A strand positioning device and a positioning method

Abstract

The application relates to the casting billet technical field and discloses a casting billet limiting device, which comprises a roller conveyor for conveying a round billet and a travel switch located on the roller conveyor, and the end of the roller conveyor is rotationally connected with a conveying mechanism. The steel wire rope is wound on the winding roller, the lower end of the steel wire rope is fixedly connected with a weight through a fixed column, the roller conveyor can be closed in time, the round billet end is prevented from being suspended and bent to cause the casting billet to be scrapped, and the like. The small semicircular groove and the large semicircular groove are arranged at the middle position of the conveying roller, the pull rope is wound in the small semicircular groove and the large semicircular groove, the baffle corresponding to the large semicircular groove is fixedly connected to the outer end of the pull rope, and the inserting plate corresponding to the inner wall of the round billet is fixedly connected to one side of the baffle, so that the slippage between the conveying roller and the round billet can be avoided, and the conveying roller is prevented from not rotating.

Description

Technical Field

[0001] This invention relates to the field of billet technology, specifically to a billet limiting device and limiting method. Background Technology

[0002] Continuously cast billets are products obtained by casting molten steel from a steelmaking furnace through a continuous casting machine. Continuously cast billets with a circular cross-section are called round billets. Their main uses are categorized into tube billets and forging billets based on diameter. Billets smaller than 300mm are mainly tube billets, generally used as raw materials for seamless steel pipes; billets larger than 300mm are mostly forging billets, generally used as raw materials for various forgings.

[0003] When casting billets are transferred across roller conveyors, there are often situations where the ends of the billets are suspended in the air and bent due to the operator's failure to stop in time, resulting in scrapping. This poses a significant safety hazard. The length of the roller conveyor is limited, and a 21-meter casting billet requires a 1.5-meter suspended hoist for balanced lifting. Lengthening the roller conveyor would be detrimental to the transfer and hoisting of the casting billets. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a billet limiting device and limiting method, thereby solving the problems raised in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a billet limiting device, comprising a roller conveyor for conveying round billets and a limit switch located on the roller conveyor, a conveying mechanism rotatably connected to the end of the roller conveyor, the conveying mechanism being slidably connected to the round billet, a limiting mechanism rotatably connected to one side of the end of the roller conveyor, the limiting mechanism being fixedly connected to the conveying mechanism, a fixing mechanism being fixedly connected to one side of the conveying mechanism, a limiting plate corresponding to the limiting mechanism being fixedly connected to the roller conveyor, and an electric push rod corresponding to the limit switch embedded in the roller conveyor, one end of the electric push rod being fixedly connected to a stop block corresponding to the limiting mechanism;

[0008] The limiting mechanism includes a take-up roller that is rotatably connected to the roller conveyor and a fixed column that is fixedly connected to the roller conveyor. A steel wire rope is wound on the take-up roller, and a counterweight is fixedly connected to the lower end of the steel wire rope after passing around the fixed column. The counterweight is located above the limiting plate. A limiting ring is fitted on the take-up roller, and the limiting ring is slidably connected to the steel wire rope and fixedly connected to the roller conveyor.

[0009] Preferably, the conveying mechanism includes a conveying roller rotatably connected to the roller conveyor, the conveying roller being fixedly connected to the winding roller, the conveying roller being slidably connected to the round blank, a small semi-circular groove being provided in the middle of the conveying roller, and a large semi-circular groove communicating with the small semi-circular groove being provided in the middle of the conveying roller, a pull rope being wound in the small semi-circular groove and the large semi-circular groove, a baffle corresponding to the large semi-circular groove being fixedly connected to the outer end of the pull rope, an insert plate corresponding to the inner wall of the round blank being fixedly connected to one side of the baffle, and a limiting block corresponding to the pull rope being fixedly connected to one side of the small semi-circular groove on the baffle.

