Vacuum drying device for polycrystalline silicon rod

Abstract

The utility model provides a kind of vacuum drying device of polysilicon rod material, purpose is to solve the deep coral polysilicon rod material of poor material condition, after water explosion, cannot evaporate moisture in gap by using the heat accumulated itself technical problem.The vacuum drying device includes: conveying line;Multiple carriers, are detachably arranged on the conveying line;Vacuum box, is arranged on the conveying line, and the bottom of the vacuum box is open structure;Lifting assembly, is arranged below the conveying line and the vacuum box;Wherein, the bottom of the carrier has the cover body capable of covering the bottom of the vacuum box.Carrier is conveyed to the bottom of vacuum box after rod material after water explosion, then lifting assembly is lifted to vacuum box by carrier and rod material, and the boiling point of moisture is reduced by low pressure environment in vacuum box, so that the moisture in rod material is evaporated in the temperature environment of rod material, to realize the purpose of drying.

Description

Technical Field

[0001] This utility model relates to the technical field of polycrystalline silicon drying, and specifically to a vacuum drying device for polycrystalline silicon rods. Background Technology

[0002] Current water-quenching crushing technology mainly involves: cutting polycrystalline silicon rods to standard lengths, loading them into a water-quenching furnace in a triangular pattern, heating them to approximately 700 degrees Celsius, and then quickly immersing them in high-purity water at a temperature not exceeding 40 degrees Celsius after 10 seconds (crushing the polycrystalline silicon rods based on the principle of thermal expansion and contraction to obtain a high point ratio for high-value-added materials). The water is then rapidly removed within a certain process time limit, and the residual heat in the polycrystalline silicon rods is used to evaporate the surface moisture. Finally, the crushing and packaging process is completed.

[0003] The main technical drawbacks of the existing water quenching process are as follows: Due to the deep internal gaps of the deep coral polycrystalline silicon rods with poor material conditions, some of which have gaps equal to the diameter of the rod, if the water temperature is within the range of 90-130 degrees Celsius after heating and then entering the water quenching tank, the water cannot be evaporated from the internal gaps of the polycrystalline silicon rods by utilizing the heat stored within. This will result in water mist appearing inside the bag after the silicon material is broken due to the low temperature, making the product unqualified. Utility Model Content

[0004] To address the technical problem that deep coral polycrystalline silicon rods in poor condition cannot evaporate the moisture in the gaps after water blasting, this invention provides a vacuum drying device for polycrystalline silicon rods. The rods are fed into a vacuum chamber, and by reducing the air pressure, the boiling point of water decreases, thereby evaporating the moisture in the gaps using the heat stored in the rods themselves.

[0005] The technical solution of this utility model is:

[0006] A vacuum drying apparatus for polycrystalline silicon rods includes:

[0007] Conveyor line;

[0008] Multiple carriers can be detachably mounted on the conveyor line;

[0009] A vacuum chamber is located on the conveyor line, and the bottom of the vacuum chamber is an open structure;

[0010] A lifting assembly is located below the conveyor line and the vacuum chamber;

[0011] The carrier has a cover at its bottom that can cover the bottom of the vacuum chamber.

[0012] Optionally, the top of the carrier has multiple placement areas.

[0013] Optionally, the conveyor line includes a plurality of equally spaced drive rollers, on which all the carriers are placed equally spaced.

[0014] Optionally, the distance between two adjacent drive rollers is less than or equal to one-third of the width of the bottom surface of the carrier.

[0015] Optionally, the distance between two adjacent drive rollers is greater than the width of the lifting end of the lifting assembly.

[0016] Optionally, the top of the vacuum chamber is provided with a vacuum tube connector, and a vacuum pump is installed on the vacuum tube connector.

[0017] Optionally, two vacuum chambers and two lifting assemblies are arranged side by side on the conveyor line.

[0018] Optionally, the conveyor line has a double-layer structure with the upper and lower layers having opposite conveying directions, and the upper layer of the conveyor line is used to convey polycrystalline silicon rods.

[0019] Optionally, the lifting assembly includes a cylinder, which is vertically positioned below the conveyor line, with the piston rod of the cylinder pointing vertically upward.

