Lift tube replacement device and replacement method

Abstract

The invention discloses a riser tube replacement device and method, and belongs to the technical field of aluminum alloy part casting. The device comprises a frame, a lifting transmission mechanism, a lifting beam and an electric control structure, and the frame is used for supporting the lifting transmission mechanism, the lifting beam and the electric control structure; the lifting transmission mechanism is connected with the frame and used for driving the lifting beam to move in the vertical direction. The lifting beam is connected with the lifting transmission mechanism and is used for bearing the riser tube assembly so as to drive the riser tube assembly to be separated from the crucible furnace; and the electric control system is used for controlling the operation of the lifting transmission mechanism. According to the device, the riser tube can be replaced without occupying a transfer trolley, so that the transfer trolley can be continuously used for other production links, and the overall production efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of aluminum alloy component casting, and particularly to a device and method for replacing a riser tube. Background Art

[0002] The casting of aluminum alloy components is a component forming process, which can be divided into gravity casting, low-pressure casting, differential pressure casting, high-pressure casting and other methods according to process characteristics. Among them, differential pressure casting is widely used in many fields such as aerospace and automobile manufacturing due to its high casting quality, stable and controllable filling, and wide production adaptability.

[0003] In the related art, the differential pressure casting equipment presses the molten aluminum in the crucible furnace into the mold through the riser tube to realize the cooling and forming of the molten aluminum. When the riser tube needs to be replaced, a transfer cart is used to pull out the crucible furnace, the furnace plate and the riser tube as a whole from the die casting machine, and then the replacement work of the riser tube is carried out on the transfer cart.

[0004] However, in the related art, replacing the riser tube on the transfer cart will occupy the transfer cart, resulting in the transfer cart being unable to be used for other production links at the same time, thus affecting the overall production efficiency. Summary of the Invention

[0005] This application provides a device and method for replacing a riser tube to solve the above problems. The technical solution is as follows: In the first aspect, a device for replacing a riser tube is provided. The device includes: a frame, a lifting transmission mechanism, a lifting beam, and an electric control structure, and is characterized in that: The frame is used to support the lifting transmission mechanism, the lifting beam and the electric control structure; The lifting transmission mechanism is connected to the frame and is used to drive the lifting beam to move in the vertical direction; The lifting beam is connected to the lifting transmission mechanism and is used to carry the riser tube assembly to drive the separation of the riser tube assembly and the crucible furnace; The electric control system is used to control the operation of the lifting transmission mechanism.

[0006] In a possible implementation, the frame includes a main frame, a crucible furnace track, a commutator fixing angle steel, a lifter fixing hollow steel, a guide rail fixing hollow steel, and a support seat fixing hollow steel; the main frame is a rectangular parallelepiped frame formed by welding square hollow steels, and fixing holes are provided on the hollow steel at the bottom surface of the frame, and the fixing holes are used to penetrate embedded bolts to fix the above-mentioned frame on the ground; the crucible furnace track is a continuous guiding structure formed by welding hollow steel and channel steel, the crucible furnace track is horizontally arranged inside the main frame, and one end of the crucible furnace track protrudes for docking with the transfer vehicle track; the commutator fixing angle steel is horizontally welded to the lower part of one side of the main frame, and the threaded holes on the commutator fixing angle steel are used to fix the speed change and commutation transmission box and the commutation transmission box of the lifting transmission mechanism; the lifter fixing hollow steel is horizontally welded between two adjacent hollow steels in the longitudinal direction of the main frame, and the fixing bottom plate with threaded holes of the lifter fixing hollow steel is used to install the turbine screw lifter of the lifting transmission mechanism; the guide rail fixing hollow steel is vertically fixed on the lifter fixing hollow steel, and the threaded holes on the guide rail fixing hollow steel are used to install the linear guide rail of the lifting transmission mechanism; the support seat fixing hollow steel is horizontally fixed on the top of the guide rail fixing hollow steel, and the threaded holes of the support seat fixing hollow steel are used to fix the support seat to form a floating support at the top of the screw.

[0007] In a possible implementation, the lifting transmission mechanism includes: a motor, the speed change and commutation transmission box, the commutation transmission box, a coupling, a connecting shaft, a turbine screw lifter, the linear guide rail, a slider, and the support seat; the motor is directly connected to the speed change and commutation transmission box through the coupling and is used to receive an electric control signal to start power output; the speed change and commutation transmission box drives the two commutation transmission boxes through the connecting shaft and is used to convert single-axis input into double-axis synchronous output; the output shafts at both ends of the commutation transmission box are respectively connected to the turbine screw lifters on both sides through couplings and are used to achieve symmetric drive of the lifting motion; the screw of the turbine screw lifter forms a screw drive with the nut of the lifting beam and is used to convert rotational motion into linear lifting; the linear guide rail is connected to the side surface of the lifting beam through the slider and is used to restrict the lifting beam to move only in the vertical direction; the support seat is used to support the top end of the screw.

[0008] In a possible implementation, the lifting beam includes: a beam body, a nut insert sleeve, a fixed fork, a two-way fork, a large pin, a spring, a screw, and a small pin; the beam body is a structure made of hollow steel, and the beam body includes a large central circular hole, symmetric square holes, alignment circular holes, an end groove, a large perforated ear plate and a small perforated ear plate located at the same end of the end groove. The large central circular hole is used to insert the nut insert sleeve, and the threaded holes evenly distributed around the large central circular hole are used for bolt-fixing the nut. The symmetric square holes and the alignment circular holes are used to pass bolts to fix the slider; the end groove is used to install the large pin, and the large perforated ear plate is used to install the small pin; one end of the nut insert sleeve is flush with the beam body, and the other end protrudes, which is used to transmit the spiral driving force to drive the lifting beam to move; the fixed fork is fixed at the end of the beam body opposite to the end groove, which is used to provide a fixed-end reference; the two-way fork includes a large arc end, a small arc end, a countersunk hole located at the small arc end, and a circular hole close to the small arc end; the large arc end is used to contact the liquid-riser assembly; the circular hole is used to penetrate the small pin to connect the large perforated ear plate to form a rotation fulcrum; the countersunk hole is used to connect one end of the spring through the screw; the top surfaces of the two-way fork and the fixed fork are on the same horizontal plane, and the horizontal plane is lower than the bottom surface of the furnace plate in the liquid-riser assembly; the other end of the spring is fixed on the small perforated ear plate through the large pin, which is used to provide a reset elastic force.

