CN217779872U

CN217779872U - Automatic material returning system of heating kiln

Info

Publication number: CN217779872U
Application number: CN202221427722.1U
Authority: CN
Inventors: 刘洪宝; 薄俊东; 王引泉; 周永光
Original assignee: Bayannaoer Yixin New Material Co ltd
Current assignee: Bayannaoer Yixin New Material Co ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-11-11
Anticipated expiration: 2032-06-09

Abstract

The utility model relates to the technical field of iron sheet cabinet polishing powder production, and discloses an automatic material return system of a heating kiln, which comprises a roller kiln, wherein a charging tray is placed on a roller of the roller kiln, the charging tray is square, the top surface is a notch for placing polishing powder, four outer side surfaces of the charging tray are planes, and four edges of the bottom surface of the charging tray are in a circular angle shape; a kiln opening of the roller kiln is provided with a first conveying mechanism for driving a material tray to move, and the conveying direction of the first conveying mechanism is vertical to the conveying direction of the roller kiln; a second conveying mechanism for driving the material tray to move is arranged at the kiln tail of the roller kiln, and the conveying direction of the second conveying mechanism is vertical to the conveying direction of the roller kiln; a third conveying mechanism for driving the material tray to move is arranged in a gap between the first conveying mechanism and the second conveying mechanism; the application forms the closed loop transfer chain of returning the shape, can realize the continuous transportation of charging tray, and the polishing powder circulation gets into the kiln body and burns, has alleviateed workman's intensity of labour, and production safety obtains improving.

Description

Automatic material returning system of heating kiln

Technical Field

The utility model relates to an iron sheet cabinet polishing powder production technical field, in particular to automatic system of returning of material of heating kiln.

Background

The polishing powder is mainly used for polishing and grinding materials such as glass, stainless steel, stone, ceramic tiles and the like, and in the production and processing process, a gas roller kiln, also called a roller hearth kiln, which uses a rotating roller as a tunnel kiln of a blank carrying tool is required to be widely applied to the conventional heat treatment of various oxides, ceramics, rare earth, ultra-pure powder and magnetic materials.

The existing polishing powder firing process is that a material tray containing raw materials is placed on a roller at one end of a roller kiln and continuously rotates along with the roller, so that the material tray is sent out from the other end of the roller kiln, but the raw materials cannot be sufficiently dried by one-time firing.

Disclosure of Invention

The utility model aims at providing a material automatic carriage return system of heating kiln can form a loop closed loop conveying line, can realize the continuous conveying of charging tray, and the polishing powder circularly enters the kiln body to be fired, thereby reducing the labor intensity of workers and improving the production safety; the problems in the background art are effectively solved.

The utility model adopts the technical scheme as follows: a material automatic return system of a heating kiln comprises a roller kiln, wherein a material tray is placed on a roller of the roller kiln, the material tray is square, the top surface of the material tray is a notch for placing polishing powder, four outer side surfaces of the material tray are all planes, and four edges of the bottom surface of the material tray are all in a shape of a circular horn; a kiln opening of the roller kiln is provided with a first conveying mechanism for driving a material tray to move, and the conveying direction of the first conveying mechanism is vertical to the conveying direction of the roller kiln; a second conveying mechanism for driving the material tray to move is mounted at the tail of the roller kiln, and the conveying direction of the second conveying mechanism is perpendicular to the conveying direction of the roller kiln; and a third conveying mechanism for driving the material tray to move is arranged in a gap between the first conveying mechanism and the second conveying mechanism.

The beneficial effect who adopts above-mentioned scheme is: the stable transition of the charging tray can be ensured by limiting the structure of the charging tray, and the fillet-shaped structure can avoid the formation of structural interference and prevent the charging tray from falling off in the process of multiple reversing; the U-shaped conveying line is formed by arranging 3 conveying mechanisms, the U-shaped conveying line is matched with a roller of a roller kiln, the loop-shaped closed-loop conveying line is further formed, mechanical conveying of a material tray can be achieved, the material tray circularly enters a kiln body to be fired, the labor intensity of workers is reduced, and the production safety is improved.

