A casting rod lifting device and a lifting method

Abstract

The present application relates to the technical fields of metal casting, and discloses a kind of casting bar hoisting device and hoisting method, including the track being arranged between conveying roller way and casting pit, the track car is slidably installed on the track, the track car is rotatably provided with mounting bracket at one end away from conveying roller way, the mounting bracket is equipped with several groups of slide rods corresponding to the casting mouth of casting pit, the side upper end of slide rod is equipped with fixed roller group, and the side lower end of slide rod is slidably equipped with movable roller group.The present application utilizes fixed roller group and movable roller group on slide rod to clamp and pull round bar ingot, completely replaces traditional overhead crane hoisting mode, does not need the height space occupied by lifting appliance and overhead crane hook head, significantly reduces the height requirement of workshop, especially suitable for old workshop modification scene, can greatly reduce modification cost, and also does not need manual ring or steel wire rope unloading, can improve pulling efficiency, and operation safety is high.

Description

Technical Field

[0001] This invention relates to the field of metal casting technology, specifically to a casting rod lifting device and lifting method. Background Technology

[0002] Deep well casting involves cooling the ingots in a crystallizer and using cooling water to gradually solidify them by pulling the ingot head down into the well, producing multiple ingots with identical cross-sections (including large flat ingots, round bars, square bars, etc.). After casting, these ingots are generally arranged in at least one row, and often in multiple rows or multiple pieces, standing vertically in the casting well. In order to proceed with the next stage of production, they need to be pulled out of the casting well and laid flat using certain methods.

[0003] Currently, overhead cranes are typically used to lift ingots out of the casting well opening using clamps and then lay them flat. For example, patent number CN103863937A discloses a lifting device for large aluminum alloy round bars, which includes a crossbeam, multiple circular lifting rings, and auxiliary devices. The round bars are lifted by fitting the circular lifting rings onto them. Patent number CN118619067A discloses a lifting method specifically for producing flat ingots in deep-well vertical casting in a melting and casting workshop. This method involves adding an auxiliary pit next to the deep well of the casting machine, using an overhead crane to lift the flat ingots in place from the bottom of the auxiliary pit, and then using the overhead crane to move the flat ingots horizontally from the side of the deep well and lift them vertically into the auxiliary pit.

[0004] However, the above-mentioned method of using overhead cranes for lifting still has the following shortcomings: 1. When using overhead cranes to lift ingots, a lifting device is required. The lifting device has a certain height (generally ranging from 1 to 4 meters), and the distance between the overhead crane hook and the top of the overhead crane rail is also a certain height (generally about 1 to 1.5 meters). The distance between the ingot and the ground level also needs to be considered at about 0.5 meters, which requires a total of about 2.5 to 6 meters of height space, resulting in high factory construction costs. Moreover, if the height of the rail top is insufficient when renovating an old factory, the renovation cost will increase significantly; 2. When using overhead cranes to lift small-sized ingots, it is generally necessary to manually hang the ring or use a wire rope to hang the ingot head. After lifting, when placing it in the storage area, it is necessary to manually unload the ring or wire rope, which is inefficient and dangerous. Summary of the Invention

[0005] The technical problem this invention aims to solve is to overcome existing defects and provide a casting ingot lifting device and method. This method involves setting a track between the conveyor roller conveyor and the casting well, sliding a railcar on the track, and rotating an installation frame on the railcar. The device utilizes a fixed roller assembly and a moving roller assembly on a sliding rod to clamp and extract the round casting ingot. This completely replaces the traditional overhead crane lifting method, eliminating the need for lifting tools and overhead crane hooks, significantly reducing factory height requirements. It is particularly suitable for renovating old factories, greatly reducing renovation costs. Furthermore, it eliminates the need for manual unloading of rings or wire ropes, improving extraction efficiency and ensuring high operational safety. This effectively solves the problems in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a casting rod lifting device, comprising a track arranged between a conveyor roller conveyor and a casting well, a railcar slidably mounted on the track, a mounting frame rotatably mounted at the end of the railcar away from the conveyor roller conveyor, a plurality of sliding rods corresponding to the casting openings of the casting well being mounted on the mounting frame, a fixed roller assembly mounted on the upper side of the sliding rod, and a movable roller assembly slidably mounted on the lower side of the sliding rod, both the fixed roller assembly and the movable roller assembly including a fixed frame, two rollers rotatably mounted on the fixed frame, the fixed frame of the fixed roller assembly being fixedly connected to the sliding rod, the fixed frame of the movable roller assembly being slidably connected to the sliding rod, and a reduction motor connected to one of the rollers being mounted on the fixed frame of the movable roller assembly, the reduction motor driving the roller closer to the conveyor roller conveyor to rotate, and a slide rail corresponding to the movable roller assembly being mounted on the railcar.