[0009] In a possible implementation, the electric control system includes: a dual-circuit power supply unit, which consists of a motor power switch and a control power switch, and is respectively connected to the power circuit and the control circuit through independent circuit breakers; a motion control unit, which includes a rising button and a falling button. The normally open contact of the rising button is connected in series with the rising contactor, and the normally open contact of the falling button is connected in series with the falling contactor coil, which is used to manually trigger the vertical movement of the lifting beam; an interlock protection unit, the auxiliary normally closed contacts of the rising contactor and the falling contactor are cross-connected in each other's control circuits, which is used to prevent the forward and reverse rotation commands from being triggered simultaneously; a multi-level limit unit, which includes: a rising-in-place switch and a falling-in-place switch are respectively installed at the high and low set positions of the lifting beam, which are used to automatically cut off the power supply of the corresponding direction contactor; a rising limit switch and a falling limit switch are set outside the corresponding in-place switch, which are used to directly cut off the main circuit to achieve hard-wired protection.

[0010] In a possible implementation, the device further includes: a safety fence and a ladder surrounding the periphery of the frame.

[0011] In a second aspect, a method for replacing a liquid-riser is provided, and the method includes: When it is confirmed by the descending in-place switch of the electric control system that the lifting beam is in the starting position, operate the transfer cart to move the tooling assembly integrated with the liquid-riser pipe assembly and the crucible furnace to the docking station of the crucible furnace track; Push the tooling assembly along the crucible furnace track into the liquid-riser pipe replacement device, and jointly support the furnace plate of the liquid-riser pipe assembly by the two-way fork and the fixed fork of the lifting beam; Trigger the ascending button of the electric control system to drive the lifting transmission mechanism to lift the lifting beam until the ascending in-place switch is triggered and stops; Move the crucible furnace out along the crucible furnace track; Trigger the descending button of the electric control system to make the lifting beam return to the starting position; Replace the liquid-riser pipe in the liquid-riser pipe assembly to obtain the replaced liquid-riser pipe assembly; Trigger the ascending button of the electric control system to drive the lifting transmission mechanism to lift the lifting beam to drive the replaced liquid-riser pipe assembly until the ascending in-place switch is triggered and stops; Operate the transfer cart to move the crucible furnace to the docking station of the crucible furnace track; Push the crucible furnace along the crucible furnace track into the liquid-riser pipe replacement device; Trigger the descending button of the electric control system to make the lifting beam drive the replaced liquid-riser pipe assembly return to the starting position, and obtain the replaced tooling assembly after the combination of the replaced liquid-riser pipe assembly and the crucible furnace; Move the replaced tooling assembly out along the crucible furnace track to the die-casting station.

[0012] The technical solution provided by this application at least brings the following beneficial effects: The technical solution provided by this application can complete the replacement of the liquid-riser pipe without occupying the transfer cart, avoiding the situation of the transfer cart being occupied, enabling the transfer cart to continue to be used in other production links, thereby improving the overall production efficiency. The operator can carry out the liquid-riser pipe replacement work with the assistance of this device, without performing complex and dangerous operations on the transfer cart, reducing the safety risks caused by poor operating environments, and ensuring the personal safety of the operator. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0014] Figure 1 It is the overall assembly schematic diagram of a liquid-riser pipe replacement device provided by this application; Figure 2 It is a schematic structural diagram of a framework provided by this application; Figure 3 It is a schematic structural diagram of a lifting transmission mechanism provided by this application; Figure 4 It is a schematic structural diagram of a lifting beam provided by this application; Figure 5 It is a schematic structural diagram of an electrical system provided by this application; Figure 6 It is a schematic structural diagram of the docking of a liquid riser replacement device and a transfer vehicle provided by this application; Figure 7 It is a schematic diagram of the state of a push-pull crucible furnace provided by this application; Figure 8 It is a top view of a lifting transmission mechanism, a lifting beam, and a crucible furnace plate assembly provided by this application.

[0015] Reference numerals: main frame 11, crucible furnace track 12, commutator fixing angle steel 13, lifter fixing hollow steel 14, guide rail fixing hollow steel 15, support seat fixing hollow steel 16, motor 21, speed change and commutation transmission box 22, commutation transmission box 23, turbine screw lifter 24, support seat 25, linear guide rail 26, slider 27, coupling 28, connecting shaft 29, beam body 31, nut embedding sleeve 32, fixed fork 33, two-way fork 34, large pin 35, spring 36, screw 37, small pin 38, liquid riser 41, furnace plate 42, crucible furnace 43, transfer vehicle 44, motor power supply Q1, control power supply Q2, up button S1, down button S2, up contactor K0, down contactor K1, up in-place switch SL1, up limit switch SL2, down in-place switch SL3, down limit switch SL4. Detailed implementation manners

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following will further describe this application in detail with reference to the accompanying drawings.

[0017] It should be noted that the terms "first", "second", etc. (if any) in the specification of this application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with this application. On the contrary, they are only examples of the application consistent with some aspects of this application.

[0018] As one of the key processes for forming parts, the casting of aluminum alloy parts can be mainly divided into various forms such as gravity casting, low-pressure casting, differential pressure casting, and high-pressure casting according to different process characteristics. Among them, differential pressure casting is widely used in many important fields such as aerospace and automotive manufacturing due to its many advantages such as high casting quality, stable and controllable filling process, and strong production adaptability.

[0019] For the traditional differential pressure casting process, differential pressure casting equipment usually uses a riser tube to press the aluminum liquid in the crucible furnace into the mold, and then completes the cooling and forming process of the aluminum liquid. However, in actual production scenarios, when the riser tube needs to be replaced, the commonly used process is to use a transfer cart to pull out the crucible furnace, the furnace plate, and the riser tube from the die-casting machine together, and then carry out the replacement operation of the riser tube on the transfer cart. Such an operation process exposes many drawbacks.

