Feeding mechanism for high-performance aluminum alloy production

Abstract

The utility model discloses a feeding mechanism for high-performance aluminum alloy production, and relates to the technical field of aluminum alloy production. The base is in a U shape; the bottom end of the outer wall of the base is fixedly connected with a pair of stand columns. One side of the outer wall of the base is fixedly connected with a motor through a first square plate; raw materials are placed in the raw material box, then the motor drives the rotating shaft to rotate, the rotating shaft drives the conveying belt and the rotating rollers to rotate, the raw materials in the raw material box fall onto the conveying belt from the discharging opening through the discharging piece, the raw materials move on the conveying belt, and when the raw materials move to the guiding plate, the raw materials are scraped by the guiding plate. According to the automatic feeding device for the aluminum alloy production equipment, manual continuous feeding is not needed, so that the labor intensity of workers is reduced, meanwhile, the workers do not need to make contact with raw materials for a long time, and the body health of the workers is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum alloy production, in particular to a feeding mechanism for high-performance aluminum alloy production. Background Art

[0002] Aluminum alloy is an alloy based on aluminum with a certain amount of other alloying elements added. It is one of the light metal materials with the advantages of light weight, high strength, and good processing performance. Compared with ordinary aluminum alloys, high-performance aluminum alloys have higher strength indicators, corrosion resistance, wear resistance, and tensile strength, making high-performance aluminum alloys commonly used in aviation, automobiles, ships and other fields.

[0003] When high-performance aluminum alloys in the prior art are produced and processed, raw materials need to be added or put into aluminum alloy production equipment such as a melting furnace. The addition or input of raw materials mostly relies on manual addition. When manual feeding is performed for a long time, it not only increases the workload of the staff, but also long-term contact with the raw materials of high-performance aluminum alloys will cause damage to the health of the staff.

[0004] In view of the above technical problems, this application proposes a solution. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that in the prior art, when high-performance aluminum alloys are produced and processed, raw materials need to be added or put into aluminum alloy production equipment such as a melting furnace, and the addition or input of raw materials mostly relies on manual addition, which makes the manual addition for a long time not only increase the work intensity of the staff, but also long-term contact with the raw materials of the high-performance aluminum alloy will cause damage to the health of the staff. A feeding mechanism for the production of high-performance aluminum alloys is proposed.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A feeding mechanism for the production of high-performance aluminum alloys, comprising a base; the base is U-shaped; a pair of columns are fixedly connected to the bottom end of the outer wall of the base; a motor is fixedly connected to one side of the outer wall of the base through a first square plate; a rotating shaft is provided at the output end of the motor, and one end of the outer wall of the rotating shaft passes through the base; a raw material box is fixedly connected to the top end of the outer wall of the base through a pair of second square plates; the top end of the outer wall of the raw material box is open, and a feeding port is fixedly connected to the bottom end of the outer wall of the raw material box, and the feeding port is connected to the raw material box; a feeding piece is provided on the inner side wall of the feeding port; the feeding piece comprises a rotating rod; a rotating roller is rotatably connected to the inner side wall of the base; the rotating roller and the rotating shaft are driven by a conveyor belt; a guide plate is fixedly connected to the inner side wall of the base, and one end of the outer wall of the guide plate is in contact with the conveyor belt.

[0008] Preferably, one end of the outer wall of the rotating rod is rotatably connected to one side of the inner wall of the discharge port, and the other end of the outer wall of the rotating rod passes through the discharge port and the second square plate; one end of the outer wall of the rotating rod and the rotating shaft are fixedly connected to the first sprocket, and a pair of first sprockets are connected by a first chain; a group of quantitative plates are fixedly connected to the outer wall of one end of the rotating rod located in the discharge port, and the quantitative plates match the discharge port.