Further, the first conveying mechanism comprises a rack, and a rotating shaft is rotatably connected to the rack; the rotating shaft is fixedly connected with symmetrically arranged driving sprockets; the driving chain wheel is connected with a driven chain wheel through a chain, the upper surface of the chain is flush with the upper surface of the roller kiln, charging trays can be placed on the two chains, and the rotating shaft is connected with a first motor through chain transmission; the second conveying mechanism, the third conveying mechanism and the first conveying mechanism have the same structure.

The beneficial effect of adopting the above further scheme is: the position of the chain is limited, so that the charging tray can be stably moved from the roller to the chain; can bear the charging tray displacement through setting up the chain, the chain heat resistance is good, has guaranteed that the charging tray of high temperature can mechanical transport.

Furthermore, a first reversing mechanism is installed at the mouth of the roller kiln, a second reversing mechanism is installed at the tail of the roller kiln, a third reversing mechanism and a fourth reversing mechanism are installed on the outer side of the roller kiln, the third reversing mechanism corresponds to the second reversing mechanism, and the fourth reversing mechanism corresponds to the first reversing mechanism.

The beneficial effect of adopting the further scheme is that: the moving direction of the material tray can be adjusted at the head and the tail of the conveying mechanism by arranging the four reversing mechanisms, manual reversing is not needed, the problem that the material tray falls is avoided, continuous mechanical conveying of the material tray is realized, and only one person needs to be responsible for checking whether the material tray moves normally.

Further, the first reversing mechanism comprises a support frame, bearing blocks are fixed on the support frame through bolts and are arranged at equal intervals, a steel roller is rotatably connected between the opposite bearing blocks, and the conveying direction of the steel roller is the same as that of the roller kiln; the upper surface of the steel roller is higher than that of the bearing seat, and the upper surface of the steel roller is flush with that of the roller kiln; gaps are reserved between the adjacent steel rollers and used for arranging chains, the rack is fixed on the support frame, and the shaft ends of the steel rollers are connected with a second motor through chain transmission; the second reversing mechanism, the third reversing mechanism and the fourth reversing mechanism are identical to the first reversing mechanism in structure.

The beneficial effect of adopting the further scheme is that: the position of the steel roller is limited, so that the charging tray can be stably moved to the steel roller from the chain; can bear the charging tray displacement through setting up the steel roll to 90 rotatory charging tray direction of delivery, the steel roll strip heat resistance is good, has guaranteed that the charging tray of high temperature can the switching-over be carried.

Furthermore, height-adjusting supports which are arranged in a matrix mode are detachably mounted on the supporting frame, each height-adjusting support comprises a base plate, and the base plates are placed on the ground and are circular; the top surface welding of chassis has the screw rod, twists two set nut about having on the screw rod.

The beneficial effect of adopting the further scheme is that: the height of the supporting frame can be adjusted by rotating the position of the positioning nut, and the steel roller, the chain and the roller are ensured to be on the same horizontal plane.

Furthermore, the periphery of support frame is fixed with the guard plate through the bolt, and the material of guard plate is corrosion resistant plate.

The beneficial effect of adopting the further scheme is that: workers can be separated by arranging the protection plate, and the production safety is improved.

Further, the welding has the hanging beam on the support frame, and the quantity of hanging beam is two, and the hanging beam is parallel with the horizontal plane, and the welding has vertical ascending montant on the hanging beam, and the montant passes the space and is connected with the baffle, and the baffle is located the top of steel roller, and the shape of baffle is the L type.

The beneficial effect of adopting the further scheme is that: the moving position of the material tray can be controlled by arranging the suspension beam, and the center line of the material tray is ensured to be superposed with the center line of the chain after the material tray contacts the baffle; the vertical rods are arranged, so that the baffle can be suspended in the air, and the baffle is prevented from blocking the rotation of the steel roller; the baffle plate is arranged to ensure that the material tray continues to move along the chain after changing the direction.

Further, a sliding groove is processed on the top surface of the suspension beam, and the cross section of the sliding groove is in a convex shape; the vertical rod is a stud, the tail part of the vertical rod slides in the sliding groove, the side wall of the vertical rod is in threaded connection with a first limiting nut, and the vertical rod and the suspension beam are fixed by screwing the first limiting nut; the head of the vertical rod penetrates through the gap to be connected with a baffle, a through groove is formed in the horizontal section of the baffle, and the vertical rod and the through groove are fixed through two second limiting nuts.