[0020] On the one hand, the transfer cart is occupied for a long time during the replacement of the riser tube, resulting in its inability to be simultaneously put into other key production links, which slows down the overall production progress and affects the improvement of production efficiency. On the other hand, when the operator carries out the operation of replacing the riser tube on the transfer cart, due to the limited operation space and complex operation environment, it is often necessary to operate difficultly at a certain height and in a specific environment, which undoubtedly increases the complexity and danger of the operation, there are relatively large safety hazards, and threatens the personal safety of the operator. Based on the above problems, there is an urgent need for an innovative riser tube replacement device to optimize the replacement process, improve production efficiency and ensure operation safety.

[0021] This application provides a riser tube replacement device, which avoids the situation of the transfer cart being occupied, enables the transfer cart to continue to be used in other production links, and thus improves the overall production efficiency. See Figure 1 , Figure 1 is the overall assembly schematic diagram of a riser tube replacement device provided by this application. Among them, Figure 1 A in is the front view of the overall assembly of the riser tube replacement device, Figure 1 B in is the left view of the overall assembly of the riser tube replacement device, Figure 1 C in is the top view of the overall assembly of the riser tube replacement device.

[0022] The riser tube replacement device includes: a frame, a lifting transmission mechanism, a lifting beam, and an electric control structure. The frame is used to support the lifting transmission mechanism, the lifting beam, and the electric control structure; the lifting transmission mechanism is connected to the frame and is used to drive the lifting beam to move in the vertical direction; the lifting beam is connected to the lifting transmission mechanism and is used to carry the riser tube assembly to drive the separation of the riser tube assembly and the crucible furnace; the electric control system is used to control the operation of the lifting transmission mechanism.

[0023] The frame serves as the support structure of the entire device. It not only provides a stable installation platform for the lifting drive mechanism, the lifting beam, and the electrical control structure but also ensures the stability and reliability of the entire device during operation. The design of the frame needs to consider the load-bearing capacity and rigidity to adapt to different weights of the liquid-raising pipe assemblies and crucible furnaces while ensuring smoothness during the lifting operation.

[0024] The lifting drive mechanism is closely connected to the frame and is the core component for realizing the lifting function. Through mechanical transmission, such as gear transmission, screw drive, or other suitable transmission methods, the power is converted into the vertical movement of the lifting beam. The design of the lifting drive mechanism needs to ensure the smoothness and accuracy of the lifting process to avoid causing unnecessary stress or damage to the liquid-raising pipe assemblies and crucible furnaces during the lifting process.

[0025] The lifting beam is connected to the lifting drive mechanism. The main function of the lifting beam is to carry the liquid-raising pipe assemblies. It moves vertically under the drive of the lifting drive mechanism, thereby realizing the separation of the liquid-raising pipe assemblies from the crucible furnace. The design of the lifting beam needs to consider the adaptability to the liquid-raising pipe assemblies to ensure that the liquid-raising pipe assemblies can be stably placed on the lifting beam during the lifting process without sliding or tilting. At the same time, the strength and rigidity of the lifting beam are also key factors to bear the weight of the liquid-raising pipe assemblies and maintain the structural integrity.

[0026] The electrical control system serves as the control center of the entire device. The electrical control system is responsible for precisely controlling the operation of the lifting drive mechanism. Through preset programs and control logics, precise control of the lifting speed, lifting height, and stop position is achieved. The electrical control system has high reliability and safety to ensure the safety of the operators and the normal operation of the equipment. In addition, the electrical control system can also integrate various sensors and monitoring devices to real-time monitor the operation status of the device and issue alarms or take corresponding safety measures in case of abnormal situations.

[0027] In a possible implementation, refer to Figure 2 the schematic structural diagram of a frame shown in Figure 2 where A in Figure 2 is the front view of the frame, Figure 2 B in

[0028] The frame includes a main frame 11, a crucible furnace track 12, a commutator fixing angle steel 13, a lifter fixing hollow steel 14, a guide rail fixing hollow steel 15, and a support base 25 fixing hollow steel 16; the main frame 11 is a cuboid frame formed by welding square hollow steels, and fixing holes are provided on the bottom hollow steel of the frame, and the fixing holes are used to penetrate embedded bolts to fix the above-mentioned frame on the ground; the crucible furnace track 12 is a continuous guiding structure formed by welding hollow steel and channel steel, the crucible furnace track 12 is horizontally arranged inside the main frame 11, and one end of the crucible furnace track 12 protrudes for docking with the transfer car track; the commutator fixing angle steel 13 is horizontally welded to the lower part of one side of the main frame 11, and the threaded holes on the commutator fixing angle steel 13 are used to fix the speed change and commutation transmission box 22 and the commutation transmission box 23 of the lifting transmission mechanism; the lifter fixing hollow steel 14 is horizontally welded between two adjacent hollow steels in the longitudinal direction of the main frame 11, and the fixing bottom plate with threaded holes of the lifter fixing hollow steel 14 is used to install the turbine screw lifter of the lifting transmission mechanism; the guide rail fixing hollow steel 15 is vertically fixed on the lifter fixing hollow steel 14, and the threaded holes on the guide rail fixing hollow steel 15 are used to install the linear guide rail 26 of the lifting transmission mechanism; the support base 25 fixing hollow steel 16 is horizontally fixed on the top of the guide rail fixing hollow steel 15, and the threaded holes of the support base 25 fixing hollow steel 16 are used to fix the support base 25 to form a floating support at the top of the lead screw. Among them, the support base 25 and the linear guide rail 26 can be referred to Figure 3 。

[0029] The main frame 11 is the basic support structure of the whole device, and a cuboid frame is formed by using square hollow steels through a welding process. It not only provides high strength and rigidity but also maintains the light weight of the structure. Fixing holes are designed on the bottom hollow steel of the frame, and the fixing holes are used to penetrate embedded bolts, so as to firmly fix the whole frame on the ground. It ensures the stability of the device during operation and prevents the device from displacement or shaking due to external forces or vibrations during operation.