[0007] As a preferred embodiment of the present invention, an electro-hydraulic actuator is rotatably mounted on the railcar, and the telescopic end of the electro-hydraulic actuator is rotatably connected to the middle part of the mounting frame.

[0008] As a preferred embodiment of the present invention, the distance between the two rollers on the fixed roller group is greater than the diameter of the round bar ingot.

[0009] As a preferred embodiment of the present invention, a locking motor is provided on the side of the mounting frame, and an eccentric rod is provided on the output shaft of the locking motor to limit the fixed frame of the moving roller assembly.

[0010] As a preferred embodiment of the present invention, the lower side of the slide bar is provided with a positioning plate that supports the fixing frame of the moving roller assembly, and a pressure sensor is provided on the upper surface of the positioning plate.

[0011] A lifting method for a casting rod lifting device includes the following steps: S1. Drive the track car to move along the track to the set position of the casting well, so that the fixed roller group and the moving roller group are aligned with the round bar ingot in the casting well. At this time, the locking motor drives the eccentric rod to be in the limit state, blocking and limiting the fixed frame of the moving roller group, so that the moving roller group and the top of the round bar ingot maintain a preset distance. S2. Start the locking motor to drive the eccentric rod to rotate and release the limit on the fixed frame. The fixed frame of the moving roller group slides down along the slide bar under the action of gravity. At the same time, the eccentric rod presses down against the upper surface of the fixed frame during the rotation process, and the auxiliary moving roller group is locked onto the round bar ingot. Then the locking motor is reset. S3. Start the geared motor to drive the rollers in the moving roller group to rotate. The friction between the rollers and the round bar ingot will drive the round bar ingot to move upward until the round bar ingot is completely pulled out of the casting well. During the upward movement of the round bar ingot, the rollers of the fixed roller group will guide the round bar ingot. S4. During the pulling process, the pressure sensor on the positioning plate detects the pressure signal of the moving roller group. If the pressure signal remains unchanged, it is determined that the round bar ingot has not been pulled out or the moving roller group has not been effectively engaged with the round bar ingot, and an alarm signal is triggered. S5. After the round bar ingot is completely pulled out, start the electro-hydraulic actuator to drive the mounting frame to rotate relative to the railcar, so that the mounting frame flips from the vertical state to the horizontal state. S6. After the mounting frame is flipped to a horizontal position, the geared motor is started again to drive the rollers of the moving roller group. During the rotation of the rollers, they move along the slide bar, while the railcar moves along the track towards the conveyor roller table. The moving roller group pushes the horizontal round bar ingot onto the conveyor roller table.

[0012] As a preferred embodiment of the present invention, in S3, the two rollers of the fixed roller group only roll in contact with the side wall of the round bar ingot and play a guiding role, without providing clamping driving force, and the distance between the two rollers of the fixed roller group is greater than the diameter of the round bar ingot.

[0013] As a preferred technical solution of the present invention, in S2, the eccentric rod changes its contact position with the fixed frame by rotating. When the distal end of the eccentric rod rotates to the lower position, it presses down against the upper surface of the fixed frame, applying a downward auxiliary thrust to the moving roller assembly, so that the moving roller assembly overcomes the jamming and presses the round bar ingot.

