Leakage-proof device for conveying polycrystalline silicon

Abstract

The invention relates to the field of polycrystalline silicon conveying, in particular to a leakage-proof device for polycrystalline silicon conveying. According to an existing conveying device, when leakage occurs, nitrogen can drive silicon powder in a pipeline to be sprayed into air, the surface of the silicon powder is oxidized, and the sprayed silicon powder is inconvenient to clean and collect. The invention discloses a leakage-proof device for conveying polycrystalline silicon. The leakage-proof device comprises a conveying pipeline and the like, an upper cover is placed at the joint of the two conveying pipelines, two first air pressure cavities are formed in the upper cover, a lower cover is connected to the bottom of the upper cover through bolts, two second air pressure cavities are formed in the lower cover, a cavity is formed between the upper cover and the lower cover, and the lower cover makes contact with the two conveying pipelines. When leakage occurs, silicon powder leaked from the joint of the two conveying pipelines can be collected, so that the situation that the silicon powder is sprayed into air along with nitrogen to be oxidized can be prevented, and the purpose of carrying out leakage-proof protection on polycrystalline silicon in the conveying process is achieved.

Description

Technical Field

[0001] The present invention relates to the field of polysilicon transportation, and particularly to a leak-proof device for polysilicon transportation. Background Art

[0002] Polysilicon is an important semiconductor material and is widely used in fields such as solar cells and integrated circuits. During the production and processing of polysilicon, transportation is a key link. Currently, the common pneumatic transportation of polysilicon fully mixes the material with nitrogen in a silo pump and then pressurizes and transports the polysilicon powder through multiple pipeline connections, which is the main transportation method of positive pressure dense-phase pneumatic transportation at present.

[0003] However, the current transportation device is prone to gaps at the connection between two adjacent pipelines after long-term use, resulting in nitrogen leakage. As the nitrogen leaks and sprays out, the nitrogen will drive the silicon powder in the pipeline to spray into the air, causing the surface oxidation of the silicon powder, affecting the activity of the silicon powder, and the sprayed silicon powder is relatively dispersed, making it inconvenient to clean and collect the sprayed silicon powder. Summary of the Invention

[0004] Aiming at the above-mentioned disadvantages or deficiencies of the prior art, the present invention provides a leak-proof device for polysilicon transportation, which can prevent the silicon powder from being sprayed into the air with nitrogen for oxidation and can also collect the silicon powder more conveniently.

[0005] A leak-proof device for polysilicon transportation includes a transportation pipeline. An upper cover is placed at the connection of the two transportation pipelines. Two pressure chambers one are opened on the upper cover. The bottom of the upper cover is connected to a lower cover by bolts. Two pressure chambers two are opened on the lower cover. A cavity is formed between the upper cover and the lower cover. The lower cover is in contact with both of the two transportation pipelines. The connection of the two transportation pipelines is located between the upper cover and the lower cover. A pressure probe is fixedly connected to the top of the upper cover, and the pressure probe passes through the upper cover. A sealing component is provided between the upper cover and the lower cover, and the sealing component is used to enhance the sealing performance between the upper cover and the lower cover and the two transportation pipelines. A pressure relief and temporary storage component is provided on the lower cover, and the pressure relief and temporary storage component is used to relieve the pressure in the cavity between the upper cover and the lower cover and temporarily store the silicon powder.

[0006] As a preferred technical solution of the present invention, the sealing member includes a pressing plate. Two pressing plates are slidably connected to the two air pressure chambers I of the upper cover and the two air pressure chambers II of the lower cover. The four pressing plates are all located in the cavity between the upper cover and the lower cover. Two air ducts are fixedly connected to the upper cover and the lower cover respectively. The four air ducts are respectively communicated with the two air pressure chambers I of the upper cover and the two air pressure chambers II of the lower cover. Air bags are fixedly connected to the four air ducts. The air ducts are communicated with the air bags. Two air bags are in a group. The two conveying pipelines are respectively in contact with the two groups of air bags.