[0030] The crucible furnace track 12 is a guiding structure specially designed for the movement of the crucible furnace 43. It is formed by welding hollow steel and channel steel to form a continuous guiding track. The track is horizontally arranged inside the main frame 11 to ensure that the crucible furnace 43 can move smoothly within the frame. One end of the track is specially designed to be convex so as to achieve precise docking with the transfer car track. The docking design allows the crucible furnace 43 to be transferred smoothly between the transfer car 44 and the device, which greatly facilitates the replacement operation of the riser pipe 41 and improves work efficiency. The commutator fixing angle steel 13 is horizontally welded to the lower part of one side of the main frame 11. Threaded holes are designed on it, and the threaded holes are used to fix the speed change and commutation transmission box 22 and the commutation transmission box 23 of the lifting transmission mechanism. It ensures the stable installation and reliable operation of the speed change and commutation transmission box 22. Among them, the crucible furnace 43, the riser pipe 41 and the transfer car 44 can be referred to Figure 6 。

[0031] The elevator mounting hollow steel bar 14 is welded transversely between two adjacent longitudinal hollow steel bars of the main frame 11. It features a fixed base plate with threaded holes for mounting the worm screw lifter of the lift transmission mechanism. The worm screw lifter is a core component of the lift transmission mechanism, and the stability and accuracy of its installation directly impact the lifting performance of the lift beam. This design provides a stable mounting base for the worm screw lifter, ensuring a smooth and precise lifting process.

[0032] The guide rail fixed hollow steel 15 is vertically fixed on the lifter fixed hollow steel 14. Threaded holes are designed on it for installing the linear guide rail 26 of the lifting transmission mechanism. The linear guide rail 26 ensures that the lifting beam moves smoothly in the vertical direction. The design and installation method of the guide rail fixed hollow steel 15 ensure the installation accuracy and stability of the linear guide rail 26, thereby ensuring the linear movement of the lifting beam during the lifting process and avoiding possible deviation or shaking. The support seat 25 fixed hollow steel 16 is horizontally fixed on the top of the guide rail fixed hollow steel 15. It also has threaded holes, which are used to fix the support seat 25, thereby forming a floating support at the top of the screw. It is crucial for the stable operation of the screw, especially when the screw is rotating. The floating support can effectively reduce the vibration and bending of the screw, and improve the service life and working accuracy of the screw.

[0033] Through the coordinated design and precise configuration of the above-mentioned parts, the framework of the riser tube replacement device not only provides solid mechanical support, but also lays the foundation for the efficient, stable and safe operation of the entire device through the reasonable layout and functional design of each component.

[0034] In one possible implementation, see Figure 3 A structural diagram of a lifting transmission mechanism is shown in FIG. Figure 3 A in the figure is the main view of the lifting transmission mechanism. Figure 3 B in the figure is the left view of the lifting transmission mechanism. Figure 3In [description], C is the top view of the lifting drive mechanism. The lifting drive mechanism includes: a motor 21, a speed-changing and reversing gearbox 22, a reversing gearbox 23, a coupling 28, a connecting shaft 29, a ball screw lifter, a linear guide 26, a slider 27, and a support seat 25; the motor 21 is directly connected to the speed-changing and reversing gearbox 22 through the coupling 28 and is used to receive an electric control signal to start power output; the speed-changing and reversing gearbox 22 drives the two reversing gearboxes 23 through the connecting shaft 29 and is used to convert a single-axis input into a double-axis synchronous output; the output shafts at both ends of the reversing gearbox 23 are respectively connected to the ball screw lifters on both sides through the coupling 28 and are used to achieve symmetric drive of the lifting motion; the screw of the ball screw lifter forms a screw drive with the nut of the lifting beam and is used to convert rotational motion into linear lifting; the linear guide 26 is connected to the side of the lifting beam through the slider 27 and is used to restrict the lifting beam to move only in the vertical direction; the support seat 25 is used to support the top end of the screw.

[0035] The motor 21 serves as the power source of the entire lifting drive mechanism and is directly connected to the speed-changing and reversing gearbox 22 through the coupling 28. The motor 21 receives signals from the electric control system and outputs rotational power after starting. The connection method of the coupling 28 ensures efficient and stable power transmission between the motor 21 and the speed-changing and reversing gearbox 22, reducing energy loss and vibration interference during power transmission. The speed-changing and reversing gearbox 22 is a key component for power conversion and distribution. It receives the single-axis rotational power input from the motor 21 and performs speed change and reversing processing through the internal gear set. The speed-changing function can adjust the transmission speed according to actual operation requirements to adapt to the lifting requirements of the liquid-lifting pipe assembly and the crucible furnace 43 with different weights. The reversing function converts the rotational power of the motor 21 into a direction suitable for subsequent transmission.

[0036] The connecting shaft 29 is the power transmission bridge between the speed-changing and reversing gearbox 22 and the reversing gearbox 23. It transmits the power output by the speed-changing and reversing gearbox 22 to the two reversing gearboxes 23 through rotational motion. The connecting shaft 29 has sufficient strength and precision to ensure stable power transmission under high-speed rotation, and its design needs to consider balance and torsional strength to avoid vibration and deformation during transmission. The reversing gearboxes 23 are installed at both ends of the connecting shaft 29, and their function is to further convert and distribute power. The output shafts at both ends of each reversing gearbox 23 are respectively connected to the ball screw lifters on both sides through the coupling 28. The gear set design inside the reversing gearbox 23 ensures uniform power distribution and synchronous output, enabling the ball screw lifters on both sides to perform lifting motion synchronously. The synchronous drive design is crucial for ensuring the smooth operation of the lifting beam, preventing tilting or jamming of the lifting beam caused by uneven power transmission.

[0037] The worm screw lifter is a key component that converts rotational motion into linear motion. Each lifter contains a worm and a screw, and the worm and the screw cooperate with each other through a spiral transmission. When the rotational power of the output shaft of the reversing transmission box 23 is transmitted to the worm screw lifter, the worm drives the screw to rotate. The screw and the nut on the lifting beam form a spiral pair, which converts the rotational motion of the screw into the linear motion of the nut, thereby driving the lifting beam to rise or fall. The design of the worm screw lifter needs to take into account the load capacity, transmission efficiency and self-locking performance to ensure that it can withstand large loads during the lifting process, and ensure that the lifting beam will not slide down due to its own weight when it stops at any position.

[0038] The linear guide 26 is a guide system that ensures that the lifting beam moves only in the vertical direction. The guide rail is connected to the side of the lifting beam through the slider 27, which slides on the guide rail, thereby constraining the movement trajectory of the lifting beam. The design of the linear guide 26 and the slider 27 needs to have high precision and high rigidity to reduce the gap and shaking during movement and ensure the linear motion accuracy of the lifting beam. In addition, the lubrication and wear resistance of the guide rail and the slider 27 are also crucial to extend the service life and reduce maintenance costs. The support seat 25 is the support structure at the top of the screw of the turbine screw lifter. It provides additional radial and axial support for the screw to ensure that the screw maintains straightness when rotating and bearing axial loads. The design of the support seat 25 needs to take into account its strength and stability to adapt to the working state of the screw under high-speed rotation and heavy load conditions. At the same time, the support seat 25 may also include components such as bearings to reduce friction between the screw and the support seat 25 and improve transmission efficiency.

