A combined crystallizer

Abstract

The utility model relates to crystallizer technical field discloses a combined crystallizer, including crystallization subassembly, the crystallization subassembly is provided with at least two groups, and multiple crystallization subassembly can be detachably connected together, and present linear array arrangement, and one of the group crystallization subassembly in both ends is connected with the furnace outlet, the crystallization subassembly includes mounting bracket, crystalline graphite pipe, temperature measuring piece and shielded sheath, shielded sheath connects on mounting bracket, the crystalline graphite pipe outer cover is equipped with protective sheath, the protective sheath outer layer is equipped with water cooling coil, the crystallizer of the utility model can decompose into multiple separate crystallization subassembly, can carry out the combination of multiple crystallization subassembly according to the demand, not only can accurate control metal liquid cooling rate and interval, can also avoid forming coarse grain, and simultaneously easy to replace and disassemble, can greatly reduce maintenance time, has greatly improved production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of crystallizer technology, and specifically relates to a combined crystallizer. Background Technology

[0002] Horizontal continuous casting is a common processing method for metals such as copper and aluminum. Its core equipment is a crystallizer that solidifies liquid metal into a solid shape.

[0003] Existing crystallizers mostly use a structure of graphite tubes with an external cooling water jacket, which has the following problems:

[0004] 1) Graphite tubes have poor mechanical properties and are extremely brittle. They are prone to cracking under thermal and mechanical stress. Replacing the entire tube would significantly increase material costs and downtime costs.

[0005] 2) Coarse grains are prone to appear during the crystallization process, which has a great impact on subsequent processes and often requires multiple cold working and heat treatments to remedy the situation.

[0006] Among the current utility models related to crystallizers, there are many structural designs for cooling water circuits. For example, increasing the cooling flow rate can enhance the cooling effect and prevent coarse grains; or lengthening the crystallizer can increase the cooling distance and facilitate the release of more heat; some also set heating coils on the crystallizer to improve the temperature distribution of some metals with poor fluidity and prevent premature solidification. However, existing technologies still generally have disadvantages such as complex temperature control, risk of coarse casting grains, short crystallizer life, need for overall replacement, and high material and time costs. Summary of the Invention

[0007] The purpose of this invention is to provide a crystallizer with a simple structure and reasonable design in order to solve the above problems.

[0008] This utility model achieves the above objectives through the following technical solutions:

[0009] This utility model provides a combined crystallizer, including crystallization components. The crystallization components are provided in at least two sets, and multiple sets of crystallization components are detachably connected together and arranged in a linear array. One set of crystallization components located at both ends is connected to the furnace outlet.

[0010] The crystallization assembly includes a mounting frame, a crystallized graphite tube, a temperature measuring element, and a shielding sleeve. The shielding sleeve is connected to the mounting frame. The crystallized graphite tube is covered with a protective sleeve. A water-cooled coil is provided on the outer layer of the protective sleeve. The shielding sleeve is fitted over the water-cooled coil. One end of the crystallized graphite tube extends to the outside of the protective sleeve and is fitted with an electromagnetic stirrer. The water inlet and outlet ports of the water-cooled coil both extend to the outside of the shielding sleeve. The electromagnetic stirrer is connected to the mounting frame. The temperature measuring element is installed inside the crystallized graphite tube.

[0011] As a further optimization of this utility model, the temperature measuring element is a thermocouple, which is connected to the shielding sleeve. The detection end of the thermocouple passes through the shielding sleeve and the protective sleeve and extends into the crystalline graphite tube.

[0012] As a further optimization of this utility model, the mounting frame includes a base plate, a connector, a support frame, and a support plate. The base plate is fixedly connected to the support frame, and the base plate is detachably connected to the surface of the support plate through the connector. The electromagnetic stirrer and the shielding sleeve are connected to the support frame.

[0013] As a further optimization of this utility model, the connecting member is a fixing bolt.

[0014] As a further optimization of this utility model, the support frame includes a first frame and a second frame. The first frame is connected to the electromagnetic stirrer, and the upper surface of the first frame is in contact with the surface of the electromagnetic stirrer. The second frame is connected to the shielding sleeve, and the upper surface of the second frame is in contact with the surface of the shielding sleeve.

[0015] As a further optimization of this utility model, the crystalline graphite tubes of the multiple sets of crystalline components are detachably connected, and the multiple sets of crystalline graphite tubes are connected by threads.

