Leak-proof star-shaped feeder

Abstract

The invention provides a leakproof star-shaped feeder, and relates to the technical field of material conveying, the leakproof star-shaped feeder comprises: a housing, the upper part of which is provided with a feed inlet and the lower part of which is provided with a discharge outlet; the rotating shaft is transversely arranged in the shell, and the end part of the rotating shaft is connected with the shell through a bearing; the blades are located between the feeding port and the discharging port, one ends of the blades make sealing contact with the inner wall of the shell, the other ends of the blades are in transmission connection with the rotating shaft, and the multiple blades are arranged in the circumferential direction of the rotating shaft at intervals; the first sealing structure is arranged between the rotating shaft and the shell and is positioned between the bearing and the blade; the second sealing structure is arranged between the rotating shaft and the shell and located between the first sealing structure and the blade; a closed cavity is formed between the first sealing structure and the second sealing structure; and the pressure measuring instrument is communicated with the closed cavity. Compared with the prior art that maintenance measures are taken after the accident occurs, the leakage risk can be detected and found in advance, and the accident of harmful gas leakage can be avoided by adopting preventive maintenance measures.

Description

Technical Field

[0001] The present invention relates to the technical field of material conveying, and in particular to a star feeder with leak prevention. Background Art

[0002] The star feeder mainly consists of components such as an impeller, a housing, a reducer, and a motor. Its working principle is that materials fall and fill the gaps between adjacent blades of the impeller, and then as the blades rotate, the materials are discharged.

[0003] When a star feeder is used in the production process of polysilicon, due to the toxicity of the gas inside the polysilicon production equipment, strict requirements for no leakage and high airtightness are imposed on the star feeder.

[0004] However, although the existing star feeders have taken sealing measures, there is still a risk of leakage in actual use, and once leakage occurs, it can often only be dealt with afterwards, showing a lag, which brings potential hidden dangers to the production process. Summary of the Invention

[0005] In view of the above situation, the present invention provides a star feeder with leak prevention, aiming to solve the technical problem that although the existing star feeders have taken sealing measures, there is still a risk of leakage in actual use, and once leakage occurs, it can often only be dealt with afterwards, showing a lag, which brings potential hidden dangers to the production process.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a star feeder with leak prevention, including:

[0008] A housing having a feed inlet at its upper part and a discharge outlet at its lower part;

[0009] A rotating shaft horizontally arranged inside the housing, and the end of the rotating shaft is connected to the housing through a bearing;

[0010] Blades located between the feed inlet and the discharge outlet, one end of each blade is in sealed contact with the inner wall of the housing and the other end is in transmission connection with the rotating shaft, and a plurality of blades are arranged at intervals along the circumference of the rotating shaft;

[0011] A first sealing structure provided between the rotating shaft and the housing and located between the bearing and the blades;

[0012] A second sealing structure provided between the rotating shaft and the housing and located between the first sealing structure and the blades; a sealed cavity is formed between the first sealing structure and the second sealing structure;

[0013] A pressure measuring instrument communicated with the sealed cavity.

[0014] In some embodiments of the present invention, the second sealing structure includes a second sealing ring.

[0015] In some embodiments of the present invention, the second sealing structure further includes a positioning sleeve. The positioning sleeve is axially provided with a central hole. One end of the positioning sleeve has a placement groove, and the diameter of the placement groove is larger than that of the central hole. The central hole communicates with the placement groove. The positioning sleeve is sleeved on the rotating shaft through the central hole, and the second sealing ring is arranged in the placement groove.

[0016] In some embodiments of the present invention, a plurality of second sealing rings are arranged at intervals along the axis of the positioning sleeve, and adjacent second sealing rings are separated by a retaining ring.

[0017] In some embodiments of the present invention, a third sealing structure is further included. The third sealing structure is arranged between the rotating shaft and the housing and is located between the second sealing structure and the blade.

[0018] In some embodiments of the present invention, the third sealing structure includes a third sealing ring. One side of the third sealing ring has a second opening with a V-shaped cross-section. One end of the second opening is narrowed and the other end is open.

