Heat insulation structure for melt of single crystal furnace

Abstract

The utility model provides a heat insulation structure for single crystal furnace melting, which relates to the technical field of single crystal furnace melting, and comprises a hanging rope with a heavy punch at the bottom and a graphite chuck at the bottom; the screw rod is arranged at the bottom of the graphite chuck, the bottom of the screw rod is sleeved with a disc, the bottom of the screw rod is in threaded connection with a nut, and the nut is located below the disc. According to the utility model, the floating of heat generated during the melting of most silicon materials can be prevented, and the heat is prevented from being taken away by a water cooling screen in the single crystal furnace after the floating of most heat, so that the melting time of the silicon materials is prevented from being increased, and more energy sources are not required to be consumed for melting the silicon materials.

Description

TECHNICAL FIELD

[0001] The utility model relates to single crystal furnace melt technology field, concretely relates to a single crystal furnace melt is with heat insulation structure. BACKGROUND

[0002] In the single crystal silicon industry, when the single crystal furnace is stopped and the corresponding cleaning and maintenance are completed, before the single crystal furnace is combined, a pot of silicon material is preloaded in the crucible, the crucible preloaded with the silicon material is placed in the single crystal furnace, then the silicon material in the crucible is heated and melted by the graphite heater, after the silicon material in the crucible is melted, the molten material is divided and injected multiple times, until the molten silicon material in the crucible reaches the specified silicon material weight, that is, the "melting process" is completed.

[0003] In the above-mentioned melting process of the silicon material in the single crystal furnace, since the crucible is at the bottom of the single crystal furnace, and in the single crystal furnace, the upper half of the main furnace chamber includes a water-cooled screen and a flow guide cylinder suspended directly above the crucible, when the silicon material in the crucible is heated and melted, the heat will float up and pass through the middle area of the water-cooled screen, and part of the heat will be taken away by the cooling circulating water of the water-cooled screen, thereby reducing the heat in the single crystal furnace, prolonging the melting time of the silicon material, and increasing the heating power and electric energy required for melting the silicon material, resulting in excessive energy consumption. In addition, the inner cavity size of the graphite chuck installed with the seed crystal will change, so a suitable water-cooled screen needs to be selected for use, and different water-cooled screens have different sizes of cooling areas in the middle, which will result in more and faster heat loss. SUMMARY

[0004] The utility model discloses a heat insulation structure for single crystal furnace melting, which can insulate most of the heat generated during the melting of the silicon material, prevent most of the heat from being taken away by the water-cooled screen in the single crystal furnace, thereby avoiding the increase of the melting time of the silicon material and the further consumption of energy for melting the silicon material.

[0005] The utility model discloses a heat insulation structure for single crystal furnace melting, which can insulate most of the heat generated during the melting of the silicon material, prevent most of the heat from being taken away by the water-cooled screen in the single crystal furnace, thereby avoiding the increase of the melting time of the silicon material and the further consumption of energy for melting the silicon material.

[0006] A heat insulation structure for single crystal furnace melting is provided, which comprises:

[0007] The bottom of the hanging rope is provided with a heavy hammer, and the bottom of the heavy hammer is provided with a graphite chuck; a screw rod is arranged at the bottom of the graphite chuck, a disc is sleeved at the bottom of the screw rod, and a nut is threadedly connected to the bottom of the screw rod, and the nut is located below the disc.

[0008] Optionally, the inner part of the disc is provided with an annular cavity, the outer wall of the disc is provided with a plurality of sliding grooves in the circumferential direction, and the inner part of the disc is further provided with a plurality of through holes for connecting the annular cavity and the plurality of sliding grooves; the inner part of the disc is provided with a plurality of sliding blocks corresponding to the through holes, each sliding block is in sliding connection with the disc through each corresponding through hole; the outer wall of each sliding block is provided with a stop block, and each stop block is in sliding connection with the disc through each corresponding sliding groove.