[0039] The lifting mechanism, through the coordinated operation of a motor 21, a variable-speed reversing transmission box 22, a connecting shaft 29, a reversing transmission box 23, a worm screw lifter, a linear guide 26, a slider 27, and a support base 25, achieves smooth, precise, and reliable vertical movement of the lifting beam during lift tube replacement. The design and integration of each component have been meticulously considered to ensure efficient operation and adaptability to the diverse operating conditions and load requirements of industrial environments.

[0040] In one possible implementation, see Figure 4 A structural diagram of a lifting beam is shown in FIG. Figure 4 B in the figure is the main view of the lifting beam. Figure 4 The A in Figure 4Left view of the S part of B in []. The lifting beam includes: a beam body 31, a nut insert sleeve 32, a fixed fork 33, a two-way fork 34, a large pin 35, a spring 36, a screw 37, and a small pin 38; the beam body 31 is a structure made of hollow steel, and the beam body 31 includes a central large round hole, symmetric square holes, alignment round holes, end grooves, a large perforated ear plate and a small perforated ear plate at the same end of the end grooves. The central large round hole is used to insert the nut insert sleeve 32, and the threaded holes evenly distributed around the central large round hole are used for bolt fixation of the nut. The symmetric square holes and alignment round holes are used to pass through bolts to fix the slider 27; the end grooves are used to install the large pin 35, and the large perforated ear plate is used to install the small pin 38; one end of the nut insert sleeve 32 is flush with the beam body 31, and the other end protrudes, which is used to transmit the spiral driving force to drive the lifting beam to move; the fixed fork 33 is fixed at the end of the beam body 31 opposite to the end groove, which is used to provide a fixed end reference; the two-way fork 34 includes a large arc end, a small arc end, a countersunk hole at the small arc end, and a round hole near the small arc end; the large arc end is used to contact the liquid lifting pipe assembly; the round hole is used to insert the small pin 38 to connect the large perforated ear plate to form a rotation fulcrum; the countersunk hole is used to connect one end of the spring 36 through the screw 37; the top surfaces of the two-way fork 34 and the fixed fork 33 are on the same horizontal plane, and the horizontal plane is lower than the bottom surface of the furnace plate 42 in the liquid lifting pipe assembly; the other end of the spring 36 is fixed on the small perforated ear plate through the large pin 35, which is used to provide a reset elastic force.

[0041] The beam body 31 is the main structure of the lifting beam and is made of hollow steel, which reduces the weight while ensuring the structural strength. A variety of holes and grooves are designed on the beam body 31 to meet different functional requirements. The central large round hole is used to insert the nut insert sleeve 32. The threaded holes evenly distributed around the central large round hole are used to fix the nut through bolts, ensuring the stability and reliability of the nut inside the beam body 31. The symmetric square holes and alignment round holes are used to pass through bolts to fix the slider 27. The slider 27 cooperates with the linear guide 26 to ensure the smooth movement of the lifting beam in the vertical direction. The end grooves are located at the large perforated ear plate and the small perforated ear plate at the same end of the beam body 31. The end grooves are used to install the large pin 35, and the large perforated ear plate is used to install the small pin 38. These components play a key role in the connection and movement of the two-way fork 34.

[0042] One end of the nut insert sleeve 32 is flush with the beam body 31, and the other end protrudes. Its protruding part is used to form a spiral with the lead screw of the turbine screw lifter, thereby converting the rotational motion of the lead screw into the linear motion of the lifting beam. The design of the nut insert sleeve 32 needs to consider wear resistance and accuracy to ensure long-term stable transmission effect. The fixed fork 33 is installed at the end of the beam body 31 opposite to the end groove, and its main function is to provide a fixed reference point. During the connection process of the liquid lifting pipe assembly and the lifting beam, the fixed fork 33 helps to position and stabilize the liquid lifting pipe assembly, ensuring the accuracy and reliability of the connection.

[0043] The two-way fork 34 is a unique design on the lifting beam, used to achieve the connection and release of the liquid lifting pipe assembly. It has a large arc end and a small arc end. The large arc end is designed to contact the liquid lifting pipe assembly, and its arc surface helps to guide and position the liquid lifting pipe assembly, ensuring the smoothness of the connection. The countersunk hole is located at the small arc end and is used to connect one end of the spring 36 through the screw 37; the round hole is close to the small arc end and is used to insert the small pin 38 to connect the large perforated ear plate, forming the rotation fulcrum of the two-way fork 34. This design enables the two-way fork 34 to automatically reset under the action of the spring 36, facilitating the quick connection and release of the liquid lifting pipe assembly.

[0044] The large pin 35 is installed in the end groove and is used to fix the other end of the spring 36, and is connected through the hole on the small perforated ear plate to provide the reset elastic force. The small pin 38 is installed on the large perforated ear plate and is used to connect the round hole of the two-way fork 34 to form the rotation fulcrum of the two-way fork 34. One end of the spring 36 is connected to the countersunk hole of the two-way fork 34 through the screw 37, and the other end is fixed to the small perforated ear plate through the large pin 35. The spring 36 provides the reset elastic force to ensure that the two-way fork 34 remains in the initial position without external force, thereby realizing the automatic release of the liquid lifting pipe assembly. The screw 37 is used to connect the spring 36 and the two-way fork 34 to ensure the firmness and reliability of the connection.

[0045] Through the coordinated action of the beam body 31, the nut embedding sleeve 32, the fixed fork 33, the two-way fork 34, the large pin 35, the spring 36, the screw 37 and the small pin 38 in the design of the lifting beam, the quick, accurate and stable connection and release of the liquid lifting pipe assembly are realized. This design not only improves the efficiency of liquid lifting pipe replacement, but also ensures the safety and reliability of the operation. Through the ingenious combination of the two-way fork 34 and the spring 36, the lifting beam can flexibly respond under different working conditions and adapt to the replacement requirements of various liquid lifting pipe assemblies.

