A hoisting device and hoisting method for magnesium alloy hot-rolled plates

Abstract

The present application relates to magnesium alloy hot rolling technical field, specifically disclose a kind of hoisting device and hoisting method of magnesium alloy hot-rolled plate, including lifting frame, the top of the lifting frame is equipped with the lifting ring for crane hoisting, the inner side of lifting frame lower end is uniformly provided with rotatable roller shaft, the inner side of lifting frame upper end is equipped with the pusher frame corresponding with roller shaft, the top of pusher frame is connected with electro-hydraulic push rod, the electro-hydraulic push rod is fixed on lifting frame, for driving pusher frame moves along the axial direction of roller shaft, the bottom of pusher frame near the edge of lifting frame one end is equipped with top rod.The present application is inserted into the crack or burr gap naturally existing in magnesium alloy plate edge by the top rod of inclination arrangement, the edge is formed into buckling by being pushed up, and the interlocking structure between crack and top rod is used to prevent the plate from slipping or falling off during hoisting;The design breaks the technical prejudice of "avoiding contact crack" in the field, and converts the original defect into a beneficial positioning structure.

Description

Technical Field

[0001] This invention relates to the field of magnesium alloy hot rolling technology, specifically to a hoisting device and method for hot-rolled magnesium alloy plates. Background Technology

[0002] Magnesium alloys have a unique close-packed hexagonal crystal structure, and their plastic deformation must be carried out in a hot state. Therefore, the hot rolling temperature of magnesium alloy sheets is generally not lower than 380℃, and the temperature of processes such as straightening and finishing is not lower than 150-220℃. Hot-rolled magnesium alloy sheets usually cannot be cooled and must be directly subjected to subsequent finishing processes such as hot shearing, warm finishing rolling, and hot straightening using residual heat.

[0003] In the magnesium alloy hot rolling workshop, hot-rolled sheets need to be transferred between different processes, usually using a hook crane in the workshop. However, the crane hook cannot directly hook the flat hot-rolled sheets; a special lifting device (tooling) must be used to fix the sheets in place before the crane lifts them.

[0004] Currently, commonly used tools for hoisting metal sheets include:

[0005] Wire rope binding: After manually binding both ends of the sheet metal with two or more wire ropes, the crane hook hooks onto the wire rope buckles for lifting. This method is labor-intensive, inefficient, requires manual assistance for both loading and unloading, and poses significant safety hazards.

[0006] Vacuum suction cup device: Several suction cups are set on the upper surface of the sheet material, which is then lifted after adsorption. This method requires the sheet material temperature to be below 60℃; otherwise, the suction cup adsorption effect will be poor and the material will be easily aged and damaged. Magnesium alloy hot-rolled sheets must be kept hot at 150-220℃ and cannot be cooled, therefore vacuum suction cups are not suitable.

[0007] Clamping with calipers: This method involves clamping the two sides of the sheet metal with calipers and then lifting it with caliper hooks. This method requires the sheet metal to be thicker than 12mm and with flat, crack-free sides. However, magnesium alloys are prone to developing numerous cracks and irregular burrs on their edges during hot rolling. Even with a thickness exceeding 12mm, these cracks can prevent the calipers from reliably clamping the sheet metal, posing a safety risk of it falling off. For example, patent number CN216549308U discloses a heavy-duty sheet metal handling device that uses bidirectional side clamps to grip and handle high-temperature and finished sheet metal. This relies on the clamps applying clamping force to both sides of the sheet metal, requiring the sides to have a certain degree of flatness and strength. However, hot-rolled magnesium alloy sheets have numerous cracks and burrs on their sides, making it impossible for the clamps to reliably clamp them.