[0009] Optionally, the sliding groove comprises a first sliding groove and a second sliding groove, adjacent first sliding grooves and second sliding grooves are distributed in the circumferential direction of the disc and are not connected between adjacent first sliding grooves and second sliding grooves; the stop block comprises a first stop block and a second stop block, each first stop block is in sliding connection with the disc through each first sliding groove, and each second stop block is in sliding connection with the disc through each second sliding groove; the inner part of the disc is rotatably connected with a rotating ring located in the annular cavity, the central axis of the rotating ring is consistent with the central axis of the disc; the rotating ring is hingedly connected with the first sliding block and the second sliding block through a connecting rod.

[0010] Optionally, each first stop block and its two adjacent second stop blocks have an overlapping part; the hinged connecting rod on the outer wall of the first sliding block and the hinged connecting point of the rotating ring are located at the top of the rotating ring, and the hinged connecting rod on the outer wall of the second sliding block and the hinged connecting point of the rotating ring are located at the bottom of the rotating ring.

[0011] Optionally, the top of the disc is provided with a plurality of through grooves in the circumferential direction with the center point of the disc as the center, and each through groove is in communication with the annular cavity; the inner part of the disc is rotatably connected with a rotating ring located in the annular cavity, the central axis of the rotating ring is consistent with the central axis of the disc; the top of the rotating ring is provided with a connecting block, the connecting block is arranged on the same central axis as the rotating ring, the top of the connecting block is provided with a plurality of push blocks corresponding to the plurality of through grooves, and each push block is in sliding connection with the disc through each through groove.

[0012] Optionally, the screw rod is sleeved with a dial located on the disc, the bottom of the dial is provided with a clamping groove corresponding to the plurality of push blocks, and each push block is clamped with the dial through each clamping groove.

[0013] Optionally, the top of the dial is provided with a plurality of vertical rods in the circumferential direction with the center point of the dial as the center, and the top of each vertical rod is provided with a clamping ring sleeved on the graphite chuck.

[0014] Optionally, the outer diameter of the disc is smaller than the inner diameter of the water-cooled screen, the distance between the outer edge of the first stop block and the central axis of the disc is smaller than the inner diameter of the water-cooled screen, and the distance between the outer edge of the second stop block and the central axis of the disc is smaller than the inner diameter of the water-cooled screen.

[0015] Optionally, the bottom of the disc is provided with a horn-shaped flow guide cover.

[0016] Optionally, the first block, the second block, the first slider, the second slider, the connecting rod, the rotating ring, the connecting block, the pushing block, the dial, the vertical rod, the snap ring and the fairing are made of high-temperature resistant material.

[0017] The utility model discloses the beneficial effects are:

[0018] 1. the graphite chuck is installed at the bottom of the heavy hammer, and the graphite chuck is used to hold the screw rod, and the disc is sleeved on the bottom of the screw rod, so that the disc can move up and down along the central axis of the screw rod, then the nut is fastened on the bottom of the screw rod, preventing the disc from falling off the screw rod, then the screw rod with the sleeved disc is sent to the water-cooled screen in the single crystal furnace through the adjustment of the hanging rope, until the disc on the screw rod is located at the lower edge of the water-cooled screen, stop adjusting the hanging rope.

[0019] 2. through the detachable connection between the disc, the screw rod and the nut, the disc of the size requirement can be designed according to the size of the cooling area in the middle of the water-cooled screen, and the adaptive disc is installed on the screw rod, and the limiting is realized by the nut fastened on the screw rod, that is, the isolation of most heat in the single crystal furnace under different size requirements can be completed. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 It is a structure diagram of a single crystal furnace melting material heat insulation structure.

[0022] Figure 2 It is a structure diagram of a disc.

[0023] Figure 3 It is an assembly structure diagram of the disc, the dial and the fairing.

[0024] Figure 4 It is a top view of the disc.

[0025] Figure 5 It is a bottom view of the dial.

