Single crystal silicon rod ingot taking-out vehicle anti-scalding heat insulation device

Abstract

The utility model discloses a single crystal silicon rod crystal taking vehicle anti -scald heat insulating device relates to single crystal silicon technical field, including crystal taking vehicle body, crystal taking vehicle body top is provided with two recesss, and the top of crystal taking vehicle body is placed with the outer layer heat shield, and the outer layer heat shield is semicircular shape, and the inner portion of outer layer heat shield is provided with heat insulation structure, the heat insulation operation of the crystal of placing on crystal taking vehicle body is completed to this device through heat insulation structure, and the first arc -shaped guide block in the outer layer heat shield provides the direction for the movement of middle layer heat shield, and first arc -shaped limiting piece can prevent middle layer heat shield from completely sliding out from the outer layer heat shield, and the second arc -shaped guide block in middle layer heat shield is the movement direction for inner layer heat shield, and second arc -shaped limiting piece can avoid inner layer heat shield from completely sliding out from middle layer heat shield, through this kind of multi -section nested structure, can according to the length of single crystal silicon rod, and flexible stretching or contraction heat shield, can completely cover high temperature single crystal silicon rod when stretching, and it is convenient to store when contracting.

Description

Technical Field

[0001] This utility model relates to the field of monocrystalline silicon technology, specifically a heat insulation and anti-scalding device for a monocrystalline silicon rod extraction cart. Background Technology

[0002] In the monocrystalline silicon production process, the crystal removal vehicle plays a crucial role in transporting the freshly removed high-temperature monocrystalline silicon rods. The surface temperature of the freshly removed monocrystalline silicon rods is extremely high, typically reaching 250–350°C. Such high temperatures can easily cause accidental burns to operators, failing to meet the safety protection requirements of the Emergency Management Bureau.

[0003] Existing protective methods mostly involve fixing a heat shield to the top of the crystal-retrieving cart with multiple bolts. While this provides some insulation, dismantling the heat shield when it is damaged is inconvenient. Traditional corrugated pipe-type protective structures, although expandable, lack sufficient insulation performance to meet the high-temperature protection requirements of the crystal-retrieving cart. Therefore, those skilled in the art have provided a heat-insulating device for preventing scalding on monocrystalline silicon rod crystal-retrieving carts to address the problems mentioned in the background section. Utility Model Content

[0004] The purpose of this invention is to provide a heat-insulating device for preventing scalding on a single-crystal silicon rod extraction vehicle, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A heat-insulating device for a single-crystal silicon rod extraction cart includes an extraction cart body, a heat insulation structure, a fixing structure, and a positioning structure. The extraction cart body has two grooves on its top. An outer heat insulation cover, which is semi-circular in shape, is placed on the top of the extraction cart body. A heat insulation structure is installed inside the outer heat insulation cover. First protruding blocks are symmetrically connected to the outer walls of the outer heat insulation cover, and each of the two outer walls of the first protruding blocks has a locking groove. Fixing blocks are fixedly connected to both outer walls of the extraction cart body. A fixing structure is installed inside each fixing block, and a positioning structure is installed at the top of each fixing block.

[0007] As a further embodiment of this utility model: the heat insulation structure includes a first arc-shaped guide block, a first silicone sealing ring, a first arc-shaped heat insulation pad, a middle heat insulation cover, a first arc-shaped limiting block, a second arc-shaped guide block, a second silicone sealing ring, a second arc-shaped heat insulation pad, an inner heat insulation cover, and a second arc-shaped limiting block. The first arc-shaped guide block is fixedly connected to the inner wall of the outer heat insulation cover, and the middle heat insulation cover is inserted into the outer heat insulation cover. One end of the middle heat insulation cover is fixedly connected to the first arc-shaped limiting block, and the middle heat insulation cover is located inside the first arc-shaped guide block.

[0008] As a further embodiment of this utility model: the outer heat insulation cover has a first through groove at its end that is adapted to the middle heat insulation cover, and a first silicone sealing ring is fixedly connected in the first through groove; a first arc-shaped heat insulation pad is fixedly connected at the end of the outer heat insulation cover; a second arc-shaped guide block is fixedly connected on the inner side wall of the middle heat insulation cover; and an inner heat insulation cover is inserted into the middle heat insulation cover.

