Horizontal heavy centrifugal machine for magnetic suspension centrifugal casting and application

Abstract

The invention relates to the technical field of casting, in particular to a horizontal heavy centrifugal machine for magnetic suspension centrifugal casting and application. Comprising a base, a catch wheel mechanism and a riding wheel mechanism, the four groups of riding wheel mechanisms are fixedly arranged on the base and are used for supporting the cold mold, and the two sides of each riding wheel mechanism are respectively provided with one catch wheel mechanism for preventing the cold mold from axially moving; the riding wheel mechanism comprises a rotor magnetic pivot fixed on the base through a bearing and a riding wheel outer wheel arranged on the outer side of the rotor magnetic pivot, and a driving motor used for driving the rotor magnetic pivot is fixed on the base; the catch wheel mechanism comprises a cylindrical catch wheel and a tapered roller bearing arranged in the center of the catch wheel, the tapered roller bearing is installed on a vertical catch wheel shaft, the catch wheel shaft is fixed to an adjusting support, and the adjusting support is fixed to the base. Through the design, magnetic force repulsion is generated between the rotor magnetic pivot and the riding wheel outer wheel, so that the riding wheel outer wheel achieves the magnetic suspension effect, the catch wheel mechanism lifts the catch wheel outer wheel by 6-10 mm through high-pressure oil, a hydrostatic pressure bearing is formed, and the oil film damping effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of casting, in particular to a horizontal heavy centrifuge for magnetic levitation centrifugal casting and applications thereof. Background Art

[0002] Centrifugal casting is a casting method in which liquid metal is poured into a rotating cold mold cavity, where it fills and solidifies under the action of centrifugal force. Its core principle is that molten metal is poured into a high-speed rotating cold mold (mold). Under the action of centrifugal force, the molten metal is thrown toward the inner wall of the cold mold, filling the mold cavity and solidifying, ultimately producing a hollow cylindrical, tubular, or other axisymmetric casting.

[0003] Based on the rotation method of the cold mold, there are two main types of centrifugal casting: vertical centrifugal casting (rotating around a vertical axis) and horizontal centrifugal casting (rotating around a horizontal axis). Horizontal centrifugal casting, in which the cold mold rotates around a horizontal axis, distributes the centrifugal force evenly along the entire circumference (under ideal conditions). This is the most widely used centrifugal casting method. It is primarily used to produce tubular and cylindrical castings whose length is greater than their diameter (such as water pipes, gas pipes, cylinder liners, and bimetallic composite centrifugal roller tube blanks).

[0004] Horizontal centrifugal casting is usually completed on a horizontal centrifuge. Liquid metal with a high alloy content is poured into a high-speed rotating horizontal centrifugal cold mold through a special pouring chute. During the high-speed rotation, the centrifuge will inevitably vibrate due to the rotation of the bearings and the resonance of the equipment components at the same frequency, as well as the instability of the high-speed rotation balance. Centrifuge vibration poses a great threat to the quality of casting products and the life of the equipment: A. It induces and aggravates the segregation of alloying elements, causing the carbide-forming elements (Cr, Mo, Nb, V) to be enriched at the outer crystallization front, resulting in uneven casting performance and affecting the casting quality. B. It causes early fatigue failure of the equipment, causing abnormal wear of bearings, support frames, etc. Eliminating vibration during high-speed centrifugation has always been a problem in centrifugal casting.

[0005] The patent of this invention is an innovation based on the horizontal centrifuge. By modifying the supporting wheel and the retaining wheel, it realizes precise control of the centrifugal casting during high-speed rotation, solves the bottleneck that the centrifuge cannot further increase the speed during high-speed rotation, suppresses and eliminates the problem of same-frequency resonance generated during high-speed centrifugation, realizes automatic adjustment of axial horizontal dynamic balance, improves the quality of centrifugal castings, and enhances the safety of equipment during the centrifugal process. Summary of the Invention

[0006] The main purpose of the present invention is to provide a horizontal heavy centrifuge for magnetic levitation centrifugal casting and its application, so as to effectively solve the problems raised in the background technology.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a horizontal heavy-duty centrifuge for magnetic levitation centrifugal casting, comprising a base, a stopper mechanism, and a supporting roller mechanism; the supporting roller mechanism has four groups, which are fixedly arranged on the base and used to support the cold mold, and a stopper mechanism is arranged on each side of the supporting roller mechanism to prevent axial movement of the cold mold; the supporting roller mechanism includes a rotor armature fixed to the base with a bearing, an outer supporting roller wheel arranged on the outside of the rotor armature, and a driving motor for driving the rotor armature fixed on the base; the stopper mechanism includes a cylindrical stopper, a tapered roller bearing arranged in the center of the stopper, the tapered roller bearing is installed on a vertical stopper shaft, the stopper shaft is fixed on an adjustment bracket, and the adjustment bracket is fixed on the upper side of the base.