[0007] As a preferred technical solution of the present invention, the pressure relief and temporary storage member includes a temporary storage cylinder. The temporary storage cylinder is threadedly connected to the bottom of the lower cover. A material passing port is opened at the top of the temporary storage cylinder. The temporary storage cylinder is communicated with the cavity between the upper cover and the lower cover. A pressure relief ball valve is fixedly connected to the lower part of the outer wall of the temporary storage cylinder. The pressure relief ball valve is communicated with the temporary storage cylinder. Two sliding mounting frames are fixedly connected to the top of the inner wall of the temporary storage cylinder. The two sliding mounting frames are symmetrically arranged. A sealing plate is slidably connected between the two sliding mounting frames. The sealing plate is located below the material passing port on the temporary storage cylinder. A return spring is connected between the sealing plate and the two sliding mounting frames. The return spring is located in the sliding mounting frame. A pressing rod is slidably connected to the temporary storage cylinder. The pressing rod is fixedly connected to the sealing plate.

[0008] As a preferred technical solution of the present invention, a sweeping member is further included. The sweeping member is arranged on the lower cover. The sweeping member includes a motor. The motor is fixedly connected to the outer wall of the lower cover. The pressure probe is electrically connected to the motor. The output shaft of the motor passes through the lower cover. A main gear is fixedly connected to the output shaft of the motor. The main gear is located in the cavity between the upper cover and the lower cover. A main gear ring is rotatably connected to one of the conveying pipelines. The main gear meshes with the main gear ring. The main gear ring is located in the cavity between the upper cover and the lower cover. A circular plate is fixedly connected to one of the conveying pipelines. The circular plate is located in the cavity between the upper cover and the lower cover. A transmission ring is rotatably connected to the circular plate. Two brush rods are fixedly connected to the transmission ring. The two brush rods are symmetrically arranged. The main gear ring is fixedly connected to the two brush rods.

[0009] As a preferred technical solution of the present invention, it further includes a clamping component, the clamping component is arranged on the main gear ring, the clamping component includes a driven gear ring, the driven gear ring is fixedly connected to the main gear ring, six rotating mounting brackets are fixedly connected to the side of the transmission ring away from the driven gear ring, clamping rods are rotatably connected to the six rotating mounting brackets, six threaded rods are threadedly connected to the driven gear ring, auxiliary gears are fixedly connected to the sides of the six threaded rods close to the main gear ring, the driven gear ring meshes with the six auxiliary gears, and pressing rings are fixedly connected to the sides of the six threaded rods away from the main gear ring.

[0010] As a preferred technical solution of the present invention, extrusion inclined surfaces are provided on the six pressing rings, and the extrusion inclined surfaces on the six pressing rings are respectively in contact with the six clamping rods.

[0011] As a preferred technical solution of the present invention, it further includes a sealing ring, and the sealing ring is fixedly connected to the six threaded rods.

[0012] As a preferred technical solution of the present invention, the sealing ring is made of rubber material.

[0013] The beneficial effects of the present invention: When there is a leak at the interface of the two conveying pipelines, nitrogen and silicon powder in the conveying pipelines will enter the cavity between the upper cover and the lower cover, increasing the pressure in the cavity between the upper cover and the lower cover. All four airbags will expand to further seal the contact positions between the upper cover and the lower cover and the two conveying pipelines. As the leak at the interface of the two conveying pipelines continues, the sealing plate no longer blocks the material passing port on the temporary storage cylinder, and the nitrogen and silicon powder in the cavity between the upper cover and the lower cover will enter the temporary storage cylinder. The pressure probe will detect the air pressure in the cavity between the upper cover and the lower cover. Thus, when there is a leak at the interface of the two conveying pipelines, the silicon powder leaked from the two conveying pipeline interfaces can be collected, preventing the silicon powder from being sprayed into the air with nitrogen and oxidized, and further achieving the purpose of preventing leakage of polysilicon during transportation.