[0016] As a further optimization of this utility model, the crystalline graphite tube includes a working section, a front connecting section and a rear connecting section. The front connecting section and the rear connecting section are respectively connected to the two ends of the working section. The inner wall of the front connecting section is provided with an internal thread, and the outer surface of the rear connecting section is provided with an external thread. The front connecting section of a group of crystalline graphite tubes near the furnace outlet is connected to the furnace outlet through the internal thread.

[0017] As a further optimization of this utility model, the rear connecting section of a group of crystalline graphite tubes far from the furnace outlet is connected to a sealing sleeve by an external thread.

[0018] The beneficial effects of this utility model are as follows: the crystallizer of this utility model can be decomposed into multiple individual crystallization components, and multiple crystallization components can be combined according to needs. It can not only accurately control the cooling rate and range of the molten metal, but also avoid the formation of coarse grains. At the same time, it is easy to replace and disassemble, which can greatly reduce maintenance time and greatly improve production efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the dual-body combined structure crystallizer of this utility model;

[0020] Figure 2 This is a schematic diagram of the four-body combined crystallizer of this utility model.

[0021] Figure 3 This is an exploded schematic diagram of the crystallization component of this utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of the shielding sleeve of this utility model;

[0023] Figure 5 This is a schematic diagram of the crystalline graphite tube structure of this utility model.

[0024] In the diagram: 1. Mounting bracket; 101. Base plate; 102. Connector; 103. Support frame; 104. Support plate; 2. Crystallized graphite tube; 21. Working section; 22. Front connecting section; 23. Rear connecting section; 3. Thermocouple; 4. Shielding sleeve; 5. Protective sleeve; 6. Water-cooled coil; 7. Electromagnetic stirrer; 8. Sealing sleeve; 9. Internal thread; 10. External thread. Detailed Implementation

[0025] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0026] like Figures 1 to 3 As shown, a combined crystallizer includes crystallization components. At least two sets of crystallization components are provided. Multiple sets of crystallization components are detachably connected together and arranged in a linear array. One set of crystallization components located at both ends is connected to the furnace outlet.

[0027] In this embodiment, the crystallization assembly includes a mounting frame 1, a crystallized graphite tube 2, a temperature measuring element, and a shielding sleeve 4. The shielding sleeve 4 is connected to the mounting frame 1. The crystallized graphite tube 2 is covered with a protective sleeve 5. A water-cooled coil 6 is provided on the outer layer of the protective sleeve 5. The shielding sleeve 4 is fitted on the outside of the water-cooled coil 6. One end of the crystallized graphite tube 2 extends to the outside of the protective sleeve 5 and is fitted with an electromagnetic stirrer 7. The water inlet and outlet ports of the water-cooled coil 6 both extend to the outside of the shielding sleeve 4. The electromagnetic stirrer 7 is connected to the mounting frame 1, and the temperature measuring element is installed inside the crystallized graphite tube 2.

[0028] It should be noted that during the metal solidification process, the electromagnetic stirrer 7 is used to stir the molten metal, which can refine the grains and prevent coarse casting grains. The number of electromagnetic stirrers 7 can be increased as the number of crystallization components increases (i.e., one electromagnetic stirrer 7 is provided between every two crystallization components) to ensure uniform stirring effect.

[0029] The protective sleeve 5 is made of brass, which can prevent the crystallized graphite tube 2 from being directly exposed to the air and provide support for the water-cooled coil 6;

[0030] The water-cooled coil 6 is spirally wound on the surface of the protective sleeve 5. The water-cooled coil 6 is connected to the circulating cooling water supply device, which circulates cooling water through the cooling crystallized graphite tube 2, causing the metal to cool down and solidify. The circulating cooling water supply device is an existing device and will not be described in detail here.

[0031] The shielding sleeve 4 is used to shield the alternating magnetic field of the electromagnetic stirrer 7 and prevent the water-cooled coil 6 from generating induced current.

[0032] The temperature measuring element is a thermocouple 3, which is connected to the shielding sleeve 4. The sensing end of the thermocouple 3 passes through the shielding sleeve 4 and the protective sleeve 5 and extends into the crystallized graphite tube 2.