[0008] In summary, existing hoisting devices cannot simultaneously meet the hoisting requirements of hot-rolled magnesium alloy sheets, which are characterized by "high temperature (above 150-220℃)," "numerous cracks on the edges," and "variable thickness." Therefore, there is an urgent need for a safe and efficient hoisting device and method specifically designed for the characteristics of hot-rolled magnesium alloy sheets. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to overcome the existing defects and provide a hoisting device and method for hot-rolled magnesium alloy plates. By inserting an inclined top rod into the gaps of naturally existing cracks or burrs on the edge of the magnesium alloy plate, the edge is lifted upward to form a warp. The interlocking structure between the crack and the top rod prevents the plate from slipping or falling off during hoisting. This design breaks the technical prejudice of "avoiding contact with cracks" in the field and transforms the original defect into an advantageous positioning structure, which can effectively solve the problems in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a hoisting device for hot-rolled magnesium alloy plates, comprising a hoisting frame, wherein the top of the hoisting frame is provided with a lifting ring for hoisting by a crane, and rotatable rollers are uniformly arranged at the lower end of the inner side of the hoisting frame, wherein the rollers include a rotating shaft rotatably arranged on the hoisting frame and a bushing installed in the middle of the rotating shaft, and guide grooves extending axially are respectively provided at both ends of the bushing;

[0011] The upper inner side of the hoisting frame is provided with a pusher frame corresponding to the roller shaft. The top of the pusher frame is connected to an electro-hydraulic pusher rod, which is fixed on the hoisting frame and used to drive the pusher frame to move along the axial direction of the roller shaft. The bottom of the pusher frame near the edge of the hoisting frame is provided with a top rod. The bottom of the top rod is inclined towards the middle of the roller shaft, and the lower end of the top rod can be movably inserted into the guide groove at the end of the bushing.

[0012] As a preferred embodiment of the present invention, the number of rollers is three, and they are evenly distributed along the length of the lifting frame.

[0013] As a preferred embodiment of the present invention, the end of the top rod away from the lifting frame is a wedge-shaped structure so as to be inserted into the gaps of tiny cracks or burrs on the edge of the plate.

[0014] As a preferred embodiment of the present invention, a pressure roller is installed at the bottom of the pusher frame away from the lifting frame, which is used to press down the upper surface of the magnesium alloy hot-rolled plate when the pusher frame moves.

[0015] As a preferred embodiment of the present invention, a reduction motor is provided at the lower end of one side of the hoisting frame, and the output end of the reduction motor is connected to the end of the roller exposed on the outside of the hoisting frame to drive the roller to rotate.

[0016] A lifting method for a magnesium alloy hot-rolled sheet metal lifting device includes the following steps:

[0017] S1. Place the roller shaft of the hoisting device in the gap of the hot rolling conveyor roller table, with the top height of the roller shaft lower than the top height of the conveyor roller. Start the conveyor roller table to transport the magnesium alloy hot-rolled plate to the top of the roller shaft.

[0018] S2. Start the extension of the electro-hydraulic push rod, drive the push frame to move towards the plate, so that the pressure roller first contacts the upper surface of the plate and rolls from the edge to the center, while the push rod slides along the guide groove and contacts the side of the plate.

[0019] During the extension of the electro-hydraulic actuator, its thrust value and the warping state of the plate edge are monitored in real time. The extension of the electro-hydraulic actuator is stopped when any of the following conditions are met:

[0020] Firstly, the push rod is inserted into the existing cracks or burrs on the side of the board, and has already pushed the edge of the board upward to form a predetermined amount of warping deformation;

[0021] Secondly: there are no cracks or burrs on the side of the plate that the push rod contacts, the thrust of the electro-hydraulic push rod reaches the preset threshold, and at this time the edge of the plate has not yet undergone the preset amount of warping deformation.

[0022] S3. Hook the lifting ring with the crane hook, lift the entire lifting device along with the plate and transfer it to the next work station;

[0023] S4. At the next station, control the electro-hydraulic push rod to retract, and the push frame drives the top rod and pressure roller to reset. During the reset process, the pressure roller flattens the previously warped edge of the board.

[0024] S5. Start the geared motor to drive the roller shaft to rotate, and the roller shaft will transport the sheet material from the hoisting device to the subsequent process.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. The hoisting device and method for hot-rolled magnesium alloy plates according to the present invention adopts a purely mechanical structure, is not affected by high temperature, and can be hoisted directly at a temperature of 150-220°C or above after hot rolling of magnesium alloy, saving cooling waiting time and subsequent reheating energy consumption, and significantly improving production efficiency.