[0019] In some embodiments of the present invention, the outer wall of the third sealing ring has an outwardly extending wing portion. The third sealing structure further includes a pressure ring. The pressure ring is connected to the housing. One end of the pressure ring has an annular protrusion, and the end face of the annular protrusion is used to tightly press the wing portion of the third sealing ring against the end of the positioning sleeve. The third sealing ring is arranged between the annular protrusion and the rotating shaft.

[0020] In some embodiments of the present invention, the following are further included:

[0021] A fixed plate, fastened inside the housing;

[0022] A movable plate in an arc shape, the inner side of which is in sliding sealing contact with the end of at least one blade, and the outer side of which is connected to the fixed plate through an elastic component;

[0023] There are two movable plates, which are symmetrically arranged on opposite sides of the rotating shaft. A first gap is left between the upper ends of the two movable plates, and a second gap is left between the lower ends of the two movable plates. The first gap is aligned and communicated with the feed port, and the second gap is aligned and communicated with the discharge port.

[0024] In some embodiments of the present invention, the following are further included:

[0025] An axial channel, arranged axially in the pressure ring; a blocking plate is arranged in the axial channel;

[0026] A radial channel, arranged radially in the pressure ring. One end of the radial channel communicates with the axial channel, and the other end extends to the outer wall of the pressure ring; hydraulic oil is filled in the radial channel;

[0027] A guide rod is provided with a piston thereon, and the piston is in sliding sealing fit with the axial channel; one end of the radial channel is located between the piston and the plug plate; the guide rod penetrates through the plug plate in a sliding sealing manner.

[0028] An elastic strip is arranged at one end of the guide rod, and the end of the elastic strip is in sliding contact with the inner wall of the second opening.

[0029] A spring is used to move the elastic strip towards the narrowed end of the second opening.

[0030] A movable column has one end in contact with the inner side of the movable plate and the other end extending into the pressure ring and being in sliding sealing fit with the radial channel.

[0031] In some embodiments of the present invention, it further includes an annular movable side plate sleeved on the rotating shaft. One side of the movable side plate is connected to the pressure ring through a telescopic structure. There is a gap between the movable side plate and the side surface of the blade. One side of the movable side plate faces the movable plate and has an inclined surface; a wedge-shaped block is provided on the inner side of the movable plate, and one side of the wedge-shaped block is inclined and in sliding contact with the inclined surface.

[0032] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0033] Compared with taking maintenance measures after an accident occurs, this embodiment can detect and discover the leakage risk in advance and adopt preventive maintenance measures to avoid accidents of harmful gas leakage.

[0034] Other features and advantages of the present invention will be described in the subsequent description, and part of them will become obvious from the description or be understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 It is a schematic structural diagram of the star feeder for leak prevention provided in Embodiment 1;

[0037] Figure 2 For Figure 1 the top view;

[0038] Figure 3 For Figure 1 the sectional view along the A-A direction;

[0039] Figure 4 For Figure 3 the sectional view along the B-B direction;

[0040] Figure 5 is Figure 3 the partially enlarged view of position C in

[0041] Figure 6 is the exploded view of the second sealing structure and the third sealing structure;

[0042] Figure 7 is the structural schematic diagram of the leak-proof star feeder provided in Embodiment 2;

[0043] Figure 8 is Figure 7 the partially enlarged view of position D in

[0044] Figure 9 is the structural schematic diagram of the elastic strip provided in Embodiment 3;

[0045] Figure 10 is Figure 9 the partially enlarged view of position E in

[0046] Figure 11 is Figure 10 the partially enlarged view of position F in

[0047] Figure 12 is Figure 9 the partially enlarged view of position G in

[0048] Icon:

[0049] 1 - housing, 11 - feed inlet, 12 - discharge outlet,

[0050] 2 - rotating shaft, 21 - bearing,

[0051] 3 - blade, 31 - mounting sleeve,

[0052] 41 - first sealing ring,

[0053] 51 - second sealing ring, 511 - first opening, 52 - positioning sleeve, 521 - central hole, 522 - storage groove, 53 - retaining ring,

[0054] 6 - sealed cavity,

[0055] 71 - pressure measurement interface, 72 - pressure measurement instrument,

[0056] 81 - third sealing ring, 811 - second opening, 812 - wing part, 82 - pressing ring, 821 - annular protrusion,

[0057] 91 - fixed plate, 92 - moving plate, 921 - wedge block, 93 - arc-shaped elastic piece, 94 - axial channel, 941 - plug plate, 95 - radial channel, 96 - guide rod, 961 - piston, 97 - elastic strip, 98 - movable column, 99 - movable side plate, 991 - inclined surface. Detailed implementation manners

[0058] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention.