[0046] In a possible implementation manner, refer to Figure 5 the structural schematic diagram of an electrical system shown in Figure 5 Note that the structural schematic diagram of the electrical system shown is only an example, and other electrical systems that can implement the electrical control function in the embodiments of the present application are all acceptable.

[0047] The electric control system includes: a dual-circuit power supply unit, which consists of a motor power supply Q1 switch and a control power supply Q2 switch, and is respectively connected to the power circuit and the control circuit through independent circuit breakers; a motion control unit, which includes a rising button S1 and a falling button S2. The normally open contacts of the rising button S1 are connected in series with the rising contactor K0, and the normally open contacts of the falling button S2 are connected in series with the coil of the falling contactor K1, for manually triggering the vertical movement of the lifting beam; an interlock protection unit, where the auxiliary normally closed contacts of the rising contactor K0 and the falling contactor K1 are cross-connected in each other's control circuits, for preventing simultaneous triggering of forward and reverse commands; a multi-level limit unit, which includes: a rising-in-place switch SL1 and a falling-in-place switch SL3 are respectively installed at the high and low set positions of the lifting beam, for automatically cutting off the power supply of the corresponding direction contactor; a rising limit switch SL2 and a falling limit switch SL4 are set outside the corresponding in-place switches, for directly cutting off the main circuit to achieve hard-wired protection.

[0048] The dual-circuit power supply unit is the basis of the electric control system and consists of a motor power supply Q1 switch and a control power supply Q2 switch. These two switches are respectively connected to the power circuit and the control circuit through independent circuit breakers to provide stable power supply. When a fault occurs in one circuit or maintenance is required, the other circuit can still maintain the basic operation of the device, enhancing the reliability and safety of the system.

[0049] The motion control unit is the interface for operators to directly interact with the device, including a rising button S1 and a falling button S2. The normally open contacts of the rising button S1 are connected in series with the rising contactor K0, while the normally open contacts of the falling button S2 are connected in series with the coil of the falling contactor K1. When the operator presses the rising button S1, the rising contactor K0 is activated to drive the lifting beam to move upward; similarly, when the falling button S2 is pressed, the falling contactor K1 is activated to drive the lifting beam to move downward. This design facilitates the operator to quickly and accurately control the movement of the lifting beam when needed.

[0050] The interlock protection unit is a key safety component in the electric control system for preventing simultaneous triggering of forward and reverse commands. The auxiliary normally closed contacts of the rising contactor K0 and the falling contactor K1 are cross-connected in each other's control circuits. This interlock mechanism ensures that the rising contactor K0 and the falling contactor K1 will not be activated simultaneously, preventing equipment damage or safety accidents that may be caused by simultaneous triggering of motor forward and reverse commands.

[0051] The multi-level limit unit provides multi-level safety protection for the device and includes various limit switches: The rising-in-place switch SL1 and the falling-in-place switch SL3 are respectively installed at the high and low set positions of the lifting beam. When the lifting beam reaches the preset high or low position, the corresponding in-place switch will automatically cut off the power supply of the corresponding direction contactor, causing the lifting beam to stop moving and preventing over-lifting.

[0052] The upper limit switch SL2 and the lower limit switch SL4 are set outside the corresponding in-place switches as the final protection barrier. During normal operation, the lifting beam should not touch these limit switches. However, if for some reason the lifting beam exceeds the preset in-place position, the limit switch will be triggered, directly cutting off the main circuit to achieve hard-wired protection and prevent equipment damage or accidents.

[0053] In summary, the electric control system provides a stable power supply through the dual-circuit power supply unit, the motion control unit realizes the convenient control of the lifting operation, the interlock protection unit prevents operation conflicts, and the multi-level limit unit provides multiple safety guarantees. These components together constitute a safe, reliable and easy-to-operate control system, ensuring the efficient operation of the liquid lift pipe replacement device.

[0054] In a possible implementation, the device further includes: a safety fence and a ladder surrounding the periphery of the frame.

[0055] The safety fence surrounds the periphery of the frame and is designed to provide a safe working environment for the operator. It is made of strong metal materials such as steel or aluminum alloy to ensure that it can withstand a certain impact force. The height and strength of the fence are designed to meet relevant safety standards to effectively prevent the operator from accidentally entering the dangerous area during equipment operation. In addition, a safety door may be provided on the fence, equipped with an electronic lock or a mechanical lock, which can only be opened when the equipment stops running and safety conditions are met, further improving the safety of operation.

[0056] The ladder is installed on one or more sides of the frame, providing a safe and convenient up-and-down passage for the operator. The design of the ladder needs to conform to the ergonomic principle to ensure that the operator can maintain stability and comfort during climbing. The spacing between the rungs, the depth of the rungs, and the inclination angle of the ladder all need to be carefully designed to reduce the fatigue and slipping risk during climbing. In addition, handrails are usually provided on both sides of the ladder, and the height and strength of the handrails should be sufficient to support the weight of the operator, providing additional safety guarantees.

[0057] By setting a safety fence and a ladder around the periphery of the frame, the liquid lift pipe replacement device not only improves the safety of operation but also enhances the work convenience of the operator. The safety fence effectively isolates the dangerous area and prevents accidents; the ladder provides a safe and reliable up-and-down passage, facilitating the operator to carry out equipment maintenance and inspection. These design details reflect the overall consideration of the operator's safety and work efficiency.

[0058] In summary, for the technical solution provided in this application, the device can replace the riser pipe without using a transfer cart, avoiding the occupation of the transfer cart, enabling the transfer cart to continue to be used in other production processes, and thus improving the overall production efficiency. It has a high degree of automation, precisely controls the lifting beam through the electric control system, reducing the time and complexity of manual operation. The operator can perform the riser pipe replacement work on the ground without performing complex and dangerous operations on the transfer cart, reducing the safety risks caused by poor operating environments and ensuring the personal safety of the operator. The design of the safety fence and the ladder further enhances the safety of the operation, preventing the operator from accidentally entering the dangerous area and providing a safe up-and-down passage.