[0033] It should be noted that the number of crystallization components used in this crystallizer can be adjusted according to the actual situation. The following are the specific methods of using the crystallizer for different numbers of crystallization components:

[0034] When the requirements for temperature control accuracy and grain size are not high for the metal, a dual-body combined crystallizer structure can be used (i.e., using two sets of crystallization components, see reference). Figure 1 In this embodiment, the dual-body combined structure crystallizer includes a first crystallization component and a second crystallization component. One side of the first crystallization component is connected to a furnace. The molten metal in the furnace flows into the crystallization graphite tube 2 from the furnace outlet. First, the cooling water flow rate needs to be adjusted. When the molten metal passes through the first thermocouple in the first crystallization component, the liquid flow temperature is determined. When it passes through the first cooling water coil in the first crystallization component, the liquid flow is initially cooled. Under the action of the electromagnetic stirrer 7, the grains are initially refined. When it passes through the second thermocouple in the second crystallizer, the liquid flow is brought close to the freezing point. The cooling water flow rate is adjusted. When it passes through the second water cooling coil in the second crystallizer, solidification occurs.

[0035] When high temperature control accuracy and grain size are required for metals, a four-body combined crystallizer structure (i.e., using four sets of crystallization components, see reference) can be used. Figure 2In this embodiment, the four-body combined crystallizer includes a first crystallization component, a second crystallization component, a third crystallization component, and a fourth crystallization component. One side of the first crystallization component is connected to a furnace. Molten metal from the furnace flows into the crystallization graphite tube 2 from the furnace outlet. The cooling water flow rate is first adjusted, and the liquid flow temperature is determined when the molten metal passes through the first thermocouple in the first crystallization component. When it passes through the first water-cooling coil in the first crystallization component, the liquid flow is initially cooled. Under the action of the first electromagnetic stirrer, an electromagnetic oscillation force is generated internally, causing local compression and expansion, which is beneficial for inducing nucleation. The real-time temperature is obtained when it passes through the second thermocouple in the second crystallization component. When it passes through the second water-cooling coil in the second crystallization component, the liquid flow is further cooled. Under the action of the second electromagnetic stirrer, the temperature decrease causes the melt to... Structural and energy fluctuations cause remelting of solidified micro-regions, suppressing dendrite formation. As the liquid passes through the third thermocouple in the third crystallization assembly, real-time monitoring confirms a stable temperature decrease, approaching the solidification temperature. Then, passing through the third water-cooling coil in the third crystallization assembly, the liquid flow continues to cool further. Under the action of the third electromagnetic stirrer, the grain structure is further optimized, tending towards refinement and equiaxed crystallization. Passing through the fourth thermocouple in the fourth crystallization assembly confirms solidification. Then, passing through the fourth water-cooling coil in the fourth assembly lowers the casting temperature, preventing oxidation of the active metal surface and grain coarsening, facilitating subsequent extraction. Overall, by controlling the cooling water, the cooling gradient of the segmented thermocouples can be made consistent, meaning the liquid flow maintains a linear temperature decrease during crystallization, or a linear decrease at certain segments, thus contributing to obtaining a favorable grain structure.

[0036] Furthermore, when a section malfunctions, it does not mean the entire crystallizer is scrapped like a traditional crystallizer. Only the problematic section needs to be replaced, which greatly improves production efficiency and reduces material waste.

[0037] It should be noted that, regardless of whether it is a two-body combined structure or a four-body combined structure, the serial numbers of the first electromagnetic stirrer, the second electromagnetic stirrer, the first thermocouple or the second thermocouple, etc., are ordered from the side closest to the furnace as first, second, and so on.

[0038] In this embodiment, the mounting frame 1 includes a base plate 101, a connector 102, a support frame 103, and a support plate 104. The base plate 101 is fixedly connected to the support frame 103, and the base plate 101 is detachably connected to the surface of the support plate 104 through the connector 102. The electromagnetic stirrer 7 and the shielding sleeve 4 are connected to the support frame 103.

[0039] In this embodiment, the connector 102 is a fixing bolt.

[0040] In this embodiment, the support frame 103 includes a first frame and a second frame. The first frame is connected to the electromagnetic stirrer 7, and the upper surface of the first frame is in contact with the surface of the electromagnetic stirrer 7. The second frame is connected to the shielding sleeve 4, and the upper surface of the second frame is in contact with the surface of the shielding sleeve 4.

[0041] It should be noted that the base plate 101 is used to support each independent support frame 103; the fixing bolts connect the support frame 103 to the support plate 104; the support frame 103 provides support for the electromagnetic stirrer 7 and the shielding sleeve 4; the support plate 104 can distribute the force and ensure the structure is level.