[0009] As a further embodiment of this utility model: one end of the inner heat insulation cover is fixedly connected to a second arc-shaped limiting block, and the inner heat insulation cover is located inside the second arc-shaped guide block. The end of the middle heat insulation cover is provided with a second through groove that is adapted to the inner heat insulation cover, and a second silicone sealing ring is fixedly connected in the second through groove. The end of the middle heat insulation cover is fixedly connected to a second arc-shaped heat insulation pad.

[0010] As a further embodiment of this utility model: the outer heat insulation cover consists of a silicone buffer layer, a ceramic fiber heat insulation layer and a heat insulation composite layer from the outside to the inside, and the silicone buffer layer is made of addition-type silicone with a Shore hardness of 60, and the outer heat insulation cover, the middle heat insulation cover and the inner heat insulation cover are made of the same material.

[0011] As a further embodiment of this utility model: the fixing structure includes a positive and negative lead screw, a first threaded sleeve, a sliding groove and a snap-fit ​​block. The positive and negative lead screw is rotatably connected inside the fixing block, and one end of the positive and negative lead screw passes through the fixing block and is fixedly connected to a first turntable. Two first threaded sleeves are threadedly connected to the positive and negative lead screws. A sliding groove adapted to the first threaded sleeve is opened at the top of the fixing block, and a snap-fit ​​block adapted to the snap-fit ​​groove is fixedly connected to one end of each of the two first threaded sleeves that is close to each other.

[0012] As a further embodiment of this utility model: the positioning structure includes an auxiliary rod, a threaded rod, a second turntable, a second threaded sleeve, and a plug-in block. The top of the fixed block is fixedly connected to the auxiliary rod, the top of the fixed block is rotatably connected to the threaded rod, the top of the threaded rod is fixedly connected to the second turntable, the threaded rod is threadedly connected to the second threaded sleeve, and the bottom of the second threaded sleeve is fixedly connected to the plug-in block.

[0013] As a further improvement of this utility model: two second protruding blocks are symmetrically connected on the outer wall of the inner heat insulation cover, and the top of the second protruding block is provided with a plug-in groove that is compatible with the plug-in block.

[0014] As a further improvement of this utility model: two rollers are fixedly connected to the bottom of the inner heat insulation cover at the end away from the second arc-shaped limiting block, and the rollers are slidably connected to the groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This device achieves heat insulation of the crystal placed on the crystal-retrieving vehicle through the setting of a heat insulation structure. The first arc-shaped guide block inside the outer heat insulation cover guides the movement of the middle heat insulation cover, and the first arc-shaped limiting block prevents the middle heat insulation cover from completely sliding out of the outer heat insulation cover. The second arc-shaped guide block inside the middle heat insulation cover guides the movement of the inner heat insulation cover, and the second arc-shaped limiting block prevents the inner heat insulation cover from completely sliding out of the middle heat insulation cover. Through this multi-section nested structure, the heat insulation cover can be flexibly stretched or contracted according to the length of the single crystal silicon rod. When stretched, it can completely cover the high-temperature single crystal silicon rod, and when contracted, it is easy to store. The first silicone sealing ring and the first arc-shaped heat insulation pad at the end of the outer heat insulation cover play a sealing and heat insulation role when the middle heat insulation cover and the outer heat insulation cover are in contact, blocking heat from escaping from the gap between the two. The second silicone sealing ring and the second arc-shaped heat insulation pad at the end of the middle heat insulation cover also achieve sealing and heat insulation when the middle heat insulation cover and the inner heat insulation cover are in contact.

[0017] 2. This device completes the fixing operation of the outer heat shield through the setting of the fixing structure. By rotating the first turntable, the positive and negative lead screws are rotated, which in turn drives the two first threaded sleeves to move closer to each other. The snap-fit ​​blocks at their ends will be inserted into the snap-fit ​​grooves on the first protruding block on the outer side wall of the outer heat shield, thereby fixing the outer heat shield to the crystal picking vehicle body and preventing the high temperature area from being exposed due to the heat shield loosening. When the two first threaded sleeves move away from each other, the snap-fit ​​blocks will be released from the snap-fit ​​grooves, and the fixing can be released.