[0008] Preferably, the outer wheel of the supporting wheel is an annular wheel with a rectangular cross-section, and eight notch-shaped grooves are evenly distributed on the surface of the inner hole. Two circular spring columns are provided at both ends of the grooves, and a spring assembly with a similar shape to the notch is installed in the notch-shaped groove. The spring assembly includes a spring bracket, and a spring is sheathed on the outside of the circular spring column, and is inserted into two spring holes which are blind holes at corresponding positions on the spring bracket. A notch pit is provided on the side surface of the spring bracket facing the center as a magnet slot, and a magnet assembly is installed in the magnet slot, and the magnet assembly includes three fan-shaped magnets I with 30-degree sharp angles in the semicircular parts at both ends, and three rectangular strip-shaped magnets II in the middle.

[0009] Preferably, the magnets I and II are samarium cobalt (SmCo) magnets (characteristic parameters: high temperature resistance of 250-550° C., magnetic strength reaching 10,000 gauss).

[0010] Preferably, the rotor armature has rotor shafts at both ends and a cylindrical middle portion. The outer surface is provided with eight evenly distributed radial keyways. An inverted conical frame is clamped in each keyway. The outer side surface of the conical frame is lower than the outer diameter surface of the radial keyway. An electromagnetic coil is wound on the conical frame. One end of the rotor armature is connected to the drive motor, and the other end is connected to the magnetic suspension circuit bridge balance system by wires. The spring bracket in the spring assembly on the outer wheels of the eight supporting wheels is clamped in the radial keyway above the eight conical frames.

[0011] Preferably, when the rotor armature is in a non-conductive state, the spring bracket is 12.5-15 mm higher than the inner surface of the outer wheel of the supporting wheel, and is clamped in a groove provided on the surface of the rotor armature, playing the role of a spline, transmitting the torque of the rotor armature to the outer wheel of the supporting wheel, thereby realizing cold-type centrifugal rotation under low-speed conditions;

[0012] When the electromagnetic coil on the rotor armature is energized, it enters a high-speed centrifugal rotation state. The conductive coil of the rotor armature and the magnet assembly generate a mutually repulsive magnetic field, compressing the spring bracket away from the axis. The compression stroke is 10 to 20 mm, and a suspended air gap of about 10 mm is generated between the outer wheel of the supporting wheel and the rotor armature.

[0013] Preferably, the magnetic suspension circuit bridge balance system includes four resistors R5, R6, R7, and R8 connected end to end to form a balance bridge similar to a rectifier circuit, R5 and R6 are located on one side, R7 and R8 are located on the other side, and an indicator meter is connected between the connection point A of R5 and R6 and the connection point B of R7 and R8 for measuring the current deviation value; a wire is drawn between point A and the indicator meter to connect a variable resistor R 变， Resistor R 变 Connect the balance bridge point B, resistor R 变 In parallel with the resistor R1, one end of the resistor R1 is connected to the connection point of R4 and R8, and the other end is connected to an overcurrent protector and a freewheeling diode. The freewheeling diode is connected to a constant current power supply. The other outlet of the constant current power supply is connected to a Hall current sensor. The Hall current sensor is connected to the four electromagnetic coils in the rotor armature 24. The electromagnetic coils are connected to the variable resistor R 变 Mobile end; the other side of the balance bridge is connected to the remaining four electromagnetic coils in the same way.