[0010] Preferably, the pull rope consists of two non-elastic connecting ropes, one of which is rotatably connected to a threaded post at one end, and the other connecting rope is fixedly connected to a threaded ring that matches the threaded post at one end.

[0011] Preferably, the fixing mechanism includes a connecting plate fixedly connected to the roller conveyor. A sliding cavity is opened in the connecting plate, and a sliding opening communicating with the sliding cavity is opened at the upper end of the connecting plate. A threaded rod is rotatably connected in the sliding cavity. Two connecting blocks are threadedly connected to the threaded rod. A limit rod is fixedly connected to the upper end of the connecting blocks. An arc-shaped clamp is fixedly connected to the upper end of the limit rod. One end of the threaded rod passes through the roller conveyor and is fixedly connected to a first gear. A second gear is meshed with one side of the first gear and is fixedly connected to the conveyor roller.

[0012] Preferably, the threaded rod consists of two connecting rods with opposite thread directions.

[0013] Preferably, the diameter of the first gear is larger than the diameter of the second gear.

[0014] Preferably, a rubber layer is provided on both the outer side of the conveyor roller and the inner side of the arc-shaped clamp.

[0015] A billet limiting device and limiting method include the following steps:

[0016] a. The counterweight is located on the limit plate, the stop block is located inside the roller conveyor, the wire rope is in a straight state, one end of the round billet is conveyed to one side of the conveyor roller by the roller conveyor, the insert plate slides into the round billet, the length of the insert plate is greater than the inner diameter of the round billet, to prevent the insert plate from sliding out of the round billet.

[0017] b. The movement of the billet drives the conveyor roller to rotate, which in turn drives the take-up roller to rotate. The take-up roller winds the wire rope, which in turn drives the counterweight to move upward until one end of the billet is 1.5 meters away from the roller conveyor. At this point, the counterweight hits the limit switch, which shuts down the roller conveyor. This prevents the billet from being scrapped due to the operator not stopping in time, causing the end of the billet to be suspended and bent. At the same time, the limit switch can activate the electric push rod to push out the stop block and support the counterweight.

[0018] c. While the conveyor roller rotates, it drives the second gear to rotate. The second gear drives the first gear to rotate. The first gear drives the threaded rod to rotate. The threaded rod drives the two connecting blocks to move towards each other in the sliding cavity. The connecting blocks drive the two limiting rods to move towards each other in the sliding opening, so that the two arc-shaped clamping plates move towards each other to clamp the round blank and prevent the round blank from continuing to move forward due to inertia.

[0019] d. While the billet moves, the insert plate can also move. The insert plate pulls the pull rope through the baffle, and the pull rope can also drive the conveyor roller to rotate. This can prevent slippage between the conveyor roller and the billet, which would cause the conveyor roller to stop rotating.

[0020] e. By rotating the threaded ring, the threaded ring is separated from the threaded post, the insert plate is removed from the round blank, the round blank is fixed by an external lifting tool, and then the threaded ring is connected to the threaded post.

[0021] f. By controlling the limit switch, the roller conveyor is started and continues to convey the round billet behind. At the same time, the electric push rod is activated to retract, so that the stop block retracts into the roller conveyor. The counterweight moves down to the limit plate, so that the conveyor roller rotates to wind up the pull rope and reset the stop plate and the insert plate. The rotation of the conveyor roller can also reset the two arc-shaped clamps through the second gear. Then the lifting device can lift the round billet.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention, by winding a steel wire rope on the take-up roller, with the lower end of the steel wire rope passing over a fixed column and fixedly connected to a counterweight, can shut down the roller conveyor in time, avoiding the phenomenon of the billet end being suspended and bent due to the operator not stopping in time, resulting in scrap.