[0014] As a preferred embodiment of the present invention, in S4, when the pressure signal collected by the pressure sensor remains unchanged, the locking motor of the corresponding group drives the eccentric rod to perform a secondary automatic clamping cycle, specifically as follows: First, control the locking motor to rotate in the opposite direction by a predetermined angle, so that the eccentric rod disengages from the upper surface of the fixed frame and releases the pressure on the moving roller assembly; Then control the locking motor to rotate in the forward direction, so that the eccentric rod presses down against the upper surface of the fixed frame again, so as to apply a secondary auxiliary thrust to the moving roller group, causing the moving roller group to apply clamping force to the round bar ingot again; If, after the second clamping cycle, the pressure sensor transmits a signal to the external controller, and if the pressure signal of that group of pressure sensors remains unchanged, it is determined that the corresponding round bar ingot extraction is abnormal, and the corresponding geared motor is controlled to stop running; the remaining groups that have not experienced abnormalities continue to perform the extraction action.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The casting rod lifting device and lifting method of the present invention uses a reduction motor installed on the fixed frame of the moving roller group to drive one of the rollers to rotate. The friction between the roller and the round casting rod is used to achieve automatic extraction. There is no need for manual hanging rings or wire rope binding, nor is there a need for manual unloading of rings or wire ropes, which greatly improves the extraction efficiency and avoids the safety risks of manual operation in dangerous areas.

[0016] 2. The casting rod lifting device and lifting method of the present invention, through the cooperative design of locking motor and eccentric rod, limits the moving roller group when the mounting frame is in a vertical state, so that the moving roller group and the top of the round bar ingot are kept at a preset distance to avoid interference; after unlocking, the distal end of the eccentric rod can press down against the upper surface of the fixing frame, apply a downward auxiliary thrust to the moving roller group, and ensure that the moving roller group overcomes the jamming and is reliably locked onto the round bar ingot. The structure is ingenious and the operation is reliable.

[0017] 3. The casting rod lifting device and lifting method of the present invention, by setting a pressure sensor on the positioning plate, can detect the pressure signal of the moving roller group in real time during the extraction process, accurately determine whether the moving roller group is effectively engaged with the round rod ingot, and trigger an alarm signal when the pressure signal remains unchanged, thereby realizing automatic detection and feedback of the extraction state and improving the reliability and safety of equipment operation.

[0018] 4. The casting rod lifting device and lifting method of the present invention, by setting a track between the conveyor roller conveyor and the casting well, sliding a railcar on the track, and rotating an installation frame on the railcar, uses the fixed roller group and moving roller group on the slide rod to clamp and pull out the round rod ingot, completely replacing the traditional overhead crane hoisting method. It eliminates the need for the height space occupied by the lifting tools and overhead crane hook, significantly reducing the height requirements of the factory building. It is especially suitable for the renovation of old factory buildings, which can greatly reduce the renovation cost. At the same time, it eliminates the need for manual unloading of rings or wire ropes, which can improve the extraction efficiency and ensure high operational safety. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the left-side structure of the present invention; Figure 3 This is a partial structural diagram of the present invention; Figure 4 for Figure 3 A schematic diagram of the left-side view structure; Figure 5 This is a schematic diagram of the structure during the lifting of the casting rod according to the present invention; Figure 6 This is a schematic diagram of the structure during the pushing of the casting rod according to the present invention.

[0020] In the diagram: 1. Rail, 2. Railcar, 21. Electro-hydraulic actuator, 3. Mounting bracket, 4. Slide rod, 5. Fixing bracket, 51. Roller, 52. Gear motor, 6. Positioning plate, 61. Pressure sensor, 7. Locking motor, 71. Eccentric rod, 8. Slide rail. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1-6 This invention provides a technical solution: a casting rod lifting device, comprising a track 1 arranged between a conveyor roller conveyor and a casting well, a track car 2 slidably mounted on the track 1, a mounting frame 3 rotatably mounted on the end of the track car 2 away from the conveyor roller conveyor, a plurality of sliding rods 4 corresponding to the casting openings of the casting well on the mounting frame 3, a fixed roller assembly mounted on the upper side of the sliding rod 4, and a movable roller assembly slidably mounted on the lower side of the sliding rod 4, both the fixed roller assembly and the movable roller assembly including a fixed frame 5, two rollers 51 rotatably mounted on the fixed frame 5, and the fixed frame 5 of the fixed roller assembly being fixedly connected to the sliding rod 4, and the fixed frame 5 of the movable roller assembly being fixedly connected to the track car 4. The frame 5 is slidably connected to the slide bar 4, and the fixed frame 5 of the moving roller group is equipped with a reduction motor 52 connected to one of the rollers 51. The reduction motor 52 drives the roller 51 near the conveyor roller to rotate. The railcar 2 is equipped with a slide rail 8 corresponding to the moving roller group. The reduction motor 52 on the fixed frame 5 of the moving roller group drives one of the rollers 51 to rotate. Automatic extraction is achieved by utilizing the friction between the roller 51 and the round bar ingot. There is no need for manual hanging rings or wire rope binding, nor is there a need for manual unloading of rings or wire ropes, which greatly improves the extraction efficiency and avoids the safety risks of manual operation in dangerous areas.