[0014] Preferably, the stopper wheel of the stopper wheel mechanism is provided with a sealed oil inlet chamber cover on the upper side of the tapered roller bearing, an oil inlet chamber is formed between the tapered roller bearing and the oil inlet chamber cover, an oil return chamber is provided between the lower end of the stopper wheel shaft and the adjustment bracket, an oil inlet hole is provided in the center of the stopper wheel shaft to connect the oil inlet chamber, the oil inlet hole is externally connected to the oil inlet pipeline, the oil inlet pipeline is connected to the oil outlet of the oil pump, two oil return holes are provided on both sides of the oil inlet hole of the stopper wheel shaft, the oil return holes are connected to the oil inlet chamber and the oil return chamber respectively, the oil return chamber is connected to the hydraulic oil tank by the return oil pipeline, a hydraulic transmitter is provided in the middle of the return oil pipeline, and an overflow valve is provided on the pipeline between the hydraulic transmitter and the oil pump;

[0015] A lower cover is fixed at the lower end of the stopper wheel, and an oil return seal is installed on the stopper wheel shaft on the upper side of the lower cover. The stopper wheel, with the lower cover and the oil return seal, has a certain amount of floating up and down.

[0016] Preferably, the wheel block mechanism is also provided with a hydraulic balance adjustment system, and the two wheel block mechanisms maintain the pressure in the oil inlet pipeline through two overflow valves, and use two hydraulic transmitters to measure the pressure difference in the oil inlet pipeline, and feed it back to the oil pump for adjustment to maintain pressure balance.

[0017] Related calculation methods:

[0018] 1. Centrifugal casting generally uses gravity multiple G to express the strength of centrifugal force. The choice of gravity multiple directly affects the filling capacity of molten metal, the density of the casting and the distribution of the metallographic structure inside the casting. The calculation formula of gravity multiple is:

[0019] G=ω 2 R / g

[0020] Where: ω: angular velocity (rad / s)

[0021] R: Centrifugal radius (the distance from the center of gravity of the casting to the axis of rotation, unit: cm)

[0022] g: acceleration due to gravity (9.8 m / s 2 )

[0023] After the gravity constant G is determined, in production practice, the cold centrifuge speed (n, rpm) is determined by G and calculated as follows:

[0024] n=299·√(G / R)

[0025] Where: n: centrifugal speed (rpm)

[0026] The speed of the cooling mold determines whether the gravity constant can be achieved. The speed power mainly comes from the drive motor and is also limited by rotating components such as the centrifuge roller rotating bearing. Increasing the speed of the centrifugal cooling mold can effectively increase the gravity constant, thereby improving the quality of centrifugal casting products.

[0027] 2. The rotor shaft is made of 40CrNiMoA forgings and is subjected to tempering heat treatment as a whole, with a hardness of 28-32HRC; the spline outer teeth are surface quenched, with a hardness of 45-50HRC.

[0028] There are 8 sets of electromagnetic coils on the rotor shaft, which are made of oriented silicon steel (30Q120). 2 A single bare copper wire (4.52mm diameter) is wound, with the incoming and outgoing wires connected to the busbars on the mandrel end faces. The maximum current allowed for a single-strand conductor is 80-100A, and the winding is 6 turns. The resulting magnetic induction intensity is calculated as follows:

[0029] B=μ·n·I / L

[0030] Where: B: magnetic induction intensity (T)

[0031] μ: Oriented silicon steel 120±5% H / m

[0032] n: number of turns

[0033] I: is the current intensity, A

[0034] L: coil length, m

[0035] 3. The power supply uses a digitally controlled constant current power supply with a power of approximately 80A / 150V. Each set of coils is wound with insulated copper wire according to the right-hand rule. The direction of the magnetic force of the iron core is determined so that the magnetic field generated by the electromagnetic force and the magnet assembly NS on the outer wheel are of the same polarity and repel each other.

[0036] The magnetic induction intensity generated by each set of electromagnetic coils is about 1.6×10 5T. According to the electromagnetic force formula, calculate the electromagnetic force generated by the rotor armature.

[0037]

[0038] Where: B g : Air gap magnetic induction intensity (T)

[0039] A g : air gap cross-sectional area, m 2

[0040] μ0: 4π×10 -7 H / m

[0041] Beneficial effects of the invention: The patent of the present invention is an innovation based on the horizontal centrifuge. By modifying the supporting wheel and the retaining wheel, precise control of the centrifugal casting during high-speed rotation is achieved, solving the bottleneck that the centrifuge cannot further increase the speed during high-speed rotation, suppressing and eliminating the same-frequency resonance problem generated during high-speed centrifugation, realizing automatic adjustment of axial horizontal dynamic balance, improving the quality of centrifugal castings, and improving the safety of the equipment during the centrifugal process. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Attachment Figure 1 It is a structural schematic diagram of the present invention.

