Stacking equipment for automobile part packaging boxes

Abstract

The stacking equipment comprises a conveying frame, a base and a set of supporting columns, a queuing mechanism and a carrying mechanism are arranged at the tops of the set of supporting columns, a tilting mechanism is arranged in the conveying frame, a stacking mechanism is arranged at the top of the base, and the queuing mechanism is an oval rail; a plurality of fixing frames are fixedly connected between the inner wall of the oval track and the set of supporting columns, and a first T-shaped sliding groove is formed in the bottom of the oval track. Through the arranged queuing mechanism, a second driving motor works to enable a chain plate to rotate in an elliptical track under the meshing action of the chain plate and a spur gear, a group of supporting plates and clamping plates are driven to lift and move color printing packaging boxes to be stacked, and the color printing packaging boxes can be queued and waited in the elliptical track by using a plurality of groups of supporting plates and clamping plates; different operation time caused by different stacking distances during stacking of the device is avoided, conveying difficulty caused by constant-speed conveying of the conveying frame is avoided, and the device is prevented from being frequently started and stopped to influence the service life of the machine.

Description

Technical Field

[0001] The invention relates to the technical field of palletizing equipment, and in particular to a palletizing equipment for automobile parts packaging boxes. Background Art

[0002] After the auto parts are packaged, their packaging boxes need to be palletized, that is, they need to be arranged on pallets and trays in a certain manner and automatically stacked into multiple layers to facilitate the transportation of the stacked auto parts.

[0003] The existing palletizers are all used in conjunction with conveyors to form a palletizing production line for automatic box delivery and stacking. However, the conveyor conveys the boxes at a uniform speed, with the previous box close to the next box. During palletizing, due to the different palletizing distances, the single operation time of the robot arm is different. The stacking speed of the palletizer cannot keep up with the rotating motion of the conveyor belt, causing the conveyor belt to frequently stop and wait. Frequent start and stop times can easily affect the life of the machine. Therefore, there is an urgent need for a palletizing device for auto parts boxes to solve this problem. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a palletizing device for automobile parts packaging boxes.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A palletizing device for automobile parts packaging boxes comprises a conveyor frame, a base and a group of pillars, a queuing mechanism and a handling mechanism are arranged on the top of the group of pillars, a tilting mechanism is arranged inside the conveyor frame, a palletizing mechanism is arranged on the top of the base, the queuing mechanism is an elliptical track, a plurality of fixing frames are fixedly connected between the inner wall of the elliptical track and the group of pillars, a first T-shaped slide groove is provided at the bottom of the elliptical track, a chain plate is rotatably connected inside the first T-shaped slide groove, a first hydraulic cylinder is fixedly connected to the bottom of the chain plate, a cross bar is fixedly connected to the bottom end of the first hydraulic cylinder, and a group of supporting plates are fixedly connected to the outer wall of the cross bar.

[0006] Preferably, the outer wall of the first hydraulic cylinder is rotatably connected to the first bidirectional threaded rod, the outer walls at both ends of the first bidirectional threaded rod are threadedly connected to clamps, one end of the first bidirectional threaded rod is fixedly connected to the first drive motor, and one side of a group of clamps is fixedly connected to the two ends of the cross bar with telescopic rods.

[0007] Preferably, a group of pillar outer walls are fixedly connected to a first fixed plate, a second drive motor is arranged on the top of the first fixed plate, the output shaft of the second drive motor is poweredly connected to a spur gear, teeth are evenly arranged on the inner side of the chain plate, grooves are opened on the inner sides of both ends of the elliptical track, a group of spur gears extend outwardly into the inner walls of the grooves and respectively mesh with a plurality of teeth, and balls are evenly arranged between the inner wall of the bottom of the elliptical track and the chain plate.

[0008] Preferably, the transport mechanism is an adsorption frame, a top plate is fixedly connected to one side of the elliptical track, and the two ends of the other side of the top plate are respectively fixedly connected to the top of the base with inclined frames, a group of second hydraulic cylinders are fixedly connected to the bottom of the top plate, and the bottom ends of a group of second hydraulic cylinders are fixedly connected to the same moving plate, and a third drive motor is arranged at the bottom of the moving plate, and the output shaft of the third drive motor is power-connected to a rotating shaft, and the other end of the rotating shaft is fixedly connected to a hydraulic rod, and the other end of the hydraulic rod is fixedly connected to the adsorption frame.