[0059] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present invention.

[0060] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0061] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0062] The embodiments of the present invention will be described in detail below.

[0063] Embodiment 1

[0064] Refer to Figures 1 to 6 , this embodiment provides a leak-proof star feeder, including a housing 1, a rotating shaft 2, blades 3, a first sealing structure, a second sealing structure, a pressure measuring interface 71 and a pressure measuring instrument 72.

[0065] The upper part of the housing 1 has a feed inlet 11, and the lower part has a discharge outlet 12. The feed inlet 11 is used to connect with the material conveying pipeline, and the discharge outlet 12 is used to connect with the polysilicon production equipment.

[0066] The rotating shaft 2 is horizontally arranged inside the housing 1, and the ends of the rotating shaft 2 are connected to the housing 1 through bearings 21.

[0067] The blades 3 are located between the feed inlet 11 and the discharge outlet 12. One end of each blade 3 is in sealed contact with the inner wall of the housing 1, and the other end is connected with a mounting sleeve 31. A plurality of blades 3 are arranged at intervals along the circumferential direction of the mounting sleeve 31. The mounting sleeve 31 is sleeved on the rotating shaft 2 and the two are connected by key transmission.

[0068] The first sealing structure is arranged between the rotating shaft 2 and the housing 1 and is located between the bearing 21 and the blade 3.

[0069] The second sealing structure is arranged between the rotating shaft 2 and the housing 1 and is located between the first sealing structure and the blade 3; a sealed cavity 6 is formed between the first sealing structure and the second sealing structure.

[0070] The pressure measuring interface 71 is installed on the housing 1 and can communicate with the sealed cavity 6.

[0071] The pressure measuring instrument 72 is connected to the pressure measuring interface 71.

[0072] The working principle of the leak-proof star feeder is as follows: when the rotating shaft 2 rotates at a constant speed, the material entering the housing 1 from the feed inlet 11 falls and fills the space between two adjacent blades 3. As the rotating shaft 2 and the blades 3 rotate, the material is discharged from the discharge outlet 12. Through the setting of the first sealing structure and the second sealing structure, on the one hand, a multi-stage seal is formed between the rotating shaft 2 and the housing 1, reducing the leakage probability of harmful gases; on the other hand, it is convenient to form a sealed cavity 6 between the first sealing structure and the second sealing structure, and the pressure change of the sealed cavity 6 is detected by the pressure measuring instrument 72 to predict the leakage risk. Specifically, when the second sealing structure fails, harmful gases enter the sealed cavity 6 from between the rotating shaft 2 and the housing 1, causing the pressure in the sealed cavity 6 to rise, and the pressure data detected by the pressure measuring instrument 72 increases, which reflects that a leakage situation is about to occur (since the working condition of the first sealing structure is better than that of the second sealing structure, the service life of the first sealing structure is longer. Usually, when the second sealing structure fails, the first sealing structure has not failed yet. When both the first sealing structure and the second sealing structure fail, leakage will occur), and the second sealing structure needs to be replaced in time. That is to say, compared with taking maintenance measures after an accident occurs, this embodiment can detect and discover the leakage risk in advance and adopt preventive maintenance measures to avoid the accident of harmful gas leakage.

[0073] The first sealing structure includes a ring-shaped first sealing ring 41, and the second sealing structure includes a ring-shaped second sealing ring 51. The inner side of the ring-shaped second sealing ring 51 is in direct or indirect contact with the rotating shaft 2, and the outer side is in direct or indirect contact with the housing 1, thereby achieving sealing.