[0025] 2. In this invention, a small semi-circular groove and a large semi-circular groove are opened in the middle position of the conveyor roller, and a pull rope is wound in the small semi-circular groove and the large semi-circular groove. A baffle corresponding to the large semi-circular groove is fixedly connected to the outer end of the pull rope, and an insert plate corresponding to the inner wall of the round blank is fixedly connected to one side of the baffle. This can prevent slippage between the conveyor roller and the round blank, which would cause the conveyor roller to stop rotating.

[0026] 3. In this invention, by rotating a threaded rod within the sliding cavity of a connecting plate, two connecting blocks are threaded onto the threaded rod, and two arc-shaped clamping plates are fixedly connected to the upper end of a limiting rod at the upper end of the connecting blocks. A second gear, which is fixedly connected to a conveying roller, meshes with the first gear on the threaded rod. This allows the two arc-shaped clamping plates to move towards each other to clamp the round blank, preventing the round blank from continuing to move forward due to inertia. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall front view of the present invention;

[0028] Figure 2 This is a schematic diagram of the overall front cross-sectional structure of the present invention;

[0029] Figure 3 This is a top view of the overall structure of the present invention;

[0030] Figure 4 for Figure 3 A magnified structural diagram of A in the middle;

[0031] Figure 5 This is a top view of the fixing mechanism of the present invention;

[0032] Figure 6 This is a side cross-sectional view of the fixing mechanism of the present invention;

[0033] Figure 7 This is a three-dimensional structural diagram of the conveying mechanism of the present invention;

[0034] Figure 8 for Figure 7 A magnified structural diagram of B in the diagram;

[0035] Figure 9 This is a three-dimensional structural diagram of another state of the conveying mechanism of the present invention;

[0036] Figure 10 This is a front view schematic diagram of the limiting mechanism of the present invention.

[0037] In the diagram: 1. Roller conveyor; 2. Round billet; 3. Conveying mechanism; 4. Fixing mechanism; 5. Limiting mechanism; 6. Limit switch; 7. Limiting plate; 8. Stop block; 9. Electric push rod; 301. Conveying roller; 302. Large semi-circular groove; 303. Baffle; 304. Small semi-circular groove; 305. Insert plate; 306. Pull rope; 307. Threaded ring; 308. Threaded column; 309. Limiting block; 401. Connecting plate; 402. Sliding mouth; 403. Threaded rod; 404. Arc-shaped clamp; 405. Second gear; 406. First gear; 407. Limiting rod; 408. Connecting block; 409. Sliding cavity; 501. Counterweight; 502. Steel wire rope; 503. Rewinding roller; 504. Limiting ring; 505. Fixing column.

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0039] Please see Figure 1-10A billet limiting device includes a roller conveyor 1 for conveying a round billet 2 and a limit switch 6 located on the roller conveyor 1. A conveying mechanism 3 is rotatably connected to the end of the roller conveyor 1 and is slidably connected to the round billet 2. A limiting mechanism 5 is rotatably connected to one side of the end of the roller conveyor 1 and is fixedly connected to the conveying mechanism 3. A fixing mechanism 4 is fixedly connected to one side of the conveying mechanism 3. A limiting plate 7 corresponding to the limiting mechanism 5 is fixedly connected to the roller conveyor 1. An electric push rod 9 corresponding to the limit switch 6 is embedded in the roller conveyor 1. A stop block 8 corresponding to the limiting mechanism 5 is fixedly connected to one end of the electric push rod 9.