The beneficial effect of adopting the further scheme is that: the position of the vertical rod can be adjusted by arranging the sliding groove, so that the vertical rod can pass through the gap, and the structural interference is avoided; the position of the baffle can be adjusted by arranging the through groove, so that the center line of the material tray is overlapped with the center line of the chain after the material tray contacts the baffle; the applicability is good, and the production cost is low.

The beneficial effects of the utility model reside in that: the application forms the closed loop transfer chain of shape of paper clip, can realize the continuous conveyor of charging tray, and the polishing powder circulation gets into the kiln body and burns, has alleviateed workman's intensity of labour, and the production safety obtains improving.

Drawings

Fig. 1 is a schematic top view of the present invention.

Fig. 2 is a schematic perspective view of the tray.

Fig. 3 is a schematic perspective view of the first conveying mechanism.

Fig. 4 is a side sectional view of the first conveying mechanism.

Fig. 5 is a schematic top view of the present invention.

Fig. 6 is a schematic perspective view of the first reversing mechanism.

Fig. 7 is a front view structural schematic diagram of the first reversing mechanism.

Fig. 8 is a side sectional structure diagram of the first reversing mechanism.

Fig. 9 is a perspective view of the height-adjustable support.

Fig. 10 is a perspective view of the guard plate.

Fig. 11 is a side view of the baffle.

Fig. 12 is a side sectional view of the baffle.

Fig. 13 is a schematic perspective view illustrating a first exemplary embodiment of a baffle plate.

Fig. 14 is a schematic perspective view of a second baffle according to the second embodiment.

In the figure: 1. a roller kiln; 2. a material tray; 3. a first conveying mechanism; 4. a second conveying mechanism; 5. a third conveying mechanism; 6. a frame; 7. a rotating shaft; 8. a drive sprocket; 9. a chain; 10. a driven sprocket; 11. a first motor; 12. a first reversing mechanism; 13. a second reversing mechanism; 14. a third reversing mechanism; 15. a fourth reversing mechanism; 16. a support frame; 17. a bearing seat; 18. a steel roll; 19. a void; 20. a second motor; 21. heightening the support; 22. a chassis; 23. a screw; 24. positioning a nut; 25. a protection plate; 26. a suspension beam; 27. a vertical rod; 28. a baffle plate; 29. a chute; 30. a first limit nut; 31. a through groove; 32. and a second limiting nut.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "height", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second", "third", "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

As shown in fig. 1, an automatic material return system of a heating kiln comprises a roller kiln 1, wherein a material tray 2 is placed on a roller of the roller kiln 1, as shown in fig. 2, the material tray 2 is square, the top surface of the material tray is a notch for placing polishing powder, four outer side surfaces of the material tray 2 are planes, four edges of the bottom surface of the material tray 2 are in a circular-angle shape, the stable transition of the material tray 2 can be ensured by limiting the structure of the material tray 2, and the circular-angle-shaped structure can avoid the formation of structural interference and avoid the material tray 2 from falling off in the multiple reversing process; a first conveying mechanism 3 for driving the material tray 2 to move is arranged at the mouth of the roller kiln 1, and the conveying direction of the first conveying mechanism 3 is vertical to the conveying direction of the roller kiln 1; a second conveying mechanism 4 for driving the material tray 2 to move is arranged at the tail of the roller kiln 1, and the conveying direction of the second conveying mechanism 4 is vertical to the conveying direction of the roller kiln 1; a third conveying mechanism 5 for driving the charging tray 2 to move is arranged in a gap between the first conveying mechanism 3 and the second conveying mechanism 4; the U-shaped conveying line is formed by arranging 3 conveying mechanisms, the U-shaped closed-loop conveying line is further formed by matching with rollers of the roller kiln 1, mechanical conveying of the material tray 2 can be realized, the material tray circularly enters the kiln body to be fired, the labor intensity of workers is reduced, and the production safety is improved.

