A charging barrel

Abstract

The utility model relates to a kind of feeding cylinder, and the feeding cylinder includes cylinder, vertebral body assembly and metal connecting rod, vertebral body assembly includes integrally-formed vertebral body and inner layer sleeve, vertebral body is arranged at the lower end opening of cylinder, and the lower end of inner layer sleeve is connected with the upper end of vertebral body by rising or falling to block or open the lower end opening of cylinder;When vertebral body blocks the lower end opening of cylinder, the outer periphery of the part of metal connecting rod that extends into cylinder is surrounded by inner layer sleeve.Adopting the scheme, by setting integrally-formed vertebral body and inner layer sleeve, and vertebral body and inner layer sleeve are sleeved on the outside of metal connecting rod, relative to the gap between the protective sleeve outside metal connecting rod and vertebral body in prior art causes the problem of material jamming or damage, the scheme is by integrally-formed vertebral body assembly, by the wrapping of integrally-formed vertebral body assembly, effectively avoid that metal connecting rod is exposed, and also can avoid the gap between vertebral body, avoid the problem of material jamming.

Description

Technical Field

[0001] This utility model relates to the field of single crystal furnace technology, and in particular to a feeding cylinder. Background Technology

[0002] In the process of producing single-crystal silicon rods using the Czochralski method, silicon material is added to the single-crystal furnace in batches and multiple times using a quartz feeding cylinder. The bottom of the quartz feeding cylinder has a conical support, inside which is a metal connecting rod. The connecting rod moves the conical support up and down to close or open the bottom of the feeding cylinder. To prevent metal debris from the connecting rod from entering the single-crystal furnace and affecting the quality of the single-crystal silicon, a protective sleeve is usually installed on the outside of the connecting rod. However, in existing technology, the protective sleeve and the conical support rely on gravity for natural contact. Under the frictional force generated by the silicon material compression, gaps will form between the protective sleeve and the conical support, and silicon material entering these gaps can cause jamming. Utility Model Content

[0003] Based on this, a feeding cylinder is provided to solve the problem of silicon material jamming caused by gaps between the cone support and the protective sleeve outside the metal connecting rod in the prior art.

[0004] This utility model provides a feeding cylinder, which includes:

[0005] The cylindrical body is a tube open at both ends;

[0006] The vertebral body assembly includes an integrally formed vertebral body and an inner sleeve. The vertebral body is located at the lower opening of the cylinder and can be blocked or opened by rising or falling. The lower end of the inner sleeve is connected to the upper end of the vertebral body.

[0007] A metal connecting rod is inserted into the vertebral body and the inner sleeve. Its lower end is connected to the vertebral body, and its upper end passes through the upper opening of the cylinder and is connected to the output end of the drive mechanism that drives the vertebral body assembly to rise and fall.

[0008] When the cone-shaped body seals the lower opening of the cylinder, the outer periphery of the part of the metal connecting rod that extends into the cylinder is surrounded by an inner sleeve.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] In one implementation, the outer diameter of the vertebral body gradually increases from top to bottom, and the outer diameter of the inner sheath is equal to the outer diameter of the upper end of the vertebral body.

[0011] In one implementation, the feeding cylinder also includes:

[0012] The outer sleeve includes a plurality of first branch pipes arranged sequentially along the length of the metal connecting rod. Adjacent first branch pipes are connected by a first snap-fit ​​structure, and the plurality of first branch pipes are at least sleeved on the inner sleeve.

[0013] In one of the implementation methods,

[0014] The first snap-fit ​​structure includes a first boss and a first groove that cooperate with each other;

[0015] Among the two adjacent first branch pipes, the top of the lower first branch pipe has a first boss, and the bottom of the upper first branch pipe has a first groove.

[0016] The first boss has an outer diameter that gradually increases from top to bottom, and the first groove has an inner diameter that gradually increases from top to bottom;

[0017] The outer diameter of the first boss and the inner diameter of the first groove fit together to form a snap-fit.

[0018] In one implementation, the outer sleeve also includes:

[0019] The second branch tube is connected to the lower end of the first branch tube and is at least sleeved on the vertebral body.

[0020] In one implementation, the first branch pipe has an outer diameter that is equal from top to bottom, and the second branch pipe has an outer diameter that gradually increases from top to bottom.

[0021] In one implementation, the outer diameter of the upper end of the second branch pipe is equal to the outer diameter of the first branch pipe.