[0026] Marked: 1 - hanging rope, 2 - weight, 3 - graphite chuck, 4 - screw rod, 5 - disc, 50 - first sliding groove, 51 - second sliding groove, 52 - first stop block, 53 - second stop block, 54 - first sliding block, 55 - second sliding block, 56 - through hole, 57 - connecting rod, 58 - rotating ring, 59 - connecting block, 590 - shifting block, 591 - through groove, 6 - nut, 7 - flow guide cylinder, 8 - water cooling screen, 9 - dial, 90 - clamping groove, 10 - vertical rod, 11 - clasp, 12 - flow guide cover. DETAILED DESCRIPTION

[0027] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0028] The following disclosure provides many different embodiments or examples for implementing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model.

[0029] The embodiments of the utility model will be described in detail below with reference to the drawings.

[0030] Embodiment

[0031] As Figure 1 shown, the embodiment provides a single crystal furnace molten material heat insulation structure, comprising:

[0032] The hanging rope 1 is provided with a weight 2 at the bottom, and the bottom of the weight 2 is provided with a graphite chuck 3.

[0033] The screw rod 4 is arranged at the bottom of the graphite chuck 3, the bottom of the screw rod 4 is sleeved with a disc 5, the bottom of the screw rod 4 is threadedly connected with a nut 6, and the nut 6 is located below the disc 5.

[0034] In use, the hanging rope 1 is specifically a tungsten wire rope, which has the advantages of high temperature resistance, wear resistance and tensile resistance. In addition, the disc, screw rod and nut are all made of high temperature resistant materials, so that the hanging rope, disc, screw rod and nut can all adapt to the high temperature environment of the single crystal furnace. The bottom of the hanging rope 1 is connected to the weight 2, the bottom of the weight 2 is provided with a graphite chuck 3, the graphite chuck 3 is used to clamp the screw rod 4, after the disc 5 is sleeved on the screw rod 4, the nut 6 is fastened on the screw rod 4 to prevent the disc 5 from falling off, then the assembly of the screw rod 4 and the disc 5 is gradually sent into the single crystal furnace by adjusting the hanging rope 1, until the disc 5 is at the lower edge of the water-cooled screen 8, and the adjustment of the hanging rope 1 is stopped. As the silicon material in the crucible of the single crystal furnace is heated and melted, the heat generated is floated and isolated by the disc 5, so that the heat stays in the single crystal furnace for a longer time, which increases the temperature in the single crystal furnace, helps the silicon material to melt, and reduces the required energy consumption. When the silicon material in the crucible is melted, the screw rod 4 and the disc 5 are taken out of the single crystal furnace by adjusting the hanging rope 1, and then the melting process of the silicon material is completed. It is worth noting that the assembly process of the disc, screw rod and nut is completed outside the single crystal furnace.

[0035] In the above embodiment, if the middle cooling area of the water-cooled screen needs to be changed in size in the actual molten material environment, the entire heat insulation structure needs to be disassembled and replaced, and then a suitable disc size is selected according to the actual size of the middle cooling area of the water-cooled screen for installation, so as to achieve better heat insulation effect.

[0036] In one of the embodiments, as shown in Figure 2 The inner part of the disc 5 is provided with an annular cavity, and the outer wall of the disc 5 is provided with a plurality of sliding grooves in the circumferential direction. The inner part of the disc 5 is also provided with a plurality of through holes 56 for connecting the annular cavity and the plurality of sliding grooves. The inner part of the disc 5 is provided with a plurality of sliding blocks corresponding to the through holes 56, and each sliding block is connected to the disc 5 through each corresponding through hole 56. The outer wall of each sliding block is provided with a stop block, and each stop block is connected to the disc 5 through each corresponding sliding groove.

