Charging barrel capable of preventing silicon material pollution and monocrystalline silicon production equipment

Abstract

The utility model provides a charging barrel capable of preventing silicon material pollution and monocrystalline silicon production equipment, the charging barrel comprises a barrel cover, a barrel body and a sheath which are detachably connected, the barrel body is arranged in a through manner and comprises a first end and a second end which are oppositely arranged, one end connected with the barrel cover is defined as the first end, and the other end is defined as the second end; the sheath detachably sleeves the first end of the cylinder body and is used for abutting against the cylinder cover; and due to the arrangement of the sheath, collision friction is greatly reduced, and a quartz fragment generation source is fundamentally eliminated. The sheath can effectively absorb collision energy and block external pollutants, and the oxygen content index of the silicon material is remarkably reduced. As the sheath is detachably connected to the first end of the cylinder body, even if the sheath is damaged, the sheath can be conveniently replaced, the maintenance period is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This application relates to the field of monocrystalline silicon production equipment technology, and in particular to a feeding cylinder and monocrystalline silicon production equipment for preventing silicon material contamination. Background Technology

[0002] The iterative advancements in photovoltaic technology have led to a surge in demand for monocrystalline silicon, giving rise to RCZ (Repeated Czochralski) technology. RCZ technology involves pulling a single ingot in a monocrystalline furnace without dismantling the thermal field. Instead, polycrystalline silicon material is added to the thermal field via a quartz feeding cylinder, and the process is repeated by rotating a secondary chamber to further increase the yield of monocrystalline silicon.

[0003] However, in the application of RCZ technology, specifically in the process of feeding, transferring, and refilling the feeding cylinder, the collision between the cylinder cover and the upper edge of the cylinder body is unavoidable. This can lead to damage to the quartz feeding cylinder, resulting in some quartz fragments or residues entering the silicon material inside the feeding cylinder or falling into the molten silicon from the outside. This situation can lead to an increase in the oxygen content of the pulled monocrystalline silicon rods, or even prevent crystal formation, seriously affecting the finished product quality and efficiency of the monocrystalline silicon rods.

[0004] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Utility Model Content

[0005] This application provides a feeding cylinder and monocrystalline silicon production equipment to prevent silicon material contamination. This addresses the problem of existing feeding cylinders where the cylinder cover collides with the upper edge of the cylinder, causing damage to the quartz feeding cylinder. This damage results in some quartz fragments or residue entering the silicon material inside the feeding cylinder or falling into the molten silicon from the outside. Such situations can range from increasing the oxygen content of the pulled monocrystalline silicon rods to preventing crystal formation altogether, severely impacting the quality and efficiency of the finished monocrystalline silicon rods.

[0006] As one aspect of the embodiments of this application, this application provides a feeding cylinder for preventing silicon material contamination, comprising:

[0007] Detachable cap and cylinder body;

[0008] The cylindrical body is configured to pass through, including a first end and a second end that are disposed opposite to each other. The end connected to the cylinder cover is defined as the first end, and the other end is defined as the second end.

[0009] It also includes a protective sleeve, which is detachably fitted onto the first end of the cylinder body to abut against the cylinder cover.

[0010] Optionally, the cylinder body is provided with a first cylinder wall and a second cylinder wall in sequence along the direction from the first end to the second end, the first cylinder wall and the second cylinder wall are bent and transitioned, and the projected area of ​​the first cylinder wall along the direction from the first end to the second end is greater than the projected area of ​​the second cylinder wall along the direction from the first end to the second end.

[0011] Optionally, the sheath includes an integrally formed first socket portion, a second socket portion, and a third socket portion, wherein the second socket portion and the third socket portion are respectively located on both sides of the first socket portion in the direction from the first end to the second end, and the second socket portion is bent and transitioned with the first socket portion, and the third socket portion is also bent and transitioned with the first socket portion.

[0012] The shape and size of the sheath match the shape and size of the first cylinder wall and the second cylinder wall. The first sleeve abuts against the side wall of the first cylinder wall, the second sleeve abuts against the top wall of the first cylinder wall, and the third sleeve abuts against the bottom wall of the first cylinder wall and the side wall of the second cylinder wall.

[0013] Optionally, it also includes a connecting rod that passes through the cap and the cylinder body and is slidable relative to the cap and the cylinder body;

[0014] A quartz cone is connected to the side of the connecting rod near the second end of the cylinder. The quartz cone opens or closes the second end of the cylinder under the lifting action of the connecting rod.

