutch disc (43) are rotationally fixed; the clutch plate (43) is operated to bring a friction plate (31) of a friction gear mechanism (3) into contact with the pulley (21).

4. The direction-changing driving device of the woodworking band sawing sports car as claimed in claim 2, wherein: the reversing clutch (4) also comprises a clutch pull rod (45) and a clutch cross rod (46); one end of the clutch pull rod (45) is fixed with one clutch disc (43) respectively, and the other end of the clutch pull rod (45) is fixed with one end of the clutch cross rod (46) horizontally.

5. The direction-changing driving device of the woodworking band sawing sports car as claimed in claim 3, wherein: the device also comprises a seat thrust ball bearing (53) and a cylindrical roller bearing (54); a retaining ring (36) is fixed in the middle of the inner periphery of the outer sleeve (34), the seat thrust ball bearing (53) and the cylindrical roller bearing (54) are respectively arranged on two sides of the retaining ring (36), and the seat thrust ball bearing (53) is arranged close to the belt pulley (21); a shaft ring of the seat thrust ball bearing (53) is movably sleeved outside the transmission main shaft (22), and a seat ring is fixed with the inner periphery of the outer sleeve (34); the inner ring of the cylindrical roller bearing (54) is fixed outside the transmission main shaft (22), and the outer ring of the cylindrical roller bearing is fixed with the inner periphery of the outer sleeve (34).

6. The direction-changing driving device of the woodworking band sawing sports car as claimed in claim 3, wherein: further comprising a release bearing (55); the release bearing (55) is movably sleeved outside the transmission main shaft (22); the race of the release bearing (55) is fixed with the transmission gear (35), and the shaft ring is fixed with the clutch disc (43).

7. The direction-changing driving device of the woodworking band sawing sports car as claimed in claim 3, wherein: the device also comprises a deep groove ball bearing (51) and a ball bearing (52) with thrust; the middle part of the inner periphery of the belt pulley (21) is provided with an annular baffle plate (24); the two ball bearings (52) with thrust are respectively arranged on two sides of the baffle plate (24); the two deep groove ball bearings (51) are respectively arranged at the outer sides of the two ball bearings (52) with thrust; the race with the thrust ball bearing (52) is fixed with the inner periphery of the belt pulley (21), and the shaft ring is fixed with the transmission main shaft (22); the inner ring of the deep groove ball bearing (51) is fixed with the transmission main shaft (22), and the outer ring of the deep groove ball bearing is fixed with the inner periphery of the belt pulley (21).

8. The direction-changing driving device of the woodworking band sawing sports car according to claim 5, characterized in that: further comprising a spring (37); the periphery of the transmission main shaft (22) is positioned at two sides of the belt pulley (21) and is respectively and coaxially fixed with a flange (23); the spring (37) is movably sleeved outside the transmission main shaft (22); one end of the spring (37) is abutted against the outer end face of the flange (23), and the other end of the spring is abutted against the outer side of the seat ring of the seat thrust ball bearing (53).

9. The direction-changing driving device of the woodworking band sawing sports car according to claim 5, characterized in that: also comprises a spacer bush (56); the spacer bush (56) is fixed outside the transmission main shaft (22) and is positioned between the belt pulley (21) and the cylindrical roller bearing (54); a shaft ring of the thrust ball bearing (53) is movably sleeved outside the spacer bush (56); the end of the spacer (56) is in abutting contact with the inner ring of the cylindrical roller bearing (54).

10. The direction-changing driving device of the woodworking band sawing sports car according to claim 1, characterized in that: one end of the output shaft (11) penetrates out of the rack (1), and an output chain wheel (14) is fixed at the tail end.