[0042] refer to Figure 4 and Figure 5 The structure shown includes multiple sets of crystalline graphite tubes 2 that are detachably connected, and the multiple sets of crystalline graphite tubes are connected by threads.

[0043] In this embodiment, the crystalline graphite tube 2 includes a working section 21, a front connecting section 22, and a rear connecting section 23. The front connecting section 22 and the rear connecting section 23 are respectively connected to the two ends of the working section 21. The inner wall of the front connecting section is provided with an internal thread 9, and the outer surface of the rear connecting section 23 is provided with an external thread 10. The front connecting section 22 of a set of crystalline graphite tubes 2 near the furnace outlet is connected to the furnace outlet through the internal thread 9.

[0044] In practical use, when connecting two sets of crystalline graphite tubes 2, the front connecting end 22 of one set of crystalline graphite tubes 2 needs to be connected to the rear connecting section 23 of the other set of crystalline graphite tubes 2. The internal thread 9 on either set of crystalline graphite tubes 2 can be rotatably connected to the external thread 10 on the other set of crystalline graphite tubes 2.

[0045] It should be noted that the outer diameter of the working section 21 and the front connecting section 22 are the same, and the inner diameter of the front connecting section 22 is the same as the outer diameter of the rear connecting section 23.

[0046] In this embodiment, the rear connecting section 23 of a group of crystalline graphite tubes 2 far from the furnace outlet is connected to a sealing sleeve 8 via an external thread 10.

[0047] It should be noted that the sealing sleeve 8 is used to lock the external thread 10 of the last section of the crystallized graphite tube 2 (a group of crystallized graphite tubes 2 far from the furnace outlet) to prevent the crystallized graphite tube 2 from deforming.

[0048] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A combined crystallizer, characterized in that, It includes crystallization components, at least two sets of which are provided. Multiple sets of crystallization components are detachably connected together and arranged in a linear array. One set of crystallization components located at both ends is connected to the furnace outlet. The crystallization assembly includes a mounting frame, a crystallized graphite tube, a temperature measuring element, and a shielding sleeve. The shielding sleeve is connected to the mounting frame. The crystallized graphite tube is covered with a protective sleeve. A water-cooled coil is provided on the outer layer of the protective sleeve. The shielding sleeve is fitted over the water-cooled coil. One end of the crystallized graphite tube extends to the outside of the protective sleeve and is fitted with an electromagnetic stirrer. The water inlet and outlet ports of the water-cooled coil both extend to the outside of the shielding sleeve. The electromagnetic stirrer is connected to the mounting frame. The temperature measuring element is installed inside the crystallized graphite tube.

2. The combined crystallizer according to claim 1, characterized in that: The temperature measuring element is a thermocouple, which is connected to the shielding sleeve. The detection end of the thermocouple passes through the shielding sleeve and the protective sleeve and extends into the crystalline graphite tube.

3. A combined crystallizer according to claim 1, characterized in that: The mounting frame includes a base plate, a connector, a support frame, and a support plate. The base plate is fixedly connected to the support frame, and the base plate is detachably connected to the surface of the support plate through the connector. The electromagnetic stirrer and the shielding sleeve are connected to the support frame.

4. A combined crystallizer according to claim 3, characterized in that: The connecting component is a fixing bolt.

5. A combined crystallizer according to claim 3, characterized in that: The support frame includes a first frame and a second frame. The first frame is connected to the electromagnetic stirrer, and the upper surface of the first frame is in contact with the surface of the electromagnetic stirrer. The second frame is connected to the shielding sleeve, and the upper surface of the second frame is in contact with the surface of the shielding sleeve.

6. A combined crystallizer according to claim 1, characterized in that: The crystalline graphite tubes of multiple sets of crystalline components are detachably connected, and the multiple sets of crystalline graphite tubes are connected by threads.

7. A combined crystallizer according to claim 6, characterized in that: The crystalline graphite tube includes a working section, a front connecting section, and a rear connecting section. The front connecting section and the rear connecting section are respectively connected to the two ends of the working section. The inner wall of the front connecting section is provided with internal threads, and the outer surface of the rear connecting section is provided with external threads. The front connecting section of a group of crystalline graphite tubes near the furnace outlet is connected to the furnace outlet through internal threads.

8. A combined crystallizer according to claim 7, characterized in that: The rear connecting section of a set of crystalline graphite tubes, far from the furnace outlet, is connected to a sealing sleeve via an external thread.

Images