[0040] The limiting mechanism 5 includes a take-up roller 503 rotatably connected to the roller conveyor 1 and a fixed column 505 fixedly connected to the roller conveyor 1. A steel wire rope 502 is wound on the take-up roller 503. The lower end of the steel wire rope 502 passes over the fixed column 505 and is fixedly connected to a counterweight 501. The counterweight 501 is located above the limiting plate 7. A limiting ring 504 is sleeved on the take-up roller 503. The limiting ring 504 is slidably connected to the steel wire rope 502 and is fixedly connected to the roller conveyor 1. The limiting ring 504 can close the roller conveyor 1 in time to avoid the phenomenon of the billet 2 being suspended and bent due to the operator's failure to stop in time, resulting in scrap. The conveying mechanism 3 includes a conveying roller 301 rotatably connected to the roller conveyor 1. The conveying roller 301 is fixedly connected to the take-up roller 503. The conveyor roller 301 is slidably connected to the blank 2. A small semi-circular groove 304 is formed in the middle of the conveyor roller 301, and a large semi-circular groove 302 communicating with the small semi-circular groove 304 is also formed in the middle of the conveyor roller 301. A pull rope 306 is wound inside the small semi-circular groove 304 and the large semi-circular groove 302. A baffle 303 corresponding to the large semi-circular groove 302 is fixedly connected to the outer end of the pull rope 306. An insert plate 305 corresponding to the inner wall of the blank 2 is fixedly connected to one side of the baffle 303. The pull rope 306 consists of two non-elastic connecting ropes. One end of one connecting rope is rotatably connected to a threaded post 308, and the other end of the connecting rope is fixedly connected to a threaded ring 307 that matches the threaded post 308, so that the pull rope 306 can be detached for easy handling. The insert plate 305 is removed from the blank 2. The small semi-circular groove 304 is located on one side of the baffle 303 and is fixedly connected to a limiting block 309 corresponding to the pull rope 306. This can prevent slippage between the conveyor roller 301 and the blank 2, which would cause the conveyor roller 301 to stop rotating. The fixing mechanism 4 includes a connecting plate 401 fixedly connected to the roller conveyor 1. A sliding cavity 409 is opened in the connecting plate 401. A sliding opening 402 communicating with the sliding cavity 409 is opened at the upper end of the connecting plate 401. A threaded rod 403 is rotatably connected in the sliding cavity 409. Two connecting blocks 408 are threadedly connected to the threaded rod 403. A limiting rod 407 is fixedly connected to the upper end of the connecting block 408. An arc-shaped clamping plate 404 is fixedly connected to the upper end of the limiting rod 407. The outer side of the conveyor roller 301 is connected to the arc-shaped clamping plate 404. The inner side of 4 is provided with a rubber layer to increase friction. The threaded rod 403 is composed of two connecting rods with opposite thread directions, which can drive the two connecting blocks 408 to move towards each other in the sliding cavity 409. The connecting blocks 408 drive the two limiting rods 407 to move towards each other in the sliding opening 402, so that the two arc-shaped clamping plates 404 move towards each other to clamp the round blank 2 and prevent the round blank 2 from continuing to move forward due to inertia. One end of the threaded rod 403 passes through the roller conveyor 1 and is fixedly connected to the first gear 406. The first gear 406 is meshed with the second gear 405 on one side. The second gear 405 is fixedly connected to the conveyor roller 301, so that the two arc-shaped clamping plates 404 move towards each other to clamp the round blank 2 and prevent the round blank 2 from continuing to move forward due to inertia.The diameter of the first gear 406 is larger than the diameter of the second gear 405. By reducing speed, when one end of the round blank 2 is 1.5 meters away from the roller conveyor 1, the arc-shaped clamping plate 404 precisely clamps the round blank 2.

[0041] A billet limiting device and limiting method include the following steps:

[0042] a. The counterweight 501 is located on the limiting plate 7, the stop block 8 is located inside the roller conveyor 1, the wire rope 502 is in a straight state, one end of the round billet 2 is conveyed by the roller conveyor 1 to the side of the conveyor roller 301, the insert plate 305 slides into the round billet 2, the length of the insert plate 305 is greater than the inner diameter of the round billet 2 to prevent the insert plate 305 from sliding out of the round billet 2.