[0022] In one implementation, the second branch pipe and the first branch pipe are connected by a second snap-fit ​​structure.

[0023] In one implementation, the second snap-fit ​​structure includes a mating second boss and a second groove;

[0024] The bottom of the first branch pipe has a second groove, and the top of the second branch pipe has a second boss.

[0025] The second boss has an outer diameter that gradually increases from top to bottom, and the second groove has an inner diameter that gradually increases from top to bottom;

[0026] The outer diameter of the second boss and the inner diameter of the second groove fit together to form a snap-fit.

[0027] In one of the implementation methods,

[0028] The upper end of the first branch pipe at the top is provided with a third boss, which has an outer diameter that gradually increases from top to bottom;

[0029] The inner diameter of the upper end of the third boss is equal to the outer diameter of the inner sleeve.

[0030] The beneficial effects of this utility model are as follows:

[0031] By incorporating a one-piece molded cone and inner sleeve, and fitting the cone and inner sleeve over the metal connecting rod, this solution addresses the problem of gaps between the protective sleeve and the cone causing material jamming or damage, as seen in existing technologies. The one-piece molded cone assembly effectively prevents the metal connecting rod from being exposed and avoids gaps between the cone and the metal connecting rod, thus preventing material jamming. Furthermore, by limiting the area around the metal connecting rod by the inner sleeve, the portion of the metal connecting rod that extends into the cylinder during use is completely surrounded and protected by the inner sleeve, ensuring effective protection for the metal connecting rod. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the feeding cylinder in one embodiment;

[0033] Figure 2 for Figure 1 The structural diagram of the cylinder is omitted;

[0034] Figure 3 for Figure 2 Enlarged view of the upper part's local structure;

[0035] Figure 4 for Figure 2 Enlarged view of the lower part of the structure;

[0036] Figure 5 A schematic diagram of the integrated inner sleeve and ceramic support structure;

[0037] Figure 6 This is a schematic diagram of the structure of the first branch pipe located in the middle of the metal connecting rod;

[0038] Figure 7 This is a schematic diagram of the second branch pipe;

[0039] Figure 8 This is a schematic diagram of the existing technology.

[0040] In the attached figures, this technical solution Figures 1 to 7 The components represented by each number are as follows:

[0041] 1. Cylinder; 2. Metal connecting rod; 3. Cone; 4. Inner sleeve;

[0042] 5. Outer sleeve; 51. First branch pipe; 52. Second branch pipe;

[0043] 61. First boss; 62. First groove; 63. Second boss; 64. Second groove; 65. Third boss;

[0044] 7. Vertebral body assembly.

[0045] Existing technology Figure 8 middle,

[0046] 20. Metal connecting rod; 30. Cone body; 40. Protective sleeve. Detailed Implementation

[0047] 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 the illustrations provided in this embodiment are merely schematic representations of the basic concept of this utility model. Therefore, the drawings only show components relevant to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model.

[0048] like Figure 8 In the existing technology, the metal connecting rod 20 is connected to the cone 30, and a protective sleeve 40 is set outside the metal connecting rod 20. The protective sleeve 40 and the cone 30 are separate parts. Therefore, a gap will be generated between the protective sleeve 40 and the cone 30, resulting in the top of the cone 30 being exposed. Silicon material is prone to accumulate at this gap, forming a jam, which can easily damage the metal connecting rod 20 and the cone 30. In addition, as Figure 8 As shown, a protective tube 40 is provided outside the metal connecting rod 20. The protective tube 40 is designed to be segmented for easy replacement, which will create gaps between them. This will cause the silicon material to enter the gaps and get stuck, and damage the metal connecting rod 20.

[0049] One embodiment of this application provides a feeding cylinder, see [link to previous document]. Figure 1 and Figure 2The feeding cylinder includes a cylinder body 1, a cone assembly 7, and a metal connecting rod 2. The cylinder body 1 is a cylindrical shape with openings at both ends. The cone assembly 7 includes an integrally formed cone body 3 and an inner sleeve 5. The cone body 3 is located at the lower opening of the cylinder body 1 and can block or open the lower opening of the cylinder body 1 by rising or falling. The lower end of the inner sleeve 5 is connected to the upper end of the cone body 3. The metal connecting rod 2 passes through the cone body 3 and the inner sleeve 4. The lower end of the metal connecting rod 2 is connected to the cone body 3, and the upper end of the metal connecting rod 2 passes through the upper opening of the cylinder body 1 and is connected to the output end of the drive mechanism that drives the cone assembly 7 to rise and fall. When the cone body 3 blocks the lower opening of the cylinder body 1, the outer periphery of the part of the metal connecting rod 2 that extends into the cylinder body 1 is surrounded by the inner sleeve 4.

