CN219949635U - Continuous box overturning mechanism - Google Patents

Abstract

The utility model relates to the technical field of assembly tobacco processing, in particular to a continuous box overturning mechanism. The box overturning mechanism comprises an overturning assembly, the overturning assembly comprises a fork and an overturning motor for driving the fork to rotate, the fork comprises an intermediate shaft and four baffles which are annularly and uniformly arranged on the intermediate shaft and are used as centers, a smoke box accommodating part is formed between two adjacent baffles, and the intermediate shaft is connected with an output shaft of the overturning motor. According to the utility model, the cross-shaped pallet fork is formed by the four baffles, and the pallet fork forms four smoke box accommodating parts; after each time of overturning, the next empty smoke box accommodating part is just in time overturned to the outlet position of the input conveyor belt so as to allow the next smoke box to enter and overturn, and the pallet fork does not need to reset, so that the continuous overturning of the smoke box is realized, the overturning period is shortened, and the delivery efficiency of the smoke box is improved.

Description

Continuous box overturning mechanism

Technical Field

The utility model relates to the technical field of assembly tobacco processing, in particular to a continuous box overturning mechanism.

Background

In order to meet different requirements of stacking, grabbing, sorting, conveying and code scanning data acquisition of finished product smoke boxes, the finished product smoke boxes need to be overturned at different stations, and the efficiency of the overturning mechanism needs to be correspondingly increased. The overturning mechanism needs to meet the requirement of 455 mm of the hard pack smoke box; the box turning and conveying of the soft package smoke boxes 447, 237, 550+/-2 mm.

The publication No. CN211140701U discloses a conveyor capable of turning and overturning a finished tobacco box, comprising an inclined roller conveying device for arranging a fed tobacco box in a straight line, a vertical roller conveying device for receiving the tobacco box sent out by the inclined roller conveying device and continuing to convey forward, a tobacco box turning device for guiding and turning the tobacco box transported on the vertical roller conveying device, an overturning conveying device for turning the tobacco box and then sending out, and an electric control system for carrying out logic control on the conveyor. The turnover frame in the turnover conveying device is L-shaped, and when the smoke box enters the turnover frame after being fed by the vertical roller conveying device, the turnover frame turns clockwise by 90 degrees towards the discharging side by controlling the gear motor to rotate positively; after the smoke box is sent out, the gear motor is reversed, and when the longer end of the roll-over stand is detected by the return detection, the roll-over stand is reset in place, and the gear motor 35 is stopped.

In this structure, adopt the roll-over stand of L type to overturn the smoke box, after the upset at every turn, the roll-over stand of L type must reset the back just can overturn next smoke box, has the problem that turnover efficiency is low.

Disclosure of Invention

The utility model aims to solve the problems and provides a box overturning mechanism capable of continuously overturning a smoke box.

The utility model provides a continuous box overturning mechanism, which is arranged between an input conveyor belt and an output conveyor belt, wherein the box overturning mechanism comprises an overturning assembly, the overturning assembly comprises a fork and an overturning motor for driving the fork to rotate, the fork comprises an intermediate shaft and four baffle plates which are uniformly arranged on the intermediate shaft in a ring shape with the intermediate shaft as a center, a smoke box accommodating part is formed between two adjacent baffle plates, and the intermediate shaft is connected with an output shaft of the overturning motor.

Preferably, the two adjacent baffles form an inside angle.

As the preferable choice of the utility model, the said overturning assembly also includes two stabilizing frames, two said stabilizing frames are connected with both ends of the said jackshaft through the rolling bearing separately; the intermediate shaft is connected with an output shaft of the overturning motor through a gear reducer.

Preferably, the lifting device further comprises a lifting assembly for driving the overturning assembly to lift; the fixed part of the overturning motor is arranged on the stabilizing frames, and the two stabilizing frames are connected with the lifting assembly.

As a preferred aspect of the present utility model, the present utility model further comprises a middle conveyor belt; the middle conveyor belt comprises two parallel fixing frames, a plurality of roller pieces are respectively arranged on the two fixing frames along the conveying direction of the smoke box, one end of each roller piece is rotationally connected with the fixing frame, and the other end of each roller piece is a free end; a turnover gap for the fork to pass through is formed between the free end of the upper roller piece of one fixing frame and the free end of the upper roller piece of the other fixing frame; the middle conveyor belt further comprises a driving piece for driving the roller pieces to rotate in the same direction.