[0043] Attachment Figure 2 For attachment Figure 1 Side view.

[0044] Attachment Figure 3 Schematic diagram of the circuit bridge balancing system of the magnetic levitation of the present invention.

[0045] Attachment Figure 4 It is a structural schematic diagram of the hydraulic balance adjustment system of the present invention.

[0046] Attachment Figure 5 It is an assembly drawing of the supporting wheel mechanism of the present invention.

[0047] Attachment Figure 6 This is a schematic diagram of the internal working structure of the supporting wheel mechanism of the present invention when no power is supplied.

[0048] Attachment Figure 7 This is a schematic diagram of the internal working structure of the supporting wheel mechanism of the present invention when it is energized.

[0049] Attachment Figure 8 This is a schematic diagram of the overall assembly structure of the outer wheel of the supporting wheel of the present invention.

[0050] Attachment Figure 9 This is a schematic diagram of the rotor armature assembly structure of the present invention.

[0051] Attachment Figure 10 This is a schematic diagram of the structure of the rotor armature electromagnetic coil of the present invention.

[0052] Attachment Figure 11 This is a schematic diagram of the structure of the outer wheel parts of the supporting wheel of the present invention.

[0053] Attachment Figure 12 This is a schematic diagram of the rotor shaft structure of the present invention.

[0054] Attachment Figure 13 Schematic diagram of the three-dimensional structure of the spring bracket of the present invention Figure 1 .

[0055] Attachment Figure 14 Schematic diagram of the three-dimensional structure of the spring bracket of the present invention Figure 2 .

[0056] Attachment Figure 15 It is a schematic diagram of the structure of the magnet I part of the present invention.

[0057] Attachment Figure 16 This is a schematic diagram of the structure of the magnet II component of the present invention.

[0058] Attachment Figure 1 —16, base 1, adjustment bracket 2, stopper wheel mechanism 3, cold type 4, drive motor 5, supporting wheel mechanism 6, magnetic suspension circuit bridge balancing system includes 7, hydraulic oil tank 8, oil pump 9, overflow valve 9-1, hydraulic transmitter 10, return oil chamber 11, oil inlet hole 12, return oil hole 13, tapered roller bearing 14, oil inlet chamber 15, oil inlet pipeline 16, return oil pipeline 16-1, stopper wheel shaft 17, stopper wheel 18, oil inlet chamber cover 19, lower cover 19-1, return oil sealing ring 19-2, spring assembly 20, magnet slot 21-1, spring hole 21-2, spring bracket 21, spring 22, supporting wheel outer wheel 23, rotor armature 24, electromagnetic coil 25, conical frame 26, rotor shaft 27, magnet I28, magnet assembly 29, magnet II30, spring column 31. DETAILED DESCRIPTION

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0060] Attachment Figure 1As shown in FIG16 , a horizontal heavy-duty centrifuge for magnetic levitation centrifugal casting comprises a base 1, a wheel stop mechanism 3, and a supporting wheel mechanism 6; the supporting wheel mechanism comprises four groups, which are fixedly arranged on the base 1 and used to support the cold mold 4, and a wheel stop mechanism 3 is arranged on each side of the supporting wheel mechanism to prevent the cold mold from axial movement; the supporting wheel mechanism 6 comprises a rotor armature 24 fixed to the base 1 with a bearing, a supporting wheel outer wheel 23 arranged on the outside of the rotor armature 24, and a driving motor 5 for driving the rotor armature 24 fixed on the base 1; the wheel stop mechanism comprises a cylindrical wheel stop 18, a tapered roller bearing 14 arranged at the center of the wheel stop 18, the tapered roller bearing 14 is mounted on a vertical wheel stop shaft 17, the wheel stop shaft 17 is fixed on the adjustment bracket 2, and the adjustment bracket 2 is fixed on the upper side of the base 1.

[0061] Preferably, the outer wheel 23 of the supporting wheel is an annular wheel with a rectangular cross-section. Eight notch-shaped grooves are evenly distributed on the surface of the inner hole. Two circular spring columns 31 are provided at both ends of the grooves. A spring assembly 20 with a similar shape to the notch is installed in the notch-shaped groove. The spring assembly 20 includes a spring bracket 21. A spring 22 is sheathed on the outside of the circular spring column 31 and inserted into two blind spring holes 21-2 at corresponding positions on the spring bracket 21. A notch pit is provided on the side surface facing the center as a magnet slot 21-1. A magnet assembly 29 is installed in the magnet slot 21-1. The magnet assembly 29 includes three fan-shaped magnets I28 with 30-degree sharp angles in the semicircular parts at both ends and three rectangular strip-shaped magnets II30 in the middle.

