A lift and stir structure

Abstract

This utility model relates to the field of stirring and lifting structures, and specifically to a stirring and lifting structure comprising: a furnace cover; a magnetic fluid pressure blocking device and a rotating magnetic fluid, both disposed above the furnace cover, the rotating magnetic fluid being close to the inner side of the furnace cover and connected to a lead screw to seal the rotation gap of the lead screw; the magnetic fluid pressure blocking device being located below the rotating magnetic fluid to isolate the high pressure inside the furnace from the magnetic fluid sealing area; a lead screw and a copper nut, the lead screw penetrating the furnace cover and linked with the rotating magnetic fluid, the copper nut cooperating with the lead screw and limited by a guide gas pipe, moving only along the axial direction of the lead screw; a gear transmission system including a first gear, a second gear, and a servo motor, the second gear being driven by the servo motor through a planetary reducer and driving the first gear and the lead screw to rotate; and a stirring actuator including a stirring rod and stirring blades, the stirring blades being disposed at the lower end of the stirring rod, the upper end of the stirring rod being detachably connected to a stirring rod adapter block, the stirring rod adapter block being connected to the copper nut through a guide rod.

Description

Technical Field

[0001] This utility model relates to the field of stirring lifting structures, and specifically to a stirring lifting structure. Background Technology

[0002] In the quartz ingot casting process of high-pressure vacuum electric melting furnace, it is necessary to stir the molten quartz to eliminate air bubbles, but the traditional stirring structure faces the following technical challenges:

[0003] Insufficient sealing and pressure compatibility: Conventional sealing methods cannot simultaneously meet the dual requirements of preventing gas leakage in the furnace under high pressure and avoiding external air intrusion under high vacuum. In particular, although magnetohydrodynamic seals can achieve dynamic rotary sealing, they are not resistant to high pressure and are prone to failure under high pressure.

[0004] The mixing head is not detachable: Traditional mixing structures are fixedly connected to the transmission system, making it impossible to quickly replace the mixing head according to process requirements, which affects production efficiency.

[0005] Transmission stability and anti-rotation control: If there is a lack of effective limit during the lead screw transmission process, it is easy to shake or rotate, resulting in deviation of the stirring position accuracy and affecting the de-bubbling effect.

[0006] Material compatibility under high temperature conditions: Quartz in its molten state is prone to chemical reaction when in direct contact with metals such as molybdenum, requiring special protective treatment. Utility Model Content

[0007] This invention provides a stirring and lifting structure to address the problems of existing technologies.

[0008] The objective of this utility model can be achieved through the following technical solution: A stirring lifting structure includes: a furnace cover;

[0009] Both the magnetic fluid pressure blocking device and the rotating magnetic fluid are located above the furnace cover. The rotating magnetic fluid is close to the inner side of the furnace cover and connected to the lead screw to seal the lead screw rotation gap. The magnetic fluid pressure blocking device is located below the rotating magnetic fluid to isolate the high pressure inside the furnace from the magnetic fluid sealing area.

[0010] A lead screw and a copper nut, wherein the lead screw passes through the furnace cover and is linked with a rotating magnetohydrodynamic fluid, and the copper nut cooperates with the lead screw and is limited by a guide gas pipe, and can only move up and down along the axial direction of the lead screw;

[0011] The gear transmission system includes gear one, gear two and servo motor, wherein gear two is driven by servo motor through planetary reducer and drives gear one and lead screw to rotate;

[0012] A stirring actuator includes a stirring rod and stirring blades. The stirring blades are disposed at the lower end of the stirring rod. A stirring rod adapter block is detachably connected to the upper end of the stirring rod. The stirring rod adapter block is connected to a copper nut through a guide rod. The surfaces of the stirring rod and the stirring blades are plated with a platinum layer.

[0013] An absolute encoder is coaxially connected to the upper end of a lead screw.

[0014] Cooling water pipes are installed inside the lead screw;

[0015] Water-cooled rotary joint connects the cooling water pipes to the external cooling system.

[0016] In a further improvement, the guide air pipe is provided with three sets of guide grooves inside. These guide grooves are used to prevent the lead screw and copper nut from rotating, allowing them to move only along the axial direction.

[0017] In a further improvement, the gear transmission system also includes an upper gear cover plate and a lower gear cover plate, with gear one and gear two rotatably disposed between the upper gear cover plate and the lower gear cover plate.