[0023] Furthermore, an electro-hydraulic actuator 21 is rotatably mounted on the railcar 2. The telescopic end of the electro-hydraulic actuator 21 is rotatably connected to the middle of the mounting frame 3. The mounting frame 3 is driven to flip from a vertical state to a horizontal state by the electro-hydraulic actuator 21. After being flattened, the reduction motor 52 is started again, causing the roller 51 of the moving roller group to move along the slide bar 4 during rotation. At the same time, the railcar 2 moves along the track 1 towards the conveyor roller conveyor, automatically pushing the horizontal round bar ingot onto the conveyor roller conveyor. This realizes full automation from extraction to transfer, without the need for manual intervention, and greatly reduces the number of personnel working in the dangerous areas of deep well casting.

[0024] Furthermore, the distance between the two rollers 51 on the fixed roller assembly is greater than the diameter of the round bar ingot.

[0025] Furthermore, a locking motor 7 is provided on the side of the mounting frame 3. The output shaft of the locking motor 7 is provided with an eccentric rod 71 that can limit the fixed frame 5 of the moving roller assembly. Through the cooperative design of the locking motor 7 and the eccentric rod 71, the moving roller assembly is limited when the mounting frame 3 is in a vertical state, so that the moving roller assembly and the top of the round bar ingot are kept at a preset distance to avoid interference. After unlocking, the distal end of the eccentric rod 71 can press down against the upper surface of the fixed frame 5 to apply a downward auxiliary thrust to the moving roller assembly, ensuring that the moving roller assembly overcomes the jamming and is reliably locked onto the round bar ingot. The structure is ingenious and the operation is reliable.

[0026] Furthermore, the lower side of the slide bar 4 is provided with a positioning plate 6 that supports the fixing frame 5 of the moving roller assembly. The upper surface of the positioning plate 6 is provided with a pressure sensor 61. By setting the pressure sensor 61 on the positioning plate 6, the pressure signal of the moving roller assembly is detected in real time during the extraction process. It can accurately determine whether the moving roller assembly is effectively engaged with the round bar ingot. When the pressure signal remains unchanged, an alarm signal is triggered, realizing automatic detection and feedback of the extraction state, and improving the reliability and safety of equipment operation.

[0027] like Figure 5 and Figure 6 As shown, a lifting method for a casting rod lifting device includes the following steps: S1. Drive the track car 2 to move along the track 1 to the set position of the casting well, so that the fixed roller group and the moving roller group are aligned with the round bar ingot in the casting well. At this time, the locking motor 7 drives the eccentric rod 71 to be in the limit state, blocking and limiting the fixed frame 5 of the moving roller group, so that the moving roller group and the top of the round bar ingot maintain a preset distance. S2. Start the locking motor 7 to drive the eccentric rod 71 to rotate and release the limit on the fixed frame 5. The fixed frame 5 of the moving roller group slides down along the slide rod 4 under the action of gravity. At the same time, the eccentric rod 71 presses down against the upper surface of the fixed frame 5 during the rotation process, and the auxiliary moving roller group is locked onto the round bar ingot. Then the locking motor 7 is reset. S3. Start the geared motor 52 to drive the roller 51 in the moving roller group to rotate. The friction between the roller 51 and the round bar ingot drives the round bar ingot to move upward until the round bar ingot is completely pulled out of the casting well. During the upward movement of the round bar ingot, the roller 51 of the fixed roller group plays a guiding role for the round bar ingot. S4. During the pulling process, the pressure sensor 61 on the positioning plate 6 detects the pressure signal of the moving roller group. If the pressure signal remains unchanged, it is determined that the round bar ingot has not been pulled out or the moving roller group has not been effectively engaged with the round bar ingot, and an alarm signal is triggered. S5. After the round bar ingot is completely pulled out, start the electro-hydraulic push rod 21 to drive the mounting frame 3 to rotate relative to the railcar 2, so that the mounting frame 3 flips from the vertical state to the horizontal state. S6. After the mounting frame 3 is flipped to a horizontal position, the reduction motor 52 is started again to drive the roller 51 of the moving roller group. During the rotation of the roller 51, it moves along the slide bar 4. At the same time, the railcar 2 moves along the track 1 towards the conveyor roller table. The horizontal round bar ingot is pushed onto the conveyor roller table through the moving roller group.