[0050] This solution employs an integrated conical body 3 and an inner sleeve 5, which are fitted over the metal connecting rod 2. The conical body 3 is used to open and close the lower opening of the cylinder 1, while the inner sleeve 5 protects the metal connecting rod 2. Compared to the existing technology where gaps exist between the protective sleeve and the conical body 3, leading to material jamming or damage, this solution, through the integrated conical body assembly 7, effectively prevents the metal connecting rod 2 from being exposed and avoids gaps between it and the conical body 3, thus preventing material jamming. Furthermore, by limiting the surrounding area of ​​the inner sleeve 5 around the metal connecting rod 2, the outer periphery of the portion of the metal connecting rod 2 that extends into the cylinder 1 during use is completely surrounded and protected by the inner sleeve 5, ensuring effective protection for the metal connecting rod 2.

[0051] In the embodiments, see Figure 1 The statement that "when the cone 3 seals the lower opening of the cylinder 1, the outer periphery of the portion of the metal connecting rod 2 that extends into the cylinder 1 is surrounded by an inner sleeve 4" refers to the fact that when the cone 3 abuts against the lower part of the cylinder 1 and seals the cylinder 1, the portion of the metal connecting rod 2 that extends into the cylinder 1 is likely to come into contact with the silicon material. Therefore, the outer periphery of the portion of the metal connecting rod 2 that extends into the cylinder 1 is surrounded by an inner sleeve 4. Since the corresponding inner sleeve 4 is surrounded by an outer sleeve 5, the portion of the metal connecting rod 2 that extends into the cylinder 1 is protected by both the inner sleeve 4 and the outer sleeve 5, thus providing better protection for the metal connecting rod 2.

[0052] In the embodiments, see Figure 4 The integrally formed cone 3 and inner sleeve 5, during the shaping process, the integral cone 3 gradually tapers and elongates from the bottom up, making the cone 3 of the bottom cone and the inner sleeve 4 of the straight tube a whole, making the connection between the cone 3 and the inner sleeve 4 safer and more stable, achieving better wrapping of the metal connecting rod 2, eliminating the connection gap between the metal connecting rod 2 and the cone 3, and solving the problem of material jamming when feeding single crystal furnace.

[0053] In some embodiments, see Figure 2 and Figure 4 The outer diameter of the cone body 3 gradually increases from top to bottom, and the outer diameter of the inner sleeve 4 is equal to the outer diameter of the upper end of the cone body 3. In this way, the cone body 3 and the inner sleeve 4 are integrally connected and smoothly transitioned, avoiding local accumulation of silicon material and facilitating the stable use of the feeding cylinder.

[0054] In the embodiments, see Figure 1 The cylinder 1 is a hollow cylindrical structure, and the cone 3 is frustum-shaped, including a large end and a small end. The diameter of the large end is larger than the inner diameter of the cylinder 1, and the small end extends away from the large end and connects to the hollow inner sleeve 4. The outer wall of the frustum transitions in an inward arc from the large end to the small end. In this way, the arc transition of the cone 3 allows the outer sleeve 5 (described in detail below) to be set into an arc transition structure corresponding to the arc transition. On the one hand, it facilitates the silicon material to roll off the upper surface of the cone 3. On the other hand, when the outer sleeve 5 wraps around the cone 3 and the inner sleeve 4, the structure of the outer sleeve 5 can fit closely to the cone 3 and be smoothly set. Moreover, the cone 3 can support the outer sleeve 5 at all positions, thereby improving the durability of the outer sleeve 5.

[0055] In some embodiments, see Figure 1 and Figure 2 The feeding cylinder also includes an outer sleeve 5, comprising multiple first branch pipes 51 arranged sequentially along the length of the metal connecting rod 2. Adjacent first branch pipes 51 are connected by a first snap-fit ​​structure, and the multiple first branch pipes 51 are at least fitted onto the inner sleeve 4. Thus, for cost considerations, the outer sleeve 5 is divided into multiple connected first branch pipes 51, so that if a single first branch pipe 51 is damaged, only the corresponding first branch pipe 51 needs to be replaced, without replacing the entire outer sleeve 5, thereby effectively controlling costs. Furthermore, the first snap-fit ​​structure between the first branch pipes 51 ensures that adjacent first branch pipes 51 are snap-fitted together, effectively reducing the possibility of displacement between adjacent first branch pipes 51 during use and the exposure of the inner sleeve 4. This prevents the inner sleeve 4 from being damaged by silicon impact due to exposure, improving the protection of the inner sleeve 4.