[0062] Preferably, the magnet I28 and the magnet II30 are samarium cobalt (SmCo) magnets (characteristic parameters: high temperature resistance of 250-550° C., magnetic strength reaching 10,000 gauss).

[0063] Preferably, the rotor armature 24 has rotor shafts 27 at both ends and a cylindrical middle portion. The outer surface is provided with eight evenly distributed radial keyways. An inverted conical frame 26 is clamped in each keyway. The outer side surface of the conical frame 26 is lower than the outer diameter surface of the radial keyway. An electromagnetic coil 25 is wound on the conical frame 26. One end of the rotor armature 24 is connected to the drive motor 5, and the other end is connected to the magnetic suspension circuit bridge balance system by an electric wire. The spring bracket 21 in the spring assembly 20 on the outer wheels of the eight supporting wheels is clamped in the radial keyway above the eight conical frames.

[0064] Preferably, when the rotor armature 24 is in a non-conductive state, the spring bracket 21 is 12.5-15 mm higher than the inner surface of the supporting wheel outer wheel 23 and is clamped in a groove provided on the surface of the rotor armature 24, playing a spline role, transmitting the torque of the rotor armature to the supporting wheel outer wheel 23, thereby realizing cold-type centrifugal rotation under low-speed conditions;

[0065] When the electromagnetic coil 25 on the rotor armature 24 is energized, it enters a high-speed centrifugal rotation state, and the conductive coil of the rotor armature 24 and the magnet assembly 29 generate a mutually repulsive magnetic field, compressing the spring bracket 21 away from the axis, with a compression stroke of 10 to 20 mm, and generating a suspended air gap of about 10 mm between the outer wheel 23 and the rotor armature 24.

[0066] Preferably, the magnetic suspension circuit bridge balance system 7 includes four resistors R5, R6, R7, and R8 connected end to end to form a balance bridge similar to a rectifier circuit, R5 and R6 are located on one side, R7 and R8 are located on the other side, and an indicator meter is connected between the connection point A of R5 and R6 and the connection point B of R7 and R8 for measuring the current deviation value; a wire is drawn between point A and the indicator meter to connect a variable resistor R 变， Resistor R 变 Connect the balance bridge point B, resistor R 变 In parallel with the resistor R1, one end of the resistor R1 is connected to the connection point of R4 and R8, and the other end is connected to an overcurrent protector and a freewheeling diode. The freewheeling diode is connected to a constant current power supply. The other outlet of the constant current power supply is connected to a Hall current sensor. The Hall current sensor is connected to the four electromagnetic coils 25 in the rotor armature 24. The electromagnetic coils 25 are connected to the variable resistor R 变 Mobile end: The other side of the balance bridge is connected to the remaining four electromagnetic coils 25 in the same way.

[0067] Preferably, the stopper 18 of the stopper mechanism is provided with a sealed oil inlet chamber cover 19 on the upper side of the tapered roller bearing 14, an oil inlet chamber 15 is formed between the tapered roller bearing 14 and the oil inlet chamber cover 19, an oil return chamber 11 is provided between the lower end of the stopper shaft 17 and the adjustment bracket 2, an oil inlet hole 12 is provided in the center of the stopper shaft 17 to communicate with the oil inlet chamber 15, the oil inlet hole 12 is externally connected to the oil inlet pipeline 16, the oil inlet pipeline 16 is connected to the oil outlet of the oil pump 9, two oil return holes 13 are provided on both sides of the oil inlet hole 12 of the stopper shaft 17, the oil return holes 13 are respectively connected to the oil inlet chamber 15 and the oil return chamber 11, the oil return chamber 11 is connected to the hydraulic oil tank 8 with a return oil pipeline 16-1, a hydraulic transmitter 10 is provided in the middle of the return oil pipeline 16-1, and an overflow valve 9-1 is provided on the pipeline between the hydraulic transmitter 10 and the oil pump 9;

[0068] A lower cover 19-1 is fixed to the lower end of the stopper wheel 18, and an oil return seal ring 19-2 is installed on the stopper wheel shaft 17 on the upper side of the lower cover 19-1. The stopper wheel 18 has a certain amount of floating up and down with the lower cover 19-1 and the oil return seal ring 19-2.