[0014] When the pressure value displayed on the pressure probe is relatively large, the pressure probe will start the motor through the circuit, and the motor will drive the two brush rods to brush off the silicon powder adhering to the inner walls of the upper cover and the lower cover. When the pressure value displayed on the pressure probe is normal, the pressure probe will turn off the motor through the circuit. Thus, by driving the two brush rods to rotate through the transmission ring, the silicon powder adhering to the inner walls of the upper cover and the lower cover can be brushed off, facilitating the collection of silicon powder.

[0015] When the main gear drives the main gear ring to rotate, the six pressing rings will respectively push the six clamping rods to swing, and the six clamping rods will jointly press one of the conveying pipelines, reducing the gap at the interface of the two conveying pipelines, thereby reducing the leakage amount at the interface of the two conveying pipelines. Brief Description of the Drawings

[0016] Figure 1 This is the first three-dimensional structure schematic diagram of the present invention.

[0017] Figure 2 This is the second three-dimensional structure schematic diagram of the present invention.

[0018] Figure 3 This is the three-dimensional structure schematic diagram of the sealing component of the present invention.

[0019] Figure 4 This is the disassembled three-dimensional structure schematic diagram of the sealing component of the present invention.

[0020] Figure 5 This is the partially sectional three-dimensional structure schematic diagram of the pressure relief and temporary storage component of the present invention.

[0021] Figure 6 This is the partially sectional three-dimensional structure schematic diagram of the present invention.

[0022] Figure 7 This is the partially sectional three-dimensional structure schematic diagram of the sweeping component of the present invention.

[0023] Figure 8 This is the partially three-dimensional structure schematic diagram of the sweeping component and the clamping component of the present invention.

[0024] Figure 9 In the present invention Figure 8 The enlarged three-dimensional structure schematic diagram of A.

[0025] Figure 10 This is the partially disassembled three-dimensional structure schematic diagram of the clamping component of the present invention.

[0026] Figure 11 This is the partially three-dimensional structure schematic diagram of the clamping component of the present invention.

[0027] In the reference numerals: 11: conveying pipeline, 1: upper cover, 2: lower cover, 3: pressure probe, 41: pressing plate, 42: air guide pipe, 43: airbag, 51: temporary storage cylinder, 52: pressure relief ball valve, 53: sliding mounting frame, 54: sealing plate, 55: return spring, 56: pressing rod, 61: motor, 62: main gear, 63: main gear ring, 64: circular plate, 65: transmission ring, 66: brush rod, 71: driven gear ring, 72: rotating mounting frame, 73: clamping rod, 74: threaded rod, 75: auxiliary gear, 76: extrusion ring, 8: sealing ring. Detailed Description of the Invention

[0028] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the descriptions in the specification and the attached drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, welding, and pasting that are mature in the prior art, and will not be elaborated here.

[0029] Embodiment 1: A leak-proof device for polysilicon transportation, as Figures 1 - 6 shown, including a transportation pipeline 11. An upper cover 1 is placed at the connection of the two transportation pipelines 11. Two air pressure chambers I are opened on the upper cover 1. The bottom of the upper cover 1 is connected to a lower cover 2 by bolts. The upper cover 1 and the lower cover 2 are used to jointly seal the connection of the two transportation pipelines 11. Two air pressure chambers II are opened on the lower cover 2. A cavity is formed between the upper cover 1 and the lower cover 2. The lower cover 2 is in contact with both of the two transportation pipelines 11. The connection of the two transportation pipelines 11 is located between the upper cover 1 and the lower cover 2. A pressure probe 3 is connected to the top of the upper cover 1 by bolts. The pressure probe 3 is used to detect the pressure in the cavity between the upper cover 1 and the lower cover 2. The pressure probe 3 passes through the upper cover 1. A sealing component is provided between the upper cover 1 and the lower cover 2. The sealing component is used to enhance the sealing performance between the upper cover 1 and the lower cover 2 and the two transportation pipelines 11. A pressure relief and temporary storage component is provided on the lower cover 2. The pressure relief and temporary storage component is used to relieve the pressure in the cavity between the upper cover 1 and the lower cover 2 and temporarily store silicon powder.

