Feeding device of heating furnace

Abstract

The invention discloses a heating furnace feeding device, and relates to the technical field of heating furnaces. The metal part conveying device comprises a mounting frame, a conveying part is mounted on the mounting frame, the conveying part is provided with a feeding end and a discharging end, and the conveying part is used for conveying metal parts from the feeding end to the discharging end. The conveying part is mounted on the mounting frame, the cutting part is mounted at the feeding end of the conveying part, the metal parts are firstly sheared into small particles, the small particles enter the feeding end of the conveying part from the discharging part, and when the metal parts are conveyed to the discharging end, the metal parts are limited by sliding of the material distributing part, so that the metal parts are conveyed to the feeding end of the conveying part; when the blocking part of the material distributing part relieves shielding of the discharging end, the metal pieces can pass through the discharging end, when the material distributing part shields the discharging end, the metal pieces are shielded by the blocking part, and in the feeding process of the device, the metal pieces can be cut and conveyed in batches, so that the metal pieces enter a heating furnace in batches; and the metal piece can be evenly heated, and the practicability of the device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of heating furnaces, and in particular to a charging device for a heating furnace. Background Art

[0002] In the metallurgical industry, a heating furnace is a device that heats materials or metal workpieces to rolling or forging temperature. In the heating process of metal workpieces, such as aluminum bars, the raw materials need to be placed in a heating furnace for heating and melting. The general heating and melting process often requires the metal parts to be transported to the heating furnace for processing through a loading device.

[0003] In the prior art, when aluminum bars are heated and processed, they are directly transported through a loading device. However, the existing loading devices are mostly conveyor belts, which can only play a transportation effect during transportation. However, the heating of the entire aluminum bar is poor, and it is impossible to cut it during transportation, resulting in poor subsequent heating effect. For this reason, the present application provides a heating furnace loading device to improve this problem. Summary of the invention

[0004] The purpose of this application is to solve the problems in the above-mentioned background technology, and provide a heating furnace charging device.

[0005] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0006] The heating furnace charging device comprises:

[0007] A mounting frame, on which a transport piece is mounted, the transport piece having a loading end and a unloading end, and the transport piece is used to transport the metal piece from the loading end to the unloading end;

[0008] The cutting member is mounted on the mounting frame, and comprises a driving part and a feeding part, wherein the feeding part is connected to the feeding end of the transport member, and the driving part is connected to the feeding end of the transport member, and when the transport member is working, the driving part is moved close to or away from the feeding part;

[0009] The material dividing piece is installed on the mounting frame. The material dividing piece has a connecting part and a blocking part. The connecting part is connected to the loading end of the transport piece, and the blocking part is located at the unloading end of the transport piece. When the transport piece is in use, the connecting part drives the blocking part to cover or release the unloading end of the transport piece.

[0010] Furthermore, the transport parts include:

[0011] A front fixed plate is mounted on a mounting frame, a middle fixed plate is mounted on the mounting frame, rollers are rotatably mounted on the front fixed plate and the middle fixed plate, and an upper conveyor belt is arranged on a transmission sleeve between the rollers;

[0012] The rear fixed plate is mounted on the mounting frame, and a rotating roller is also rotatably mounted on the rear fixed plate. There are two rotating rollers on the middle fixed plate, one of which is connected with the upper conveyor belt, and a lower conveyor belt is sleeved between the other and the rotating roller on the rear fixed plate.

[0013] Furthermore, the cutting element comprises:

[0014] A carrying plate is mounted on a mounting frame, an extrusion plate is slidably mounted on the mounting frame, a blade plate is mounted on the carrying plate and the extrusion plate, the carrying plate is meshed with the blade plate on the extrusion plate, the carrying plate is located above the upper conveyor belt, and a through hole for metal parts to pass through is opened on the carrying plate;

[0015] The connecting frame is installed on the extrusion plate, and the connecting frame is slidably connected with the mounting frame. The rotating roller on the front fixed plate is hinged with a hinge rod, and the free end of the hinge rod is hinged with the connecting frame.