[0037] In use, by pulling the stopper, the stopper is pulled out of the sliding groove, and during this period, since the stopper is arranged on the sliding block and the sliding block is connected with the disc 5 through the through hole 56, the stopper can move back and forth in the sliding groove in a direction perpendicular to the central axis of the disc 5, thereby achieving the effect of adjusting the size of the disc 5 to adapt to different use environments. Specifically, a plurality of sliding grooves are arranged on the side wall of the disc 5, and the groove direction of each sliding groove is towards the central axis of the disc 5. An annular cavity is arranged in the interior of the disc 5, and the annular cavity and each sliding groove are connected through the through hole 56, that is, the number of through holes 56 and sliding grooves is the same and the positions of the through holes 56 and sliding grooves correspond to each other. In addition, the central axis of each through hole 56 is perpendicular to the central axis of the disc 5. The stopper is arranged at one end of the sliding block towards the sliding groove, and the stopper is connected with the disc 5 through the sliding groove, so that the stopper can move back and forth in the sliding groove in a direction perpendicular to the central axis of the disc 5. It is worth noting that the adjacent sliding grooves can be connected or not connected, and the difference between the two is only the size of the gap between the adjacent stoppers after the stoppers are extended, and the change of heat loss rate caused by the size of the gap.

[0038] In one embodiment, as shown in Figure 2 and Figure 3 the sliding groove includes a first sliding groove 50 and a second sliding groove 51, and the adjacent first sliding groove 50 and second sliding groove 51 are distributed in the circumferential direction of the disc 5 and are not connected between each other; the stopper includes a first stopper 52 and a second stopper 53, each first stopper 52 is connected with the disc 5 through each first sliding groove 50, and each second stopper 53 is connected with the disc 5 through each second sliding groove 51; the interior of the disc 5 is rotationally connected with a rotating ring 58 located in the annular cavity, and the central axis of the rotating ring 58 is consistent with the central axis of the disc 5; the connecting rod 57 is hinged between the rotating ring 58 and the first sliding block 54 and the second sliding block 55.

[0039] In use, the first and second blocks 52, 53 are arranged in cross, such that each first block 52 is above each second block 53, and after the first and second blocks 52, 53 are opened, there is no gap between adjacent first and second blocks 52, 53 in the circumferential direction of the disc 5, so that the heat can be insulated according to the actual size requirements under different size changes. Specifically, the sliding groove is divided into a first sliding groove 50 and a second sliding groove 51, the first sliding groove 50 is above the second sliding groove 51; the block is divided into a first block 52 and a second block 53, the first block 52 is slidably connected to the disc 5 through the first sliding groove 50, and the second block 53 is slidably connected to the disc 5 through the second sliding groove 51, the purpose is to separate the first block 52 and the second block 53, and after the first block 52 and the second block 53 are opened, avoid the first block 52 and the second block 53 have a gap, so as to prevent the heat from leaking out to the middle area of the water cooling screen 8 in advance. The center axis of the rotating ring 58 is coaxial with the center axis of the disc 5, the top and bottom of the rotating ring 58 are hinged with connecting rods 57, among which the other end of the connecting rod 57 hinged at the top of the rotating ring 58 is hinged with the first sliding block 54, and the other end of the connecting rod 57 hinged at the bottom of the rotating ring 58 is hinged with the second sliding block 55. When the rotating ring 58 rotates, the top and bottom of the rotating ring 58 drive the first sliding block 54 and the second sliding block 55 to slide through the corresponding connecting rods 57, so as to realize the expansion adjustment of the first block 52 and the second block 53 at the same time.

[0040] In one embodiment, each first block 52 has an overlapping portion between itself and its two adjacent second blocks 53; the hinge points of the connecting rods 57 hinged on the outer wall of the first sliding block 54 and the rotating ring 58 are located at the top of the rotating ring 58, and the hinge points of the connecting rods 57 hinged on the outer wall of the second sliding block 55 and the rotating ring 58 are located at the bottom of the rotating ring 58.