[0018] As a further improvement, both the guide air tube and the guide rod are provided with air guide holes that connect the inside and outside.

[0019] In a further improvement, the upper end of the stirring rod is connected to the stirring rod adapter block via molybdenum bolts, the stirring rod adapter block is connected to the lower end of the guide rod via another set of molybdenum bolts, and the stirring blade is connected to the lower end of the stirring rod via a nut.

[0020] In a further improvement, the magnetic fluid pressure blocking device is connected in series with the rotating magnetic fluid. When the furnace is under high pressure, the magnetic fluid pressure blocking device isolates the high-pressure area inside the furnace from the rotating magnetic fluid through a rigid physical barrier.

[0021] Compared with the prior art, the beneficial effects of the stirring lifting structure of this utility model are as follows:

[0022] 1. The device employs a magnetic fluid pressure blocking device in conjunction with a rotating magnetic fluid for sealing. The magnetic fluid pressure blocking device can isolate the pressure from the magnetic fluid under high-pressure conditions, enabling the device to operate in high-pressure and vacuum environments while protecting the magnetic fluid sealing performance and extending its service life.

[0023] 2. The guide tube has three guide structures inside to prevent the lead screw and copper nut from rotating, allowing them to only move up and down axially, ensuring that the stirring rod only moves up and down and does not rotate, thus improving motion stability and positioning accuracy.

[0024] 3. The stirring actuator is detachably connected by molybdenum bolts, and the stirring rod and blade surfaces are plated with platinum, which facilitates quick replacement of the stirring head to adapt to different process requirements, while avoiding chemical reaction between molybdenum and quartz, thus ensuring product quality.

[0025] 4. An absolute encoder is linked to the lead screw. By monitoring the number of rotations and angle of the lead screw, the position of the stirring rod is calculated to meet the process requirements for precise control of the stirring height.

[0026] 5. The lead screw is equipped with a cooling water pipe and is connected to an external cooling system through a water-cooled rotary joint. This allows the cooling water to circulate when the lead screw rotates, reducing the temperature of the transmission components and adapting to high-temperature working environments. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0029] Figure 3 This is a schematic diagram of the stirring actuator in this utility model.

[0030] Figure 4 This is a schematic diagram of the structure of the guide air tube in this utility model.

[0031] In the diagram, 1-furnace cover, 2-magnetic fluid pressure blocking device, 3-rotating magnetic fluid, 4-lead screw, 5-copper nut, 6-guide air pipe, 7-cooling water pipe, 8-guide rod, 9-lower cover plate of gear, 10-gear one, 11-gear two, 12-upper cover plate of gear, 13-absolute encoder, 14-water circuit rotary joint, 15-planetary reducer, 16-servo motor, 17-stirring rod adapter block, 18-molybdenum bolt, 19-stirring rod, 20-stirring blade, 21-nut, 22-air vent, 23-guide groove. Detailed Implementation

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; unless otherwise expressly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, they can refer to fixed connections or detachable connections, etc. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0033] The following describes the embodiments and appendices. Figures 1-4 The technical solution of this utility model will be further described below.

[0034] Example 1

[0035] A stirring lifting structure, comprising:

[0036] Furnace lid 1;

[0037] The magnetic fluid pressure blocking device 2 and the rotating magnetic fluid 3 are both located above the furnace cover 1. The rotating magnetic fluid 3 is close to the inner side of the furnace cover and connected to the lead screw 4 to seal the lead screw rotation gap. The magnetic fluid pressure blocking device 2 is located below the rotating magnetic fluid to isolate the high pressure inside the furnace from the magnetic fluid sealing area.

[0038] The lead screw 4 and the copper nut 5 are connected. The lead screw 4 passes through the furnace cover 1 and is linked with the rotating magnetic fluid 3. The copper nut 5 is engaged with the lead screw 4 and is limited by the guide gas pipe 6, and can only move up and down along the lead screw axis.

[0039] The gear transmission system includes a first gear 10, a second gear 11 and a servo motor 16. The second gear 11 is driven by the servo motor 16 through a planetary reducer 15, which in turn drives the first gear 10 and the lead screw 4 to rotate.