[0016] Furthermore, the material dividing piece comprises:

[0017] A partition plate is slidably mounted on the mounting frame, an extension plate is mounted on the partition plate, and the partition plate is located above the lower conveyor belt;

[0018] The driving gear is coaxially connected to the rotating roller on the middle fixed plate. A transmission gear meshing with the driving gear is installed on the mounting frame. The diameter of the transmission gear is larger than the driving gear. A driving rod is hinged on the transmission gear, and the free end of the driving rod is hinged to the extension plate.

[0019] Furthermore, the mounting frame is provided with baffles on both sides of the lower conveyor belt, the baffles are used to shield both sides of the lower conveyor belt, and the partition plate is slidably matched with the baffles.

[0020] Furthermore, a mounting plate is hinged on the baffle, waist holes are opened at both ends of the mounting plate, a sliding rod movably matched with one of the waist holes is installed on the partition, and a sub-plate is slidably installed on the baffle, and the sub-plate is movably matched with the other waist hole.

[0021] Furthermore, a plurality of convex plates are installed on the upper conveyor belt, and a cavity for accommodating metal parts is formed between adjacent convex plates, and the side surface of the convex plate facing the cavity is an inclined surface.

[0022] Furthermore, a plurality of surface extension rods are mounted on the connecting frame, and accommodating holes for accommodating the surface extension rods are provided on the mounting frame.

[0023] Furthermore, a circular plate is mounted on the rotating roller, the diameter of the circular plate is larger than the diameter of the rotating roller, and the hinged rod is hinged to the circular plate.

[0024] Furthermore, the end surfaces of the partition plate and the auxiliary plate facing the lower conveyor belt are both arc-shaped surfaces.

[0025] The beneficial effects of this application are as follows:

[0026] The present application has a transport piece installed on a mounting frame, and a cutting piece installed at the loading end of the transport piece. The metal piece is first sheared into smaller particles, and then enters the loading end of the transport piece from the unloading part. When the metal piece is transported to the unloading end, it is restricted by the sliding of the dividing piece. When the blocking part of the dividing piece releases the obstruction of the unloading end, the metal piece can pass through the unloading end. When the dividing piece blocks the unloading end, the metal piece is blocked by the blocking part. During the loading process of the device, the metal pieces can be cut and transported in batches, so that the metal pieces enter the heating furnace in batches, so that the metal pieces can be evenly heated, thereby increasing the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of this application;

[0028] Figure 2 It is a schematic diagram of the transport structure of this application;

[0029] Figure 3 It is a schematic diagram of the material distribution structure of this application;

[0030] Figure 4 This is a schematic diagram of the structure of the partition and baffle of the present application;

[0031] Figure 5 It is an exploded view of some structures of this application;

[0032] Figure 6 This is an exploded view of the cutting machine structure of this application;

[0033] 1. Mounting frame; 2. Transport part; 201. Front fixed plate; 202. Middle fixed plate; 203. Roller; 204. Upper conveyor belt; 205. Rear fixed plate; 206. Lower conveyor belt; 3. Cutting part; 301. Loading plate; 302. Extrusion plate; 303. Blade plate; 304. Connecting frame; 305. Articulated rod; 306. Through hole; 4. Material dividing part; 401. Partition plate; 402. Extension plate; 403. Driving gear; 404. Transmission gear; 405. Driving rod; 5. Baffle; 6. Mounting plate; 7. Waist hole; 8. Sliding rod; 9. Sub-plate; 10. Convex plate; 11. Receptacle; 12. Surface extension rod; 13. Accommodating hole; 14. Round plate; 15. Vertical plate. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0035] Embodiment 1

[0036] like Figure 1-Figure 6 As shown, the heating furnace charging device proposed in the first embodiment of the present application includes:

[0037] The mounting frame 1 is provided with a transport member 2, which has a loading end and a unloading end. The transport member 2 is used to transport the metal member from the loading end to the unloading end. The unloading end of the transport member 2 is connected to the heating furnace, so that when the loading end transports the metal member to the unloading end, the metal member can be sent to the heating furnace through the unloading end for heating;

[0038] The cutting member 3 is mounted on the mounting frame 1. The cutting member 3 has a driving part and a feeding part. The feeding part is communicated with the feeding end of the transport member 2. The driving part is connected with the feeding end of the transport member 2. When the transport member 2 is working, the driving part is moved close to or away from the feeding part. When in use, when the driving part is close to the feeding part, the driving part cuts the metal part. After the cutting is completed, the cut metal part is transported by the transport member 2 at the feeding end through the feeding part.