As shown in fig. 3, as optimization of the embodiment, considering the influence of the structure of 3 conveying mechanisms on the conveying of the material tray 2 and the material tray 2 is in a high-temperature state, the first conveying mechanism 3 comprises a frame 6, and a rotating shaft 7 is rotatably connected to the frame 6; the rotating shaft 7 is fixedly connected with driving chain wheels 8 which are symmetrically arranged; the driving sprocket 8 is connected with a driven sprocket 10 through a chain 9, as shown in fig. 4, the upper surface of the chain 9 is flush with the upper surface of the roller kiln 1, so that the charging tray 2 can be stably moved from the roller to the chain 9, the charging trays 2 can be placed on the two chains 9, the rotating shaft 7 is connected with a first motor 11 through chain transmission, in order to ensure the tension degree of the chain 9, the chain 9 can be provided with a plurality of sections, and the surface of each section of chain 9 is flush; the second conveying mechanism 4 and the third conveying mechanism 5 have the same structure as the first conveying mechanism 3; can bear the weight of the displacement of charging tray 2 through setting up chain 9, chain 9 heat resistance is good, has guaranteed that charging tray 2 of high temperature can mechanical transport.

As shown in fig. 5, as an optimization of the embodiment, considering that the charging tray 2 needs to be manually reversed at the head and tail sections of the conveying mechanism, if an error occurs, the charging tray 2 may fall off, a first reversing mechanism 12 is installed at the kiln mouth of the roller kiln 1, a second reversing mechanism 13 is installed at the kiln tail of the roller kiln 1, a third reversing mechanism 14 and a fourth reversing mechanism 15 are installed at the outer side of the roller kiln 1, the third reversing mechanism 14 corresponds to the second reversing mechanism 13, and the fourth reversing mechanism 15 corresponds to the first reversing mechanism 12; can adjust charging tray 2 moving direction at conveying mechanism's head and the tail through setting up four reversing mechanism, do not need artificial switching-over, avoided the problem that charging tray 2 dropped, realized charging tray 2's continuous mechanical transport, only need alone be responsible for to look over whether charging tray 2 removes normally can.

As shown in fig. 6, as optimization of the embodiment, considering the influence of 4 reversing mechanism structures on the conveying of the material tray 2, and the material tray 2 is in a high-temperature state, the first reversing mechanism 12 includes a support frame 16, bearing blocks 17 are fixed on the support frame 16 through bolts, the bearing blocks 17 are arranged at equal intervals, a steel roller 18 is rotatably connected between the opposite bearing blocks 17, and the conveying direction of the steel roller 18 is the same as the conveying direction of the roller kiln 1; as shown in fig. 7, the upper surface of the steel roller 18 is higher than the upper surface of the bearing block 17, so that the charging tray 2 can be stably moved from the chain 9 to the steel roller 18, as shown in fig. 8, the upper surface of the steel roller 18 is flush with the upper surface of the roller kiln 1, and the charging tray 2 can be stably moved from the roller to the steel roller 18; a gap 19 is reserved between the adjacent steel rollers 18, the gap 19 is used for arranging the chain 9, the preferable rack 6 is fixed on the support frame 16, and the shaft ends of the steel rollers 18 are connected with a second motor 20 through chain transmission; the second reversing mechanism 13, the third reversing mechanism 14 and the fourth reversing mechanism 15 have the same structure as the first reversing mechanism 12; can bear charging tray 2 displacement through setting up steel roll 18 to 90 rotatory charging tray 2 direction of delivery, 18 heat resistances of steel roll are good, have guaranteed that charging tray 2 of high temperature can the switching-over be carried.

As shown in fig. 9, as an optimization of the embodiment, in consideration of the influence of the height of the support frame 16 on the conveying process, the height-adjustable supports 21 arranged in a matrix are detachably mounted on the support frame 16, and each height-adjustable support 21 includes a base plate 22, and the base plate 22 is placed on the ground and is circular in shape; a screw 23 is welded on the top surface of the chassis 22, and an upper positioning nut and a lower positioning nut 24 are screwed on the screw 23; the height of the support frame 16 can be adjusted by rotating the position of the positioning nut 24, and the steel roller 18, the chain 9 and the roller are ensured to be on the same horizontal plane.

As shown in fig. 10, as an optimization of the embodiment, considering that there is a risk in using the structure of the support frame 16, a worker is easy to twist in the steel roller 18 or the chain 9, a protection plate 25 is fixed to the periphery of the support frame 16 by bolts, the protection plate 25 is made of a stainless steel plate, the protection plate 25 can be painted with a striking yellow color for easy identification, the worker can be separated by arranging the protection plate 25, and the safety of production is improved.