[0030] The sealing component includes a pressing plate 41. Two pressing plates 41 are slidably connected to the two air pressure chambers I of the upper cover 1 and the two air pressure chambers II of the lower cover 2. All four pressing plates 41 are located in the cavity between the upper cover 1 and the lower cover 2. Two air guide pipes 42 are connected to the upper cover 1 and the lower cover 2 by bolts respectively. The four air guide pipes 42 are respectively communicated with the two air pressure chambers I of the upper cover 1 and the two air pressure chambers II of the lower cover 2. Air bags 43 are fixedly connected to the four air guide pipes 42. The air bags 43 are made of rubber material. The air bags 43 are used to enhance the sealing performance between the upper cover 1 and the lower cover 2 and the two transportation pipelines 11. The air guide pipes 42 are communicated with the air bags 43. Two air bags 43 form a group. The two transportation pipelines 11 are respectively in contact with the two groups of air bags 43.

[0031] The pressure relief and temporary storage component includes a temporary storage cylinder 51. The bottom of the lower cover 2 is threadedly connected to the temporary storage cylinder 51. A material inlet is opened at the top of the temporary storage cylinder 51. The material inlet on the temporary storage cylinder 51 is used for discharging silicon powder. The temporary storage cylinder 51 communicates with the cavity between the upper cover 1 and the lower cover 2. A pressure relief ball valve 52 is connected to the lower part of the outer wall of the temporary storage cylinder 51 through a flange. The pressure relief ball valve 52 communicates with the temporary storage cylinder 51. Two sliding mounting frames 53 are welded to the top of the inner wall of the temporary storage cylinder 51. The two sliding mounting frames 53 are symmetrically arranged. A sealing plate 54 is slidably connected between the two sliding mounting frames 53. The sealing plate 54 is used to block the material inlet on the temporary storage cylinder 51. The sealing plate 54 is located below the material inlet on the temporary storage cylinder 51. A return spring 55 is connected to the sealing plate 54 and the two sliding mounting frames 53 through hooks. The return spring 55 is located inside the sliding mounting frame 53. A pressure rod 56 is slidably connected to the temporary storage cylinder 51. The pressure rod 56 is fixedly connected to the sealing plate 54.

[0032] At first, the sealing plate 54 blocks the material passing port on the temporary storage cylinder 51. When there is a leak at the interface of the two conveying pipelines 11, the nitrogen gas and silicon powder in the conveying pipeline 11 will enter the cavity between the upper cover 1 and the lower cover 2, increasing the pressure in the cavity between the upper cover 1 and the lower cover 2. Under the action of the pressure, the two groups of pressing plates 41 will move away from each other. The four pressing plates 41 will respectively push the air in the two air pressure chambers - of the upper cover 1 and the two air pressure chambers II of the lower cover 2 into the four air bags 43 through the four air guide pipes 42. The four air bags 43 will all expand to further seal the contact positions between the upper cover 1 and the lower cover 2 and the two conveying pipelines 11. As the leak at the interface of the two conveying pipelines 11 continues, the sealing plate 54 will move downward under the action of the pressure, and the return spring 55 will be stretched, causing the sealing plate 54 to no longer block the material passing port on the temporary storage cylinder 51. The nitrogen gas and silicon powder in the cavity between the upper cover 1 and the lower cover 2 will enter the temporary storage cylinder 51. The downward movement of the sealing plate 54 will drive the pressure rod 56 to move downward. The pressure probe 3 will detect the air pressure in the cavity between the upper cover 1 and the lower cover 2. Before repairing the interface of the two conveying pipelines 11, the staff will observe the pressure value on the pressure probe 3. When the pressure value displayed on the pressure probe 3 is relatively large, the staff will connect the collection container to the pressure relief ball valve 52, press the pressure rod 56, and at the same time open the pressure relief ball valve 52, so that the nitrogen gas and part of the silicon powder in the temporary storage cylinder 51 will enter the collection container, thereby relieving the pressure of the temporary storage cylinder 51 and the cavity between the upper cover 1 and the lower cover 2. Then the staff will release the pressure rod 56, and the return spring 55 will reset. The reset of the return spring 55 will drive the sealing plate 54 to move upward and reset. The upward movement and reset of the sealing plate 54 will drive the pressure rod 56 to move upward and reset. At the same time, the staff will close the pressure relief ball valve 52. Then the staff will remove the upper cover 1 and the lower cover 2 to repair the interface of the two conveying pipelines 11. After repairing the interface of the two conveying pipelines 11, the staff will reinstall the upper cover 1 and the lower cover 2 to the interface of the two conveying pipelines 11. Immediately afterwards, the staff will remove the temporary storage cylinder 51, clean and collect the silicon powder in the temporary storage cylinder 51, and reinstall the cleaned temporary storage cylinder 51 to the bottom of the lower cover 2. In this way, when there is a leak at the interface of the two conveying pipelines 11, the silicon powder leaked from the interface of the two conveying pipelines 11 can be collected, thereby preventing the silicon powder from being sprayed into the air with nitrogen gas and oxidized, and further achieving the purpose of preventing leakage of polysilicon during the conveying process.