[0009] Preferably, a plurality of suction cups are evenly arranged on the surface of the adsorption rack, and an air pump is arranged on one side of the adsorption rack.

[0010] Preferably, a base frame is provided at the bottom of the conveying frame, one of the base frames is fixedly connected to the base, a plurality of conveying rollers are evenly arranged inside the conveying frame, and a controller is provided on one side of the conveying frame.

[0011] Preferably, the tilting mechanism is a group of inclined plates, a second two-way threaded rod is rotatably connected to the inner side of the conveying frame, the outer walls at both ends of the second two-way threaded rod are threadedly connected to a group of inclined plates, the front side of a group of inclined plates is consistent with the height of multiple conveying rollers, one end of the second two-way threaded rod extends out of the conveying frame and is fixedly connected to a turning handle, a second T-shaped slide groove is opened on the inner wall of the conveying frame, a sliding rod is fixedly connected inside the second T-shaped slide groove, a sliding block is slidably connected to the outer wall of the sliding rod, a second fixed plate is fixedly connected to the front side of a group of inclined plates, and guide plates are rotatably connected between a group of sliding blocks and a group of second fixed plates.

[0012] Preferably, a group of sliders are respectively slidably connected to a group of second T-shaped slots, and return springs are arranged between the two sides of the sliders and the inner walls of the two sides of the second T-shaped slots.

[0013] Preferably, the stacking mechanism is an L-shaped plate, a vibrating plate is arranged on the top of the base, a vibrating motor is arranged inside the vibrating plate, the vibrating plate is rotatably connected to the L-shaped plate, a third T-shaped slot is opened on the top of the L-shaped plate, a third bidirectional threaded rod is rotatably connected to the inner wall of one side of the third T-shaped slot, threaded sleeves are threadedly connected to the outer walls of both ends of the third bidirectional threaded rod, a group of threaded sleeves are respectively fixedly connected to the top of the side plates, a supporting frame is arranged on the top of the L-shaped plate, a plurality of elastic rods are evenly arranged on the inner side of a group of side plates, and the other sides of the plurality of elastic rods are fixedly connected to the same inner plate.

[0014] Preferably, a group of threaded sleeves are slidably connected to the third T-shaped slot, the other end of the third bidirectional threaded rod extends out of the outside of the L-shaped disk and is fixedly connected to the fourth drive motor, and the inner sides of a group of side plates are naturally in contact with both sides of the support bracket.

[0015] The beneficial effects of the present invention are: 1. Through the queuing mechanism, the second drive motor works to make the chain plate rotate in the elliptical track under the meshing action with the spur gear, driving a group of pallets and clamping plates to lift and move the color-printed packaging boxes to be stacked. Multiple groups of pallets and clamping plates can be used to queue the color-printed packaging boxes in the elliptical track to avoid the different operation times caused by different stacking distances during stacking, but the conveying of the conveyor frame at a uniform speed. It also prevents the frequent start and stop time of the device from affecting the machine life; 2. Through the transport mechanism, the air pump works to make the suction cup absorb and transport the color printing packaging box to be moved. Compared with the plywood, the mechanical force reduces the damage to the outer wall of the color printing packaging box, and the transportation is more stable; 3. Through the tilting mechanism, the second bidirectional threaded rod is rotated by turning the handle, so that a group of inclined plates are moved closer or farther away from each other, so that the device can be adjusted according to the size of the color-printed packaging boxes to be stacked. At the same time, a group of guide plates can automatically adjust the tilt angle according to the position of a group of inclined plates, so that the conveyed color-printed packaging boxes are automatically centered, which is convenient for the pallet and the clamping plate to grab; 4. Through the stacking mechanism, the color-printed packaging boxes between a group of side plates are vibrated by using a vibration plate, and the inside is kept tight by using elastic rods and inner plates, so that multiple color-printed packaging boxes are more closely fitted and connected, and more stable in subsequent transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a palletizing device for automobile parts packaging boxes proposed by the present invention; Figure 2 A partial bottom view structural schematic diagram of a palletizing device for automobile parts packaging boxes proposed by the present invention; Figure 3 A schematic diagram of the structure of a queuing mechanism for a palletizing device for automobile parts packaging boxes proposed by the present invention; Figure 4 A schematic diagram of a partial three-dimensional structure of a palletizing device for automobile parts packaging boxes proposed by the present invention; Figure 5 A schematic diagram of the structure of a transport mechanism of a palletizing device for automobile parts packaging boxes proposed by the present invention; Figure 6 A partial structural schematic diagram of a palletizing device for automobile parts packaging boxes proposed by the present invention; Figure 7 This is a schematic diagram of the structure of a tilting mechanism of a palletizing device for automobile parts packaging boxes proposed by the present invention; Figure 8 The present invention provides a schematic diagram of the structure of a palletizing mechanism for palletizing equipment used for packaging boxes of automobile parts.