[0039] The dividing member 4 is installed on the mounting frame 1. The dividing member 4 has a connecting portion and a blocking portion. The connecting portion is connected to the loading end of the transport member 2, and the blocking portion is located at the unloading end of the transport member 2. When the transport member 2 is in use, the connecting portion drives the blocking portion to block or release the unloading end of the transport member 2. When the blocking portion of the dividing member 4 blocks the unloading end, the metal parts are blocked by the dividing member 4, and the transport member 2 will not transport the metal parts. When the blocking portion releases the blocking, the transport member 2 can continue to transport the metal parts, so that the metal parts can enter the heating furnace in batches.

[0040] This device is suitable for softer metal parts such as aluminum bars or copper bars;

[0041] Compared with the existing technology, a transport part 2 is installed on the mounting frame 1, and a cutting part 3 is installed at the loading end of the transport part 2. The metal parts are first sheared into smaller particles and enter the loading end of the transport part 2 from the unloading part. When the metal parts are transported to the unloading end, they are restricted by the sliding of the dividing part 4. When the blocking part of the dividing part 4 releases the obstruction to the unloading end, the metal parts can pass through the unloading end. When the dividing part 4 blocks the unloading end, the metal parts are blocked by the blocking part. During the loading process of the device, the metal parts can be cut and transported in batches, so that the metal parts enter the heating furnace in batches, so that the metal parts can be evenly heated, thereby increasing the practicality of the device.

[0042] Embodiment 2

[0043] like Figure 1-Figure 6 As shown, the second embodiment discloses the transporting member 2, the cutting member 3 and the material dividing member 4 on the basis of the first embodiment. In the second embodiment, the transporting member 2 includes:

[0044] The front fixing plate 201 is mounted on the mounting frame 1, and the mounting frame 1 is mounted with a middle fixing plate 202. Rollers 203 are rotatably mounted on the front fixing plate 201 and the middle fixing plate 202. An upper conveyor belt 204 is provided on a transmission sleeve between the rollers 203. The upper conveyor belt 204 is a feeding end. When in use, the rollers 203 can be driven by a motor.

[0045] The rear fixed plate 205 is mounted on the mounting frame 1. The rear fixed plate 205 is also rotatably mounted with a roller 203. There are two rollers 203 on the middle fixed plate 202, one of which is connected to the upper conveyor belt 204. A lower conveyor belt 206 is sleeved between the other roller and the roller 203 on the rear fixed plate 205. The lower conveyor belt 206 is the unloading end. The height of the roller 203 on the middle fixed plate 202 connected to the upper conveyor belt 204 is higher than the other roller, so that the height of the lower conveyor belt 206 is lower than The height of the upper conveyor belt 204, the transport direction of the transport part 2 is from the front fixed plate 201 to the middle fixed plate 202 and then to the rear fixed plate 205. When in use, after the metal part is cut by the cutting part 3, it falls onto the upper conveyor belt 204 and is transported by the upper conveyor belt 204. When it is transported to the middle fixed plate 202, it falls onto the lower conveyor belt 206 by gravity, and is then transported to the heating furnace by the lower conveyor belt 206 to complete the transportation of the metal part.

[0046] In the second embodiment, the cutting element 3 comprises:

[0047] The bearing plate 301 is mounted on the mounting frame 1, and the mounting frame 1 is slidably mounted with an extrusion plate 302. The bearing plate 301 and the extrusion plate 302 are mounted with a blade plate 303. The blade plates 303 on the bearing plate 301 and the extrusion plate 302 are meshed. When in use, a metal piece is placed between the bearing plate 301 and the extrusion plate 302. When the extrusion plate 302 slides close to the bearing plate 301, the blade plate 303 extrudes and shears the metal piece into multiple sections.