[0009] Preferably, the outer wall of one end of the rotating shaft that does not pass through the base is fixedly connected to the first bevel gear; one side of the outer wall of the base is rotatably connected to a circular rod through a third party plate; the second bevel gear and the third bevel gear are respectively fixedly connected to the outer wall of the circular rod at both ends, and the second bevel gear and the first bevel gear are meshed with each other; the first rotating rod and the second rotating rod are rotatably connected to the opposite sides of the outer wall of the base through square plates; the outer wall of the first rotating rod is fixedly connected to the fourth bevel gear, and the fourth bevel gear and the third bevel gear are meshed with each other; the bottom ends of the outer walls of the first rotating rod and the second rotating rod are fixedly connected to the fifth gear, and the pair of fifth gears are meshed with each other; a pair of concave through grooves are opened at the top end of the outer wall of the base; the top ends of the outer walls of the first rotating rod and the second rotating rod are fixedly connected to auxiliary rods, and the pair of auxiliary rods are respectively located in the pair of concave through grooves.

[0010] Preferably, a cross groove is formed on the outer side wall of the auxiliary rod; an adjustment block is provided in the cross groove; a group of auxiliary blocks are fixedly connected to the outer side wall of the adjustment block via a group of springs; and the outer side walls of a group of auxiliary blocks are in contact with the inner side wall of the cross groove.

[0011] Preferably, the outer wall of the adjustment block is slidably connected to the inner wall of the cross groove; the top end of the outer wall of the adjustment block is rotatably connected to a threaded rod, and the top end of the outer wall of the threaded rod passes through the auxiliary rod, and the threaded rod is threadedly connected to the auxiliary rod; one end of the outer wall of the auxiliary block is arc-shaped.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. By rotating the rotating shaft, since the rotating rod and one end of the outer wall of the rotating shaft are fixedly connected with the first sprocket, and the pair of first sprockets are connected by the first chain, the rotation of the rotating shaft drives the rotating rod to rotate through the pair of first sprockets and the first chain. Since a group of quantitative plates are fixedly connected to the outer wall of the rotating rod, the rotation of the rotating rod will drive the quantitative plates to rotate, thereby achieving the effect of quantitative unloading, so that the device can automatically and continuously add materials while ensuring stable operation and improving production efficiency.

[0014] 2. An adjusting block is arranged in the cross groove on the auxiliary rod, and the adjusting block is provided with a group of auxiliary blocks through a group of springs, so that when the auxiliary rod assists in conveying raw materials, the auxiliary block can be extended and retracted through the spring, so that when the auxiliary rod assists in conveying raw materials, raw materials of various widths can be conveyed. Through the self-extension adjustment of the auxiliary block, the conveying assistance range of the device is increased, making the device more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 It is a partial structural schematic diagram of the main body of the utility model;

[0018] Figure 3 It is a schematic diagram of the explosion structure of the feeding port, the rotating rod and the quantitative plate of the utility model;

[0019] Figure 4 It is a structural schematic diagram of the rotating shaft, the circular rod, the first rotating rod and the auxiliary rod of the utility model;

[0020] Figure 5 It is a schematic diagram of the exploded structure of the auxiliary rod, the auxiliary block and the threaded rod of the utility model;