[0069] Preferably, the wheel-blocking mechanism is also provided with a hydraulic balance adjustment system. The two wheel-blocking mechanisms maintain the pressure in the oil inlet line 16 through two overflow valves 9-1, and use two hydraulic transmitters 10 to measure the pressure difference in the oil inlet line 16, and feed it back to the oil pump for adjustment to maintain pressure balance.

[0070] When in use, it starts at a low-speed stage. When the rotor armature 24 is in a non-conductive state, the spring bracket 21 is 12.5-15 mm higher than the inner surface of the supporting wheel outer wheel 23 and is clamped in the groove provided on the surface of the rotor armature 24, playing the role of a spline, transmitting the torque of the rotor armature to the supporting wheel outer wheel 23, thereby realizing cold-type centrifugal rotation under low-speed conditions.

[0071] When the electromagnetic coil 25 on the rotor armature 24 is energized, it enters a high-speed centrifugal rotation state. The conductive coil of the rotor armature 24 and the magnet assembly 29 generate a mutually repelling magnetic field, compressing the spring bracket 21 away from the axis. The compression stroke is 10 to 20 mm, and a suspension air gap of about 10 mm is generated between the supporting wheel outer wheel 23 and the rotor armature 24. At the same time, the supporting wheel outer wheel 23 lifts and rotates the cold mold 4, achieving high-speed rotation of the cold mold 4 in the magnetic suspension state.

[0072] When entering the high-speed centrifugal state, the stopper mechanism starts to supply high-pressure oil, generating a lifting force through the high-pressure hydraulic oil, and the stopper 18 is lifted by 6-10mm, forming a liquid static pressure bearing, which plays the role of oil film damping and left and right horizontal adjustment.

[0073] Beneficial effects of the invention: The patent of the present invention is an innovation based on the horizontal centrifuge. By modifying the supporting wheel and the retaining wheel, precise control of the centrifugal casting during high-speed rotation is achieved, solving the bottleneck that the centrifuge cannot further increase the speed during high-speed rotation, suppressing and eliminating the same-frequency resonance problem generated during high-speed centrifugation, realizing automatic adjustment of axial horizontal dynamic balance, improving the quality of centrifugal castings, and improving the safety of the equipment during the centrifugal process.

[0074] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A horizontal heavy centrifuge for magnetic levitation centrifugal casting, characterized by: It includes a base, a stop wheel mechanism, and a supporting wheel mechanism; there are four groups of supporting wheel mechanisms, which are fixed on the base and used to support the cold mold. A stop wheel mechanism is set on each side of the supporting wheel mechanism to prevent axial movement of the cold mold; the supporting wheel mechanism includes a rotor armature fixed to the base with a bearing, a supporting wheel outer wheel set on the outside of the rotor armature, and a driving motor for driving the rotor armature fixed on the base; the stop wheel mechanism includes a cylindrical stop wheel, a tapered roller bearing set in the center of the stop wheel, the tapered roller bearing is installed on the vertical stop wheel shaft, the stop wheel shaft is fixed on the adjustment bracket, and the adjustment bracket is fixed on the upper side of the base.

2. A horizontal heavy centrifuge for magnetic levitation centrifugal casting according to claim 1, characterized in that: The outer wheel of the supporting wheel is an annular wheel with a rectangular cross-section. Eight notch-shaped grooves are evenly distributed on the surface of the inner hole. Two circular spring columns are provided at both ends of the grooves. A spring assembly with a similar shape to the notch is installed in the notch-shaped groove. The spring assembly includes a spring bracket. A spring is sleeved on the outside of the circular spring column and inserted into two spring holes which are blind holes at corresponding positions on the spring bracket. A notch pit is provided on the side of the spring bracket facing the center as a magnet slot. A magnet assembly is installed in the magnet slot. The magnet assembly includes three fan-shaped magnets I with 30-degree sharp angles in the semicircular parts at both ends and three rectangular strip-shaped magnets II in the middle.

3. The horizontal heavy centrifuge for magnetic levitation centrifugal casting according to claim 1, characterized in that: The magnets I and II are samarium cobalt (SmCo) magnets (characteristic parameters: high temperature resistance of 250-550° C., magnetic strength reaching 10,000 gauss).