In the present utility model, the stabilizer is slidably connected to the fixing frame, and the fixing frame or the stabilizer is provided with a limiting portion for limiting a lifting distance of the stabilizer.

Preferably, the baffle plate comprises a stop surface for abutting against the side surface of the smoke box and a bearing surface opposite to the stop surface for abutting against the bottom surface of the smoke box, wherein the length of the bearing surface perpendicular to the axial direction of the intermediate shaft is smaller than the length of the shortest side of the smoke box and larger than half of the length of the shortest side of the smoke box.

Preferably, the bearing surface of one baffle is on the same plane with the stop surface of the opposite baffle.

Preferably, the length of the bearing surface perpendicular to the axial direction of the intermediate shaft is less than half the length of the longest side of the smoke box.

Preferably, the baffle plate comprises a bearing plate and a stop plate which are parallel, the bearing plate and the stop plate are connected through a connecting plate, one surface of the bearing plate, which is far away from the stop plate, forms the bearing surface, and one surface of the stop plate, which is far away from the bearing plate, forms the stop surface; the free end of the bearing plate protrudes out of the free end of the stop plate.

The utility model has the beneficial effects that:

1. according to the utility model, the cross-shaped pallet fork is formed by the four baffles, and the pallet fork forms four smoke box accommodating parts; after each time of overturning, the next empty smoke box accommodating part is just in time overturned to the outlet position of the input conveyor belt so as to allow the next smoke box to enter and overturn, and the pallet fork does not need to reset, so that the continuous overturning of the smoke box is realized, the overturning period is shortened, and the delivery efficiency of the smoke box is improved.

2. In the utility model, the lifting component is additionally arranged to improve the application range of the box turning mechanism: in the occasion that the overturning is not needed, the lifting component drives the overturning component to descend so as to avoid stopping and overturning the smoke box, and the smoke box can flow out smoothly; in the occasion that needs to overturn, drive the upset subassembly through lifting unit and rise in order to snatch the smoke box and overturn.

3. In the utility model, the middle conveyor belt is additionally arranged to drive the smoke box to convey in the occasion without overturning, so that the smoke box is prevented from overturning due to a gap formed by descending the overturning assembly.

Drawings

FIG. 1 is a schematic diagram of a turnover assembly in a continuous box turnover mechanism;

FIG. 2 is a front view of a tipping assembly in a continuous tipping mechanism;

FIG. 3 is a top view of a continuous box turnover mechanism;

FIG. 4 is a schematic diagram of one embodiment of a fork in a continuous box-turning mechanism;

FIG. 5 is a schematic view of another embodiment of a fork in a continuous box-turning mechanism;

FIG. 6 is a schematic view of a further embodiment of a fork in a continuous box-turning mechanism;

in the figure: the conveyor belt 1, the output conveyor belt 2, the forks 31, the intermediate shaft 311, the baffle plate 312, the stop surface 312a, the receiving surface 312b, the receiving plate 313, the stop plate 314, the connecting plate 315, the turnover motor 32, the stabilizing frame 33, the lifting assembly 4, the fixing frame 51, and the roller 52.

Detailed Description

The following is a specific embodiment of the present utility model, and the technical solution of the present utility model is further described with reference to the accompanying drawings, but the present utility model is not limited to these examples.

Example 1

Most of the smoke boxes are of a cube structure, and when the smoke boxes are stored, in order to reduce the occupied area of the smoke boxes and store more smoke boxes in a limited warehouse, the smoke boxes are generally stored vertically, namely, the side of the smoke box with smaller area is the bottom surface, and the side with larger area is the side surface. When the smoke box is needed to be used later, the smoke box in the upright state needs to be turned to be in a lying state for convenience in use, namely, the surface with the larger area of the smoke box is the bottom surface, and the surface with the smaller area is the side surface, and at the moment, the smoke box needs to be turned through the box turning mechanism.

The utility model provides a continuous box turning mechanism, which is arranged between an input conveyor belt 1 and an output conveyor belt 2 as shown in fig. 3, wherein the input conveyor belt 1 is used for conveying a vertical smoke box into the box turning mechanism, and the output conveyor belt 2 is used for conveying the smoke box in a lying state after being turned to a next station. The structures of the input conveyor belt 1 and the output conveyor belt 2 are not limited, so long as the input and output of the smoke box can be completed, in this embodiment, the input conveyor belt 1 and the output conveyor belt 2 both use a roller conveyor, and the roller conveyor is a conveying device commonly used in the prior art, and mainly comprises a frame, a transmission roller and a driving piece, and the transmission roller is driven to rotate by the driving piece so as to complete conveying.