[0028] Furthermore, in S3, the two rollers 51 of the fixed roller group only roll in contact with the side wall of the round bar ingot and play a guiding role, without providing clamping driving force, and the distance between the two rollers 51 of the fixed roller group is greater than the diameter of the round bar ingot.

[0029] Furthermore, in S2, the eccentric rod 71 changes its contact position with the fixed frame 5 by rotating. When the distal end of the eccentric rod 71 rotates to the lower position, it presses down against the upper surface of the fixed frame 5, applying a downward auxiliary thrust to the moving roller assembly, so that the moving roller assembly overcomes the jamming and presses the round bar ingot.

[0030] Furthermore, in S4, when the pressure signal collected by the pressure sensor 61 remains unchanged, the locking motor 7 of the corresponding group drives the eccentric rod 71 to perform a secondary automatic clamping cycle, specifically: First, control the locking motor 7 to rotate in the opposite direction by a predetermined angle, so that the eccentric rod 71 disengages from the upper surface of the fixed frame 5 and releases the pressure on the moving roller assembly; Then control the locking motor 7 to rotate in the forward direction, so that the eccentric rod 71 presses down against the upper surface of the fixed frame 5 again, so as to apply a secondary auxiliary thrust to the moving roller group, and cause the moving roller group to apply clamping force to the round bar ingot again. If, after the second clamping cycle, the pressure sensor 61 transmits a signal to the external controller, and if the pressure signal of the pressure sensor 61 remains unchanged, it is determined that the corresponding round bar ingot extraction is abnormal, and the corresponding reduction motor 52 is controlled to stop running; the remaining groups that have not experienced abnormalities continue to perform the extraction action.

[0031] This invention, by setting a track 1 between the conveyor roller conveyor and the casting well, slides a railcar 2 on the track 1, and rotates a mounting frame 3 on the railcar 2, uses a fixed roller group and a moving roller group on a slide rod 4 to clamp and pull out round bar ingots, completely replacing the traditional overhead crane hoisting method. It eliminates the need for lifting tools and overhead crane hooks, significantly reducing the height requirements of the factory building, and is especially suitable for the renovation of old factory buildings, which can greatly reduce the renovation cost. At the same time, it eliminates the need for manual unloading of rings or wire ropes, which can improve the extraction efficiency and ensure high operational safety.

[0032] All parts not disclosed in this invention are prior art, and their specific structures, materials, and working principles will not be described in detail. 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 variations 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 casting rod lifting device, comprising a track (1) arranged between a conveyor roller conveyor and a casting well, characterized in that: A railcar (2) is slidably mounted on the track (1). A mounting frame (3) is rotatably mounted on the end of the railcar (2) away from the conveyor roller. The mounting frame (3) is provided with several sets of sliding rods (4) corresponding to the casting opening of the casting well. A fixed roller set is mounted on the upper side of the sliding rod (4), and a moving roller set is slidably mounted on the lower side of the sliding rod (4). Both the fixed roller set and the moving roller set include a fixed frame (5). Two rollers (51) are rotatably mounted on the fixed frame (5). The fixed frame (5) of the fixed roller set is fixedly connected to the sliding rod (4). The fixed frame (5) of the moving roller set is slidably connected to the sliding rod (4). A reduction motor (52) connected to one of the rollers (51) is provided on the fixed frame (5) of the moving roller set. The reduction motor (52) drives the roller (51) near the conveyor roller to rotate. The railcar (2) is provided with a slide rail (8) corresponding to the moving roller set.

2. The casting rod lifting device according to claim 1, characterized in that: An electro-hydraulic actuator (21) is rotatably mounted on the railcar (2), and the telescopic end of the electro-hydraulic actuator (21) is rotatably connected to the middle of the mounting frame (3).

3. The casting rod lifting device according to claim 2, characterized in that: The distance between the two rollers (51) on the fixed roller group is greater than the diameter of the round bar ingot.