[0020] Optionally, a sealing strip is provided on the open edge of the bottom of the vacuum chamber.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] The carrier transports the water-blasted bar stock to the bottom of the vacuum chamber. Then, the lifting assembly lifts the carrier and bar stock into the vacuum chamber. The low-pressure environment inside the vacuum chamber lowers the boiling point of the water, causing the water in the bar stock to evaporate in the temperature environment of the bar stock, thereby achieving the purpose of drying. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0028] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0029] Example:

[0030] See Figure 1 This embodiment discloses a vacuum drying device for polycrystalline silicon rods, including a conveyor line 10, a carrier 20, a vacuum chamber 40, and a lifting assembly 50. The carrier 20 is arranged on the conveyor line 10 and is used to transport the rod 30. The rod 30 is transported to the bottom of the vacuum chamber 40 by the carrier 20. Then, the lifting assembly 50 lifts the carrier 20 and puts the rod 30 into the vacuum chamber 40. The negative pressure environment of the vacuum chamber 40 lowers the boiling point of water and causes the residual water in the rod 30 to evaporate.

[0031] Specifically, the conveyor line 10 conveys bar stock 30 horizontally. Multiple carriers 20 are detachably mounted on the conveyor line 10, each carrier 20 capable of carrying 1-3 bar stock 30. A vacuum box 40 is positioned above the conveyor line 10, and the bottom of the vacuum box 40 is open. Furthermore, the bottom of each carrier 20 has a cover 22 that can cover the bottom of the vacuum box 40. This allows the cover 22 to completely close the open structure of the vacuum box 40 after the carriers 20 and bar stock 30 rise into the vacuum box 40, creating a sealed environment inside the vacuum box 40.

[0032] The lifting assembly 50 is located below the conveyor line 10 and the vacuum box 40. The top of the lifting assembly 50 is its lifting end. The lifting end of the lifting assembly 50 can lift the carrier 20 and send it into the vacuum box 40.

[0033] In this embodiment, the temperature of the bar stock 30 transported by the carrier 20 to the bottom of the vacuum chamber 40 is between 70-90°C. By reducing the air pressure around the bar stock 30, the boiling point of water is lowered to below 70°C, thereby enabling the moisture in the bar stock 30 to evaporate completely in the vacuum chamber 40, thus achieving the purpose of drying.

[0034] Preferably, the top of the carrier 20 is provided with multiple placement areas 21, and each placement area 21 can hold one bar stock 30. In this embodiment, the top of the carrier 20 has two downwardly recessed placement areas 21, so that three bar stocks 30 can be placed on the carrier 20, as shown in the specific placement method. Figure 1 As shown, they are arranged in a triangular structure.

[0035] In one specific embodiment:

[0036] The conveyor line 10 includes multiple drive rollers 11, all of which are arranged parallel to each other and are equally spaced. All carriers 20 are placed on the drive rollers 11 at equal intervals.

[0037] The end of the drive roller 11 is connected to a power source, which drives all the drive rollers 11 to rotate at the same speed and in the same direction.

[0038] During operation, the drive roller 11 on the conveyor line 10 transports the carrier 20 to below the vacuum box 40 and then stops for a certain period of time to allow sufficient time for the lifting assembly 50 to drive the carrier 20 and the bar stock 30 into the vacuum box 40, as well as to allow time for the vacuum box 40 to operate. Therefore, the drive roller 11 moves intermittently.

[0039] Generally, all drive rollers 11 are powered by sprockets and chains, and are driven to rotate by a motor.

[0040] Preferably, in order to avoid the carrier 20 tipping over on the drive rollers 11, the distance between two adjacent drive rollers 11 is set to be less than one-third of the bottom width of the carrier 20, so as to ensure that at least two drive rollers 11 support the bottom of the carrier 20, thereby keeping the carrier 20 stable, wherein the width direction of the bottom surface of the carrier 20 is the direction of movement of the carrier 20.

[0041] In addition, to avoid the gap between the two drive rollers 11 being too small, resulting in no room for movement at the lifting end of the lifting assembly 50, the gap between two adjacent drive rollers 11 is set to be greater than the width of the lifting end of the lifting assembly 50.