[0056] In the embodiments of this application, an outer sleeve 5 is provided outside the inner sleeve 4, which provides double protection for the metal connecting rod 2. Even if a gap occurs between two adjacent first branch pipes 51, causing material jamming, it will not cause damage to the metal connecting rod 2, thus strengthening the protection of the metal connecting rod 2.

[0057] In this embodiment, since the feeding cylinder is used to add silicon material, in order to ensure the normal use of the feeding cylinder and to ensure the protection of the metal connecting rod 2: the integrally formed cone 3 and the inner sleeve 5 are quartz ceramic structures; the outer sleeve 5 is a silicon tube, so as to ensure that the outer sleeve 5 can withstand the mechanical impact of silicon material, avoid the internal metal connecting rod 2 from being damaged by the impact of silicon material, and effectively extend the service life of the metal connecting rod 2.

[0058] In some embodiments, see Figure 3 and Figure 6 The first snap-fit ​​structure includes a first boss 61 and a first groove 62 that cooperate with each other. In two adjacent first branch pipes 51, the lower first branch pipe 51 has a first boss 61 at its top, and the upper first branch pipe 51 has a first groove 62 at its bottom. The first boss 61 has an outer diameter that gradually increases from top to bottom, and the first groove 62 has an inner diameter that gradually increases from top to bottom. The outer diameter of the first boss 61 and the inner diameter of the first groove 62 cooperate to form a snap-fit. Thus, by setting the first boss 61 and the first groove 62 to form a mutually matching first snap-fit ​​structure, the connection between the two adjacent first branch pipes 51 becomes tighter, providing better protection for the inner sleeve 4 and the metal connecting rod 2.

[0059] In the embodiments, see Figure 6 The first protrusion 61 is a raised, cone-shaped structure with a larger bottom and a smaller top. The first groove 62 is a cavity structure formed between the first branch pipe 51 and the metal connecting rod 2. The first protrusion 61 and the first groove 62 are tightly engaged and connected. At the first engagement structure, the two first branch pipes 51 are axially sleeved to form a double-layer silicon tube structure. In this way, when the first protrusion 61 and the first groove 62 are engaged, the first protrusion 61 extends completely into the first groove 62. That is, along the radial direction of the metal connecting rod 2, a double-layer structure of the first protrusion 61 and the first groove 62 is formed at the first engagement structure, which provides better protection for the first engagement structure. With this double-layer stacked structure and the first protrusion 61 located at the bottom, even if there is a gap between two adjacent first branch pipes 51 along the axial direction, the first branch pipe 51 with the first groove 62 at the corresponding gap position shields the inner sleeve 4, making it difficult for the silicon material to come into contact with the inner sleeve 4, thereby further enhancing the protective effect of the outer layer on the inner sleeve 4.

[0060] In some embodiments, see Figure 2 and Figure 4 The outer sheath 5 also includes a second branch tube 52, which is connected to the lower end of the lowest first branch tube 51 and is at least sleeved on the vertebral body 3. Thus, the second branch tube 52 is at least sleeved around the vertebral body 3, protecting it; Figure 8 Compared to the existing technology where the connection between the cone body 3 and the metal connecting rod 2 is exposed and has gaps, which makes it easy for silicon material to accumulate in the gaps and thus easily damage the metal connecting rod 2, the outer sleeve 5 of this application completely covers the cone body 3, thereby improving the protection of the connection position.

[0061] In the embodiments, see Figure 2 and Figure 4For the second branch tube 52, the second branch tube 52 may only wrap around the outside of the vertebral body 3 to protect the vertebral body 3, or the second branch tube 52 may wrap around both the vertebral body 3 and the inner sheath 4 to protect the vertebral body 3 and the connection between the vertebral body 3 and the inner sheath 4; for the range of the second branch tube 52 surrounding the vertebral body 3, it may only wrap around the upper part or wrap around the entire part.