The box turning mechanism mainly comprises a turning assembly, as shown in fig. 1 and 2, the turning assembly comprises a fork 31 and a turning motor 32 for driving the fork 31 to rotate.

The overturning motor 32 is a common motor in the prior art, and comprises a fixed part and an output shaft, and the fork 31 is connected with the output shaft thereof, so that the fork 31 can be driven to rotate. Considering that the overturning speed should not be too fast, a gear reducer is further provided for reducing the rotating speed, and the gear reducer is a common device in the prior art, and the structure of the gear reducer is not repeated in this embodiment.

As shown in fig. 4, the fork 31 includes an intermediate shaft 311 and a baffle 312 disposed on the intermediate shaft 311, where the intermediate shaft 311 is connected to the output end of the gear reducer, and the baffle 312 is a common straight plate, or may be solid or hollow, and one end of the baffle is welded to the intermediate shaft 311, and the other end is a free end. Since the smoke boxes are cubes, the number of the baffles 312 is four, the four baffles 312 are uniformly arranged on the intermediate shaft 311 in a ring shape with the intermediate shaft 311 as a center, two adjacent baffles 312 are vertical, and a smoke box accommodating portion is formed between the two adjacent baffles 312, so that it can be seen that the pallet fork 31 has four smoke box accommodating portions. When in use, according to the direction in fig. 4, the smoke box enters the right upper smoke box accommodating part and is driven to turn over by the way that the fork 31 rotates 90 degrees anticlockwise, the original right upper smoke box accommodating part reaches the left upper part, and the original right upright smoke box reaches the left side to form a lying smoke box. And after the overturning, the original left smoke box accommodating part is overturned to the right upper part for being used for abutting against the next upright smoke box. Based on this, a continuous overturning of the smoke box is achieved.

Wherein, in order to improve the grabbing effect of the fork on the smoke box, the bottom and the side of the smoke box are preferably abutted with the baffle 312 to increase friction force. At this time, the thickness of the baffle 312 and the outer diameter of the intermediate shaft 311 need to be adjusted. If the thickness of the baffle plates 312 is smaller than the outer diameter of the intermediate shaft 311, an arc-shaped inner angle is formed between two adjacent baffle plates 312 based on the arc-shaped surface of the intermediate shaft 311, and the smoke box is a cube, and the arc-shaped inner angle stops the abutting of the side surface of the smoke box and the baffle plates 312. Therefore, in the present embodiment, the thickness of the baffle plates 312 is increased to form a right-angle internal angle between two adjacent baffle plates 312, and based on this, as shown in fig. 4, both the bottom and the side of the smoke box can abut against the baffle plates 312. At this time, both surfaces of the baffle 312 are referred to as a stopper surface 312a for abutting against the side surface of the smoke box and a receiving surface 312b for abutting against the bottom surface of the smoke box, which faces the stopper surface 312a.

On this basis, the length of the receiving surface 312b perpendicular to the axial direction of the intermediate shaft 311 is controlled to be smaller than the shortest length of the smoke box and larger than half the shortest length of the smoke box. According to the direction shown in fig. 4, the length of the receiving surface 312b perpendicular to the axial direction of the intermediate shaft 311 is the length of the horizontal direction 312b (4) and 312b (2), and the length of the vertical direction 312b (1) and 312b (3). The control length is less than the shortest length of the smoke box in order to keep a part of the smoke box on the input conveyor 1 at the time of input, so that the input conveyor 1 drives the smoke box forward until the smoke box side abuts against the vertical baffle 312. The control length is greater than half of the shortest length of the smoke box, so that the gravity center of the smoke box is located on the horizontal baffle 312 after the lateral part of the smoke box is abutted against the vertical baffle 312, and the pallet fork 31 can smoothly drive the smoke box to turn over, so that the smoke box is prevented from falling off from the baffle 312.

In this embodiment, the overturning assembly only provides the overturning function, and the conveying surface of the input conveyor belt 1 and the conveying surface of the output conveyor belt 2 are on the same plane, so that the height of the smoke box before and after overturning should not be changed, and therefore, in this embodiment, the bearing surface 312b of the baffle plate 312 is required to be on the same plane as the stop surface 312a of the baffle plate 312 opposite thereto. Specifically, as shown in fig. 4, the four baffles 312 are respectively denoted as 1, 2, 3, and 4, the 1 st baffle 312 is opposite to the 3 rd baffle 312, the 2 nd baffle 312 is opposite to the 4 th baffle 312, the receiving surface 312b (4) of the 4 th baffle is required to be controlled to be on the same plane as the stop surface 312a (2) of the 2 nd baffle, and the rest is the same.