[0018] 3. This device completes the positioning operation of the inner heat shield through the setting of the positioning structure. By rotating the second turntable, the second threaded sleeve is driven to move downward, so that the bottom plug block is inserted into the plug groove on the second protruding block on the outer side wall of the inner heat shield, thereby positioning the inner heat shield. It can directly restrict the movement of the inner heat shield along the extension direction. Even if the crystal picking car is bumpy during transportation, the heat shield will not retract or shift, ensuring the integrity of high temperature protection. Attached Figure Description

[0019] Figure 1 This is a perspective view of a heat insulation and anti-scalding device for a single-crystal silicon rod extraction vehicle.

[0020] Figure 2 This is a perspective view of the crystal-retrieving cart body in a heat-insulating device for retrieving single-crystal silicon rods.

[0021] Figure 3 This is a three-dimensional view of the outer heat insulation cover, middle heat insulation cover, and inner heat insulation cover in a single-crystal silicon rod extraction vehicle anti-scalding and heat insulation device.

[0022] Figure 4 This is a top sectional view of the outer heat insulation cover in a heat insulation device for a single-crystal silicon rod extraction vehicle.

[0023] Figure 5This is an enlarged view of A in a heat-insulating device for preventing scalding in a single-crystal silicon rod extraction vehicle.

[0024] Figure 6 This is an enlarged view of B in a heat-insulating device for preventing scalding in a single-crystal silicon rod extraction vehicle.

[0025] Figure 7 This is an enlarged view of C in a heat-insulating device for preventing scalding in a single-crystal silicon rod extraction vehicle.

[0026] In the diagram: 1. Crystal extraction vehicle body; 2. Groove; 3. Outer heat shield; 4. First arc-shaped guide block; 5. First silicone sealing ring; 6. First arc-shaped heat insulation pad; 7. Middle heat shield; 8. First arc-shaped limiting block; 9. Second arc-shaped guide block; 10. Second silicone sealing ring; 11. Second arc-shaped heat insulation pad; 12. Inner heat shield; 13. Second arc-shaped limiting block; 14. First protruding block; 15. Snap-fit ​​groove; 16. Second protruding block; 17. Insertion groove; 18. Fixing block; 19. Positive and negative lead screws; 20. First turntable; 21. First threaded sleeve; 22. Slide groove; 23. Snap-fit ​​block; 24. Auxiliary rod; 25. Threaded rod; 26. Second turntable; 27. Second threaded sleeve; 28. Insertion block; 29. ​​Roller. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example 1: Refer to Figure 1-5 This embodiment provides a heat-insulating device for a single-crystal silicon rod extraction cart, including an extraction cart body 1, a heat insulation structure, a fixing structure, and a positioning structure. The extraction cart body 1 has two grooves 2 on its top. An outer heat insulation cover 3 is placed on the top of the extraction cart body 1. The outer heat insulation cover 3 is semi-circular in shape and has a heat insulation structure inside. First protruding blocks 14 are symmetrically connected to the outer walls of the outer heat insulation cover 3, and each of the two outer walls of the first protruding blocks 14 has a snap-fit ​​groove 15. Fixing blocks 18 are fixedly connected to both outer walls of the extraction cart body 1. Fixing structures are provided inside the fixing blocks 18, and a positioning structure is provided at the top of the fixing blocks 18.

[0029] The heat insulation structure includes a first arc-shaped guide block 4, a first silicone sealing ring 5, a first arc-shaped heat insulation pad 6, a middle heat insulation cover 7, a first arc-shaped limiting block 8, a second arc-shaped guide block 9, a second silicone sealing ring 10, a second arc-shaped heat insulation pad 11, an inner heat insulation cover 12, and a second arc-shaped limiting block 13. The first arc-shaped guide block 4 is fixedly connected to the inner wall of the outer heat insulation cover 3. The middle heat insulation cover 7 is inserted into the outer heat insulation cover 3. The first arc-shaped limiting block 8 is fixedly connected to one end of the middle heat insulation cover 7, and the middle heat insulation cover 7 is located inside the first arc-shaped guide block 4.