[0040] The stirring actuator includes a stirring rod 19 and a stirring blade 20. The stirring blade 20 is disposed at the lower end of the stirring rod 19. The upper end of the stirring rod 19 is detachably connected to a stirring rod adapter block 17. The stirring rod adapter block 17 is connected to a copper nut 5 through a guide rod 8. The surfaces of the stirring rod 19 and the stirring blade 20 are plated with a platinum layer.

[0041] An absolute encoder 13 is coaxially connected to the upper end of the lead screw 4;

[0042] Cooling water pipe 7 is installed inside lead screw 4;

[0043] Water rotary joint 14 connects cooling water pipe 7 to external cooling system.

[0044] like Figures 1-4 As shown, the principle of this utility model is as follows:

[0045] Power transmission path: After the servo motor 16 reduces speed and increases torque through the planetary reducer 15, it drives the second gear 11 to rotate. The second gear 11 meshes with the first gear 10, driving the lead screw 4 to rotate coaxially. Since the copper nut 5 is limited to axial movement by the guide air pipe 6, the rotational motion of the lead screw 4 is converted into the linear lifting motion of the copper nut 5, which in turn drives the stirring rod 19 and stirring blade 20 to move up and down through the guide rod 8 and the stirring rod adapter block 17.

[0046] Sealing and Pressure Control: The rotating magnetic fluid 3 is tightly attached to the inner side of the furnace cover 1, sealing the gap when the screw rod 4 rotates, thus achieving a vacuum seal under normal conditions. When the furnace is under high pressure, the magnetic fluid pressure blocking device 2 is activated, using a rigid physical barrier such as a piston structure to isolate the high-pressure area inside the furnace from the rotating magnetic fluid 3, preventing high pressure from damaging the magnetic fluid seal.

[0047] Position monitoring and cooling: The absolute encoder 13 is coaxially connected to the lead screw 4. By monitoring the number of rotations and angle of the lead screw, and combining the lead screw pitch, the absolute position of the stirring rod 19 is calculated to achieve precise positioning.

[0048] The cooling water pipe 7 inside the lead screw 4 is connected to the external cooling system through the water circuit rotary joint 14 to maintain the circulation of cooling water when the lead screw rotates, thereby reducing the temperature of the stirring rod and transmission components.

[0049] The magnetic fluid seal and pressure barrier are connected in series to form a double barrier of "vacuum sealing + pressure isolation", which enables the device to work stably in high pressure and high vacuum environments, meeting the stringent requirements of quartz ingot casting for the process environment. The guide air pipe 6 restricts the rotation of the copper nut 5, ensuring that the stirring rod 19 only moves up and down along the axial direction. With the precise positioning of the absolute encoder, the lifting error can be controlled within a small range, improving the consistency of the de-bubbling effect. The stirring rod 19 is connected to the stirring rod adapter block 17 by the molybdenum bolt 18. When changing the stirring head, only the bolt needs to be removed, and the operation time can be shortened to less than 10 minutes, improving production flexibility.

[0050] As a further preferred embodiment, the guide pipe 6 is provided with three sets of guide grooves 23 inside. The guide grooves 23 are used to prevent the lead screw 4 and the copper nut 5 from rotating, allowing them to move only axially. The inner wall of the guide pipe 6 is machined with three sets of axial guide grooves 23, which cooperate with the protruding structure on the outer periphery of the copper nut 5 to form a mechanical limit. When the lead screw 4 rotates, the protrusion of the copper nut 5 is restricted to sliding within the guide grooves 23, and cannot rotate around the lead screw axis, but can only move axially along the groove body; this ensures that the stirring rod 19 rises and falls vertically, avoids the risk of the stirring blade colliding with the crucible wall due to shaking, and at the same time improves the rigidity of the transmission system.

[0051] In a further preferred embodiment, the gear transmission system further includes an upper gear cover plate 12 and a lower gear cover plate 9, with gear one 10 and gear two 11 rotatably disposed between the upper gear cover plate 12 and the lower gear cover plate 9. Gear one 10 and gear two 11 are mounted between the upper gear cover plate 12 and the lower gear cover plate 9 via bearings, forming a closed transmission space. The upper and lower cover plates are fixed to the furnace cover 1 with bolts, providing support for the gears and restricting their axial movement.