[0033] Embodiment 2: On the basis of Embodiment 1, as Figure 7 and Figure 8As shown, it further includes a sweeping component. The sweeping component is arranged on the lower cover 2. The sweeping component includes a motor 61. The outer wall of the lower cover 2 is bolted with the motor 61. The pressure probe 3 is electrically connected to the motor 61. The output shaft of the motor 61 passes through the lower cover 2. A main gear 62 is connected to the output shaft of the motor 61 by a flat key. The main gear 62 is located in the cavity between the upper cover 1 and the lower cover 2. A main gear ring 63 is rotatably connected to one of the conveying pipes 11. The main gear 62 meshes with the main gear ring 63. The main gear ring 63 is located in the cavity between the upper cover 1 and the lower cover 2. A circular plate 64 is bolted to one of the conveying pipes 11. The circular plate 64 is located in the cavity between the upper cover 1 and the lower cover 2. A transmission ring 65 is rotatably connected to the circular plate 64. Two brush rods 66 are bolted to the transmission ring 65. The two brush rods 66 are used to brush off the silicon powder adhering to the inner walls of the upper cover 1 and the lower cover 2. The two brush rods 66 are symmetrically arranged. The main gear ring 63 is fixedly connected to the two brush rods 66.

[0034] When the pressure value displayed on the pressure probe 3 is relatively large, the pressure probe 3 will start the motor 61 through the circuit. The output shaft of the motor 61 will drive the main gear 62 to rotate. The rotation of the main gear 62 will drive the main gear ring 63 to rotate. The rotation of the main gear ring 63 will drive the transmission ring 65 to rotate. The rotation of the transmission ring 65 will drive the two brush rods 66 to rotate around the interfaces of the two conveying pipes 11. The rotation of the two brush rods 66 will brush off the silicon powder adhering to the inner walls of the upper cover 1 and the lower cover 2. When the pressure value displayed on the pressure probe 3 is normal, the pressure probe 3 will turn off the motor 61 through the circuit. In this way, driving the two brush rods 66 to rotate through the transmission ring 65 can brush off the silicon powder adhering to the inner walls of the upper cover 1 and the lower cover 2, so as to collect the silicon powder more conveniently.

[0035] Embodiment 3: On the basis of Embodiment 2, as Figures 8 - 11As shown in the figure, it further includes a clamping component. The clamping component is arranged on the main gear ring 63. The clamping component includes a driven gear ring 71. The driven gear ring 71 is connected to the main gear ring 63 by bolts. On the side of the transmission ring 65 away from the driven gear ring 71, six rotating mounting brackets 72 are welded. A clamping rod 73 is rotatably connected to each of the six rotating mounting brackets 72. The clamping rod 73 is used to squeeze one of the conveying pipelines 11. Six threaded rods 74 are connected to the driven gear ring 71 by threads. On the side of the six threaded rods 74 close to the main gear ring 63, a secondary gear 75 is connected by a flat key. The driven gear ring 71 meshes with the six secondary gears 75. On the side of the six threaded rods 74 away from the main gear ring 63, an extrusion ring 76 is welded. An extrusion inclined surface is provided on each of the six extrusion rings 76. The extrusion inclined surfaces on the six extrusion rings 76 are respectively in contact with the six clamping rods 73.