In addition, in order to ensure the rotation stability of the fork 31, as shown in fig. 1, 2 and 3, the overturning assembly further comprises two stabilizing frames 33, wherein the two stabilizing frames 33 are respectively connected with two ends of the intermediate shaft 311 through rotating bearings; the intermediate shaft 311 is connected to the output shaft of the turnover motor 32 through a gear reducer, where the gear reducer may be a sprocket chain structure, that is, includes a first sprocket disposed on the intermediate shaft 311, a second sprocket disposed on the turnover motor 32, and a chain engaged with the first sprocket and the second sprocket. In this embodiment, the stabilizing frame 33 is fixedly disposed between the input conveyor 1 and the output conveyor 2, and further, two ends of the stabilizing frame 33 may be respectively connected to the frames of the input conveyor 1 and the output conveyor 2, and the rotating stability of the fork 31 is ensured by the fixed stabilizing frame 33.

Example 2

This embodiment is substantially the same as embodiment 1, except that: the overturning component is liftable.

In some cases, the smoke box on the input conveyor 1 may already be lying flat and need not be flipped.

Based on this, the present embodiment first further includes a lifting assembly 4 for driving the tilting assembly to lift. Specifically, as shown in fig. 1, the two stabilizing frames 33 are first connected to form an integral frame through a connecting frame, the intermediate shaft 311 is still rotatably connected to the stabilizing frames 33, and at this time, the fixed portion of the turnover motor 32 is required to be disposed on the stabilizing frames 33, and then the integral frame is connected to the lifting assembly 4. The lifting assembly 4 is not limited in structure, in this embodiment, two cylinders are adopted, and piston rods of the two cylinders are respectively connected with two ends of the integral frame, so that the integral frame is driven, that is, the fork 31 and the turnover motor 32 are driven to ascend and descend, and the driving of the turnover motor 32 to the fork 31 is not affected.

When the smoke box is not required to be overturned, the whole frame is controlled to wholly descend through the air cylinder, so that the baffle plate 312 of the fork 31 cannot contact the smoke box, and the smoke box can be prevented from being overturned. At this time, there is a gap between the input conveyor 1 and the output conveyor 2, which affects the conveyance of the smoke box. To assist the flow of smoke boxes from the input conveyor 1 to the output conveyor 2, the box turnover mechanism also includes a central conveyor. As shown in fig. 3, the middle conveyor belt comprises two parallel fixing frames 51, the two fixing frames 51 are respectively provided with a plurality of roller pieces 52 along the conveying direction of the smoke box, one ends of the roller pieces 52 are rotationally connected with the fixing frames 51 through a rotating bearing, and the other ends of the roller pieces 52 form free ends, and the axial length of the roller pieces 52 is not very long, so that the problem of instability cannot exist even if the free ends are suspended. A turnover gap through which the fork 31 can pass is formed between the free end of the roller 52 on the left fixing frame 51 and the free end of the roller 52 on the right fixing frame 51, and the width of the turnover gap is smaller than that of the smoke box, so that two ends of the smoke box can be respectively lapped on the roller 52 at two ends to be driven by the roller 52. Of course, the middle conveyor belt further comprises a driving member for driving the roller members 52 to rotate in the same direction, the driving member adopts a driving structure in the existing roller conveyor belt technology, for example, the driving member can adopt two gear motors, chain wheels are sleeved on the roller members 52 and output shafts of the gear motors, then chain wheels of a plurality of roller members 52 on the left fixing frame 51 are meshed with chain wheels of an output shaft of one gear motor through a chain, chain wheels of a plurality of roller members 52 on the right fixing frame 51 are meshed with chain wheels of an output shaft of another gear motor through a chain, and then the rotation speeds and directions of the two gear motors are regulated and controlled to be consistent.