4. The horizontal heavy centrifuge for magnetic levitation centrifugal casting according to claim 1, characterized in that: The rotor armature has rotor shafts at both ends and a cylindrical middle. The outer surface is provided with eight evenly distributed radial keyways. An inverted conical frame is clamped in each keyway. The outer side surface of the conical frame is lower than the outer diameter surface of the radial keyway. An electromagnetic coil is wound on the conical frame. One end of the rotor armature is connected to the drive motor, and the other end is connected to the magnetic suspension circuit bridge balance system by wires. The spring bracket in the spring assembly on the outer wheels of the eight supporting wheels is clamped in the radial keyway above the eight conical frames.

5. The horizontal heavy centrifuge for magnetic levitation centrifugal casting according to claim 1, characterized in that: When the rotor armature is in a non-conductive state, the spring bracket is 12.5-15mm higher than the inner surface of the outer wheel of the supporting wheel, and is clamped in the groove set on the surface of the rotor armature, playing the role of a spline, transmitting the torque of the rotor armature to the outer wheel of the supporting wheel, realizing cold rotation centrifugation under low-speed conditions; When the electromagnetic coil on the rotor armature is energized, it enters a high-speed centrifugal rotation state. The conductive coil of the rotor armature and the magnet assembly generate a mutually repulsive magnetic field, compressing the spring bracket away from the axis. The compression stroke is 10 to 20 mm, and a suspended air gap of about 10 mm is generated between the outer wheel of the supporting wheel and the rotor armature.

6. The horizontal heavy centrifuge for magnetic levitation centrifugal casting according to claim 1, characterized in that: The magnetic suspension circuit bridge balance system includes four resistors R5, R6, R7, and R8 connected end to end to form a balance bridge similar to a rectifier circuit. R5 and R6 are located on one side, and R7 and R8 are located on the other side. An indicator meter is connected between the connection point A of R5 and R6 and the connection point B of R7 and R8 to measure the current deviation value; a wire is drawn between point A and the indicator meter to connect a variable resistor R 变， Resistor R 变 Connect the balance bridge point B, resistor R 变 In parallel with the resistor R1, one end of the resistor R1 is connected to the connection point of R4 and R8, and the other end is connected to an overcurrent protector and a freewheeling diode. The freewheeling diode is connected to a constant current power supply. The other outlet of the constant current power supply is connected to a Hall current sensor. The Hall current sensor is connected to the four electromagnetic coils in the rotor armature 24. The electromagnetic coils are connected to the variable resistor R 变 Mobile end; the other side of the balance bridge is connected to the remaining four electromagnetic coils in the same way.

7. The horizontal heavy centrifuge for magnetic levitation centrifugal casting according to claim 1, characterized in that: The stopper wheel of the stopper wheel mechanism is provided with a sealed oil inlet chamber cover on the upper side of the tapered roller bearing, an oil inlet chamber is formed between the tapered roller bearing and the oil inlet chamber cover, an oil return chamber is provided between the lower end of the stopper wheel shaft and the adjustment bracket, an oil inlet hole is provided in the center of the stopper wheel shaft to connect to the oil inlet chamber, the oil inlet hole is externally connected to the oil inlet pipeline, the oil inlet pipeline is connected to the oil outlet of the oil pump, two oil return holes are provided on both sides of the oil inlet hole of the stopper wheel shaft, the oil return holes are connected to the oil inlet chamber and the oil return chamber respectively, the oil return chamber is connected to the hydraulic oil tank by the return oil pipeline, a hydraulic transmitter is provided in the middle of the return oil pipeline, and an overflow valve is provided on the pipeline between the hydraulic transmitter and the oil pump; A lower cover is fixed at the lower end of the stopper wheel, and an oil return seal is installed on the stopper wheel shaft on the upper side of the lower cover. The stopper wheel, with the lower cover and the oil return seal, has a certain amount of floating up and down.

8. The horizontal heavy centrifuge for magnetic levitation centrifugal casting according to claim 1, characterized in that: The wheel block mechanism is also provided with a hydraulic balance adjustment system. The two wheel block mechanisms maintain the pressure in the oil inlet pipeline through two overflow valves. Two hydraulic transmitters are used to measure the pressure difference in the oil inlet pipeline and feed it back to the oil pump for adjustment to maintain pressure balance.

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