[0059] Driving the lifting beam to move in the vertical direction through the lifting transmission mechanism can achieve the rapid separation of the riser pipe assembly and the crucible furnace, simplifying the replacement process of the riser pipe and improving the convenience of the replacement operation. The design of the bidirectional fork and the spring makes the connection and release of the riser pipe assembly more flexible, further simplifying the operation steps. The electric control system precisely controls the operation of the lifting transmission mechanism to ensure the smooth and accurate movement of the lifting beam, thereby ensuring the stable separation and replacement of the riser pipe assembly and enhancing the reliability and stability of the entire replacement process. The multi-level limit unit provides multiple safety guarantees, preventing the lifting beam from lifting excessively and avoiding equipment damage or accidents. The frame structure is reasonably designed, and a cuboid frame formed by welding square hollow steel provides a solid support to ensure the stability and reliability of the equipment during operation. The design of the support seat fixing the hollow steel and the floating support at the top of the lead screw improves the stability and service life of the lead screw.

[0060] This application also provides a method for replacing a riser pipe. Refer to Figure 6 the structural schematic diagram of the docking of a riser pipe replacement device and a transfer cart shown in Figure 7 the state schematic diagram of pushing and pulling the crucible furnace shown in Figure 8 and the top view of a lifting transmission mechanism, a lifting beam, and a crucible furnace furnace plate assembly shown in Step 1: When it is confirmed through the down position switch SL3 of the electric control system that the lifting beam is in the starting position, operate the transfer cart 44 to move the tooling assembly integrated with the riser pipe assembly and the crucible furnace 43 to the docking station of the crucible furnace track 12.

[0061] Step 2: Push the tooling assembly into the interior of the riser pipe replacement device along the crucible furnace track 12, and jointly support the furnace plate 42 of the riser pipe assembly through the bidirectional fork 34 and the fixed fork 33 of the lifting beam.

[0062] Step 3: Trigger the up button S1 of the electric control system to drive the lifting transmission mechanism to lift the lifting beam until the up position switch SL1 is triggered and stops.

[0063] Step 4: Move the crucible furnace 43 out along the crucible furnace track 12.

[0064] Step 5: Trigger the down button S2 of the electric control system to make the lifting beam return to the starting position.

[0065] Step 6: Replace the lifting tube 41 in the lifting tube assembly to obtain the replaced lifting tube assembly.

[0066] Step 7: Trigger the up button S1 of the electric control system to drive the lifting transmission mechanism to lift the lifting beam to drive the replaced lifting tube assembly until the up position switch SL1 is triggered and stops.

[0067] Step 8: Operate the transfer cart 44 to move the crucible furnace 43 to the docking station of the crucible furnace track 12.

[0068] Step 9: Push the crucible furnace 43 into the inside of the lifting tube replacement device along the crucible furnace track 12.

[0069] Step 10: Trigger the down button S2 of the electric control system to make the lifting beam drive the replaced lifting tube assembly to return to the starting position, obtaining the replaced tooling assembly after the combination of the replaced lifting tube assembly and the crucible furnace 43.

[0070] Step 11: Move the replaced tooling assembly out along the crucible furnace track 12 to the die-casting station.

[0071] First, confirm that the lifting beam is in the starting position through the down position switch SL3 of the electric control system to ensure that the equipment is in the initial state. Operate the transfer cart 44 to move the tooling assembly integrated with the lifting tube assembly and the crucible furnace 43 to the docking station of the crucible furnace track 12 to prepare for subsequent operations.

[0072] Push the tooling assembly into the inside of the lifting tube replacement device along the crucible furnace track 12 to ensure that the furnace plate 42 of the lifting tube assembly is accurately placed on the double-directional fork 34 and the fixed fork 33 of the lifting beam to achieve stable support. Trigger the up button S1 of the electric control system to start the lifting transmission mechanism to drive the lifting beam to rise until the up position switch SL1 is triggered and stops to ensure that the lifting tube assembly is lifted to an appropriate height.

[0073] Remove the crucible furnace 43 along the crucible furnace track 12. At this time, the riser tube assembly is separated from the crucible furnace 43, creating space for replacing the riser tube 41. Trigger the down button S2 of the electric control system to slowly lower the lifting beam to the starting position, preparing for the replacement operation of the riser tube 41. When the lifting beam is in the starting position, replace the riser tube 41 in the riser tube assembly to complete the replacement of the key component.

[0074] Trigger the up button S1 of the electric control system again to drive the lifting transmission mechanism to lift the lifting beam, and lift the replaced riser tube assembly to the position where the up limit switch SL1 is triggered and stops, ensuring that the assembly is at the correct height. Operate the transfer cart 44 to move the crucible furnace 43 back to the docking station on the crucible furnace track 12, preparing to recombine with the replaced riser tube assembly. Push the crucible furnace 43 along the crucible furnace track 12 into the interior of the riser tube replacement device to ensure accurate docking of the crucible furnace 43 with the replaced riser tube assembly.

[0075] Trigger the down button S2 of the electric control system to make the lifting beam drive the replaced riser tube assembly to descend to the starting position, forming a complete tooling assembly with the crucible furnace 43. Finally, move the replaced tooling assembly out of the riser tube replacement device along the crucible furnace track 12 and transfer it to the die-casting station for subsequent production operations.

[0076] Those skilled in the art can understand that Figures 1 - 8 the structures shown in [reference] do not constitute a limitation on the structure of the present application, and may include more or fewer components than shown in the figure, or combine certain components, or adopt different component arrangements.

[0077] It should be understood that "a plurality of" mentioned herein refers to two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0078] The above are only exemplary embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present application shall be included within the protection scope of the present application.

Claims

1. A riser pipe replacement device, characterized in that The device includes: a frame, a lifting transmission mechanism, a lifting beam, and an electric control structure, characterized in that: The frame is used to support the lifting transmission mechanism, the lifting beam, and the electric control structure; The lifting transmission mechanism is connected to the frame and is used to drive the lifting beam to move in the vertical direction; The lifting beam is connected to the lifting transmission mechanism and is used to carry the liquid lifting pipe assembly to drive the separation of the liquid lifting pipe assembly and the crucible furnace; The electric control system is used to control the operation of the lifting transmission mechanism.