[0074] The first sealing ring 41 and the second sealing ring 51 have the same shape. One side of the second sealing ring 51 has a first opening 511 with a substantially V-shaped cross-section. One end of the first opening 511 is narrowed, and the other end is open and bent inward. By adjusting the size of the open end of the first opening 511, the pre-tightening force of the second sealing ring 51 during assembly can be adjusted, which helps to improve the airtight performance of the first sealing ring 41.

[0075] To facilitate the positioning of the second sealing ring 51, the second sealing structure further includes a positioning sleeve 52. The positioning sleeve 52 is axially provided with a central hole 521. One end of the positioning sleeve 52 has a storage groove 522. The diameter of the storage groove 522 is larger than the diameter of the central hole 521, and the central hole 521 communicates with the storage groove 522. The positioning sleeve 52 is sleeved on the rotating shaft 2 through the central hole 521. The second sealing ring 51 is arranged in the storage groove 522 of the positioning sleeve 52. A plurality of second sealing rings 51 are arranged at intervals along the axis of the positioning sleeve 52, and adjacent second sealing rings 51 are separated by a retaining ring 53. After the positioning sleeve 52 is sleeved on the rotating shaft 2, the storage groove 522 is blocked by the housing 1, and the second sealing ring 51 is limited in the storage groove 522.

[0076] It can be understood that a sealing measure should also be taken between the outer side of the positioning sleeve 52 and the housing 1.

[0077] The anti-leakage star feeder further includes a third sealing structure. The third sealing structure is arranged between the rotating shaft 2 and the housing 1 and is located between the second sealing structure and the blade 3. From the foregoing, it can be seen that the first sealing structure, the second sealing structure, and the third sealing structure are arranged at intervals along the axis of the rotating shaft 2, and the multi-stage sealing improves the airtightness.

[0078] The third sealing structure includes a ring-shaped third sealing ring 81. The inner side of the ring-shaped third sealing ring 81 is in direct or indirect contact with the rotating shaft 2, and the outer side is in direct or indirect contact with the housing 1, thereby achieving sealing.

[0079] One side of the third sealing ring 81 has a second opening 811 with a substantially V-shaped cross-section. One end of the second opening 811 is narrowed, and the other end is open and bent inward. The outer wall of the third sealing ring 81 has an outwardly extending wing portion 812. By adjusting the size of the open end of the second opening 811, the pre-tightening force of the third sealing ring 81 during assembly can be adjusted, which helps to improve the airtight performance of the third sealing ring 81.

[0080] To facilitate the positioning of the third sealing ring 81, the third sealing structure further includes a pressing ring 82. The pressing ring 82 is connected to the housing 1. One end of the pressing ring 82 has an annular protrusion 821. The end face of the annular protrusion 821 is used to tightly press the wing portion 812 of the third sealing ring 81 against the end of the positioning sleeve 52. The third sealing ring 81 is disposed between the annular protrusion 821 and the rotating shaft 2, thereby realizing the positioning of the third sealing ring 81.

[0081] It can be understood that sealing measures should also be taken between the pressing ring 82 and the housing 1.

[0082] In other embodiments, the first sealing structure, the second sealing structure, and the third sealing structure may include sealing packing.

[0083] Embodiment 2

[0084] This embodiment is a further improvement based on Embodiment 1.

[0085] See Figures 1 to 8 , the leak-proof star feeder further includes a fixed plate 91 and a moving plate 92. The fixed plate 91 is fastened inside the housing 1. The moving plate 92 is arc-shaped. The inner side of the moving plate 92 is in sliding sealing contact with the end of at least one blade 3, and the outer side is connected to the fixed plate 91 through an elastic component; there are two moving plates 92, and the two moving plates 92 are symmetrically arranged on opposite sides of the rotating shaft 2. A first gap is left between the upper ends of the two moving plates 92, and a second gap is left between the lower ends. The first gap is aligned and communicated with the feed port 11, and the second gap is aligned and communicated with the discharge port 12.

[0086] The end of the blade 3 is easily worn. Through the above solution, after the end of the blade 3 is worn, the elastic component's restoring force is used to push the moving plate 92, so that the moving plate 92 remains in contact with the end of the blade 3, thereby ensuring good airtightness between the blade 3 and the moving plate 92 and preventing harmful gases from entering the feed port 11.