[0021] In the figure: 1. base; 2. column; 3. motor; 4. rotating shaft; 5. raw material box; 6. discharge port; 7. rotating rod; 8. rotating roller; 9. conveyor belt; 10. first sprocket; 11. first chain; 12. quantitative plate; 13. first bevel gear; 14. round rod; 15. second bevel gear; 16. third bevel gear; 17. first rotating rod; 18. second rotating rod; 19. fourth bevel gear; 20. fifth gear; 21. concave groove; 22. auxiliary rod; 23. cross groove; 24. adjustment block; 25. auxiliary block; 26. threaded rod; 27. guide plate. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-Figure 5As shown, a feeding mechanism for high-performance aluminum alloy production comprises a base 1; the base 1 is U-shaped; a pair of columns 2 are fixedly connected to the bottom end of the outer wall of the base 1; a motor 3 is fixedly connected to one side of the outer wall of the base 1 through a first square plate; a rotating shaft 4 is provided at the output end of the motor 3, and one end of the outer wall of the rotating shaft 4 passes through the base 1; a raw material box 5 is fixedly connected to the top of the outer wall of the base 1 through a pair of second square plates; the top of the outer wall of the raw material box 5 is open, and a feed opening 6 is fixedly connected to the bottom end of the outer wall of the raw material box 5, and the feed opening 6 is connected to the raw material box 5; a feed piece is provided on the inner side wall of the feed opening 6; the feed piece comprises a rotating rod 7; a rotating roller 8 is rotatably connected to the inner side wall of the base 1; the rotating roller 8 and the rotating shaft 4 are driven by a conveyor belt 9; the inner side wall of the base 1 is fixed A guide plate 27 is connected, and one end of the outer wall of the guide plate 27 is in contact with the conveyor belt 9. By placing the raw material in the raw material box 5, and then driving the rotating shaft 4 to rotate by the motor 3, the rotation of the rotating shaft 4 drives the transmission belt and the rotating roller 8 to rotate. The raw material in the raw material box 5 will drop from the unloading port 6 to the conveyor belt 9 through the unloading piece, so that the raw material moves on the conveyor belt 9. When the raw material moves to the guide plate 27, it will be scraped by the guide plate 27, and then move to the guide plate 27, and fall from the guide plate 27 to the aluminum alloy production equipment such as the melting furnace, so that the device does not need to be manually continuously added, and the raw material only needs to be poured into the raw material box 5, thereby reducing the labor intensity of the staff and making the staff do not need to contact high High-performance aluminum alloy raw materials, thereby ensuring the health of the staff, and one end of the outer wall of the rotating rod 7 is rotatably connected to one side of the inner wall of the unloading port 6, and the other end of the outer wall of the rotating rod 7 passes through the unloading port 6 and the second square plate; one end of the outer wall of the rotating rod 7 and the rotating shaft 4 are fixedly connected with a first sprocket 10, and a pair of first sprockets 10 are connected by a first chain 11; a group of quantitative plates 12 are fixedly connected to the outer wall of one end of the rotating rod 7 located in the unloading port 6, and the quantitative plates 12 match the unloading port 6, and rotate through the rotating shaft 4, because the rotating rod 7 and the outer wall of the rotating shaft 4 are fixedly connected with a first sprocket 10, and a pair of first sprockets 10 are connected by a first chain 11, so that the rotation of the rotating shaft 4 is achieved through a pair of first sprockets 10 and the first The chain 11 drives the rotating rod 7 to rotate. Since a group of quantitative plates 12 are fixedly connected to the outer wall of the rotating rod 7, the rotation of the rotating rod 7 will drive the quantitative plates 12 to rotate, thereby achieving the effect of quantitative feeding, so that the device can automatically and continuously add materials while ensuring stable operation and improving production efficiency. A first bevel gear 13 is fixedly connected to the outer wall of the end of the rotating shaft 4 that does not pass through the base 1; a circular rod 14 is rotatably connected to one side of the outer wall of the base 1 through a third plate; a second bevel gear 15 and a third bevel gear 16 are respectively fixedly connected to the outer wall of the circular rod 14 at both ends, and the second bevel gear 15 is meshed with the first bevel gear 13; the first rotating rod 17 and the second rotating rod 18 are rotatably connected to the opposite sides of the outer wall of the base 1 through square plates;A fourth bevel gear 19 is fixedly connected to the outer wall of the first rotating rod 17, and the fourth bevel gear 19 is meshed with the third bevel gear 16; a fifth gear 20 is fixedly