4. The casting rod lifting device according to claim 3, characterized in that: The mounting bracket (3) is provided with a locking motor (7) on its side, and the output shaft of the locking motor (7) is provided with an eccentric rod (71) that can limit the fixed bracket (5) of the moving roller group.

5. The casting rod lifting device according to claim 4, characterized in that: The lower side of the slide bar (4) is provided with a positioning plate (6) that supports the fixed frame (5) of the moving roller assembly, and a pressure sensor (61) is provided on the upper surface of the positioning plate (6).

6. A lifting method based on the casting rod lifting device according to claim 5, characterized in that, Includes the following steps: S1. Drive the track car (2) to move along the track (1) to the set position of the casting well, so that the fixed roller group and the moving roller group are aligned with the round bar ingot in the casting well. At this time, the locking motor (7) drives the eccentric rod (71) to be in the limit state, blocking and limiting the fixed frame (5) of the moving roller group, so that the moving roller group and the top of the round bar ingot maintain a preset distance. S2. Start the locking motor (7) to drive the eccentric rod (71) to rotate and release the limit on the fixed frame (5). The fixed frame (5) of the moving roller group slides down along the slide bar (4) under the action of gravity. At the same time, the eccentric rod (71) presses down against the upper surface of the fixed frame (5) during the rotation process, and the auxiliary moving roller group is stuck on the round bar ingot. Then the locking motor (7) is reset. S3. Start the geared motor (52) to drive the roller (51) in the moving roller group to rotate. The friction between the roller (51) and the round bar ingot will drive the round bar ingot to move upward until the round bar ingot is completely pulled out of the casting well. During the upward movement of the round bar ingot, the roller (51) of the fixed roller group will guide the round bar ingot. S4. During the pulling process, the pressure sensor (61) on the positioning plate (6) detects the pressure signal of the moving roller group. If the pressure signal remains unchanged, it is determined that the round bar ingot has not been pulled out or the moving roller group has not been effectively engaged with the round bar ingot, and an alarm signal is triggered. S5. After the round bar ingot is completely pulled out, start the electro-hydraulic push rod (21) to drive the mounting frame (3) to rotate relative to the railcar (2), so that the mounting frame (3) flips from the vertical state to the horizontal state. S6. After the mounting frame (3) is flipped to a horizontal state, the geared motor (52) is started again to drive the roller (51) of the moving roller group. During the rotation of the roller (51), it moves along the slide bar (4). At the same time, the railcar (2) moves along the track (1) towards the conveying roller track. The horizontal round bar ingot is pushed onto the conveying roller track through the moving roller group.

7. The lifting method of the casting rod lifting device according to claim 6, characterized in that: In S3, the two rollers (51) of the fixed roller group only roll in contact with the side wall of the round bar ingot and play a guiding role, without providing clamping driving force, and the distance between the two rollers (51) of the fixed roller group is greater than the diameter of the round bar ingot.

8. The lifting method of the casting rod lifting device according to claim 6, characterized in that: In S2, the eccentric rod (71) changes its contact position with the fixed frame (5) by rotating. When the distal end of the eccentric rod (71) rotates to the lower position, it presses down against the upper surface of the fixed frame (5) to apply a downward auxiliary thrust to the moving roller assembly, so that the moving roller assembly overcomes the jamming and presses the round bar ingot.

9. The lifting method of the casting rod lifting device according to claim 6, characterized in that: In S4, when the pressure signal collected by the pressure sensor (61) remains unchanged, the locking motor (7) of the corresponding group drives the eccentric rod (71) to perform a second automatic clamping cycle, specifically: First, control the locking motor (7) to rotate in the opposite direction by a predetermined angle, so that the eccentric rod (71) is disengaged from the upper surface of the fixed frame (5) and the pressure on the moving roller group is released; Then control the locking motor (7) to rotate in the forward direction, so that the eccentric rod (71) presses down against the upper surface of the fixed frame (5) again, so as to apply a secondary auxiliary thrust to the moving roller group, and cause the moving roller group to apply clamping force to the round bar ingot again. If after the second clamping cycle, the pressure sensor (61) transmits the signal to the external controller. If the pressure signal of the pressure sensor (61) remains unchanged, it is determined that the corresponding round bar ingot is abnormal and the corresponding geared motor (52) is controlled to stop running. The remaining groups that have not experienced abnormalities continue to perform the extraction action.

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