[0027] 2. The hoisting device and method for hot-rolled magnesium alloy plates of the present invention use an inclined top rod inserted into the gaps of naturally existing cracks or burrs on the edge of the magnesium alloy plate to lift the edge upward and form a warp. The interlocking structure between the crack and the top rod prevents the plate from slipping or falling off during hoisting. This design breaks the technical prejudice of "avoiding contact with cracks" in the field and transforms the original defect into an advantageous positioning structure.

[0028] 3. The hoisting device and method for hot-rolled magnesium alloy plates of the present invention, wherein the hoisting method sets two stopping conditions by real-time monitoring of the thrust of the electro-hydraulic push rod and the warping state of the plate edge; when a crack exists, the push rod is inserted into the crack and stops pushing after a preset warping occurs; when there is no crack, the push stops when the thrust reaches a preset threshold, thus avoiding forcibly bending the crack-free edge; this adaptive control ensures reliable locking when there is a crack and prevents damage to the plate when there is no crack.

[0029] 4. The hoisting device and method for hot-rolled magnesium alloy plates of the present invention, after hoisting, automatically flattens the previously raised warped parts during the retraction of the electro-hydraulic push rod, without the need for additional processes, ensuring the flatness of the plate and not affecting subsequent roller conveying and finishing processes such as straightening.

[0030] 5. The hoisting device and method for hot-rolled magnesium alloy plates of the present invention are automatically completed by electro-hydraulic actuators, geared motors, etc., during the entire hoisting process, including plate positioning, top rod insertion, warping locking, lifting and transfer, flattening and resetting, and roller output. No manual assistance is required to bind or remove the wire rope, which avoids the risk of burns to personnel in high-temperature environments and the hidden danger of heavy objects falling, greatly reduces labor intensity, and improves production safety. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the left-side structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the present invention arranged on the conveyor roller conveyor.

[0034] In the diagram: 1. Lifting frame, 2. Lifting ring, 3. Roller shaft, 31. Rotary shaft, 32. Bushing, 33. Guide groove, 4. Pushing frame, 41. Pressure roller, 42. Top rod, 5. Electro-hydraulic push rod, 6. Gear motor. Detailed Implementation

[0035] 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.

[0036] Please see Figure 1-3The present invention provides a technical solution: a hoisting device for hot-rolled magnesium alloy plates, including a hoisting frame 1, a hoisting ring 2 for hoisting by a crane on the top of the hoisting frame 1, and rotatable rollers 3 evenly arranged on the lower end of the inner side of the hoisting frame 1. The rollers 3 include a rotating shaft 31 rotatably arranged on the hoisting frame 1 and a bushing 32 installed in the middle of the rotating shaft 31. Guide grooves 33 extending axially are respectively opened at both ends of the bushing 32.

[0037] The upper inner side of the lifting frame 1 is provided with a pusher 4 corresponding to the roller 3. The top of the pusher 4 is connected to an electro-hydraulic push rod 5, which is fixed on the lifting frame 1 and is used to drive the pusher 4 to move along the axial direction of the roller 3. The bottom of the pusher 4 near the edge of the lifting frame 1 is provided with a top rod 42. The bottom of the top rod 42 is inclined towards the middle of the roller 3, and the lower end of the top rod 42 can be movably inserted into the guide groove 33 at the end of the bushing 32.

[0038] Furthermore, there are three rollers 3, which are evenly distributed along the length of the lifting frame 1.

[0039] Furthermore, the end of the top rod 42 away from the lifting frame 1 is a wedge-shaped structure so as to be inserted into the gaps of tiny cracks or burrs on the edge of the plate. By inserting the inclined top rod 42 into the gaps of naturally existing cracks or burrs on the edge of the magnesium alloy plate, the edge is pushed upward to form a warp. The interlocking structure between the crack and the top rod prevents the plate from slipping or falling off during the lifting process. This design breaks the technical prejudice of "avoiding contact with cracks" in the field and transforms the original defect into an advantageous positioning structure.