[0030] The outer heat insulation cover 3 has a first through groove at its end that is adapted to the middle heat insulation cover 7, and a first silicone sealing ring 5 is fixedly connected in the first through groove. A first arc-shaped heat insulation pad 6 is fixedly connected at the end of the outer heat insulation cover 3. A second arc-shaped guide block 9 is fixedly connected on the inner side wall of the middle heat insulation cover 7. An inner heat insulation cover 12 is inserted into the middle heat insulation cover 7. A second arc-shaped limiting block 13 is fixedly connected to one end of the inner heat insulation cover 12, and the inner heat insulation cover 12 is located inside the second arc-shaped guide block 9. The middle heat insulation cover 7 has a second through groove at its end that is adapted to the inner heat insulation cover 12, and a second silicone sealing ring 10 is fixedly connected in the second through groove. A second arc-shaped heat insulation pad 11 is fixedly connected at the end of the middle heat insulation cover 7.

[0031] The outer heat insulation cover 3 consists of a silicone buffer layer, a ceramic fiber heat insulation layer, and a heat insulation composite layer from the outside to the inside. The silicone buffer layer is made of addition-type silicone with a Shore hardness of 60. The outer heat insulation cover 3, the middle heat insulation cover 7, and the inner heat insulation cover 12 are made of the same material.

[0032] In this implementation, the first arc-shaped guide block 4 on the inner wall of the outer heat shield 3 guides the movement of the middle heat shield 7. The first arc-shaped limiting block 8 at one end of the middle heat shield 7 prevents the middle heat shield 7 from completely sliding out of the outer heat shield 3. The second arc-shaped guide block 9 on the inner wall of the middle heat shield 7 guides the movement of the inner heat shield 12. The second arc-shaped limiting block 13 at one end of the inner heat shield 12 prevents the inner heat shield 12 from completely sliding out of the middle heat shield 7. Through this multi-section nested structure, the heat shield can be flexibly stretched or contracted. When stretched, it can completely cover the high-temperature single-crystal silicon rod, and when contracted, it is easy to store. The first silicone at the end of the outer heat shield 3... The sealing ring 5 and the first arc-shaped heat insulation pad 6, when the middle heat insulation cover 7 and the outer heat insulation cover 3 are in contact, play a role in sealing and heat insulation, preventing heat from escaping from the gap between them. The second silicone sealing ring 10 and the second arc-shaped heat insulation pad 11 at the end of the middle heat insulation cover 7, when the middle heat insulation cover 7 and the inner heat insulation cover 12 are in contact, also achieve sealing and heat insulation. At the same time, the outer heat insulation cover 3, the middle heat insulation cover 7 and the inner heat insulation cover 12 all adopt a structure of silicone buffer layer, ceramic fiber heat insulation layer and heat insulation composite layer from the outside to the inside. The ceramic fiber heat insulation layer is heat resistant to more than 800℃, the silicone buffer layer is heat resistant to 250℃, and the multi-layer structure together improves the heat insulation effect and stability.

[0033] Example 2: Refer to Figure 1-6 This embodiment is based on the previous embodiment, but differs from the previous embodiment in that the fixing structure includes a positive and negative lead screw 19, a first threaded sleeve 21, a sliding groove 22, and a snap-fit ​​block 23. The positive and negative lead screw 19 is rotatably connected inside the fixing block 18, and one end of the positive and negative lead screw 19 passes through the fixing block 18 and is fixedly connected to a first turntable 20. Two first threaded sleeves 21 are threadedly connected to the positive and negative lead screw 19, and a sliding groove 22 adapted to the first threaded sleeve 21 is opened at the top of the fixing block 18. The two first threaded sleeves 21 are fixedly connected to a snap-fit ​​block 23 adapted to the snap-fit ​​groove 15 at their close ends.