connected to the bottom ends of the outer walls of the first rotating rod 17 and the second rotating rod 18, and the pair of fifth gears 20 are meshed with each other; a pair of concave through grooves 21 are provided at the top of the outer wall of the base 1; an auxiliary rod 22 is fixedly connected to the top of the outer wall of the first rotating rod 17 and the second rotating rod 18, and the pair of auxiliary rods 22 are respectively located in the pair of concave through grooves 21, and the first bevel gear 13 is driven to rotate by the rotation of the rotating shaft 4, and the first bevel gear 13 is meshed with the second bevel gear 15, so that the rotation of the first bevel gear 13 is driven by the second bevel gear 15 The circular rod 14 and the third bevel gear 16 are rotated. Since the third bevel gear 16 and the fourth bevel gear 19 are meshed with each other, the rotation of the third bevel gear 16 drives the first rotating rod 17 to rotate. Since the outer wall bottom ends of the first rotating rod 17 and the second rotating rod 18 are fixedly connected with the fifth gear 20, and the pair of fifth gears 20 are meshed with each other, the rotation of the first rotating rod 17 drives the second rotating rod 18 to rotate, thereby driving the pair of auxiliary rods 22 to rotate. When the device needs to convey cylindrical materials such as aluminum alloy bars, the rotation of the pair of auxiliary rods 22 can make the conveying of the circular column aluminum alloy bars more stable, and the pair of auxiliary rods 22 can also play the role of positioning and limiting, so that the circular The cylindrical aluminum alloy bar is not easy to separate from between the pair of auxiliary rods 22 during the movement, and the cylindrical aluminum alloy bar can be continuously driven to move, so that the device has multiple conveying and loading functions, which can not only convey multiple raw materials to a suitable position, but also convey longer aluminum alloy bars to a suitable position for cutting and processing, etc., and the outer wall of the auxiliary rod 22 is provided with a cross groove 23; an adjusting block 24 is arranged in the cross groove 23; a group of auxiliary blocks 25 are fixedly connected to the outer wall of the adjusting block 24 through a group of springs; the outer walls of the group of auxiliary blocks 25 are in contact with the inner wall of the cross groove 23, and the cross groove 23 on the auxiliary rod 22 is provided with an adjusting block 24; the outer wall of the adjusting block 24 is fixed with a group of auxiliary blocks 25 through a group of springs; the outer walls of the group of auxiliary blocks 25 are in contact with the inner wall of the cross groove 23, and the cross groove 23 on the auxiliary rod 22 is provided with an adjusting block 24; the adjusting block 24 is fixed with a group of auxiliary blocks 25 through a group of springs; the outer walls of the group of auxiliary blocks 25 are in contact with the inner wall of the cross groove 23, and the adjusting block 24 is fixed with the inner wall of the cross groove 23. An adjusting block 24 is provided, and the adjusting block 24 is provided with a group of auxiliary blocks 25 through a group of springs, so that when the auxiliary rod 22 assists in conveying raw materials, the auxiliary block 25 can be extended and retracted through the spring, so that when the auxiliary rod 22 assists in conveying raw materials, raw materials of various widths can be conveyed. Through the self-extension adjustment of the auxiliary block 25, the conveying assistance range of the device is increased, making the device more practical, and the outer side wall of the adjusting block 24 is slidably connected to the inner side wall of the cross groove 23; the top end of the outer wall of the adjusting block 24 is rotatably connected with a threaded rod 26, and the top end of the outer wall of the threaded rod 26 passes through the auxiliary rod 22, and the threaded rod 26 is threadedly connected to the auxiliary rod 22;One end of the outer wall of the auxiliary block 25 is in an arc shape. By rotating the threaded rod 26, since the threaded rod 26 is threadedly connected to the auxiliary rod 22, the rotation of the threaded rod 26 will cause the threaded rod 26 to move up and down, so that the threaded rod 26 drives the adjustment block 24 to move up and down for adjustment. When the device does not need to use the auxiliary block 25 or the auxiliary block 25 affects other raw materials for conveying and feeding, the height of the adjustment block 24 can be adjusted by the threaded rod 26, so that the adjustment block 24 drives the auxiliary block 25 to move up, so that the adjustment block 24 is not easy to affect the conveying and feeding of other raw materials. When the sizes of the cylindrical aluminum alloy bars are different, by adjusting the position of the auxiliary block 25, the cylindrical aluminum alloy bars can achieve a better conveying effect. ;