[0040] Furthermore, a pressure roller 41 is installed at the bottom of the pusher 4 away from the lifting frame 1, which is used to press down the upper surface of the magnesium alloy hot-rolled plate when the pusher 4 moves.

[0041] Furthermore, a reduction motor 6 is provided on the lower side of one side of the hoisting frame 1. The output end of the reduction motor 6 is connected to the end of the roller shaft 3 exposed on the outside of the hoisting frame 1, and is used to drive the roller shaft 3 to rotate.

[0042] A lifting method for a magnesium alloy hot-rolled sheet metal lifting device includes the following steps:

[0043] S1. Place the roller 3 of the hoisting device in the gap of the hot rolling conveyor roller table, and the top height of the roller 3 is lower than the top height of the conveyor roller. Start the conveyor roller table to transport the magnesium alloy hot-rolled plate to the top of the roller 3.

[0044] S2. Start the extension of the electro-hydraulic push rod 5, drive the push frame 4 to move towards the plate, so that the pressure roller 41 first contacts the upper surface of the plate and rolls from the edge to the center, while the push rod 42 slides along the guide groove 33 and contacts the side of the plate.

[0045] During the extension of the electro-hydraulic actuator 5, its thrust value and the warping state of the plate edge are monitored in real time. The extension of the electro-hydraulic actuator 5 is stopped when any of the following conditions are met:

[0046] Firstly: The push rod 42 is inserted into the existing cracks or burrs on the side of the plate, and has already lifted the edge of the plate upward to form a preset amount of warping deformation; specifically: for the case of "cracks": after the push rod is inserted into the crack, only a slight warping of 1 to 3 mm is required to form an effective lock. At this time, the elongation should be actively stopped to avoid excessive crack expansion or plate breakage; this warping deformation is judged by the inflection point of the curve of the relationship between the displacement and thrust of the electro-hydraulic push rod;

[0047] Secondly: There are no cracks or burrs on the side of the board that the push rod 42 contacts, the thrust of the electro-hydraulic push rod 5 reaches the preset threshold, and the edge of the board has not yet warped by the preset amount. Specifically: For the case of "no cracks": the push rod is pressed on the complete edge, the resistance is high, and the thrust rises rapidly to the preset threshold. If no warping is detected at this time, it means that the crack cannot be inserted and should be stopped. Only the lateral extrusion force of the pressure roller and the push rod provides partial limit to avoid forcibly bending the board.

[0048] S3. Hook the lifting ring 2 with the crane hook, lift the entire lifting device together with the plate and transfer it to the next work station;

[0049] S4. At the next station, control the electro-hydraulic push rod 5 to retract, and the push frame 4 drives the top rod 42 and pressure roller 41 to reset. During the reset process, the pressure roller 41 flattens the previously warped edge of the plate. After the hoisting is completed, the pressure roller 41 automatically flattens the previously lifted warped part during the retraction of the electro-hydraulic push rod 5. No additional process is required, ensuring the flatness of the plate and not affecting subsequent roller conveyor and finishing, straightening and other processes.

[0050] S5. Start the geared motor 6 to drive the roller 3 to rotate, and the roller 3 will transport the plate from the hoisting device to the subsequent process.

[0051] In this hoisting method, two stopping conditions are set by real-time monitoring of the thrust of the electro-hydraulic push rod 5 and the warping state of the plate edge. When there is a crack, the push rod 42 inserts into the crack and stops pushing after the preset warping occurs. When there is no crack, the push stops after the thrust reaches the preset threshold, avoiding forcibly bending the edge without cracks. This adaptive control ensures reliable locking when there is a crack and prevents damage to the plate when there is no crack.

[0052] The electro-hydraulic actuator 5 and the geared motor 6 used in this invention are conventional drive and actuation components in the art. Their specific structures, circuit connections and working methods are known technologies and will not be described in detail here.