2. The lift pipe replacement device according to claim 1, characterized in that The frame includes a main frame, a crucible furnace track, a commutator fixing angle steel, a lifter fixing hollow steel, a guide rail fixing hollow steel, and a support seat fixing hollow steel; The main frame is a rectangular parallelepiped frame formed by welding square hollow steels. Fixed holes are provided in the bottom hollow steel of the frame, and the fixed holes are used to penetrate embedded bolts to fix the above frame on the ground; The crucible furnace track is a continuous guiding structure formed by welding hollow steel and channel steel. The crucible furnace track is horizontally arranged inside the main frame, and one end of the crucible furnace track protrudes for docking with the transfer vehicle track; The commutator fixing angle steel is horizontally welded to the lower part of one side of the main frame, and the threaded holes on the commutator fixing angle steel are used to fix the speed change and commutation transmission box and the commutation transmission box of the lifting transmission mechanism; The lifter fixing hollow steel is horizontally welded between two adjacent hollow steels in the longitudinal direction of the main frame. The fixed bottom plate with threaded holes of the lifter fixing hollow steel is used to install the turbine screw lifter of the lifting transmission mechanism; The guide rail fixing hollow steel is vertically fixed on the lifter fixing hollow steel, and the threaded holes on the guide rail fixing hollow steel are used to install the linear guide rail of the lifting transmission mechanism; The support seat fixing hollow steel is horizontally fixed on the top of the guide rail fixing hollow steel, and the threaded holes of the support seat fixing hollow steel are used to fix the support seat to form a floating support at the top of the screw; 3. The riser replacement device according to claim 2, wherein, The lifting transmission mechanism includes: a motor, the speed change and commutation transmission box, the commutation transmission box, a coupling, a connecting shaft, a turbine screw lifter, the linear guide rail, a slider, and the support seat; The motor is directly connected to the speed change and commutation transmission box through the coupling and is used to receive an electric control signal to start power output; The speed change and commutation transmission box drives the two commutation transmission boxes through the connecting shaft and is used to convert single-axis input into double-axis synchronous output; The output shafts at both ends of the commutation transmission box are respectively connected to the turbine screw lifters on both sides through couplings and are used to realize symmetric drive of the lifting motion; The screw of the turbine screw lifter forms a screw drive with the nut of the lifting beam and is used to convert rotational motion into linear lifting; The linear guide rail is connected to the side of the lifting beam through the slider and is used to restrict the lifting beam to move only in the vertical direction; The support seat is used to support the top of the screw.

4. The riser replacement device according to claim 3, characterized in that, The lifting beam includes: a beam body, a nut embedding sleeve, a fixed fork, a two-way fork, a large pin, a spring, a screw, and a small pin; The beam body is a structure made of hollow steel, and the beam body includes a large central circular hole, symmetric square holes, alignment circular holes, end grooves, a large perforated ear plate and a small perforated ear plate located at the same end of the end grooves. The large central circular hole is used to insert the nut embedding sleeve, and the threaded holes evenly distributed around the large central circular hole are used to fix the nut with bolts. The symmetric square holes and the alignment circular holes are used to pass through bolts to fix the slider; the end grooves are used to install the large pin, and the large perforated ear plate is used to install the small pin; One end of the nut embedding sleeve is flush with the beam body, and the other end protrudes, which is used to transmit the spiral driving force to drive the lifting beam to move; The fixed fork is fixed at one end of the beam body opposite to the end groove, and is used to provide a fixed-end reference; The two-way fork includes a large arc end, a small arc end, a countersunk hole located at the small arc end, and a circular hole near the small arc end; the large arc end is used to contact the liquid-rising pipe assembly; the circular hole is used to penetrate the small pin to connect the large perforated ear plate to form a rotation fulcrum; the countersunk hole is used to connect one end of the spring through the screw; the top surfaces of the two-way fork and the fixed fork are on the same horizontal plane, and the horizontal plane is lower than the bottom surface of the furnace plate in the liquid-rising pipe assembly; The other end of the spring is fixed on the small perforated ear plate through the large pin, and is used to provide a reset elastic force.

5. The riser replacement device according to claim 4, characterized in that, The electric control system includes: A double-circuit power supply unit, which is composed of a motor power switch and a control power switch, and is respectively connected to the power circuit and the control circuit through independent circuit breakers; A motion control unit, which includes an up button and a down button. The normally open contact of the up button is connected in series with the up contactor, and the normally open contact of the down button is connected in series with the down contactor coil, and is used to manually trigger the vertical movement of the lifting beam; An interlock protection unit, in which the auxiliary normally closed contacts of the up contactor and the down contactor are cross-connected in each other's control circuits to prevent the forward and reverse rotation instructions from being triggered simultaneously; A multi-stage limit unit, which includes: The up-to-position switch and the down-to-position switch are respectively installed at the high and low set positions of the lifting beam, and are used to automatically cut off the power supply of the corresponding direction contactor; The up limit switch and the down limit switch are arranged outside the corresponding in-position switch, and are used to directly cut off the main circuit to achieve hard-wired protection.

6. The riser replacement device according to any one of claims 1-5, characterized in that, The device further includes a safety fence and a ladder surrounding the periphery of the frame.

7. A method for replacing a riser pipe based on the device according to any one of claims 5 or 6, characterized in that, The method includes: When it is confirmed by the down-to-position switch of the electric control system that the lifting beam is in the starting position, operate the transfer vehicle to move the tooling assembly integrated with the liquid-rising pipe assembly and the crucible furnace to the crucible furnace track docking station; Push the tooling assembly into the liquid-rising pipe replacement device along the crucible furnace track, and jointly support the furnace plate of the liquid-rising pipe assembly through the two-way fork and the fixed fork of the lifting beam; Trigger the up button of the electric control system to drive the lifting transmission mechanism to lift the lifting beam until the up-to-position switch is triggered and stops; Move the crucible furnace out along the crucible furnace track; Trigger the down button of the electric control system to make the lifting beam return to the starting position; Replace the lift pipe in the lift pipe assembly to obtain the replaced lift pipe assembly; Trigger the up button of the electric control system to drive the lifting transmission mechanism to lift the lifting beam and drive the replaced lift pipe assembly to stop when the up-in-place switch is triggered; Operate the transfer cart to move the crucible furnace to the crucible furnace track docking station; Push the crucible furnace into the lift pipe replacement device along the crucible furnace track; Trigger the down button of the electric control system to make the lifting beam drive the replaced lift pipe assembly to return to the starting position, obtaining the replaced tooling assembly after the combination of the replaced lift pipe assembly and the crucible furnace; Move the replaced tooling assembly out of the crucible furnace track to the die-casting station.

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