[0062] In some embodiments, see Figure 2 and Figure 3 The first branch tube 51 has a uniform outer diameter from top to bottom, while the second branch tube 52 has an outer diameter that gradually increases from top to bottom. This ensures that the second branch tube 52 can better fit and protect the vertebral body 3.

[0063] In some embodiments, see Figure 2 and Figure 4 The outer diameter of the upper end of the second branch pipe 52 is equal to the outer diameter of the first branch pipe 51. In this way, the second branch pipe 52 and the first branch pipe 51 are axially fitted together, so that the outer diameter of the second branch pipe 52 and the first branch pipe 51 at the connection position is the same, so as to ensure a smooth transition of the outer diameter of the second branch pipe 52 and the first branch pipe 51, reduce the accumulation of silicon material at this point, and allow the silicon material to fall more effectively.

[0064] In some embodiments, see Figure 2 and Figure 4 The second branch pipe 52 and the first branch pipe 51 are connected by a second snap-fit ​​structure. In this way, the snap-fit ​​structure makes the connection between the second branch pipe 52 and the first branch pipe 51 tighter and more reliable, avoiding the phenomenon of axial separation of the second branch pipe 52 and the first branch pipe 51 when subjected to silicon material impact, thereby allowing the outer sleeve 5 to better protect the inner sleeve 4.

[0065] In some embodiments, see Figure 2 and Figure 4 The second snap-fit ​​structure includes a second boss 63 and a second groove 64 that fit together. The bottom of the first branch pipe 51 has a second groove 64, and the top of the second branch pipe 52 has a second boss 63. The second boss 63 has an outer diameter that gradually increases from top to bottom, and the second groove 64 has an inner diameter that gradually increases from top to bottom. The outer diameter of the second boss 63 and the inner diameter of the second groove 64 fit together to form a snap-fit. In this way, the connection between the second branch pipe 52 and the first branch pipe 51 is also a snap-fit ​​structure, which facilitates disassembly and avoids the impact of silicon material on the inner sleeve 4 when axially loosening.

[0066] In the embodiments, see Figure 4 and Figure 7The structure of the second protrusion 63 and the second groove 64 is similar to that of the first protrusion 61 and the first groove 62. Both the first protrusion 61 and the second protrusion 63 are convex and have a frustum structure with a smaller bottom and a larger top. The second protrusion 63 and the second groove 64 are tightly connected, so that the first branch pipe 51 and the second branch pipe 52 corresponding to the second connection structure are axially sleeved to form a double-layer silicon tube structure, so as to achieve a better protection effect for the inner sleeve 4 and the cone 3.

[0067] In the embodiments, see Figure 1 and Figure 2 Multiple first branch pipes 51 and one second branch pipe 52 are coaxially arranged.

[0068] In some embodiments, see Figure 3 The uppermost branch pipe 51 is provided with a third protrusion 65, which has an outer diameter that gradually increases from top to bottom; the inner diameter of the upper end of the third protrusion 65 is equal to the outer diameter of the inner sleeve 4. In this way, the corresponding third protrusion 65 provides protection for the upper part of the metal connecting rod 2, and the truncated cone structure, which is smaller at the top and larger at the bottom, also facilitates the falling of silicon material.

[0069] In the embodiments, see Figure 1 and Figure 3 The third protrusion 65 can be located at the part of the metal connecting rod 2 that extends out of the cylinder 1. The third protrusion 65 can have less contact with the silicon material. Since the third protrusion 65 is located at the top of the outer sleeve 5, the third protrusion 65 can surround the outer sleeve 4.

[0070] In this embodiment, the entire outer sleeve 5 completely covers the outer periphery of the inner sleeve 4, ensuring that the outer periphery of the portion of the corresponding metal connecting rod 2 that extends into the cylinder 1 during use is covered by both the inner sleeve 4 and the silicon outer sleeve 5, thus guaranteeing protection for the metal connecting rod 2; furthermore, see... Figure 3 The top of the inner sleeve 4 can also extend beyond the top of the outer sleeve 5.

[0071] In other embodiments, see Figure 4 and Figure 5 A mounting hole is provided in the middle of the vertebral body 3, and the metal connecting rod 2 passes through the mounting hole. The vertebral body 3 and the metal connecting rod 2 are detachably connected by bolts. In this way, the vertebral body 3 and the metal connecting rod 2 are connected together by detachable bolts, which facilitates the disassembly and installation of the vertebral body 3 and the metal connecting rod 2.