[0048] The carrying plate 301 is located above the upper conveyor belt 204. A through hole 306 is provided on the carrying plate 301 for the metal pieces to pass through. The carrying plate 301 and the through hole 306 are a material discharge portion. When the metal pieces are cut into multiple sections, their volume is reduced. Under the action of gravity, they fall through the through hole 306 onto the upper conveyor belt 204 and are transported by the upper conveyor belt 204.

[0049] The connecting frame 304 is installed on the extrusion plate 302, and the connecting frame 304 is slidably connected to the mounting frame 1. The roller 203 on the front fixed plate 201 is hinged with a hinge rod 305, and the free end of the hinge rod 305 is hinged to the connecting frame 304. The extrusion plate 302, the connecting frame 304 and the hinge rod 305 are driving parts. When in use, when the transport member 2 is working, a crank connecting rod structure is formed between the roller 203, the hinge rod 305 and the connecting frame 304, and the roller 203 rotates, driving the hinge rod 503 to change its position in the vertical direction, so that the hinge rod 305 first pushes the connecting frame 304 and the extrusion plate 302 away from the supporting plate 301, and then pulls the connecting frame 304 and the extrusion plate 302 close to the supporting plate 301, so that the blade plate 303 cuts the metal rod, reduces the volume of the metal rod, and makes the metal parts heated more evenly when being heated in the heating furnace.

[0050] In the second embodiment, the material dividing member 4 comprises:

[0051] The partition 401 is slidably mounted on the mounting frame 1, and an extension plate 402 is mounted on the partition 401. The partition 401 is located above the lower conveyor belt 206, and the partition 401 is perpendicular to the upper surface of the lower conveyor belt 206. When the partition 401 is close to the lower conveyor belt 206, it is used to cut off the transportation path of the lower conveyor belt 206. At this time, the lower conveyor belt 206 is slidably matched with the bottom of the partition 401, and can continue to operate from the bottom of the partition 401, but the metal parts transported thereon are blocked by the partition 401 and cannot be driven by the lower conveyor belt 206. The partition 401 is a blocking part;

[0052] The driving gear 403 is coaxially connected to the roller 203 on the middle fixed plate 202. A transmission gear 404 meshing with the driving gear 403 is installed on the mounting frame 1. The diameter of the transmission gear 404 is larger than that of the driving gear 403. A driving rod 405 is hinged on the transmission gear 404. The free end of the driving rod 405 is hinged to the extension plate 402. The driving gear 403, the transmission gear 404 and the driving rod 405 are connecting parts. When in use, the transmission gear 404, the driving rod 405 and the extension plate 402 form a crank connecting rod structure. When the transport member 2 is working, the driving gear 403 is driven to rotate, and then the transmission gear 404 is driven to rotate, so that the transmission gear 404 drives the driving rod 405 to change its position in the vertical direction, and then the driving rod 405 drives the partition 401 to move closer to or away from the lower conveyor belt 206;

[0053] Among them, the roller 203 connected to the transmission gear 404 is the roller 203 connected to the upper conveyor belt 204, so that the rotation speed of the transmission gear 404 is synchronized with the roller 203, and when in use, the small gear drives the large gear to slow down, so that the frequency of the reciprocating motion of the partition 401 is less than the movement frequency of the extrusion plate 302, so that when the cut metal parts are transported to the partition 401, they will be blocked by the partition 401 for transportation and piled up. When the partition 401 moves, the batch of metal parts is transported, and the partition 401 approaches or moves away from the lower conveyor belt 206, so that the cut metal parts enter the heating furnace in batches, which is convenient for small-scale concentration of scattered metal parts, and convenient for subsequent heating operations, thereby increasing the practicality of the device.

[0054] When in use, the distance between the partition 401 and the upper conveyor belt 204 is extended by the extension plate 402, which reduces the influence of the partition 401 on the movement of the upper conveyor belt 204 and increases the rationality of the installation of the partition 401.

[0055] Embodiment 3

[0056] like Figure 1-Figure 6 As shown, the third embodiment further discloses the present application on the basis of the second embodiment. In the third embodiment, the mounting frame 1 is provided with baffles 5 on both sides of the lower conveyor belt 206. The baffles 5 are used to block the two sides of the lower conveyor belt 206. The partition 401 slides with the baffles 5. When the metal parts fall from the upper conveyor belt 204 to the lower conveyor belt 206, the two sides of the lower conveyor belt 206 are blocked by the baffles 5, thereby reducing the possibility of the metal parts being bounced to the outside of the device by the reaction force after falling, thereby reducing the loss of the metal parts.