[0036] When the main gear 62 drives the main gear ring 63 to rotate, the main gear ring 63 will drive the driven gear ring 71 to rotate. The rotation of the driven gear ring 71 will drive the six threaded rods 74 to rotate. During the rotation of the threaded rods 74, they will move horizontally under the action of the threads. The horizontal movement of the six threaded rods 74 will respectively drive the six extrusion rings 76 to move horizontally. The six extrusion rings 76 will respectively push the six clamping rods 73 to swing. The six clamping rods 73 will jointly squeeze one of the conveying pipelines 11 to move towards the direction close to the other conveying pipeline 11, so as to reduce the gap at the interface of the two conveying pipelines 11, thereby reducing the leakage amount at the interface of the two conveying pipelines 11. When the staff completes the maintenance of the interface of the two conveying pipelines 11, the staff will turn the six threaded rods 74 to rotate in the reverse direction. During the reverse rotation of the threaded rods 74, they will move horizontally in the reverse direction and reset under the action of the threads. The reset of the six threaded rods 74 will respectively drive the six extrusion rings 76 to move horizontally in the reverse direction and reset. The six extrusion rings 76 will no longer squeeze the six clamping rods 73, and the six clamping rods 73 will swing in the reverse direction and reset under the action of gravity.

[0037] Embodiment 4: On the basis of Embodiment 3, as Figure 11 shown, it further includes a sealing ring 8. The sealing ring 8 is fixedly connected to each of the six threaded rods 74. The sealing ring 8 is used to enhance the sealing performance between the circular plate 64 and the six threaded rods 74.

[0038] When the six threaded rods 74 move horizontally under the action of the threads, the six threaded rods 74 will respectively drive the six extrusion rings 76 to move horizontally. The extrusion ring 76 will seal the gap between the circular plate 64 and the six threaded rods 74, thereby preventing the silicon powder from leaking out through the gap between the circular plate 64 and the six threaded rods 74.

[0039] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A leak-proof device for polysilicon transportation, characterized in that It includes a conveying pipeline (11). An upper cover (1) is placed at the connection of the two conveying pipelines (11). Two air pressure chambers I are opened on the upper cover (1). The bottom of the upper cover (1) is connected to a lower cover (2) by bolts. Two air pressure chambers II are opened on the lower cover (2). A cavity is formed between the upper cover (1) and the lower cover (2). The lower cover (2) is in contact with both of the two conveying pipelines (11). The connection of the two conveying pipelines (11) is located between the upper cover (1) and the lower cover (2). A pressure probe (3) is fixedly connected to the top of the upper cover (1). The pressure probe (3) penetrates through the upper cover (1). A sealing component is provided between the upper cover (1) and the lower cover (2). The sealing component is used to enhance the sealing performance between the upper cover (1) and the lower cover (2) and the two conveying pipelines (11). A pressure relief and temporary storage component is provided on the lower cover (2). The pressure relief and temporary storage component is used to relieve the pressure in the cavity between the upper cover (1) and the lower cover (2) and temporarily store silicon powder.

2. The anti-leakage device for polysilicon transportation according to claim 1, characterized in that, The sealing component includes a pressing plate (41). Two of the pressing plates (41) are slidably connected to the two air pressure chambers I of the upper cover (1) and the two air pressure chambers II of the lower cover (2). All four pressing plates (41) are located in the cavity between the upper cover (1) and the lower cover (2). Two air guide pipes (42) are fixedly connected to both the upper cover (1) and the lower cover (2). The four air guide pipes (42) are respectively communicated with the two air pressure chambers I of the upper cover (1) and the two air pressure chambers II of the lower cover (2). Air bags (43) are fixedly connected to the four air guide pipes (42). The air guide pipes (42) are communicated with the air bags (43). Two of the air bags (43) form a group. The two conveying pipelines (11) are respectively in contact with the two groups of air bags (43).