[0034] In use, rotating the first turntable 20 drives the positive and negative lead screws 19 to rotate. Since the two first threaded sleeves 21 connected to the positive and negative lead screws 19 are limited by the slide groove 22, they will move towards or away from each other along the positive and negative lead screws 19. When the two first threaded sleeves 21 approach each other, the locking block 23 at their ends will be inserted into the locking groove 15 on the first protruding block 14 on the outer side wall of the outer heat insulation cover 3, thereby fixing the outer heat insulation cover 3 to the crystal taking vehicle body 1 and preventing the high temperature area from being exposed due to the heat insulation cover loosening. When the two first threaded sleeves 21 move away from each other, the locking block 23 will exit from the locking groove 15 and the fixation will be released.

[0035] Example 3: Reference Figure 1-7This embodiment is based on the previous embodiment, but differs from the previous embodiment in that the positioning structure includes an auxiliary rod 24, a threaded rod 25, a second turntable 26, a second threaded sleeve 27, and a plug-in block 28. The top of the fixing block 18 is fixedly connected to the auxiliary rod 24, the top of the fixing block 18 is rotatably connected to the threaded rod 25, the top of the threaded rod 25 is fixedly connected to the second turntable 26, the threaded rod 25 is threadedly connected to the second threaded sleeve 27, and the bottom of the second threaded sleeve 27 is fixedly connected to the plug-in block 28.

[0036] Two second protruding blocks 16 are symmetrically connected on the outer wall of the inner heat insulation cover 12, and the top of the second protruding block 16 is provided with a plug groove 17 that is adapted to the plug block 28. Two rollers 29 are fixedly connected to the bottom of the inner heat insulation cover 12 away from the second arc-shaped limiting block 13, and the rollers 29 are slidably connected to the groove 2.

[0037] In this implementation, the outer heat shield 3 is first fixed to the crystal-retrieving vehicle body 1 using a fixing structure. Then, the inner heat shield 12 is pulled, allowing it to slide within the middle heat shield 7 and the outer heat shield 3 until it covers the entire length of the high-temperature single-crystal silicon rod. Next, the second turntable 26 is rotated to drive the threaded rod 25 to rotate. The second threaded sleeve 27 on the threaded rod 25 moves up and down along the auxiliary rod 24. When the inner heat shield 12 is stretched into place, rotating the second turntable 26 drives the second threaded sleeve 27 downwards, causing the bottom insertion block 28 to insert into the insertion groove 17 on the second protrusion 16 on the outer side wall of the inner heat shield 12, thereby extending the inner heat shield 12. The positioning function directly restricts the movement of the inner heat shield 12 along the extension direction. Even if the crystal removal vehicle is bumpy during transport, the heat shield will not retract or shift, ensuring the integrity of high-temperature protection. When retraction is required, the second threaded sleeve 27 is moved upward to allow the plug block 28 to exit from the plug slot 17. The roller 29 at the bottom of the inner heat shield 12 is slidably connected to the groove 2 at the top of the crystal removal vehicle body 1, facilitating the stretching and retraction of the inner heat shield 12. After use, the plug block 28 is removed from the plug slot 17, and then the inner heat shield 12 is pushed into the middle heat shield 7 and the outer heat shield 3 in sequence to retract. Finally, the outer heat shield 3 is released from the fixation by the fixing structure.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A heat-insulating device for preventing scalding on a single-crystal silicon rod extraction cart, comprising an extraction cart body (1), a heat-insulating structure, a fixing structure, and a positioning structure, characterized in that, The top of the crystal-removing vehicle (1) has two grooves (2). An outer heat shield (3) is placed on the top of the crystal-removing vehicle (1). The outer heat shield (3) is semi-circular in shape. The outer heat shield (3) has a heat insulation structure inside. A first protruding block (14) is symmetrically connected to the outer side wall of the outer heat shield (3). The first protruding block (14) has a snap-fit ​​groove (15) on both outer side walls. A fixing block (18) is fixedly connected to both outer side walls of the crystal-removing vehicle (1). The fixing block (18) has a fixing structure inside. The fixing block (18) has a positioning structure at the top.