[0057] In the third embodiment, a mounting plate 6 is hinged on the baffle plate 5, and waist holes 7 are provided at both ends of the mounting plate 6. A slide bar 8 that is movably matched with one of the waist holes 7 is installed on the partition plate 401. A sub-plate 9 is slidably installed on the baffle plate 5, and the sub-plate 9 is movably matched with the other waist hole 7. The slide bar 8 can rotate and slide in the waist hole 7. A rod body is installed on the sub-plate 9, and the rod body can also slide and rotate in the waist hole 7. A vertical plate 15 is installed on the mounting frame 1, and the mounting plate 6 is hinged on the vertical plate 15. The hinge position is in the middle position of the mounting plate 6, so that the mounting plate 6 The lever structure is formed so that when the partition 401 is away from the lower conveyor belt 206, the other end of the mounting plate 6 falls, so that the sub-plate 9 is close to the lower conveyor belt 206, so that when the partition 401 rises, the sub-plate 9 blocks the metal parts being transported at this time, so that the metal parts can be better gathered into smaller piles of metal parts. When the partition 401 is close to the lower conveyor belt 206, the sub-plate 9 rises and releases the metal parts that have just been blocked, allowing them to enter the heating furnace, and the metal parts are divided into small batches and enter the heating furnace to facilitate subsequent heating.

[0058] In the third embodiment, a plurality of convex plates 10 are installed on the upper conveyor belt 204, and a cavity 11 for accommodating metal parts is formed between adjacent convex plates 10. The side surface of the convex plate 10 facing the cavity 11 is an inclined surface. When the metal parts are cut and fall onto the upper conveyor belt 204, they are initially stacked in the cavity 11. When the metal parts fall onto the convex plate 10, the inclined surface on the convex plate 10 guides the metal parts to the adjacent cavity 11, thereby increasing the practicability of the device.

[0059] In embodiment three, a plurality of surface extension rods 12 are installed on the connecting frame 304, and a receiving hole 13 for receiving the surface extension rod 12 is opened on the mounting frame 1. When the connecting frame 304 slides, the surface extension rod 12 slides in the receiving hole 13. The contact between the outer wall of the surface extension rod 12 and the inner wall of the receiving hole 13 increases the contact area between the connecting frame 304 and the mounting frame 1, thereby increasing the stability of the connecting frame 304 when sliding.

[0060] In the third embodiment, a circular plate 14 is installed on the roller 203, and the diameter of the circular plate 14 is larger than the diameter of the roller 203. The hinged rod 305 is hinged to the circular plate 14. The design that the diameter of the circular plate 14 is larger than the roller 203 increases the movement path of the hinged rod 305, thereby increasing the activity path of the extrusion plate 302 driven by the hinged rod 305, thereby increasing the maximum distance between the extrusion plate 302 and the supporting plate 301, and can adapt to metal parts of different thicknesses, thereby increasing the practicality of the device.

[0061] In embodiment three, the end faces of the partition plate 401 and the sub-plate 9 facing the lower conveyor belt 206 are both arc-shaped surfaces. When in use, the arc-shaped surfaces reduce the contact area between the partition plate 401 and the lower conveyor belt 206, thereby reducing the friction between the partition plate 401 and the lower conveyor belt 206, and reducing the impact on the movement of the lower conveyor belt 206 when the partition plate 401 or the sub-plate 9 contacts the lower conveyor belt 206.

[0062] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heating furnace charging device, characterized in that: include: A mounting frame (1) on which a transport member (2) is mounted, wherein the transport member (2) has a loading end and a unloading end, and the transport member (2) is used to transport the metal member from the loading end to the unloading end; The cutting member (3) is mounted on the mounting frame (1), and comprises a driving part and a material discharging part, wherein the material discharging part is connected to the material discharging end of the transport member (2), and the driving part is connected to the material discharging end of the transport member (2). When the transport member (2) is in operation, the driving part is moved close to or away from the material discharging part; The material dividing member (4) is mounted on the mounting frame (1), and comprises a connecting portion and a blocking portion, wherein the connecting portion is connected to the loading end of the transport member (2), and the blocking portion is located at the unloading end of the transport member (2). When the transport member (2) is in use, the connecting portion drives the blocking portion to block or release the unloading end of the transport member (2).