3. The anti-leakage device for polysilicon transportation according to claim 1, characterized in that The pressure relief and temporary storage component includes a temporary storage cylinder (51). The temporary storage cylinder (51) is connected to the bottom of the lower cover (2) by threads. A material passing port is opened at the top of the temporary storage cylinder (51). The temporary storage cylinder (51) is communicated with the cavity between the upper cover (1) and the lower cover (2). A pressure relief ball valve (52) is fixedly connected to the lower part of the outer wall of the temporary storage cylinder (51). The pressure relief ball valve (52) is communicated with the temporary storage cylinder (51). Two sliding mounting frames (53) are fixedly connected to the top of the inner wall of the temporary storage cylinder (51). The two sliding mounting frames (53) are symmetrically arranged. A sealing plate (54) is slidably connected between the two sliding mounting frames (53). The sealing plate (54) is located below the material passing port on the temporary storage cylinder (51). A return spring (55) is connected between the sealing plate (54) and the two sliding mounting frames (53). The return spring (55) is located inside the sliding mounting frame (53). A pressure rod (56) is slidably connected to the temporary storage cylinder (51). The pressure rod (56) is fixedly connected to the sealing plate (54).

4. A leakage prevention device for polysilicon transportation according to claim 1, characterized in that, It further includes a sweeping component. The sweeping component is arranged on the lower cover (2). The sweeping component includes a motor (61). The outer wall of the lower cover (2) is fixedly connected with the motor (61). The pressure probe (3) is electrically connected with the motor (61). The output shaft of the motor (61) passes through the lower cover (2). A main gear (62) is fixedly connected to the output shaft of the motor (61). The main gear (62) is located in the cavity between the upper cover (1) and the lower cover (2). A main gear ring (63) is rotatably connected to one of the conveying pipes (11). The main gear (62) meshes with the main gear ring (63). The main gear ring (63) is located in the cavity between the upper cover (1) and the lower cover (2). A circular plate (64) is fixedly connected to one of the conveying pipes (11). The circular plate (64) is located in the cavity between the upper cover (1) and the lower cover (2). A transmission ring (65) is rotatably connected to the circular plate (64). Two brush rods (66) are fixedly connected to the transmission ring (65). The two brush rods (66) are symmetrically arranged. The main gear ring (63) is fixedly connected to both of the two brush rods (66).

5. The leak-proof device for polysilicon transportation according to claim 4, characterized in that, It further includes a clamping component. The clamping component is arranged on the main gear ring (63). The clamping component includes a driven gear ring (71). The driven gear ring (71) is fixedly connected to the main gear ring (63). Six rotating mounting brackets (72) are fixedly connected to the side of the transmission ring (65) away from the driven gear ring (71). Clamping rods (73) are rotatably connected to all of the six rotating mounting brackets (72). Six threaded rods (74) are threadedly connected to the driven gear ring (71). A secondary gear (75) is fixedly connected to the side of each of the six threaded rods (74) close to the main gear ring (63). The driven gear ring (71) meshes with all of the six secondary gears (75). An extrusion ring (76) is fixedly connected to the side of each of the six threaded rods (74) away from the main gear ring (63).

6. The leak-proof device for polysilicon transportation according to claim 5, characterized in that, An extrusion inclined surface is provided on each of the six extrusion rings (76). The extrusion inclined surfaces on the six extrusion rings (76) are respectively in contact with the six clamping rods (73).

7. The leak-proof device for polysilicon transportation according to claim 5, characterized in that, It further includes a sealing ring (8). The sealing ring (8) is fixedly connected to all of the six threaded rods (74).

8. The anti-leakage device for polysilicon transportation according to claim 7, characterized in that, The sealing ring (8) is made of rubber material.

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