[0017] In the attached figure: 1, conveyor frame; 2, base; 3, support; 4, fixed frame; 5, elliptical track; 6, first T-shaped slide; 7, chain plate; 8, first hydraulic cylinder; 9, cross bar; 10, support plate; 11, first bidirectional threaded rod; 12, clamping plate; 13, first drive motor; 14, telescopic rod; 15, first fixed plate; 16, second drive motor; 17, spur gear; 18, teeth; 19, groove; 20, ball; 21, top plate; 22, inclined frame; 23, second hydraulic cylinder; 24, moving plate; 25, third drive motor; 26, rotating shaft ; 27. Hydraulic rod; 28. Adsorption frame; 29. ​​Suction cup; 30. Air pump; 31. Base frame; 32. Conveyor roller; 33. Second bidirectional threaded rod; 34. Inclined plate; 35. Turning handle; 36. Second T-shaped slide; 37. Slide bar; 38. Sliding block; 39. Guide plate; 40. Second fixed plate; 41. Return spring; 42. Vibrating plate; 43. L-shaped plate; 44. Third T-shaped slide; 45. Third bidirectional threaded rod; 46. Threaded sleeve; 47. Side plate; 48. Fourth drive motor; 49. Support frame; 50. Elastic rod; 51. Inner plate. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0019] Reference Figure 1-8 A palletizing device for automobile parts packaging boxes comprises a conveyor frame 1, a base 2 and a group of pillars 3, a queuing mechanism and a handling mechanism are arranged on the top of the group of pillars 3, a tilting mechanism is arranged inside the conveyor frame 1, a palletizing mechanism is arranged on the top of the base 2, the queuing mechanism is an elliptical track 5, a plurality of fixed frames 4 are fixedly connected between the inner wall of the elliptical track 5 and the group of pillars 3, a first T-shaped slide groove 6 is opened at the bottom of the elliptical track 5, a chain plate 7 is rotatably connected inside the first T-shaped slide groove 6, a first hydraulic cylinder 8 is fixedly connected to the bottom of the chain plate 7, a cross bar 9 is fixedly connected to the bottom end of the first hydraulic cylinder 8, and a group of pallets 10 are fixedly connected to the outer wall of the cross bar 9.

[0020] At the same time, the outer wall of the first hydraulic cylinder 8 is rotatably connected to the first bidirectional threaded rod 11, the outer walls of both ends of the first bidirectional threaded rod 11 are threadedly connected to the clamping plates 12, one end of the first bidirectional threaded rod 11 is fixedly connected to the first drive motor 13, one side of a group of clamping plates 12 is respectively fixedly connected to the two ends of the cross bar 9 with telescopic rods 14, a group of pillars 3 The outer wall is fixedly connected to the first fixed plate 15, the top of the first fixed plate 15 is provided with a second drive motor 16, the output shaft power of the second drive motor 16 is connected to the spur gear 17, and the inner side of the chain plate 7 is evenly provided with Teeth 18, grooves 19 are provided on the inner sides of both ends of the elliptical track 5, a group of spur gears 17 extend from the outer sides into the inner walls of the grooves 19 and mesh with the plurality of teeth 18 respectively, and balls 20 are evenly arranged between the inner wall of the bottom of the elliptical track 5 and the chain plate 7, and multiple groups of pallets 10 and clamping plates 12 can be used to queue the color-printed packaging boxes in the elliptical track 5 to avoid conveying difficulties caused by different operation times due to different stacking distances when the device is stacking, but the conveying of the conveyor frame 1 is at a uniform speed, and prevent the frequent start and stop time of the device from affecting the machine life.