[0041] When in use, the two ends of the first block 52 in the circumferential direction of the disc 5 have overlapping parts between the two second blocks 52 adjacent to the first block 52 in the direction of the central axis of the disc 5, which means that when the first block 52 or the second block 53 moves up and down in the direction of the central axis of the disc 5, the first block 52 and the second block 53 will have overlapping parts, which can be in contact between the first block 52 and the second block 53, or not in contact between the first block 52 and the second block 53 and have a distance between them in the direction of the central axis of the disc 5. The difference between the two cases is mainly whether the heat will leak out from the distance between the first block 52 and the second block 53 after the first block 52 and the second block 53 are extended. If the first block 52 and the second block 53 are in contact, the heat in the single crystal furnace can be better insulated; if the first block 52 and the second block 53 are not in contact, part of the heat will leak out from the distance between the first block 52 and the second block 53.

[0042] In one embodiment, as shown in Figure 4 The top of the disc 5 is provided with a plurality of through grooves 591 around the center point of the disc 5, and each through groove 591 is in communication with the annular cavity; the inside of the disc 5 is rotatably connected with a rotating ring 58 located in the annular cavity, and the central axis of the rotating ring 58 is consistent with the central axis of the disc 5; the top of the rotating ring 58 is provided with a connecting block 59 which is arranged on the same central axis as the rotating ring 58, and the top of the connecting block 59 is provided with a plurality of push blocks 590 corresponding to the plurality of through grooves 591, and each push block 590 is slidably connected with the disc 5 through each through groove 591.

[0043] In use, by rotating the dial 9, the connecting block 59 at the bottom of the dial 9 is rotated, and the rotating ring 58 in the annular cavity is rotated, and the first stop block 52 and the second stop block 53 are moved, so that the size of the disc 5 is adjusted to adapt to different use environments. Specifically, the top of the disc 5 is provided with a plurality of through grooves 591, each through groove 591 is circumferentially arranged with the center point of the disc 5 as the center, and the through groove 591 connects the annular cavity in the disc 5 with the outside. The connecting block 59 is arranged at the top of the rotating ring 58, and the connecting block 59 is coaxial with the center axis of the rotating ring 58, and the top of the connecting block 59 is below each through groove 591. A plurality of dial blocks 590 are circumferentially arranged on the top of the connecting block 59 with the center point of the disc 5 as the center, and the number of dial blocks 590 is consistent with the number of through grooves 591 and one-to-one correspondence. Each dial block 590 is slidably connected with the disc 5 through the corresponding through groove 591, that is, the dial block 590 moves back and forth in the through groove 591 along the groove direction of the through groove 591, so as to realize the expansion and contraction adjustment of the first stop block 52 and the second stop block 53.

[0044] In one embodiment, as shown in Figure 3 、 Figure 4 and Figure 5 , the dial 9 is sleeved on the screw rod 4 and located on the disc 5. The bottom of the dial 9 is provided with a plurality of clamping grooves 90 corresponding to the dial blocks 590, and each dial block 590 is clamped with the dial 9 through each clamping groove 90.

[0045] In use, the dial 9 drives the connecting block 59 at the bottom of the dial block 590 to rotate through the clamping of the dial block 590 and the clamping groove 90, and the rotating ring 58 in the annular cavity is rotated, so that the expansion and contraction of the first stop block 52 and the second stop block 53 around the disc 5 are adjusted by adjusting the rotation of the dial 9, which improves the application range of the heat insulation structure, and the heat insulation structure does not need to be disassembled and replaced according to different sizes, which is convenient to operate and saves time and effort.

[0046] In one embodiment, the top of the dial 9 is circumferentially provided with a plurality of vertical rods 10 with the center point of the dial 9 as the center, and each vertical rod 10 is provided with a clamping ring 11 sleeved on the graphite chuck 3.