[0087] The elastic component includes an arc-shaped elastic piece 93. The two ends of the arc-shaped elastic piece 93 are slidably connected to the fixed plate 91 (realized through the cooperation of structures such as sliders and chutes), and the middle part is arched and fastened to the outer side of the moving plate 92.

[0088] Embodiment 3

[0089] This embodiment is a further improvement based on Embodiment 2.

[0090] See Figures 1 to 12 , the leak-proof star feeder further includes an axial channel 94, a radial channel 95, a guide rod 96, a spring, an elastic strip 97, and a movable column 98.

[0091] The axial channel 94 is arranged axially in the pressing ring 82; a plug plate 941 is arranged in the axial channel 94.

[0092] The radial channel 95 is arranged in the pressing ring 82 along the radial direction of the pressing ring 82, one end of the radial channel 95 is communicated with the axial channel 94, and the other end extends to the outer wall of the pressing ring 82. The radial channel 95 is filled with hydraulic oil.

[0093] A piston 961 is provided on the guide rod 96 , and the piston 961 is in sliding and sealing cooperation with the axial channel 94 ; one end of the radial channel 95 is located between the piston 961 and the blocking plate 941 ; the guide rod 96 is sliding and sealingly penetrates the blocking plate 941 .

[0094] The elastic strip 97 is disposed at one end of the guide rod 96 , and the end of the elastic strip 97 is in sliding contact with the inner wall of the second opening 811 .

[0095] One end of the spring is connected to the guide rod 96 , and the other end is connected to the axial channel 94 . The spring is used to move the elastic strip 97 toward the narrowed end of the second opening 811 .

[0096] One end of the movable column 98 contacts the inner side of the movable plate 92 , and the other end extends into the pressure ring 82 and is in sliding sealing cooperation with the radial channel 95 .

[0097] When the elastic component pushes the movable plate 92 to move toward the blade 3, the movable plate 92 drives the movable column 98, and the movable column 98 squeezes the hydraulic oil. The hydraulic oil drives the piston 961 and the guide rod 96, and the guide rod 96 drives the elastic strip 97 to move, so that the elastic strip 97 moves toward the narrowed end of the second opening 811. Since the inner wall of the second opening 811 is inclined, in the process of the elastic strip 97 moving toward the narrowed end of the second opening 811, the elastic strip 97 will make the second opening 811 have a tendency to open, so as to increase the contact pressure between the third sealing ring 81 and the annular protrusion 821 of the rotating shaft 2 and the pressure ring 82, thereby utilizing the slight movement of the movable plate 92 to improve the sealing performance of the third sealing ring 81. The force of the arc-shaped spring sheet 93 of the elastic component can deform the elastic strip 97, so that the elastic strip 97 can bend and will not hinder the normal movement of the movable plate 92.

[0098] Example 4

[0099] This embodiment is a further improvement made on the basis of Embodiment 3.

[0100] See also Figures 1 to 12, the leakage-proof star feeder further includes an annular movable side plate 99 sleeved on the rotating shaft 2. One side of the movable side plate 99 is connected to the pressing ring 82 through a telescopic structure. There is a small gap between the movable side plate 99 and the side surface of the blade 3. One side of the movable side plate 99 faces the movable plate 92 and has an inclined surface 991; the inner side of the movable plate 92 has a wedge-shaped block 921, and one side of the wedge-shaped block 921 is inclined and is in sliding contact with the inclined surface 991 of the movable side plate 99. In this way, when the movable plate 92 moves to compensate for the wear of the end of the blade 3, the movable plate 92 can push the movable side plate 99 through the wedge-shaped block 921, so that the movable side plate 99 moves towards the side surface of the blade 3 to slightly reduce the gap between the movable side plate 99 and the side surface of the blade 3, avoiding the risk that materials enter the gap, are ground and become smaller, and then enter between the pressing ring 82 and the rotating shaft 2, thus eliminating the potential risk of material leakage.