[0043] b. The movement of the billet 2 drives the conveyor roller 301 to rotate, which in turn drives the take-up roller 503 to rotate. The take-up roller 503 winds the wire rope 502, which in turn drives the counterweight 501 to move upward until one end of the billet 2 is 1.5 meters away from the roller conveyor 1. At this point, the counterweight 501 knocks down the limit switch 6, which shuts down the roller conveyor 1. This prevents the billet 2 from being suspended and bent due to the operator's failure to stop in time, thus avoiding scrapping the billet. At the same time, the limit switch 6 can activate the electric push rod 9 to push out the stop block 8 to support the counterweight 501.

[0044] c. While the conveyor roller 301 rotates, it drives the second gear 405 to rotate. The second gear 405 drives the first gear 406 to rotate. The first gear 406 drives the threaded rod 403 to rotate. The threaded rod 403 drives the two connecting blocks 408 to move towards each other in the sliding cavity 409. The connecting blocks 408 drive the two limiting rods 407 to move towards each other in the sliding opening 402, so that the two arc-shaped clamping plates 404 move towards each other to clamp the round blank 2 and prevent the round blank 2 from continuing to move forward due to inertia.

[0045] d. While the round blank 2 moves, it can also drive the insert plate 305 to move. The insert plate 305 pulls the pull rope 306 through the baffle 303. The pull rope 306 can also drive the conveyor roller 301 to rotate, which can prevent slippage between the conveyor roller 301 and the round blank 2, which would cause the conveyor roller 301 to stop rotating.

[0046] e. By rotating the threaded ring 307, the threaded ring 307 is separated from the threaded post 308, the insert plate 305 is removed from the round blank 2, the round blank 2 is fixed by an external lifting tool, and then the threaded ring 307 is connected to the threaded post 308.

[0047] f. By controlling the limit switch 6, the roller conveyor 1 is started and continues to convey the round billet 2. At the same time, the electric push rod 9 is activated to retract, so that the stop block 8 retracts into the roller conveyor 1. The counterweight 501 moves down to the limit plate 7, so that the conveyor roller 301 rotates to wind up the pull rope 306 and reset the baffle 303 and the insert plate 305. The rotation of the conveyor roller 301 can also reset the two arc-shaped clamps 404 through the second gear 405. Then the lifting device can lift the round billet 2.