[0015] Optionally, the cylinder cover is provided with a positioning sidewall, which is inserted into the first end of the cylinder and abuts against the inner edge of the sheath.

[0016] Optionally, the sheath is configured to be made of Teflon.

[0017] Optionally, it also includes a positioning ring and a telescopic rod. The positioning ring is sleeved on the outer wall of the cylinder. The outer wall of the cylinder is provided with a first flange. One end of the telescopic rod is fixedly connected to the first flange, and the other end is fixedly connected to the positioning ring.

[0018] Optionally, the outer wall of the cylinder is further provided with a flange sleeve, which abuts against the first flange, and the projected area of ​​the flange sleeve in the direction from the first end to the second end is greater than or equal to the projected area of ​​the first flange in the direction from the first end to the second end.

[0019] Optionally, the outer wall of the cylinder is provided with a second flange, and the crossbeam spans the cylinder cover and is detachably connected to the second flange;

[0020] The connecting rod passes through and is slidably connected to the crossbeam.

[0021] As another aspect of the embodiments of this application, the embodiments of this application provide a monocrystalline silicon production equipment, including a monocrystalline furnace and a feeding cylinder as described above for preventing silicon material contamination, wherein the feeding cylinder is built into or placed outside the monocrystalline furnace for feeding silicon material into the monocrystalline furnace.

[0022] The embodiments of this application employing the above-described technical solution may have the following advantages:

[0023] This application provides a feeding cylinder and monocrystalline silicon production equipment for preventing silicon material contamination. The feeding cylinder includes a detachably connected cylinder cover, cylinder body, and sheath. The cylinder body is through-type and includes a first end and a second end opposite to each other. The end connected to the cylinder cover is defined as the first end, and the other end as the second end. The sheath is detachably fitted onto the first end of the cylinder body to abut against the cylinder cover. The sheath significantly reduces collision friction compared to the traditional direct contact sealing between the cylinder cover and the cylinder body, fundamentally eliminating the source of quartz fragment generation. The sheath can effectively absorb collision energy and block external contaminants, significantly reducing the oxygen content of the silicon material. Since the sheath is detachably connected to the first end of the cylinder body, it can be easily replaced even if damaged, extending the maintenance cycle and reducing maintenance costs. The modification has low investment costs and significant benefits. While ensuring the purity of the silicon material, it is of great value in improving crystal growth stability and product yield, providing a reliable guarantee for the large-scale production of high-quality monocrystalline silicon. Attached Figure Description

[0024] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0025] Figure 1 A three-dimensional structural diagram of a feeding cylinder for preventing silicon material contamination provided in an embodiment of this application;

[0026] Figure 2 A cross-sectional view of the first state of the feeding cylinder for preventing silicon contamination provided in an embodiment of this application;

[0027] Figure 3 A cross-sectional view of the second state of the feeding cylinder for preventing silicon contamination provided in an embodiment of this application;

[0028] Figure 4 A partial cross-sectional view of the feeding cylinder for preventing silicon contamination provided in an embodiment of this application;

[0029] Figure 5 for Figure 4 An enlarged schematic diagram of part A in the middle.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Connecting rod; 2-Crossbeam; 3-Cylinder cover; 31-Positioning sidewall; 4-Cylinder body; 41-First cylinder wall; 42-Second cylinder wall; 5-Flange sleeve; 6-First flange; 7-Positioning ring; 8-Telescopic rod; 9-Hook; 10-Sleeve; 101-First socket; 102-Second socket; 103-Third socket; 11-Second flange; 12-Quartz cone. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The application will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] In this application, the term "numerical interval" (i.e., numerical range) refers to a range of values. Unless otherwise specified, the distribution of selectable values ​​within this numerical interval is considered continuous, and includes the two endpoints (i.e., the minimum and maximum values) of the interval, as well as every value between these endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that interval, it includes the two endpoints of the range and every integer between them, effectively listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in this numerical interval can be any quantitative value, such as a number, percentage, or proportion. The term "numerical interval" can broadly include percentage intervals, proportion intervals, ratio intervals, and other quantitative intervals.

[0035] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. It should be understood that these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein.