[0042] In another specific embodiment:

[0043] The top of the vacuum chamber 40 is provided with a vacuum tube connector 41, through which a vacuum tube is connected and connected to a vacuum pump (not shown in the figure). During operation, the vacuum pump changes the gas pressure inside the vacuum chamber 40 and can also suck away the vapor that has evaporated into the vacuum chamber 40.

[0044] In another specific embodiment:

[0045] To improve work efficiency, two vacuum boxes 40 and two lifting components 50 are arranged side by side on the conveyor line 10.

[0046] In another specific embodiment:

[0047] The conveyor line 10 has a double-layer structure with the upper and lower layers having opposite conveying directions. The upper layer of the conveyor line 10 is used to convey the carrier 20 carrying the polycrystalline silicon rod 30, and the lower layer of the conveyor line 10 is used to convey the carrier 20 after unloading the polycrystalline silicon rod 30.

[0048] By setting the conveyor line 10 to a double-layer structure, the carrier 20 can be transported in a cyclical manner, avoiding manual handling of the carrier 20.

[0049] In another specific embodiment:

[0050] The lifting assembly 50 includes a cylinder, which is vertically positioned below the conveyor line 10. The piston rod of the cylinder is vertically upward and can pass through two adjacent drive rollers 11 and contact the bottom of the carrier 20. As the piston rod rises, it lifts the carrier 20 and the bar stock 30 into the vacuum box 40.

[0051] In this embodiment, multiple synchronously moving cylinders can be provided, acting simultaneously on the bottom of the carrier 20 to ensure that the carrier 20 remains stable during ascent or descent. Alternatively, multiple support points can be provided at the end of the piston rod of a single cylinder, driving the carrier 20 to move up and down via these support points.

[0052] In another specific embodiment:

[0053] A sealing strip is provided on the open edge of the bottom of the vacuum chamber 40, so that when the carrier 20 and the bar stock 30 enter the vacuum chamber 40, the cover 22 at the bottom of the carrier 20 can cover the sealing strip at the bottom of the vacuum chamber 40 to avoid the problem of pressure leakage in the vacuum chamber 40.

[0054] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A vacuum drying apparatus for polycrystalline silicon rods, characterized in that, include: Conveyor line; Multiple carriers can be detachably mounted on the conveyor line; A vacuum chamber is located on the conveyor line, and the bottom of the vacuum chamber is an open structure; A lifting assembly is located below the conveyor line and the vacuum chamber; The carrier has a cover at its bottom that can cover the bottom of the vacuum chamber.

2. The vacuum drying apparatus for polycrystalline silicon rods according to claim 1, characterized in that, The top of the carrier has multiple placement areas.

3. The vacuum drying apparatus for polycrystalline silicon rods according to claim 1, characterized in that, The conveyor line includes multiple equally spaced drive rollers, and all the carriers are placed equally spaced on the drive rollers.

4. The vacuum drying apparatus for polycrystalline silicon rods according to claim 3, characterized in that, The distance between two adjacent drive rollers is less than or equal to one-third of the width of the bottom surface of the carrier.

5. The vacuum drying apparatus for polycrystalline silicon rods according to claim 3, characterized in that, The distance between two adjacent transmission rollers is greater than the width of the lifting end of the lifting assembly.

6. The vacuum drying apparatus for polycrystalline silicon rods according to claim 1, characterized in that, The top of the vacuum chamber is equipped with a vacuum tube connector, and a vacuum pump is installed on the vacuum tube connector.

7. The vacuum drying apparatus for polycrystalline silicon rods according to claim 1, characterized in that, The conveyor line is provided with two vacuum boxes and two lifting assemblies arranged in parallel.

8. The vacuum drying apparatus for polycrystalline silicon rods according to claim 1, characterized in that, The conveyor line has a double-layer structure with the upper and lower layers conveying in opposite directions. The upper layer of the conveyor line is used to convey polycrystalline silicon rods.

9. The vacuum drying apparatus for polycrystalline silicon rods according to claim 1, characterized in that, The lifting assembly includes a cylinder, which is vertically positioned below the conveyor line, with the piston rod of the cylinder pointing vertically upwards.

10. The vacuum drying apparatus for polycrystalline silicon rods according to claim 1, characterized in that, A sealing strip is provided on the open edge of the bottom of the vacuum chamber.

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