[0021] The conveying mechanism is an adsorption frame 28, a top plate 21 is fixedly connected to one side of the elliptical track 5, and the two ends of the other side of the top plate 21 are respectively fixedly connected to the top of the base 2 with inclined frames 22, a group of second hydraulic cylinders 23 are fixedly connected to the bottom of the top plate 21, and the bottom ends of a group of second hydraulic cylinders 23 are fixedly connected to the same moving plate 24, a third driving motor 25 is arranged at the bottom of the moving plate 24, and the output shaft power of the third driving motor 25 is connected to the rotating shaft 26, and the other end of the rotating shaft 26 is fixedly connected to the hydraulic rod 27, and the other end of the hydraulic rod 27 is fixedly connected to the adsorption frame 28, and a plurality of suction cups 29 are evenly arranged on the surface of the adsorption frame 28, and an air pump 30 is arranged on one side of the adsorption frame 28. Compared with the plywood 12, the suction cup 29 reduces the damage to the outer wall of the color-printed packaging box by mechanical force, and the conveying is more stable.

[0022] A base frame 31 is arranged at the bottom of the conveying frame 1 , wherein one of the base frames 31 is fixedly connected to the base 2 , a plurality of conveying rollers 32 are evenly arranged inside the conveying frame 1 , and a controller is arranged at one side of the conveying frame 1 .

[0023] The tilting mechanism is a set of inclined plates 34, the inner side of the conveying frame 1 is rotatably connected with a second bidirectional threaded rod 33, the outer walls of both ends of the second bidirectional threaded rod 33 are threadedly connected with a set of inclined plates 34, the front side of a set of inclined plates 34 is in the same height as the plurality of conveying rollers 32, one end of the second bidirectional threaded rod 33 extends out of the conveying frame 1 and is fixedly connected with a turning handle 35, a second T-shaped slide groove 36 is provided on the inner wall of the conveying frame 1, a sliding rod 37 is fixedly connected inside the second T-shaped slide groove 36, a sliding block 38 is slidably connected to the outer wall of the sliding rod 37, and a set of inclined plates 34 is provided. The front sides of the plates 34 are fixedly connected to a second fixed plate 40, a group of sliders 38 and a group of second fixed plates 40 are rotatably connected with guide plates 39, a group of sliders 38 are slidably connected to a group of second T-shaped slide grooves 36, and return springs 41 are arranged between the inner walls of both sides of the sliders 38 and the second T-shaped slide grooves 36. A group of inclined plates 34 can be adjusted according to the actual size of the color-printed packaging boxes to be stacked, and a group of guide plates 39 can automatically adjust the inclination angle so that the conveyed color-printed packaging boxes are automatically centered.

[0024] The stacking mechanism is an L-shaped plate 43, a vibration plate 42 is arranged on the top of the base 2, a vibration motor is arranged inside the vibration plate 42, the vibration plate 42 is rotatably connected to the L-shaped plate 43, a third T-shaped slide 44 is arranged on the top of the L-shaped plate 43, a third bidirectional threaded rod 45 is rotatably connected to the inner wall of one side of the third T-shaped slide 44, the outer walls of both ends of the third bidirectional threaded rod 45 are threadedly connected to thread sleeves 46, a group of thread sleeves 46 are respectively fixedly connected to the top of the side plate 47, a support frame 49 is arranged on the top of the L-shaped plate 43, a group of side plates A plurality of elastic rods 50 are evenly arranged on the inner side of 47, and the other side of the plurality of elastic rods 50 is fixedly connected to the same inner plate 51, a group of threaded sleeves 46 are slidably connected to the third T-shaped slide groove 44, the other end of the third bidirectional threaded rod 45 extends out of the outside of the L-shaped plate 43 and is fixedly connected to the fourth drive motor 48, the inner side of a group of side plates 47 is naturally in contact with both sides of the supporting bracket 49, and the vibration plate 42 vibrates the color-printed packaging box, so that the plurality of color-printed packaging boxes are more closely fitted and connected, and are more stable in subsequent transportation.