[0024] Working principle: by placing the raw material in the raw material box 5, and then driving the rotating shaft 4 to rotate through the motor 3, the rotation of the rotating shaft 4 drives the transmission belt and the rotating roller 8 to rotate. At this time, the raw material in the raw material box 5 will fall through the raw material box 5 to the quantitative plate 12 at the discharge port 6. Through the rotation of the rotating shaft 4, since the rotating rod 7 and one end of the outer wall of the rotating shaft 4 are fixedly connected with the first sprocket 10, and a pair of first sprockets 10 are connected by the first chain 11, the rotation of the rotating shaft 4 drives the rotating rod 7 to rotate through the pair of first sprockets 10 and the first chain 11. Since a group of quantitative plates 12 are fixedly connected to the outer wall of the rotating rod 7, the rotation of the rotating rod 7 will drive the quantitative plates 12 to rotate, thereby achieving the effect of quantitative unloading, so that the raw materials will fall from the discharge port 6 to quantitatively. The raw materials are moved on the conveyor belt 9. When the raw materials move to the guide plate 27, they are scraped by the guide plate 27 and then move to the guide plate 27. From the guide plate 27, they fall into the aluminum alloy production equipment such as the melting furnace, so that the device does not need to be continuously fed manually. It only needs to pour the raw materials into the raw material box 5, thereby reducing the labor intensity of the staff and making it unnecessary for the staff to contact the high-performance aluminum alloy raw materials for a long time, thereby ensuring the health of the staff. The first bevel gear 13 is driven to rotate by the rotation of the rotating shaft 4. Since the first bevel gear 13 and the second bevel gear 15 are meshed with each other, the rotation of the first bevel gear 13 drives the circular rod 14 and the third bevel gear 16 to rotate through the second bevel gear 15. The wheel 16 is meshed with the fourth bevel gear 19, so that the rotation of the third bevel gear 16 drives the first rotating rod 17 to rotate through the fourth bevel gear 19. Because the outer wall bottom ends of the first rotating rod 17 and the second rotating rod 18 are fixedly connected with the fifth gear 20, and the pair of fifth gears 20 are meshed with each other, the rotation of the first rotating rod 17 drives the second rotating rod 18 to rotate through the pair of fifth gears 20, and the first rotating rod 17 and the second rotating rod 18 rotate in opposite directions, so that the pair of auxiliary rods 22 driven by the first rotating rod 17 and the second rotating rod 18 rotate in opposite directions, so that when the device needs to convey cylindrical materials such as aluminum alloy bars, the rotation of the pair of auxiliary rods 22 can make the conveying of the circular column aluminum alloy bars more stable, and the pair of auxiliary rods 22 can also play the role of positioning and limiting The function of positioning the cylindrical aluminum alloy bar makes it difficult for the cylindrical aluminum alloy bar to separate from between the pair of auxiliary rods 22 during the movement, and can achieve the effect of continuously driving the cylindrical aluminum alloy bar to move, so that the device has the function of conveying a variety of different types of materials or raw materials for loading, and can convey a variety of smaller raw materials to a suitable position, and can also convey longer and larger aluminum alloy bars to a suitable position for cutting and processing, etc., and an adjustment block 24 is provided in the cross groove 23 on the auxiliary rod 22, and the adjustment block 24 is provided with a group of auxiliary blocks 25 through a group of springs, so that when the auxiliary rod 22 assists in conveying the raw materials, the auxiliary block 25 can be retracted and retracted through the spring, so that when the auxiliary rod 22 assists in conveying the raw materials, raw materials of various widths can be conveyed.Through the self-retractable adjustment of the auxiliary block 25, the conveying assistance range of the device is increased, making the device more practical. By rotating the threaded rod 26, since the threaded rod 26 is threadedly connected to the auxiliary rod 22, the rotation of the threaded rod 26 will cause the threaded rod 26 to move up and down, so that the threaded rod 26 drives the adjustment block 24 to move up and down for adjustment, so that the device does not need to use the auxiliary block 25 or the auxiliary block 25 affects other raw materials for conveying and feeding. The height of the adjustment block 24 can be adjusted by the threaded rod 26, so that the adjustment block 24 drives the auxiliary block 25 to move up, so that the adjustment block 24 is not easy to affect the conveying and feeding of other raw materials. When the sizes of cylindrical aluminum alloy bars are different, by adjusting the position of the auxiliary block 25, the cylindrical aluminum alloy bars can achieve a better conveying effect.