[0036] This application discloses a monocrystalline silicon production apparatus, including a monocrystalline furnace and a feeding cylinder to prevent silicon material contamination. The feeding cylinder is either built into or externally placed within the monocrystalline furnace and is used to feed silicon material into the furnace. Please refer to... Figures 1 to 3 The feeding cylinder for preventing silicon contamination includes a detachably connected cylinder cover 3 and cylinder body 4, and a connecting rod 1. The connecting rod 1 passes through the cylinder cover 3 and cylinder body 4 and can slide relative to the cylinder cover 3 and cylinder body 4. The cylinder body 4 is through-type and includes a first end and a second end that are opposite to each other. The end connected to the cylinder cover 3 is defined as the first end, and the other end is defined as the second end. A quartz cone 12 is connected to the side of the connecting rod 1 near the second end of the cylinder body 4. The quartz cone 12 opens or closes the second end of the cylinder body 4 under the lifting action of the connecting rod 1. Please refer to the following: Figure 5 The feeding cylinder disclosed in this embodiment also includes a protective sleeve 10, which is detachably fitted onto the first end of the cylinder body 4 to abut against the cylinder cover 3. The protective sleeve 10 significantly reduces collision friction compared to the traditional direct contact sealing between the cylinder cover 3 and the cylinder body 4, fundamentally eliminating the source of quartz fragment generation. The protective sleeve 10 can effectively absorb collision energy and block external contaminants, significantly reducing the oxygen content of the silicon material. Since the protective sleeve 10 is detachably connected to the first end of the cylinder body 4, it can be easily replaced even if damaged, extending the maintenance cycle and reducing maintenance costs. The modification has low investment costs and significant benefits. While ensuring the purity of the silicon material, it is of great value in improving crystal growth stability and product yield, providing a reliable guarantee for the large-scale production of high-quality monocrystalline silicon.

[0037] Specifically, such as Figure 4 and Figure 5 As shown, the cylinder 4 is provided with a first cylinder wall 41 and a second cylinder wall 42 in sequence along the direction from the first end to the second end. The first cylinder wall 41 and the second cylinder wall 42 are bent and transitioned, and the projected area of ​​the first cylinder wall 41 along the direction from the first end to the second end is greater than the projected area of ​​the second cylinder wall 42 along the direction from the first end to the second end. Figure 5The cross-sections of the first cylindrical wall 41 and the second cylindrical wall 42 shown are both rectangular. In this embodiment, the direction from the first end to the second end of the cylindrical body 4 is defined as the longitudinal direction, and the direction perpendicular to the longitudinal direction in the figure is defined as the transverse direction. The length of the rectangle in the transverse direction is defined as the length of the rectangle, and the length in the longitudinal direction is defined as the width of the rectangle. The length of the first cylindrical wall 41 is greater than the length of the second cylindrical wall 42. The relationship between the widths of the first cylindrical wall 41 and the second cylindrical wall 42 is not limited here. Further, the sheath 10 includes an integrally formed first socket portion 101 and a second socket portion. The second socket 102 and the third socket 103 are located on both sides of the first socket 101 along the direction from the first end to the second end, that is, the second socket 102 and the third socket 103 are located on both sides of the longitudinal direction of the first socket 101, and the second socket 102 and the first socket 101 are bent and transitioned, and the third socket 103 is also bent and transitioned to the first socket 101; the shape and size of the sheath 10 match the shape and size of the first cylinder wall 41 and the second cylinder wall 42, such as Figure 5 As shown, the first socket 101 abuts against the side walls on both sides of the first cylinder wall 41 in the lateral direction, the second socket 102 abuts against the top wall of the first cylinder wall 41 in the longitudinal direction, and the third socket 103 abuts against the bottom wall of the first cylinder wall 41 in the longitudinal direction and the side walls on both sides of the second cylinder wall 42 in the lateral direction. Preferably, the second socket 102 is bent perpendicularly to the first socket 101, and the third socket 103 is also bent perpendicularly to the first socket 101. With this arrangement, the first cylinder wall 41 and the second cylinder wall 42 can effectively limit the sheath 10 in three-dimensional space, preventing the sheath 10 from easily detaching from the cylinder 4.

[0038] Furthermore, such as Figure 5 As shown, the cylinder cover 3 is provided with a positioning sidewall 31, which extends longitudinally and is inserted into the first end of the cylinder body 4. It abuts against the inner edge of the sleeve 10 in the transverse direction. With this arrangement, the sleeve 10 can clamp the positioning sidewall 31 of the cylinder cover 3 in the transverse direction, preventing the cylinder cover 3 and the sleeve 10 from shaking relative to each other in the transverse direction.