2. The anti-scalding and heat-insulating device for a single-crystal silicon rod extraction cart according to claim 1, characterized in that, The heat insulation structure includes a first arc-shaped guide block (4), a first silicone sealing ring (5), a first arc-shaped heat insulation pad (6), a middle heat insulation cover (7), a first arc-shaped limiting block (8), a second arc-shaped guide block (9), a second silicone sealing ring (10), a second arc-shaped heat insulation pad (11), an inner heat insulation cover (12), and a second arc-shaped limiting block (13). The first arc-shaped guide block (4) is fixedly connected to the inner wall of the outer heat insulation cover (3). The middle heat insulation cover (7) is inserted into the outer heat insulation cover (3). The first arc-shaped limiting block (8) is fixedly connected to one end of the middle heat insulation cover (7), and the middle heat insulation cover (7) is located inside the first arc-shaped guide block (4).

3. The anti-scalding and heat-insulating device for a single-crystal silicon rod extraction cart according to claim 1, characterized in that, The outer heat shield (3) has a first through groove at its end that is compatible with the middle heat shield (7), and a first silicone sealing ring (5) is fixedly connected in the first through groove. A first arc-shaped heat insulation pad (6) is fixedly connected at the end of the outer heat shield (3). A second arc-shaped guide block (9) is fixedly connected on the inner side wall of the middle heat shield (7). An inner heat shield (12) is inserted into the middle heat shield (7).

4. The anti-scalding and heat-insulating device for a single-crystal silicon rod extraction cart according to claim 2, characterized in that, The inner heat insulation cover (12) is fixedly connected to a second arc-shaped limiting block (13) at one end, and the inner heat insulation cover (12) is located inside the second arc-shaped guide block (9). The middle heat insulation cover (7) has a second through groove that is compatible with the inner heat insulation cover (12) at the end, and a second silicone sealing ring (10) is fixedly connected in the second through groove. The middle heat insulation cover (7) has a second arc-shaped heat insulation pad (11) fixedly connected at the end.

5. The anti-scalding and heat-insulating device for a single-crystal silicon rod extraction cart according to claim 1, characterized in that, The outer heat shield (3) consists of a silicone buffer layer, a ceramic fiber heat insulation layer and a heat insulation composite layer from the outside to the inside. The silicone buffer layer is made of addition-type silicone with a Shore hardness of 60. The outer heat shield (3), the middle heat shield (7) and the inner heat shield (12) are made of the same material.

6. The anti-scalding and heat-insulating device for a single-crystal silicon rod extraction cart according to claim 1, characterized in that, The fixing structure includes a positive and negative screw (19), a first threaded sleeve (21), a slide groove (22), and a snap-fit ​​block (23). The positive and negative screw (19) is rotatably connected inside the fixing block (18), and one end of the positive and negative screw (19) passes through the fixing block (18) and is fixedly connected to a first turntable (20). Two first threaded sleeves (21) are threadedly connected to the positive and negative screw (19), and a slide groove (22) adapted to the first threaded sleeve (21) is opened at the top of the fixing block (18). The two first threaded sleeves (21) are fixedly connected to a snap-fit ​​block (23) adapted to the snap-fit ​​groove (15) at their closest ends.

7. The anti-scalding and heat-insulating device for a single-crystal silicon rod extraction cart according to claim 1, characterized in that, The positioning structure includes an auxiliary rod (24), a threaded rod (25), a second turntable (26), a second threaded sleeve (27), and a plug-in block (28). The top of the fixed block (18) is fixedly connected to the auxiliary rod (24), the top of the fixed block (18) is rotatably connected to the threaded rod (25), the top of the threaded rod (25) is fixedly connected to the second turntable (26), the threaded rod (25) is threadedly connected to the second threaded sleeve (27), and the bottom of the second threaded sleeve (27) is fixedly connected to the plug-in block (28).

8. The anti-scalding and heat-insulating device for a single-crystal silicon rod extraction cart according to claim 3, characterized in that, Two second protruding blocks (16) are symmetrically connected on the outer wall of the inner heat insulation cover (12), and the top of the second protruding block (16) is provided with a plug-in groove (17) that is compatible with the plug-in block (28).

9. A heat-insulating device for preventing scalding on a single-crystal silicon rod extraction cart according to claim 3, characterized in that, Two rollers (29) are fixedly connected to the bottom of the inner heat insulation cover (12) away from the second arc-shaped limiting block (13), and the rollers (29) are slidably connected to the groove (2).

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