When the smoke box is required to be overturned, the whole frame is controlled to wholly ascend through the air cylinder, so that the pallet fork 31 reaches the plane where the conveying surfaces of the input conveyor belt 1 and the output conveyor belt 2 are located. In order to precisely control the lifting distance, the stabilizing frame 33 may be slidably connected to the fixing frame 51, and the fixing frame 51 or the stabilizing frame 33 may be provided with a limiting portion for limiting the lifting distance of the stabilizing frame 33. Specifically, as shown in fig. 1 and 2, the fixing frame 51 includes a riser and a cross plate, and in order to avoid the overturning assembly above the shielding, only a lower portion of the riser of the fixing frame 51 is shown in fig. 1 and 2, and it is necessary to extend an upper end of the riser of the fixing frame 51 upward for mounting the above-described roller 52 such that the conveying surface of the roller 52 is flush with the conveying surfaces of the input conveyor 1 and the output conveyor 2. The fixing frame 51 is fixed, a transverse plate of the fixing frame 51 is provided with a through hole through which a piston rod of an air cylinder can pass, and a fixing part of the air cylinder is arranged on the fixing frame 51. Meanwhile, the stabilizing frame 33 is connected with a sliding rod, and a transverse plate of the fixing frame 51 is provided with a through hole for the sliding rod to pass through, namely, the stabilizing frame 33 is in sliding connection with the fixing frame 51. One end of the sliding rod is connected with the stabilizing frame 33, and a stop block with the outer diameter larger than the inner diameter of the through hole is arranged at the other end of the sliding rod after penetrating through the through hole, when the sliding rod ascends until the stop block contacts with the transverse plate of the fixing frame 51, the sliding rod is stopped, namely the stabilizing frame 33 continues to ascend; when the stabilizer 33 descends to contact the transverse plate of the fixing frame 51, the stabilizer 33 is stopped from descending continuously, and the stop block and the transverse plate are the limiting parts.

Wherein, in order to distinguish the state of smoke box on the input conveyer belt 1 fast in order to judge whether to need go up and down the upset subassembly, can set up photoelectric sensor in the exit end of input conveyer belt 1 generally, judge the state of smoke box through detecting the height of smoke box, be connected photoelectric sensor and lift subassembly 4 electricity simultaneously in order to go up and down the operation according to the judgement result.

Secondly, the length of the baffle 312 is further adjusted, as shown by a smoke box indicated by a dotted line in fig. 4, the length of the control bearing surface 312b perpendicular to the axial direction of the intermediate shaft 311 is less than half of the length of the longest side of the smoke box, that is, even if the smoke box enters the pallet fork 31 in a lying state, the bottom surface and the side surface of the smoke box are respectively abutted against the baffle 312, and because the length of the bearing surface 312b is shorter, the bearing area of the smoke box on the lying flat smoke box is not more than half of the bottom surface of the smoke box, and the center of the smoke box is not on the baffle 312, at this time, the smoke box is difficult to be driven to turn by turning over the pallet fork 31, and the smoke box is easy to fall off from the baffle 312, so that unnecessary turning is avoided.

Example 3

This embodiment is substantially the same as embodiment 1, except that: in this embodiment, the flip assembly also provides a height adjustment function.

As shown in fig. 5, four baffles 312 are still labeled 1, 2, 3, 4, respectively, with baffle 1 312 opposite baffle 3, baffle 2 opposite baffle 312, and baffle 4 opposite baffle 312. By increasing the outer diameter of the intermediate shaft 311 and reducing the thickness of the baffle plate 312 and adjusting the mounting position of the baffle plate 312 on the intermediate shaft 311, it is possible to control the receiving surface 312b of the baffle plate 312 not to be on the same plane as the stop surface 312a of the baffle plate 312 opposite thereto. For example, in fig. 5, the receiving surface 312b (4) of the 4 th baffle is higher than the stop surface 312a (2) of the 2 nd baffle, and after the smoke box is turned over by the fork 31, the conveying height of the smoke box is reduced so as to adapt to the assembly line of some input conveyor belts 1 and output conveyor belts 2 which are not in the same plane.

Similarly, the receiving surface 312b (4) of the 4 th baffle plate can be controlled to be lower than the stop surface 312a (2) of the 2 nd baffle plate, and the conveying height can be increased through the overturning assembly.

Example 4

This embodiment is substantially the same as embodiment 1, except that: the baffle 312 is structurally different.