As shown in fig. 11, as an optimization of the embodiment, considering that the charging tray 2 needs to move along the chain 9 again after reversing, the supporting frame 16 is welded with two suspension beams 26, the suspension beams 26 are parallel to the horizontal plane, the suspension beams 26 are welded with vertical rods 27 which are upward and vertical, the vertical rods 27 penetrate through the gap 19 and are connected with the baffle 28, as shown in fig. 12, the baffle 28 is located above the steel roller 18, the baffle 28 is L-shaped, the moving position of the charging tray 2 can be controlled by arranging the suspension beams 26, and the central line of the charging tray 2 is ensured to coincide with the central line of the chain 9 after the charging tray 2 contacts the baffle 28; the vertical rods 27 are arranged, so that the baffle 28 can be suspended, and the baffle 28 is prevented from blocking the rotation of the steel roller 18; the baffle 28 is arranged to ensure that the tray 2 continues to move along the chain 9 after being changed.

Example two

As shown in fig. 13, different from the first embodiment, in consideration of the position of the baffle 28 being not adjustable, since the baffle 28 is installed at a different position, separate blanking is required, and the production cost is high, the top surface of the suspension beam 26 is processed with a sliding groove 29, and the cross section of the sliding groove 29 is in a convex shape; the vertical rod 27 is a stud, the tail part of the vertical rod 27 slides in the sliding groove 29, the side wall of the vertical rod 27 is in threaded connection with a first limiting nut 30, and the vertical rod 27 and the suspension beam 26 are fixed by screwing the first limiting nut 30; the head of the vertical rod 27 penetrates through the gap 19 to be connected with a baffle 28, a horizontal section of the baffle 28 is provided with a through groove 31, as shown in fig. 14, the vertical rod 27 and the through groove 31 are fixed through two second limiting nuts 32, the position of the vertical rod 27 can be adjusted through the arrangement of the sliding groove 29, the vertical rod 27 can penetrate through the gap 19, and the structural interference is avoided; the position of the baffle 28 can be adjusted by arranging the through groove 31, so that the center line of the charging tray 2 is overlapped with the center line of the chain 9 after the charging tray 2 contacts the baffle 28; the applicability is good, and the production cost is low.

Application scenarios and working principles: in the process of producing the polishing powder by the wet method, a material tray 2 containing raw materials is placed on a roller at one end of a roller kiln 1, and the material tray 2 is sent out from the other end of the roller kiln 1 along with the continuous rotation of the roller; the second motor 20 operates to make the steel roller 18 push the tray 2 to displace; after the material tray 2 contacts the baffle 28, the second motor 20 stops, the first motor 11 runs, so that the chain 9 pushes the material tray 2 to displace, and the conveying direction of the material tray 2 rotates clockwise by 90 degrees; after the material tray 2 contacts the baffle 28, the first motor 11 stops, and the second motor 20 runs, so that the steel roller 18 pushes the material tray 2 to displace, and the conveying direction of the material tray 2 rotates clockwise by 90 degrees; when the material tray 2 is separated from the steel roller 18, the second motor 20 stops, the first motor 11 runs to enable the chain 9 to push the material tray 2 to displace, when the material tray 2 is separated from the chain 9, the first motor 11 stops, the second motor 20 runs to enable the steel roller 18 to push the material tray 2 to displace, when the material tray 2 is in contact with the baffle 28, the second motor 20 stops, the first motor 11 runs to enable the chain 9 to push the material tray 2 to displace, and the material tray 2 is caused to rotate 90 degrees clockwise in the conveying direction; after the material tray 2 contacts the baffle 28, the first motor 11 stops, the second motor 20 runs, so that the steel roller 18 pushes the material tray 2 to displace, the material tray 2 rotates clockwise by 90 degrees in the conveying direction, and the material tray 2 enters the roller kiln 1 again; this application forms the closed loop transfer chain of shape of paper money as a book, can realize the continuous conveyor of charging tray 2, and the polishing powder circulation gets into the kiln body and burns, has alleviateed workman's intensity of labour, and the production safety obtains improving.

It is to be understood that the present invention has been described with reference to certain embodiments and that various changes or equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention as defined by the appended claims. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.