[0025] Working principle: When in use, the handle 35 is turned to rotate the second bidirectional threaded rod 33, so that a group of inclined plates 34 are moved closer or farther away from each other, so that the device can be adjusted according to the size of the color-printed packaging boxes to be stacked. At the same time, a group of guide plates 39 can automatically adjust the inclination angle according to the position of a group of inclined plates 34, so that the conveyed color-printed packaging boxes are automatically centered. The device is started, and the first hydraulic cylinder 8 works to lower the position of the cross bar 9 until the bottom of a group of support plates 10 contacts the surface of the conveying roller 32. Multiple color-printed packaging boxes are conveyed forward at a uniform speed driven by the conveying roller 32. When the packaging box moves to contact the inclined plate 34, the tail is lifted up by the action of the inclined plate 34. At this time, the conveying roller 32 continues to rotate, and the lifted packaging box moves to above a group of support plates 10. The first drive motor 13 works to rotate the first bidirectional threaded rod 11 The first hydraulic cylinder 8 operates to make the cross bar 9 rise and reset. At this time, the chain plate 7 rotates under the drive of the second drive motor 16, so that the support plate 10 and the clamping plate 12 that have completed the clamping move to the other side under the limit of the elliptical track 5, and the support plate 10 and the clamping plate 12 that rotate to the top of the inclined plate 34 continue to complete the clamping. The hydraulic rod 27 works to make the adsorption frame 28 move forward, and the packaging box is stably adsorbed by the suction cup 29 under the action of the air pump 30. The third drive motor 25 works to make the adsorption frame 28 drive the packaging box to rotate, and then the packaging box is stacked under the action of the second hydraulic cylinder 23 and the hydraulic rod 27. The stacked packaging box set is clamped by the inner plate 51, and the vibration plate works to vibrate it to make it tighter.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A palletizing device for automobile parts packaging boxes, comprising a conveyor frame (1), a base (2) and a group of pillars (3), wherein a queuing mechanism and a transport mechanism are arranged on the top of the group of pillars (3), a tilting mechanism is arranged inside the conveyor frame (1), and a palletizing mechanism is arranged on the top of the base (2), characterized in that: The queuing mechanism is an elliptical track (5), a plurality of fixing frames (4) are fixedly connected between the inner wall of the elliptical track (5) and a group of pillars (3), a first T-shaped slide groove (6) is provided at the bottom of the elliptical track (5), a chain plate (7) is rotatably connected inside the first T-shaped slide groove (6), a first hydraulic cylinder (8) is fixedly connected at the bottom of the chain plate (7), a cross bar (9) is fixedly connected at the bottom end of the first hydraulic cylinder (8), and a group of support plates (10) are fixedly connected to the outer wall of the cross bar (9).

2. The palletizing device for automobile parts packaging boxes according to claim 1 is characterized in that: The first hydraulic cylinder (8) is rotatably connected to the outer wall of a first bidirectional threaded rod (11), the outer walls at both ends of the first bidirectional threaded rod (11) are both threadedly connected to clamping plates (12), one end of the first bidirectional threaded rod (11) is fixedly connected to a first drive motor (13), and one side of a group of clamping plates (12) is respectively fixedly connected to the two ends of the cross bar (9) with telescopic rods (14).

3. The palletizing device for automobile parts packaging boxes according to claim 1 is characterized in that: A first fixing plate (15) is fixedly connected to the outer wall of a group of pillars (3), a second drive motor (16) is arranged on the top of the first fixing plate (15), the output shaft of the second drive motor (16) is connected to a spur gear (17), teeth (18) are evenly arranged on the inner side of the chain plate (7), grooves (19) are provided on the inner sides of both ends of the elliptical track (5), a group of spur gears (17) extend from the outer side into the inner wall of the groove (19) and respectively mesh with a plurality of teeth (18), and balls (20) are evenly arranged between the inner wall of the bottom of the elliptical track (5) and the chain plate (7).