As shown in fig. 6, the baffle 312 includes a receiving plate 313 and a stop plate 314 that are parallel, the receiving plate 313 and the stop plate 314 are connected by a connecting plate 315, a surface of the receiving plate 313 away from the stop plate 314 forms a receiving surface 312b, and a surface of the stop plate 314 away from the receiving plate 313 forms a stop surface 312a. In this embodiment, the free end of the control receiving plate 313 protrudes from the free end of the stop plate 314, so that on the one hand, compared with the solid straight plate in embodiment 1, the mass of the stop plate 312 is reduced, and the load of the turnover motor 32 is reduced; on the other hand, comparing fig. 4 and 6, it can be seen that in fig. 6, a wider gap exists between the conveying surface of the output conveyor belt 2 and the stop surface 312a (2) of the turning assembly, so that the friction area of the baffle 312 to the smoke box is reduced, and the smoke box is discharged conveniently.

In addition, in order to avoid damage to the smoke box, the free end of the receiving plate 313 is also provided as an arc surface, and the outer corner formed by the stop plate 314 and the connecting plate 315 is designed as a rounded corner.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims (10)

1. The utility model provides a continuous type turns over case mechanism, sets up between input conveyer belt (1) and output conveyer belt (2), its characterized in that: the box turning mechanism comprises a turning assembly, the turning assembly comprises a fork (31) and a turning motor (32) for driving the fork (31) to rotate, the fork (31) comprises an intermediate shaft (311) and four baffles (312) which are annularly and uniformly arranged on the intermediate shaft (311) with the intermediate shaft (311) as a center, a smoke box accommodating part is formed between every two adjacent baffles (312), and the intermediate shaft (311) is connected with an output shaft of the turning motor (32).

2. A continuous box-turning mechanism according to claim 1, characterized in that: the adjacent two baffles (312) form a right-angle inner angle.

3. A continuous box-turning mechanism according to claim 1, characterized in that: the overturning assembly further comprises two stabilizing frames (33), and the two stabilizing frames (33) are respectively connected with two ends of the intermediate shaft (311) through rotating bearings; the middle shaft (311) is connected with an output shaft of the overturning motor (32) through a gear reducer.

4. A continuous box-turning mechanism according to claim 3, characterized in that: the lifting assembly (4) is used for driving the overturning assembly to lift; the fixed part of the overturning motor (32) is arranged on the stabilizing frames (33), and the two stabilizing frames (33) are connected with the lifting assembly (4).

5. The continuous box-turning mechanism according to claim 4, wherein: the device also comprises a middle conveyor belt; the middle conveyor belt comprises two parallel fixing frames (51), wherein a plurality of roller pieces (52) are respectively arranged on the two fixing frames (51) along the conveying direction of the smoke box, one end of each roller piece (52) is rotationally connected with the fixing frame (51), and the other end of each roller piece is a free end; a turnover gap through which the fork (31) can pass is formed between the free end of the upper roller (52) of one fixing frame (51) and the free end of the upper roller (52) of the other fixing frame (51); the intermediate conveyor further includes a drive member for driving the roller members (52) in rotation in the same direction.

6. The continuous box-turning mechanism according to claim 5, wherein: the stabilizing frame (33) is in sliding connection with the fixing frame (51), and the fixing frame (51) or the stabilizing frame (33) is provided with a limiting part for limiting the lifting distance of the stabilizing frame (33).

7. A continuous box-turning mechanism according to claim 2, characterized in that: the baffle plate (312) comprises a stop surface (312 a) for abutting against the side surface of the smoke box and a bearing surface (312 b) opposite to the stop surface (312 a) for abutting against the bottom surface of the smoke box, wherein the length of the bearing surface (312 b) perpendicular to the axial direction of the intermediate shaft (311) is smaller than the length of the shortest side of the smoke box and larger than half of the length of the shortest side of the smoke box.

8. The continuous box-turning mechanism according to claim 7, wherein: a receiving surface (312 b) of the baffle plate (312) is on the same plane with a stop surface (312 a) of the baffle plate (312) opposite to the receiving surface.

9. The continuous box-turning mechanism according to claim 7, wherein: the length of the bearing surface (312 b) perpendicular to the axial direction of the intermediate shaft (311) is less than half of the length of the longest side of the smoke box.

10. The continuous box-turning mechanism according to claim 7, wherein: the baffle plate (312) comprises a bearing plate (313) and a stop plate (314) which are parallel, the bearing plate (313) and the stop plate (314) are connected through a connecting plate (315), one surface of the bearing plate (313) far away from the stop plate (314) forms a bearing surface (312 b), and one surface of the stop plate (314) far away from the bearing plate (313) forms a stop surface (312 a); the free end of the receiving plate (313) protrudes beyond the free end of the stop plate (314).