Vertical centrifugal volute structure

Abstract

The vertical centrifugal volute structure comprises a volute body, the volute body comprises a left side plate and a right side plate which are matched with each other, air outlets are formed in the outer sides of the left side plate and the right side plate, an adsorption frame is integrally formed on the outer side of the right side plate, and an air inlet is integrally formed in the inner side of the adsorption frame; and an outer pipe II is fixed in the air inlet, and a blocking part for limiting the particles is arranged in the outer pipe II. Particles and flocks can be blocked through the blocking part of the air inlet of the volute body, the volute body is protected, meanwhile, the environment-friendly effect is achieved, the driven impeller scrapes along the filter screen of the second cavity opening, the filter screen of the second cavity opening is cleaned, and therefore the filter screen of the second cavity opening is cleaned. Scraped particles enter the collecting frame and are accumulated in the collecting frame, extra driving force is not needed, it is ensured that air enters the filter screen of the second cavity opening all the time, and the air inlet amount is ensured to a certain degree while the particles are collected.

Description

Technical Field

[0001] The invention relates to the technical field of volutes, and in particular to a vertical centrifugal volute structure. Background Art

[0002] The centrifugal volute, also known as the centrifugal wind volute, is an important part of the centrifugal fan, formed by welding or biting the left and right side plates of the shell with the volute. The centrifugal volute guides the air from the inlet of the fan through its specific shape design and rotates along the curve shape of the volute, which helps to increase the pressure and flow rate of the fan.

[0003] Centrifugal fans are generally used to extract gas, but in many environments, the extracted gas contains not only gas but also certain particles, especially when the gas flow rate is high. When the gas entering the centrifugal volute contains particles, these particles may damage the centrifugal volute. The particles move with the flow in the airflow, constantly collide and rub with the inner wall of the volute, causing the surface material of the volute to gradually wear out. This wear is continuous and cumulative, and long-term operation will cause the volute wall thickness to thin or even perforate. The particles rub against the inner wall of the volute, causing the volute material to gradually wear out. The corrosion resistance of the worn volute is also relatively reduced, and it is more likely to rust, affecting its life. In addition, the larger the particle size, the greater its inertia force, and the more obvious the impact and wear on the volute. The higher the particle concentration, the more particles contact the volute per unit time, and the faster the wear rate. The higher the gas flow rate, the greater the kinetic energy of the particles in the airflow, and the stronger the impact and wear on the volute. Summary of the invention

[0004] The object of the present invention is to provide a vertical centrifugal volute structure to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a vertical centrifugal volute structure, comprising a volute body, the volute body comprising a left plate and a right plate that cooperate with each other, an air outlet is formed on the outer side of the left plate and the right plate, an adsorption frame is integrally formed on the outer side of the right plate, an air inlet is integrally formed on the inner side of the adsorption frame, an outer tube 2 is fixed in the air inlet, and a blocking part for limiting particles is provided inside the outer tube 2;

[0006] The blocking part comprises a plurality of collecting frames and a driven impeller which are distributed in a circumferential manner. The driven impeller is arranged on the outside of a plurality of groups of the collecting frames and is used for pushing particles into the collecting frames.

[0007] Furthermore, an active impeller for driving the movement of gas is rotatably installed between the left plate and the right plate, and a motor for driving the active impeller to rotate is also fixed to the outer side of the left plate.

[0008] Furthermore, the air outlet is fixedly sleeved with an outer tube 1, and the inner cover of the outer tube 1 is provided with a closing cover that can be opened outwards.

[0009] Furthermore, the blocking part further comprises an annular sheet, the annular sheet is fixed to the outer end of the second outer tube, an inner tube is arranged inside the annular sheet, several groups of the collecting frames are circumferentially fixed to the outer side of the inner tube, the outer sides of several groups of the collecting frames are fixed to the annular sheet, and the outer ends of the collecting frames are flush with the outer ends of the annular sheet;

[0010] A rotating shaft is rotatably installed in the inner tube, and the outer end of the rotating shaft is fixed to the driven impeller, so that the moving gas from the air inlet can drive the driven impeller to rotate;

[0011] The three outer side surfaces and the inner end surface of the collecting frame are all provided with filter screens. The interior of the annular sheet is divided into a plurality of adjacent cavity openings 1 and 2 by a plurality of groups of the collecting frames. Cavity opening 1 is the outer end surface of the collecting frame. Cavity opening 2 is also provided with a filter screen. The driven impeller contacts the filter screen in cavity opening 2. The driven impeller is rotated to push the particles on cavity opening 2 into the collecting frame.

[0012] Furthermore, the second filter screen at the cavity opening is flush with the outer end surface of the annular sheet, and the filter screen is arranged in a stretched and straight manner.

[0013] Furthermore, four supporting shafts are provided between the two end surfaces of the collecting frame, and there are slits between the two supporting shafts close to the inner tube and the inner tube, and filters are also installed in the slits.