Claims

1. The automatic material returning system of the heating kiln comprises a roller kiln (1), and is characterized in that a material tray (2) is placed on a roller of the roller kiln (1), the material tray (2) is square, a notch for placing polishing powder is formed in the top surface of the material tray (2), four outer side surfaces of the material tray (2) are planes, and four edges of the bottom surface of the material tray (2) are in a circular-angle shape; a first conveying mechanism (3) for driving the material tray (2) to move is arranged at the mouth of the roller kiln (1); the tail of the roller kiln (1) is provided with a second conveying mechanism (4) for driving the material tray (2) to move; a third conveying mechanism (5) for driving the material tray (2) to move is arranged in the gap between the first conveying mechanism (3) and the second conveying mechanism (4).

2. The automatic material returning system of the heating kiln, according to claim 1, characterized in that the first conveying mechanism (3) comprises a frame (6), and a rotating shaft (7) is arranged on the frame (6); the rotating shaft (7) is provided with driving chain wheels (8) which are symmetrically arranged; the driving chain wheel (8) is connected with a driven chain wheel (10) through chains (9), the upper surfaces of the chains (9) are flush with the upper surface of a roller of the roller kiln (1), the charging trays (2) can be placed on the two chains (9), and a first motor (11) is arranged at the shaft end of the rotating shaft (7); the second conveying mechanism (4) and the third conveying mechanism (5) are the same as the first conveying mechanism (3) in structure.

3. The automatic material returning system of the heating kiln, as claimed in claim 1, is characterized in that a first reversing mechanism (12) is provided at the mouth of the roller kiln (1), a second reversing mechanism (13) is provided at the tail of the roller kiln (1), a third reversing mechanism (14) and a fourth reversing mechanism (15) are provided at the outer side of the roller kiln (1), the third reversing mechanism (14) corresponds to the second reversing mechanism (13), and the fourth reversing mechanism (15) corresponds to the first reversing mechanism (12).

4. The automatic material returning system of the heating kiln is characterized in that the first reversing mechanism (12) comprises a support frame (16), bearing seats (17) are arranged on the support frame (16), the bearing seats (17) are arranged at equal intervals, a steel roller (18) is arranged between the opposite bearing seats (17), and the conveying direction of the steel roller (18) is the same as that of the roller kiln (1); the upper surface of the steel roller (18) is higher than the upper surface of the bearing seat (17), and the upper surface of the steel roller (18) is flush with the upper surface of the roller kiln (1); gaps (19) are reserved between the adjacent steel rollers (18), the gaps (19) are used for arranging the chains (9), and the shaft ends of the steel rollers (18) are provided with second motors (20); the second reversing mechanism (13), the third reversing mechanism (14) and the fourth reversing mechanism (15) are identical to the first reversing mechanism (12) in structure.

5. The automatic material returning system of the heating kiln according to claim 4, characterized in that the supporting frame (16) is provided with height-adjusting supports (21) arranged in a matrix, the height-adjusting supports (21) comprise a chassis (22), and the chassis (22) is placed on the ground; the top surface of the chassis (22) is provided with a screw rod (23), and the screw rod (23) is screwed with an upper positioning nut and a lower positioning nut (24).

6. An automatic material return system for a heating kiln according to claim 4, wherein the support frame (16) is provided with a protective plate (25) at its periphery.

7. The automatic material returning system of the heating kiln according to claim 4, wherein the supporting frame (16) is provided with a cantilever beam (26), and the cantilever beam (26) is parallel to the horizontal plane; a vertical rod (27) is arranged on the suspension beam (26), the vertical rod (27) penetrates through the gap (19) and is connected with a baffle (28), the baffle (28) is located above the steel roller (18), and the baffle (28) is L-shaped.

8. The automatic material returning system for a heating kiln according to claim 7, wherein the top surface of the suspension beam (26) is provided with a chute (29); the vertical rod (27) is of a stud structure, the tail part of the vertical rod (27) slides in the sliding groove (29), the side wall of the vertical rod (27) is in threaded connection with a first limiting nut (30), and the vertical rod (27) and the suspension beam (26) are fixed by screwing the first limiting nut (30); the head of the vertical rod (27) penetrates through the gap (19) to be connected with a baffle (28), a through groove (31) is formed in the horizontal section of the baffle (28), and the vertical rod (27) and the through groove (31) are fixed through two second limiting nuts (32).