[0048] Working principle: First, the counterweight 501 is positioned on the limiting plate 7, the stop block 8 is located inside the roller conveyor 1, and the wire rope 502 is taut. One end of the round billet 2 is conveyed by the roller conveyor 1 to one side of the conveyor roller 301. The insert plate 305 slides into the round billet 2. The length of the insert plate 305 is greater than the inner diameter of the round billet 2 to prevent the insert plate 305 from sliding out of the round billet 2. The movement of the round billet 2 drives the conveyor roller 301 to rotate, which in turn drives the winding roller 503 to rotate. The winding roller 503 winds the wire rope 502, which in turn drives the counterweight 501 to move upward until one end of the round billet 2 is away from the roller conveyor 1. At 1.5 meters, the weight 501 knocks over the limit switch 6, shutting down the roller conveyor 1. This prevents the billet 2 from being suspended and bent due to operator delays, thus avoiding scrapping. Simultaneously, the limit switch 6 activates the electric actuator 9 to push out the stop block 8, supporting the weight 501. As the conveyor roller 301 rotates, it drives the second gear 405, which in turn drives the first gear 406. The first gear 406 then drives the threaded rod 403, which in turn drives two connecting blocks 408 to move towards each other within the sliding cavity 409. The two limiting rods 407 move towards each other within the sliding opening 402, causing the two arc-shaped clamping plates 404 to move towards each other to clamp the round blank 2, preventing the round blank 2 from continuing to move forward due to inertia. Simultaneously, the movement of the round blank 2 also moves the insert plate 305. The insert plate 305 pulls the pull rope 306 through the baffle 303, and the pull rope 306 also drives the conveyor roller 301 to rotate, preventing slippage between the conveyor roller 301 and the round blank 2, which would cause the conveyor roller 301 to stop rotating. Then, the operator rotates the threaded ring 307 to separate it from the threaded post 308, removing the insert plate 305 from the round blank 2. The blank 2 is then fixed using an external lifting device, and the threaded ring 307 is connected to the threaded post 308. Then, the operator starts the roller conveyor 1 by controlling the limit switch 6 to continue conveying the blank 2. At the same time, the electric push rod 9 is activated to retract, causing the stop block 8 to retract into the roller conveyor 1. The counterweight 501 moves down to the limit plate 7, causing the conveyor roller 301 to rotate and wind up the pull rope 306, resetting the baffle 303 and the insert plate 305. The rotation of the conveyor roller 301 can also reset the two arc-shaped clamps 404 through the second gear 405. Then, the lifting device can lift the blank 2.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A billet limiting device, comprising a roller conveyor (1) for conveying a round billet (2) and a limit switch (6) located on the roller conveyor (1), characterized in that, A conveying mechanism (3) is rotatably connected to the end of the roller conveyor (1). The conveying mechanism (3) is slidably connected to the round billet (2). A limiting mechanism (5) is rotatably connected to one side of the end of the roller conveyor (1). The limiting mechanism (5) is fixedly connected to the conveying mechanism (3). A fixing mechanism (4) is fixedly connected to one side of the conveying mechanism (3). A limiting plate (7) corresponding to the limiting mechanism (5) is fixedly connected to the roller conveyor (1). An electric push rod (9) corresponding to the limit switch (6) is embedded in the roller conveyor (1). A stop block (8) corresponding to the limiting mechanism (5) is fixedly connected to one end of the electric push rod (9). The limiting mechanism (5) includes a take-up roller (503) rotatably connected to the roller conveyor (1) and a fixed column (505) fixedly connected to the roller conveyor (1). A steel wire rope (502) is wound on the take-up roller (503). A counterweight (501) is fixedly connected to the lower end of the steel wire rope (502) around the fixed column (505). The counterweight (501) is located above the limiting plate (7). A limiting ring (504) is sleeved on the take-up roller (503). The limiting ring (504) is slidably connected to the steel wire rope (502). The limiting ring (504) is fixedly connected to the roller conveyor (1). The conveying mechanism (3) includes a conveying roller (301) rotatably connected to the roller conveyor (1). The conveying roller (301) is fixedly connected to the winding roller (503). The conveying roller (301) is slidably connected to the round blank (2). A small semi-circular groove (304) is opened in the middle position of the conveying roller (301). A large semi-circular groove (302) communicating with the small semi-circular groove (304) is also opened in the middle position of the conveying roller (301). A pull rope (306) is wound in the small semi-circular groove (304) and the large semi-circular groove (302). A baffle (303) corresponding to the large semi-circular groove (302) is fixedly connected to the outer end of the pull rope (306). An insert plate (305) corresponding to the inner wall of the round blank (2) is fixedly connected to one side of the baffle (303). A limiting block (309) corresponding to the pull rope (306) is fixedly connected to the small semi-circular groove (304) on one side of the baffle (303).

2. The billet limiting device according to claim 1, characterized in that, The pull rope (306) consists of two non-elastic connecting ropes, one of which is rotatably connected to a threaded post (308) at one end, and the other connecting rope is fixedly connected to a threaded ring (307) that matches the threaded post (308) at one end.

3. A billet limiting device according to claim 1 or 2, characterized in that, The fixing mechanism (4) includes a connecting plate (401) fixedly connected to the roller conveyor (1). A sliding cavity (409) is provided in the connecting plate (401). A sliding opening (402) communicating with the sliding cavity (409) is provided at the upper end of the connecting plate (401). A threaded rod (403) is rotatably connected in the sliding cavity (409). Two connecting blocks (408) are threadedly connected to the threaded rod (403). A limit rod (407) is fixedly connected to the upper end of the connecting block (408). An arc-shaped clamp (404) is fixedly connected to the upper end of the limit rod (407). One end of the threaded rod (403) passes through the roller conveyor (1) and is fixedly connected to a first gear (406). A second gear (405) is meshed on one side of the first gear (406). The second gear (405) is fixedly connected to the conveyor roller (301).