[0047] In use, by rotating the snap ring 11 on the graphite chuck 3, the snap ring 11 drives the dial 9 to rotate through the vertical rod 10 arranged on the dial 9, and the dial 9 drives the connecting block 59 arranged at the bottom of the plurality of dial blocks 590 to rotate through the clamping of the dial block 590 and the clamping groove 90, and the rotation of the connecting block 59 drives the rotating ring 58 in the annular cavity to rotate, so that the adjustment of the external snap ring 11 can adjust the expansion and contraction of the first stop block 52 and the second stop block 53 around the disc 5, thereby improving the application range of the heat insulation structure, and without the need to disassemble and replace the heat insulation structure according to different sizes, the operation is convenient, time-saving and labor-saving.

[0048] In one of the embodiments, the outer diameter of the disc 5 is smaller than the inner diameter of the water-cooled screen 8, the distance between the outer edge of the first stop block 52 and the central axis of the disc 5 is smaller than the inner diameter of the water-cooled screen 8, and the distance between the outer edge of the second stop block 53 and the central axis of the disc 5 is smaller than the inner diameter of the water-cooled screen 8.

[0049] In use, the outer diameter of the disc 5 needs to be smaller than the inner diameter of the water-cooled screen 8, so that there is a gap between the disc 5 and the water-cooled screen 8, which is used for the heat in the single crystal furnace to flow out from here, so that the heat does not accumulate in the single crystal furnace, causing the temperature in the single crystal furnace to rise sharply, affecting the use of the single crystal furnace. The outer edge of the first stop block 52 and the outer edge of the second stop block 53 to the central axis of the disc 5 are smaller than the inner diameter of the water-cooled screen 8, so that the overall heat insulation structure can always leave a gap for the heat to flow out to the central area of the water-cooled screen 8 when meeting various actual different use environment conditions, avoiding too much heat accumulation affecting the use of the single crystal furnace.

[0050] In one of the embodiments, as shown in Figure 3 The bottom of the disc 5 is provided with a horn-shaped flow deflector 12.

[0051] In use, the bottom of the disc 5 is provided with the flow deflector 12, and the large-diameter end of the flow deflector 12 faces the crucible in the single crystal furnace. When the crucible in the single crystal furnace is heated and the silicon material is melted, the generated heat rises until it collides with the disc 5, and the heat accumulates at the bottom of the disc 5. As the heat gradually increases, the heat accumulated at the bottom of the disc 5 begins to dissipate towards the periphery of the disc 5, until the heat flows out from the gap between the disc 5 and the water-cooled screen 8 and enters the central area of the water-cooled screen 8, and is taken away by the circulating cooling water of the water-cooled screen 8, that is, it can play the effect of isolating most of the heat. After the flow deflector 12 is added, the heat rises and accumulates inside the flow deflector 12, and as the heat accumulates too much, the heat dissipating towards the periphery of the flow deflector 12 is guided by the curved side wall of the flow deflector 12 to a position closer to the crucible, prolonging the time for the heat to stay in the single crystal furnace, which is beneficial to the melting of the silicon material in the crucible.

[0052] In one of the embodiments, the first block 52, the second block 53, the first slider 54, the second slider 55, the connecting rod 57, the rotating ring 58, the connecting block 59, the pushing block 590, the dial 9, the vertical rod 10, the snap ring 11 and the fairing 12 are made of high-temperature resistant material.

[0053] In use, the first block 52, the second block 53, the first slider 54, the second slider 55, the connecting rod 57, the rotating ring 58, the connecting block 59, the pushing block 590, the dial 9, the vertical rod 10, the snap ring 11 and the fairing 12 are made of high-temperature resistant material, so as to be used in the high-temperature environment in the single crystal furnace.

[0054] Finally, it should be noted that: the above is only the preferred embodiments of the present application, and is not intended to limit the present application, for those skilled in the art, the present application can have various changes and variations, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A heat insulation structure for melting charge in a single crystal furnace, characterized in that, The utility model relates to a graphite clamp device for water-cooled screen, including: a hanging rope is equipped with heavy hammer at the bottom, the bottom of heavy hammer is equipped with graphite clamp head; screw rod is equipped in the bottom of graphite clamp head, the bottom of screw rod is sleeved with disc, the bottom of screw rod is connected with nut in screw thread, nut is located below disc.