[0053] This invention uses an inclined push rod 42 inserted into the naturally occurring cracks or burrs on the edge of a magnesium alloy sheet to lift the edge upwards, creating a warp. The interlocking structure between the crack and the push rod prevents the sheet from slipping or falling off during hoisting. This design breaks away from the technical bias of "avoiding contact with cracks," transforming a previous defect into a beneficial positioning structure. Furthermore, the entire hoisting process—including sheet positioning, push rod insertion, warping locking, lifting and transfer, flattening and resetting, and roller output—is automatically completed by an electro-hydraulic push rod 5 and a reduction motor 6, eliminating the need for manual assistance in binding or removing steel wire ropes. This avoids the risk of burns in high-temperature environments and the hazard of falling heavy objects, significantly reducing labor intensity and improving production safety.

[0054] 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 hoisting device for hot-rolled magnesium alloy plates, comprising a hoisting frame (1), characterized in that: The top of the hoisting frame (1) is provided with a lifting ring (2) for hoisting by a crane. The lower end of the inner side of the hoisting frame (1) is uniformly provided with rotatable rollers (3). The rollers (3) include a rotating shaft (31) rotatably mounted on the hoisting frame (1) and a bushing (32) installed in the middle of the rotating shaft (31). The two ends of the bushing (32) are respectively provided with guide grooves (33) extending along the axial direction. The upper inner side of the lifting frame (1) is provided with a pusher (4) corresponding to the roller (3). The top of the pusher (4) is connected to an electro-hydraulic push rod (5), which is fixed on the lifting frame (1) and is used to drive the pusher (4) to move along the axial direction of the roller (3). The bottom of the pusher (4) near the edge of the lifting frame (1) is provided with a top rod (42). The bottom of the top rod (42) is inclined towards the middle of the roller (3), and the lower end of the top rod (42) can be movably inserted into the guide groove (33) at the end of the bushing (32). The end of the top rod (42) away from the lifting frame (1) is a wedge structure so as to insert into the gap of small cracks or burrs on the edge of the plate. The bottom of the pusher (4) away from the lifting frame (1) is equipped with a pressure roller (41) for pressing the upper surface of the magnesium alloy hot-rolled plate when the pusher (4) moves.

2. The hoisting device for hot-rolled magnesium alloy plates according to claim 1, characterized in that: The number of rollers (3) is three, and they are evenly distributed along the length of the hoisting frame (1).

3. The hoisting device for hot-rolled magnesium alloy plates according to claim 2, characterized in that: A speed reduction motor (6) is provided on the lower side of one side of the hoisting frame (1). The output end of the speed reduction motor (6) is connected to the end of the roller shaft (3) exposed on the outside of the hoisting frame (1) to drive the roller shaft (3) to rotate.

4. A lifting method based on the lifting device for hot-rolled magnesium alloy plates according to claim 3, characterized in that, Includes the following steps: S1. Place the roller (3) of the hoisting device in the gap of the hot rolling conveyor roller table, and the top height of the roller (3) is lower than the top height of the conveyor roller. Start the conveyor roller table to transport the magnesium alloy hot-rolled plate to the top of the roller (3). S2. Start the electro-hydraulic push rod (5) to extend, drive the push frame (4) to move towards the plate, so that the pressure roller (41) first contacts the upper surface of the plate and rolls from the edge to the center, while the push rod (42) slides along the guide groove (33) and contacts the side of the plate. During the extension of the electro-hydraulic actuator (5), its thrust value and the warping state of the plate edge are monitored in real time. The extension of the electro-hydraulic actuator (5) is stopped when any of the following conditions are met: Firstly, the push rod (42) is inserted into the existing cracks or burrs on the side of the plate, and has already pushed the edge of the plate upward to form a preset amount of warping deformation; Secondly: there are no cracks or burrs on the side of the plate that the push rod (42) contacts, the thrust of the electro-hydraulic push rod (5) reaches the preset threshold, and at this time the edge of the plate has not yet undergone the preset amount of warping deformation. S3. Hook the lifting ring (2) with the crane hook, lift the entire lifting device together with the plate and transfer it to the next work station; S4. At the next work station, control the electro-hydraulic push rod (5) to retract, and the push frame (4) drives the top rod (42) and pressure roller (41) to reset. During the reset process, the pressure roller (41) flattens the previously warped edge of the plate. S5. Start the geared motor (6) to drive the roller (3) to rotate. The roller (3) will transport the plate from the hoisting device to the subsequent process.

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