4. A billet limiting device according to claim 3, characterized in that, The threaded rod (403) consists of two connecting rods with opposite thread directions.

5. A billet limiting device according to claim 3, characterized in that, The diameter of the first gear (406) is larger than the diameter of the second gear (405).

6. A billet limiting device according to claim 4, characterized in that, The diameter of the first gear (406) is larger than the diameter of the second gear (405).

7. A billet limiting device according to claim 3, characterized in that, A rubber layer is provided on the outer side of the conveyor roller (301) and the inner side of the arc-shaped clamp (404).

8. A billet limiting device according to claim 4, 5 or 6, characterized in that, Both the outer side of the conveyor roller (301) and the inner side of the arc-shaped clamp (404) are provided with rubber layers.

9. A method for limiting the position of a cast billet, characterized in that, The following usage steps are included: a. First, the counterweight (501) is located on the limiting plate (7), the stop block (8) is located inside the roller conveyor (1), the wire rope (502) is in a straight state, one end of the round billet (2) is conveyed by the roller conveyor (1) to the side of the conveyor roller (301), the insert plate (305) slides into the round billet (2), the length of the insert plate (305) is greater than the inner diameter of the round billet (2) to prevent the insert plate (305) from sliding out of the round billet (2); b. The movement of the round billet (2) drives the conveyor roller (301) to rotate. The conveyor roller (301) drives the take-up roller (503) to rotate. The take-up roller (503) winds the wire rope (502). The wire rope (502) drives the weight (501) to move upward until one end of the round billet (2) is 1.5 meters away from the roller conveyor (1). At this time, the weight (501) knocks down the limit switch (6), which shuts down the roller conveyor (1). This can prevent the phenomenon of the round billet (2) being suspended and bent due to the operator not stopping in time, resulting in scrap. At the same time, the limit switch (6) can activate the electric push rod (9) to push out the stop block (8) to support the weight (501). c. While the conveyor roller (301) rotates, it drives the second gear (405) to rotate. The second gear (405) drives the first gear (406) to rotate. The first gear (406) drives the threaded rod (403) to rotate. The threaded rod (403) drives the two connecting blocks (408) to move towards each other in the sliding cavity (409). The connecting blocks (408) drive the two limiting rods (407) to move towards each other in the sliding opening (402), so that the two arc-shaped clamping plates (404) move towards each other to clamp the round blank (2) and prevent the round blank (2) from continuing to move forward due to inertia. d. While the round blank (2) moves, it can also drive the insert plate (305) to move. The insert plate (305) pulls the pull rope (306) through the baffle (303). The pull rope (306) can also drive the conveyor roller (301) to rotate, which can prevent slippage between the conveyor roller (301) and the round blank (2), which would cause the conveyor roller (301) to stop rotating. e. Then, the workers rotate the threaded ring (307) to separate the threaded ring (307) from the threaded post (308), remove the insert plate (305) from the round blank (2), fix the round blank (2) with an external lifting tool, and then connect the threaded ring (307) to the threaded post (308). f. Then, the staff controls the limit switch (6) to start the roller conveyor (1) and continue to convey the round billet (2) behind. At the same time, the electric push rod (9) is activated to retract, so that the stop block (8) retracts into the roller conveyor (1). The weight (501) moves down to the limit plate (7), so that the conveyor roller (301) rotates to wind up the pull rope (306) and reset the baffle (303) and the insert plate (305). The rotation of the conveyor roller (301) can also reset the two arc-shaped clamps (404) through the second gear (405). Then the lifting device can lift the round billet (2).

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