2. The heating furnace charging device according to claim 1, characterized in that: Transport parts (2) include: A front fixing plate (201) is mounted on a mounting frame (1), a middle fixing plate (202) is mounted on the mounting frame (1), rollers (203) are rotatably mounted on the front fixing plate (201) and the middle fixing plate (202), and an upper conveyor belt (204) is provided on a transmission sleeve between the rollers (203); The rear fixed plate (205) is mounted on the mounting frame (1), and a roller (203) is also rotatably mounted on the rear fixed plate (205). There are two rollers (203) on the middle fixed plate (202), one of which is connected to the upper conveyor belt (204), and a lower conveyor belt (206) is sleeved between the other roller (203) on the rear fixed plate (205).

3. The heating furnace charging device according to claim 2, characterized in that: The cutting element (3) comprises: A carrying plate (301) is mounted on a mounting frame (1), an extrusion plate (302) is slidably mounted on the mounting frame (1), a blade plate (303) is mounted on the carrying plate (301) and the extrusion plate (302), the carrying plate (301) and the blade plate (303) on the extrusion plate (302) are meshed, the carrying plate (301) is located above the upper conveyor belt (204), and a through hole (306) for metal parts to pass through is opened on the carrying plate (301); The connecting frame (304) is mounted on the extrusion plate (302), and the connecting frame (304) is slidably connected to the mounting frame (1). A hinged rod (305) is hinged on the rotating roller (203) on the front fixed plate (201), and a free end of the hinged rod (305) is hinged to the connecting frame (304).

4. The heating furnace charging device according to claim 3, characterized in that: The material dividing member (4) comprises: A partition (401) is slidably mounted on the mounting frame (1), an extension plate (402) is mounted on the partition (401), and the partition (401) is located above the lower conveyor belt (206); The driving gear (403) is coaxially connected to the rotating roller (203) on the middle fixed plate (202); a transmission gear (404) meshing with the driving gear (403) is installed on the mounting frame (1); the diameter of the transmission gear (404) is larger than that of the driving gear (403); a driving rod (405) is hinged on the transmission gear (404); and a free end of the driving rod (405) is hinged to the extension plate (402).

5. The heating furnace charging device according to claim 4, characterized in that: The mounting frame (1) is provided with baffles (5) on both sides of the lower conveyor belt (206), the baffles (5) being used to shield both sides of the lower conveyor belt (206), and the partition (401) is slidably matched with the baffles (5).

6. The heating furnace charging device according to claim 5, characterized in that: The baffle (5) is hingedly connected with a mounting plate (6), and waist holes (7) are provided at both ends of the mounting plate (6). A sliding rod (8) movably matched with one of the waist holes (7) is installed on the partition (401), and a sub-plate (9) is slidably installed on the baffle (5), and the sub-plate (9) movably matches with the other waist hole (7).

7. The heating furnace charging device according to claim 6, characterized in that: A plurality of convex plates (10) are installed on the upper conveyor belt (204), a cavity (11) for accommodating metal parts is formed between adjacent convex plates (10), and the side surface of the convex plate (10) facing the cavity (11) is an inclined surface.

8. The heating furnace charging device according to claim 7, characterized in that: A plurality of surface extension rods (12) are mounted on the connecting frame (304), and a receiving hole (13) for receiving the surface extension rods (12) is provided on the mounting frame (1).

9. The heating furnace charging device according to claim 8, characterized in that: A circular plate (14) is mounted on the rotating roller (203), the diameter of the circular plate (14) is larger than the diameter of the rotating roller (203), and the hinge rod (305) is hinged to the circular plate (14).

10. The heating furnace charging device according to claim 9, characterized in that: The end surfaces of the partition plate (401) and the auxiliary plate (9) facing the lower conveyor belt (206) are both arc-shaped surfaces.

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