[0039] As a preferred embodiment, the sheath 10 is made of Teflon. Based on Teflon's inherent properties, its high-temperature resistance allows it to stably withstand the high temperatures of the monocrystalline silicon preparation environment, maintaining structural integrity; its chemical inertness ensures no reaction with silicon, quartz, or molten silicon, avoiding contamination risks; its ultra-low coefficient of friction and self-lubricating properties significantly reduce friction during the opening and closing of the cap 3, inhibiting debris generation; its anti-adhesion surface effectively prevents silicon slag or particles from adhering, facilitating cleaning and maintenance; its material elasticity buffers impacts, protecting quartz components from hard damage; simultaneously, its lightweight and easy-to-process characteristics adapt to complex working conditions, reducing structural load and improving installation efficiency. Through these combined effects, the Teflon sheath 10 provides multiple safeguards in terms of sealing protection, contamination control, and equipment durability, offering reliable support for high-purity silicon production and process stability.

[0040] In some optional embodiments, the feeding cylinder further includes a positioning ring 7 and a telescopic rod 8. The positioning ring 7 is sleeved on the outer wall of the cylinder 4, and the outer wall of the cylinder 4 is provided with a first flange 6. One end of the telescopic rod 8 is fixedly connected to the first flange 6, and the other end is fixedly connected to the positioning ring 7. Under the action of the telescopic rod 8, the positioning ring 7 can slide longitudinally relative to the cylinder 4. In the refeeding process, the distance between the bottom of the cylinder 4 and the silicon liquid surface is controlled by adjusting the length of the telescopic rod 8 during the feeding process to prevent accidents such as silicon splashing. Preferably, the outer wall of the cylinder 4 is also provided with a flange sleeve 5, which abuts against the first flange 6. The projected area of ​​the flange sleeve 5 in the direction from the first end to the second end is greater than or equal to the projected area of ​​the first flange 6 in the direction from the first end to the second end, that is, the radial dimension of the flange sleeve 5 in the transverse direction in the figure is greater than or equal to the radial dimension of the first flange 6. With this setting, multiple objectives such as leakage protection, environmental adaptability, and convenient maintenance are achieved through physical coverage, material adaptation, structural flexibility, and functional integration.

[0041] In some alternative implementations, such as Figure 2 and Figure 3 As shown, the feeding cylinder also includes a crossbeam 2, and a second flange 11 is provided on the outer wall of the cylinder body 4. The crossbeam 2 spans across the cylinder cover 3 and is detachably connected to the second flange 11. The connecting rod 1 passes through and is slidably connected to the crossbeam 2. The crossbeam 2 has the function of limiting the connection between the cylinder cover 3 and the cylinder body 4, and also has the function of limiting the sliding stability of the connecting rod 1. Specifically, the projection of the second flange 11 along the direction from the first end to the second end is configured as a ring. This configuration has the advantages of uniform force distribution, reliable sealing, and compatibility with standardized designs.

[0042] In some alternative implementations, such as Figure 1 As shown, the end of the connecting rod 1 away from the quartz cone 12 is provided with a hook 9. The hook 9 is used to connect a counterweight block, which is used to control the height of the quartz cone 12 as it descends, thereby controlling the feeding rate of the re-feeding material.