[0052] As a further preferred embodiment, both the guide pipe 6 and the guide rod 8 are provided with guide holes 22 that extend through the inside and outside. The guide holes 22 connect the gas passage inside the furnace with the external gas passage. Under normal operating conditions, the guide holes can balance the gas pressure inside the furnace; under high-pressure operating conditions, inert gases such as argon can be introduced to maintain the atmosphere inside the furnace; at the same time, when the gas flows through the guide groove 23, it can help carry away the heat generated by the friction between the lead screw 4 and the copper nut 5.

[0053] In a further preferred embodiment, the upper end of the stirring rod 19 is connected to the stirring rod adapter block 17 via molybdenum bolts 18, and the stirring rod adapter block 17 is connected to the lower end of the guide rod 8 via another set of molybdenum bolts 18. The stirring blade 20 is connected to the lower end of the stirring rod 19 via a nut 21. The molybdenum bolts are heat-resistant, and the replacement time for a single stirring head is short.

[0054] As a further preferred embodiment, the magnetohydrodynamic pressure blocking device 2 and the rotating magnetohydrodynamic fluid 3 are connected in series. When the furnace is under high pressure, the magnetohydrodynamic pressure blocking device 2 isolates the high-pressure area inside the furnace from the rotating magnetohydrodynamic fluid 3 through a rigid physical barrier. The two are arranged in series along the axial direction of the lead screw 4. The rotating magnetohydrodynamic fluid 3 is closer to the furnace, which preferentially contacts the gas inside the furnace and provides a dynamic seal; the magnetohydrodynamic pressure blocking device 2 is located on the outside. When the pressure inside the furnace exceeds the magnetohydrodynamic tolerance threshold, its internal piston structure moves under pressure, forming a rigid isolation layer and cutting off the pressure transmission path.

[0055] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A stirring lifting structure, characterized in that, include: Stove lid; Both the magnetic fluid pressure blocking device and the rotating magnetic fluid are located above the furnace cover. The rotating magnetic fluid is close to the inner side of the furnace cover and connected to the lead screw to seal the lead screw rotation gap. The magnetic fluid pressure blocking device is located below the rotating magnetic fluid to isolate the high pressure inside the furnace from the magnetic fluid sealing area. A lead screw and a copper nut, wherein the lead screw passes through the furnace cover and is linked with a rotating magnetohydrodynamic fluid, and the copper nut cooperates with the lead screw and is limited by a guide gas pipe, and can only move up and down along the axial direction of the lead screw; The gear transmission system includes gear one, gear two and servo motor, wherein gear two is driven by servo motor through planetary reducer and drives gear one and lead screw to rotate; A stirring actuator includes a stirring rod and stirring blades. The stirring blades are disposed at the lower end of the stirring rod. A stirring rod adapter block is detachably connected to the upper end of the stirring rod. The stirring rod adapter block is connected to a copper nut through a guide rod. The surfaces of the stirring rod and the stirring blades are plated with a platinum layer. An absolute encoder is coaxially connected to the upper end of a lead screw. Cooling water pipes are installed inside the lead screw; Water-cooled rotary joint connects the cooling water pipes to the external cooling system.

2. The stirring lifting structure according to claim 1, characterized in that, The guide air pipe has three sets of guide grooves inside. The guide grooves are used to prevent the lead screw and copper nut from rotating and only allow them to move axially.

3. The stirring lifting structure according to claim 1, characterized in that, The gear transmission system also includes an upper gear cover plate and a lower gear cover plate, with gear one and gear two rotatably disposed between the upper gear cover plate and the lower gear cover plate.

4. The stirring lifting structure according to claim 1, characterized in that, Both the guide tube and the guide rod are provided with air guide holes that connect the inside and outside.

5. The stirring lifting structure according to claim 1, characterized in that, The upper end of the stirring rod is connected to the stirring rod adapter block by molybdenum bolts, and the stirring rod adapter block is connected to the lower end of the guide rod by another set of molybdenum bolts. The stirring blade is connected to the lower end of the stirring rod by a nut.

6. The stirring lifting structure according to claim 1, characterized in that, The magnetic fluid pressure blocking device is connected in series with the rotating magnetic fluid. When the furnace is under high pressure, the magnetic fluid pressure blocking device isolates the high-pressure area inside the furnace from the rotating magnetic fluid through a rigid physical barrier.

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