[0025] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A feeding mechanism for high-performance aluminum alloy production, characterized in that: The invention comprises a base (1); the base (1) is in a U shape; a pair of columns (2) are fixedly connected to the bottom end of the outer wall of the base (1); a motor (3) is fixedly connected to one side of the outer wall of the base (1) via a first square plate; a rotating shaft (4) is provided at the output end of the motor (3), and one end of the outer wall of the rotating shaft (4) passes through the base (1); a raw material box (5) is fixedly connected to the top end of the outer wall of the base (1) via a pair of second square plates; the top end of the outer wall of the raw material box (5) is open, and the raw material box (5) 5) is fixedly connected to a feed opening (6) at the bottom end of the outer wall, and the feed opening (6) is communicated with the raw material box (5); the inner wall of the feed opening (6) is provided with a feed opening member; the feed opening member comprises a rotating rod (7); the inner wall of the base (1) is rotatably connected to a rotating roller (8); the rotating roller (8) and the rotating shaft (4) are driven by a conveyor belt (9); the inner wall of the base (1) is fixedly connected to a guide plate (27), and one end of the outer wall of the guide plate (27) is in contact with the conveyor belt (9).

2. A feeding mechanism for high performance aluminum alloy production according to claim 1, characterized in that: One end of the outer wall of the rotating rod (7) is rotatably connected to one side of the inner wall of the discharge port (6), and the other end of the outer wall of the rotating rod (7) passes through the discharge port (6) and the second square plate; one end of the outer wall of the rotating rod (7) and the rotating shaft (4) are both fixedly connected to a first sprocket (10), and a pair of first sprockets (10) are connected by a first chain (11); a group of quantitative plates (12) are fixedly connected to the outer wall of one end of the rotating rod (7) located in the discharge port (6), and the quantitative plates (12) match the discharge port (6).

3. A feeding mechanism for high-performance aluminum alloy production according to claim 2, characterized in that: The first bevel gear (13) is fixedly connected to the outer wall of one end of the rotating shaft (4) that does not pass through the base (1); a circular rod (14) is rotatably connected to one side of the outer wall of the base (1) through a third plate; a second bevel gear (15) and a third bevel gear (16) are respectively fixedly connected to the two ends of the outer wall of the circular rod (14), and the second bevel gear (15) and the first bevel gear (13) are meshed with each other; a first rotating rod (17) and a second rotating rod (18) are respectively rotatably connected to the opposite sides of the outer wall of the base (1) through a square plate; the first rotating rod (17) ) is fixedly connected to the outer wall of the first rotating rod (17) and the fourth rotating rod (19) is meshed with the third rotating rod (16); the bottom ends of the outer walls of the first rotating rod (17) and the second rotating rod (18) are fixedly connected to the fifth gear (20), and the pair of fifth gears (20) are meshed with each other; the top end of the outer wall of the base (1) is provided with a pair of concave through grooves (21); the top ends of the outer walls of the first rotating rod (17) and the second rotating rod (18) are fixedly connected to auxiliary rods (22), and the pair of auxiliary rods (22) are respectively located in the pair of concave through grooves (21).

4. A feeding mechanism for high-performance aluminum alloy production according to claim 3, characterized in that: The outer side wall of the auxiliary rod (22) is provided with a cross groove (23); an adjusting block (24) is arranged in the cross groove (23); a group of auxiliary blocks (25) are fixedly connected to the outer side wall of the adjusting block (24) via a group of springs; the outer side walls of the group of auxiliary blocks (25) are in contact with the inner side wall of the cross groove (23).

5. A feeding mechanism for high performance aluminum alloy production according to claim 4, characterized in that: The outer wall of the adjusting block (24) is slidably connected to the inner wall of the cross groove (23); the top end of the outer wall of the adjusting block (24) is rotatably connected to a threaded rod (26), and the top end of the outer wall of the threaded rod (26) penetrates the auxiliary rod (22), and the threaded rod (26) is threadedly connected to the auxiliary rod (22); one end of the outer wall of the auxiliary block (25) is in an arc shape.

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