[0043] In summary, this utility model provides a feeding cylinder and monocrystalline silicon production equipment for preventing silicon contamination. The feeding cylinder includes a detachably connected cap 3, a cylinder body 4, and a protective sleeve 10. The cylinder body 4 is through-type, including a first end and a second end positioned opposite each other. The end connected to the cap 3 is defined as the first end, and the other end as the second end. The protective sleeve 10 is detachably fitted onto the first end of the cylinder body 4 to abut against the cap 3. The protective sleeve 10 significantly reduces collision friction compared to the traditional direct contact sealing between the cap 3 and the cylinder body 4, fundamentally eliminating the source of quartz fragment generation. The protective sleeve 10 effectively absorbs collision energy and blocks external contaminants, significantly reducing the oxygen content of the silicon material. Because the protective sleeve 10 is detachably connected to the first end of the cylinder body 4, it can be easily replaced even if damaged, extending the maintenance cycle and reducing maintenance costs. The modification has low investment costs and significant benefits. While ensuring the purity of the silicon material, it is of great value in improving crystal growth stability and product yield, providing a reliable guarantee for the large-scale production of high-quality monocrystalline silicon.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] For ease of description, directional terms such as "front, back, up, down, left, right," "horizontal, vertical, horizontal," and "top, bottom" generally indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the purpose of facilitating the description of this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the referred mechanism or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the components themselves. For example, if a device in the drawings is inverted, a device described as "above" or "on top of" other devices or structures will subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0046] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] Unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0049] It should also be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0050] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0051] It should also be noted that the above are merely preferred embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A feeding cylinder for preventing silicon material contamination, characterized in that, include: A detachable cap (3) and a cylinder body (4); The cylinder (4) is through-hole and includes a first end and a second end that are opposite to each other. The end connected to the cylinder cover (3) is defined as the first end and the other end as the second end. It also includes a sheath (10), which is detachably fitted onto the first end of the cylinder (4) and used to abut against the cylinder cover (3).

2. The feeding cylinder according to claim 1, characterized in that, The cylinder (4) is provided with a first cylinder wall (41) and a second cylinder wall (42) in sequence along the direction from the first end to the second end. The first cylinder wall (41) and the second cylinder wall (42) are bent and transitioned, and the projected area of ​​the first cylinder wall (41) along the direction from the first end to the second end is greater than the projected area of ​​the second cylinder wall (42) along the direction from the first end to the second end.

3. The feeding cylinder according to claim 2, characterized in that, The sheath (10) includes an integrally formed first socket (101), a second socket (102) and a third socket (103). The second socket (102) and the third socket (103) are respectively located on both sides of the first socket (101) in the direction from the first end to the second end. The second socket (102) is bent and transitioned to the first socket (101), and the third socket (103) is also bent and transitioned to the first socket (101). The shape and size of the sheath (10) match the shape and size of the first cylindrical wall (41) and the second cylindrical wall (42). The first sleeve part (101) abuts against the side wall of the first cylindrical wall (41), the second sleeve part (102) abuts against the top wall of the first cylindrical wall (41), and the third sleeve part (103) abuts against the bottom wall of the first cylindrical wall (41) and the side wall of the second cylindrical wall (42).

4. The feeding cylinder according to any one of claims 1-3, characterized in that, It also includes a connecting rod (1) that passes through the cylinder cover (3) and the cylinder body (4) and is capable of sliding relative to the cylinder cover (3) and the cylinder body (4); A quartz cone (12) is connected to the side of the connecting rod (1) near the second end of the cylinder (4). The quartz cone (12) opens or closes the second end of the cylinder (4) under the lifting action of the connecting rod (1).

5. The feeding cylinder according to any one of claims 1-3, characterized in that, The cylinder cover (3) is provided with a positioning sidewall (31), which is inserted into the first end of the cylinder (4) and abuts against the inner edge of the sleeve (10).

6. The feeding cylinder according to any one of claims 1-3, characterized in that, The sheath (10) is made of Teflon.

7. The feeding cylinder according to any one of claims 1-3, characterized in that, It also includes a positioning ring (7) and a telescopic rod (8). The positioning ring (7) is sleeved on the outer wall of the cylinder (4), and the outer wall of the cylinder (4) is provided with a first flange (6). One end of the telescopic rod (8) is fixedly connected to the first flange (6), and the other end is fixedly connected to the positioning ring (7).

8. The feeding cylinder according to claim 7, characterized in that, The outer wall of the cylinder (4) is also provided with a flange sleeve (5), which abuts against the first flange (6). The projected area of ​​the flange sleeve (5) along the direction from the first end to the second end is greater than or equal to the projected area of ​​the first flange (6) along the direction from the first end to the second end.

9. The feeding cylinder according to claim 4, characterized in that, It also includes a crossbeam (2), and the outer wall of the cylinder (4) is provided with a second flange (11). The crossbeam (2) spans across the cylinder cover (3) and is detachably connected to the second flange (11). The connecting rod (1) passes through and is slidably connected to the crossbeam (2).

10. A monocrystalline silicon production equipment, characterized in that, include: Single crystal furnace; The feeding cylinder for preventing silicon contamination as described in any one of claims 1 to 9; The feeding cylinder is either built into or placed outside the single crystal furnace and is used to feed silicon material into the single crystal furnace.

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