4. The palletizing device for automobile parts packaging boxes according to claim 1, characterized in that: The transport mechanism is an adsorption frame (28), one side of the elliptical track (5) is fixedly connected to a top plate (21), the other two ends of the top plate (21) are respectively fixedly connected to the top of the base (2) with inclined frames (22), the bottom of the top plate (21) is fixedly connected to a group of second hydraulic cylinders (23), the bottom ends of the group of second hydraulic cylinders (23) are fixedly connected to the same moving plate (24), a third drive motor (25) is arranged at the bottom of the moving plate (24), the output shaft of the third drive motor (25) is connected to a rotating shaft (26), the other end of the rotating shaft (26) is fixedly connected to a hydraulic rod (27), and the other end of the hydraulic rod (27) is fixedly connected to the adsorption frame (28).

5. The palletizing device for automobile parts packaging boxes according to claim 4 is characterized in that: A plurality of suction cups (29) are evenly arranged on the surface of the adsorption frame (28), and an air pump (30) is arranged on one side of the adsorption frame (28).

6. The palletizing device for automobile parts packaging boxes according to claim 1, characterized in that: A base frame (31) is arranged at the bottom of the conveying frame (1), wherein one of the base frames (31) is fixedly connected to the base (2), a plurality of conveying rollers (32) are evenly arranged inside the conveying frame (1), and a controller is arranged on one side of the conveying frame (1).

7. The palletizing device for automobile parts packaging boxes according to claim 6, characterized in that: The tilting mechanism is a group of inclined plates (34), the inner side of the conveying frame (1) is rotatably connected to a second bidirectional threaded rod (33), the outer walls of both ends of the second bidirectional threaded rod (33) are threadedly connected to the group of inclined plates (34), the front side of the group of inclined plates (34) is consistent with the height of the plurality of conveying rollers (32), one end of the second bidirectional threaded rod (33) extends out of the outer side of the conveying frame (1) and is fixedly connected to a turning handle (35), the inner wall of the conveying frame (1) is provided with a second T-shaped slide groove (36), the interior of the second T-shaped slide groove (36) is fixedly connected to a slide bar (37), the outer wall of the slide bar (37) is slidably connected to a slider (38), the front sides of the group of inclined plates (34) are all fixedly connected to a second fixed plate (40), and a guide plate (39) is rotatably connected between the group of sliders (38) and the group of second fixed plates (40).

8. The palletizing device for automobile parts packaging boxes according to claim 7, characterized in that: A group of the sliding blocks (38) are respectively slidably connected to a group of the second T-shaped sliding grooves (36), and return springs (41) are arranged between the two sides of the sliding blocks (38) and the inner walls of the two sides of the second T-shaped sliding grooves (36).

9. The palletizing device for automobile parts packaging boxes according to claim 1, characterized in that: The stacking mechanism is an L-shaped plate (43), a vibration plate (42) is arranged on the top of the base (2), a vibration motor is arranged inside the vibration plate (42), the vibration plate (42) is rotatably connected to the L-shaped plate (43), a third T-shaped slide groove (44) is opened on the top of the L-shaped plate (43), a third bidirectional threaded rod (45) is rotatably connected to the inner wall of one side of the third T-shaped slide groove (44), both ends of the outer wall of the third bidirectional threaded rod (45) are threadedly connected to thread sleeves (46), a group of thread sleeves (46) are respectively fixedly connected to the top of the side plates (47), a support frame (49) is arranged on the top of the L-shaped plate (43), a plurality of elastic rods (50) are evenly arranged on the inner side of a group of side plates (47), and the other side of the plurality of elastic rods (50) is fixedly connected to the same inner plate (51).

10. The palletizing device for automobile parts packaging boxes according to claim 9, characterized in that: A group of the threaded sleeves (46) are slidably connected to the third T-shaped slide groove (44), the other end of the third bidirectional threaded rod (45) extends out of the outside of the L-shaped plate (43) and is fixedly connected to the fourth drive motor (48), and the inner sides of a group of side plates (47) are naturally in contact with both sides of the support bracket (49).

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