2. The heat shield structure for a melt of a single crystal furnace according to claim 1, wherein The inside of the disc is provided with an annular cavity, a plurality of sliding grooves are circumferentially formed on the outer wall of the disc, and a plurality of through holes for connecting the annular cavity and the plurality of sliding grooves are further formed in the disc; a plurality of sliding blocks corresponding to the through holes are arranged in the disc, each sliding block is slidably connected with the disc through each corresponding through hole; an outer wall of each sliding block is provided with a stop block, and each stop block is slidably connected with the disc through each corresponding sliding groove.

3. The heat shield structure for a melt of a single crystal furnace according to claim 2, wherein The sliding groove includes a first sliding groove and a second sliding groove, adjacent first sliding grooves and second sliding grooves are distributed in the circumferential direction of the disc, and adjacent first sliding grooves and second sliding grooves are not connected; the sliding block includes a first sliding block and a second sliding block, the first sliding block is located in the through hole connected with the first sliding groove, and the second sliding block is located in the through hole connected with the second sliding groove; the stop block includes a first stop block and a second stop block, each first stop block is slidably connected with the disc through each first sliding groove, and each second stop block is slidably connected with the disc through each second sliding groove; a rotating ring located in the annular cavity is rotatably connected in the disc, and the central axis of the rotating ring is consistent with the central axis of the disc; a connecting rod is hingedly connected between the rotating ring and the first sliding block and the second sliding block.

4. The heat shield structure for a melt of a single crystal furnace according to claim 3, wherein Each first stop block has an overlapping part between itself and the two adjacent second stop blocks; the hinge point between the connecting rod hingedly connected to the outer wall of the first sliding block and the rotating ring is located at the top of the rotating ring, and the hinge point between the connecting rod hingedly connected to the outer wall of the second sliding block and the rotating ring is located at the bottom of the rotating ring.

5. The heat shield structure for a melt of a single crystal furnace according to claim 3, wherein A plurality of through grooves are circumferentially formed on the top of the disc with the center point of the disc as the center, and each through groove is connected with the annular cavity; the top of the rotating ring is provided with a connecting block, the connecting block is arranged on the same central axis as the rotating ring, the top of the connecting block is provided with a plurality of push blocks corresponding to the plurality of through grooves, and each push block is slidably connected with the disc through each through groove.

6. The heat shield structure for a melt of a single crystal furnace according to claim 5, wherein A dial is sleeved on the disc, a plurality of clamping grooves corresponding to the plurality of push blocks are formed in the bottom of the dial, and each push block is clamped with the dial through each clamping groove.

7. The heat shield structure for a melt of a single crystal furnace according to claim 6, wherein A plurality of vertical rods are circumferentially arranged on the top of the dial with the center point of the dial as the center, and a clamping ring is sleeved on the graphite clamp head at the top of each vertical rod.

8. The heat shield structure for a melt of a single crystal furnace according to claim 6, wherein The outer diameter of the disc is smaller than the inner diameter of the water-cooled screen, the maximum distance between the outer edge of the first stop block and the central axis of the disc is smaller than the inner diameter of the water-cooled screen, and the maximum distance between the outer edge of the second stop block and the central axis of the disc is smaller than the inner diameter of the water-cooled screen.

9. The heat shield structure for a melt of a single crystal furnace according to claim 7, wherein The bottom of the disc is provided with a horn-shaped flow guide cover.

10. The heat shield structure for a melt of a single crystal furnace according to claim 9, wherein The first block, the second block, the first slider, the second slider, the connecting rod, the rotating ring, the connecting block, the shifting block, the dial, the vertical rod, the snap ring and the flow deflector are made of high-temperature-resistant material.

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