[0072] In application, this utility model features an outer sleeve 5 with a first branch pipe 51 and a second branch pipe 52, forming a double-layer branch pipe connection structure between adjacent branch pipes in the outer sleeve 5, providing double protection. A third protruding boss 65 is provided at one end of the outer sleeve 5 that protrudes from the cylinder body, corresponding to the top of the first branch pipe 51, to increase the axial coverage and effectively enhance the protection of the inner sleeve 4. The outer sleeve 5 is made of silicon material, improving the impact resistance of the metal material. The double-layer sleeve structure of the inner sleeve 4 and the outer sleeve 5 enhances the protection of the metal connecting rod 2. The integrally formed cone 3 and inner sleeve 4 solve the problem of material jamming at the connection point between the cone 3 and the metal connecting rod 2.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the 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 application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A feeding cylinder, characterized in that, The feeding cylinder includes: The cylindrical body (1) is a cylindrical shape with openings at both ends; The vertebral body assembly (7) includes an integrally formed vertebral body (3) and an inner sleeve (5). The vertebral body (3) is located at the lower end opening of the cylinder (1) and can be blocked or opened by rising or falling. The lower end of the inner sleeve (5) is connected to the upper end of the vertebral body (3). Metal connecting rod (2) is inserted into the vertebral body (3) and the inner sleeve (4), with its lower end connected to the vertebral body (3) and its upper end passing through the upper opening of the cylinder (1) and connected to the output end of the drive mechanism that drives the vertebral body assembly (7) to rise and fall. When the cone (3) blocks the lower opening of the cylinder (1), the outer periphery of the portion of the metal connecting rod (2) that extends into the cylinder (1) is surrounded by the inner sleeve (4).

2. The feeding cylinder according to claim 1, characterized in that, The outer diameter of the vertebral body (3) gradually increases from top to bottom, and the outer diameter of the inner sheath (4) is equal to the outer diameter of the upper end of the vertebral body (3).

3. The feeding cylinder according to claim 1, characterized in that, The feeding cylinder also includes: The outer sleeve (5) includes a plurality of first branch pipes (51) arranged sequentially along the length of the metal connecting rod (2), adjacent first branch pipes (51) are connected by a first snap-fit ​​structure, and the plurality of first branch pipes (51) are at least sleeved on the inner sleeve (4).

4. The feeding cylinder according to claim 3, characterized in that, The first snap-fit ​​structure includes a first boss (61) and a first groove (62) that cooperate with each other; Among the two adjacent first branch pipes (51), the top of the lower first branch pipe (51) has the first boss (61), and the bottom of the upper first branch pipe (51) has the first groove (62). The first boss (61) has an outer diameter that gradually increases from top to bottom, and the first groove (62) has an inner diameter that gradually increases from top to bottom; The outer diameter of the first boss (61) and the inner diameter of the first groove (62) engage with each other to form a snap-fit.

5. The feeding cylinder according to claim 3, characterized in that, The outer sleeve (5) also includes: The second branch (52) is connected to the lower end of the first branch (51) and is at least sleeved on the vertebral body (3).

6. The feeding cylinder according to claim 5, characterized in that, The first branch pipe (51) has an equal outer diameter from top to bottom, and the second branch pipe (52) has an outer diameter that gradually increases from top to bottom.

7. The feeding cylinder according to claim 6, characterized in that, The outer diameter of the upper end of the second branch pipe (52) is equal to the outer diameter of the first branch pipe (51).

8. The feeding cylinder according to claim 5, characterized in that, The second branch pipe (52) and the first branch pipe (51) are connected by a second snap-fit ​​structure.

9. The feeding cylinder according to claim 7, characterized in that, The second snap-fit ​​structure includes a mating second boss (63) and a second groove (64); The bottom of the first branch pipe (51) has the second groove (64), and the top of the second branch pipe (52) has the second boss (63). The second boss (63) has an outer diameter that gradually increases from top to bottom, and the second groove (64) has an inner diameter that gradually increases from top to bottom; The outer diameter of the second boss (63) and the inner diameter of the second groove (64) engage with each other to form a snap-fit.

10. The feeding cylinder according to claim 4, characterized in that, The upper end of the first branch pipe (51) located at the top is provided with a third boss (65), and the third boss (65) has an outer diameter that gradually increases from top to bottom; The inner diameter of the upper end of the third boss (65) is equal to the outer diameter of the inner sleeve (4).

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