[0101] Finally, it should be noted that the above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A leak-proof star feeder, characterized in that, Comprising: A housing having a feed inlet at its upper part and a discharge outlet at its lower part; A rotating shaft transversely arranged inside the housing, and the ends of the rotating shaft are connected to the housing through bearings; Blades located between the feed inlet and the discharge outlet, one end of each blade being in sealed contact with the inner wall of the housing and the other end being in driving connection with the rotating shaft, and a plurality of blades are arranged at intervals along the circumference of the rotating shaft; A first sealing structure arranged between the rotating shaft and the housing and located between the bearing and the blades; A second sealing structure arranged between the rotating shaft and the housing and located between the first sealing structure and the blades; a sealed cavity is formed between the first sealing structure and the second sealing structure; A pressure measuring instrument communicating with the sealed cavity.

2. The leak-proof star feeder according to claim 1, characterized in that, The second sealing structure includes a second sealing ring.

3. The anti-leakage star feeder according to claim 2, characterized in that, The second sealing structure further includes a positioning sleeve. The positioning sleeve is axially provided with a central hole. One end of the positioning sleeve has a placement groove, the diameter of the placement groove being larger than that of the central hole, and the central hole communicates with the placement groove; the positioning sleeve is sleeved on the rotating shaft through the central hole, and the second sealing ring is arranged in the placement groove.

4. The leak-proof star feeder according to claim 3, characterized in that, A plurality of the second sealing rings are arranged at intervals along the axis of the positioning sleeve, and adjacent second sealing rings are separated by a retaining ring.

5. The leak-proof star feeder according to claim 3, characterized in that, It further includes a third sealing structure arranged between the rotating shaft and the housing and located between the second sealing structure and the blades.

6. The leak-proof star feeder according to claim 5, characterized in that, The third sealing structure includes a third sealing ring; one side of the third sealing ring has a second opening with a V-shaped cross section, one end of the second opening being narrowed and the other end being open.

7. The leak-proof star feeder according to claim 6, characterized in that, The outer wall of the third sealing ring has an outwardly extending wing portion; the third sealing structure further includes a pressing ring connected to the housing. One end of the pressing ring has an annular protrusion, and the end face of the annular protrusion is used to tightly press the wing portion of the third sealing ring against the end of the positioning sleeve, and the third sealing ring is arranged between the annular protrusion and the rotating shaft.

8. The leak-proof star feeder according to claim 7, characterized in that, It further includes: A fixed plate fastened inside the housing; An arc-shaped moving plate, the inner side of which is in sliding sealed contact with the end of at least one of the blades, and the outer side of which is connected to the fixed plate through an elastic component; There are two moving plates symmetrically arranged on opposite sides of the rotating shaft. A first gap is left between the upper ends of the two moving plates, and a second gap is left between the lower ends of the two moving plates. The first gap is aligned and communicated with the feed inlet, and the second gap is aligned and communicated with the discharge outlet.

9. The leak-proof star feeder according to claim 8, wherein, It further includes: An axial channel arranged axially in the pressing ring; A blocking plate is arranged in the axial channel; A radial channel arranged radially in the pressing ring. One end of the radial channel communicates with the axial channel and the other end extends to the outer wall of the pressing ring; the radial channel is filled with hydraulic oil; A guide rod is provided with a piston, and the piston is in sliding sealed cooperation with the axial channel; one end of the radial channel is located between the piston and the blocking plate; the guide rod slides and seals through the blocking plate; An elastic strip is arranged at one end of the guide rod, and the end of the elastic strip is in sliding contact with the inner wall of the second opening; A spring is used to move the elastic strip towards the narrowed end of the second opening; The movable column has one end in contact with the inner side of the movable plate, and the other end extends into the pressing ring and is in sliding sealing fit with the radial channel.

10. The leak-proof star feeder according to claim 8 or 9, characterized in that, It further includes an annular movable side plate sleeved on the rotating shaft. One side of the movable side plate is connected to the pressing ring through a telescopic structure. There is a gap between the movable side plate and the side surface of the blade. One side of the movable side plate faces the movable plate and has an inclined surface; a wedge block is provided on the inner side of the movable plate, and one side of the wedge block is inclined and in sliding contact with the inclined surface.

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