[0014] Furthermore, the blocking part further comprises an inner collecting part, which is rotatably arranged on the outer side of the inner tube, and the inner collecting part comprises a collecting sheet which is located in the collecting frame and can be scraped;

[0015] An outer ring is fixed to the inner end of the inner tube, a rotatable inner ring is clamped between the outer ring and the inner end of the inner tube, a clamping point for turning is fixed to the outer end of the inner ring, a connecting block is integrally formed at the inner end of the inner ring, an arc-shaped opening is provided at the inner end of the collecting frame, the connecting block passes through the arc-shaped opening and is fixed to the concentrating plate, and the clamping point is rotated to drive the concentrating plate to rotate inside the collecting frame.

[0016] Furthermore, the concentrating sheet is parallel to the axis of the inner tube, and is a metal sheet, and its windward surface is a blade surface.

[0017] Furthermore, a bayonet is provided on the outer side of one of the support shafts of the collection frame, and an elastically arranged arc-shaped piece is fixed on one side of the concentration piece, and the outer end of the arc-shaped piece is clamped into the bayonet.

[0018] Furthermore, a connecting shaft is fixed to the inner end of the rotating shaft, a scraper rod for moving the stuck point is sleeved on the connecting shaft, and a torsion spring for resetting is arranged between the scraper rod and the connecting shaft.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention can block particles and lint through the blocking portion of the air inlet of the volute body, protect the volute body and also have the effect of environmental protection, wherein the driven impeller scrapes along the filter screen of the cavity opening 2 to clean the filter screen of the cavity opening 2, and the scraped particles enter the collection frame and accumulate in the collection frame, and no additional driving force is required, ensuring that the filter screen of the cavity opening 2 always keeps air intake, and while collecting particles, the air intake volume is ensured to a certain extent;

[0020] Secondly, when the motor stops running, the air inlet has no suction, and the particles in the collection frame slide out along the filter of the collection frame to avoid accumulation. Running again can ensure the air intake while reducing the frequency of manual cleaning;

[0021] Under the rotation of the driven impeller, the connecting block moves along the arc-shaped mouth, and the concentrating sheet located inside the collecting frame also rotates, so that the particles inside the collecting frame are relatively concentrated, the filter permeability of the collecting frame is enhanced, and the blockage state is avoided, so that the air intake volume of the air inlet is relatively maintained, and under the continuous pushing action of the concentrating sheet, the particles and fluff are concentrated, and the filter permeability of the collecting frame is continuously maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the separation structure of the left side plate and the right side plate of the present invention;

[0025] Figure 3 It is a schematic diagram of the internal structure of the right side panel of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the filter screen hidden in the blocking part of the present invention;

[0027] Figure 5 It is a schematic diagram of the collection framework structure of the present invention;

[0028] Figure 6 1. It is a schematic diagram of a half-section structure of a collecting frame of the present invention viewed from above;

[0029] Figure 7It is a schematic diagram of the internal collecting part structure of the present invention;

[0030] Figure 8 The present invention Figure 7 A is a schematic diagram of the partially enlarged structure of the middle part;

[0031] Fig. 9 It is a schematic diagram of the separation structure of the collection frame and the internal collection part of the present invention.

[0032] In the figure: 1. volute body; 11. left side plate; 12. right side plate; 13. adsorption frame; 14. outer tube one; 15. closing cover; 2. active impeller; 3. motor; 4. outer tube two; 5. blocking part; 51. annular plate; 511. cavity opening one; 512. cavity opening two; 52. inner tube; 53. collecting frame; 531. supporting shaft; 532. slit; 533. arc-shaped opening; 534. bayonet; 54. rotating shaft; 55. driven impeller; 56. inner collecting part; 561. outer ring; 562. inner ring; 563. card point; 564. connecting block; 565. concentrating plate; 566. arc-shaped plate; 567. connecting shaft; 568. scraper rod. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-9 The present invention provides a technical solution: a vertical centrifugal volute structure, such as Figure 1 As shown, it includes a volute body 1, and the volute body 1 includes a left plate 11 and a right plate 12 that cooperate with each other. The left plate 11 and the right plate 12 are fixedly arranged, and air outlets are formed on the outer sides of the left plate 11 and the right plate 12, and the air outlets are used to discharge the adsorbed gas. An adsorption frame 13 is integrally formed on the outer side of the right plate 12, and the adsorption frame 13 is used to be installed at a position where adsorption is required to adsorb and transmit the gas. An air inlet is integrally formed on the inner side of the adsorption frame 13, and an outer tube 2 4 is fixed inside the air inlet. A blocking portion 5 for limiting particles is provided inside the outer tube 2 4. It should be noted that the air inlet is used for air intake, and the blocking portion 5 of the air inlet is used to limit particles, which can keep the air inlet from entering.

[0035] like Figure 4As shown, the particles are collected while avoiding blocking the air inlet. The blocking portion 5 includes a plurality of collecting frames 53 and a driven impeller 55 which are distributed in a circle. The driven impeller 55 is arranged on the outside of the plurality of collecting frames 53 to push the particles into the collecting frames 53. When the active impeller 2 rotates and the gas is sucked in from the air inlet, the driven impeller 55 is also driven to rotate under the action of the gas movement. The particles are pushed during the rotation of the driven impeller 55. It should also be noted that the incoming gas is relatively concentrated through the outer tube 24 to ensure that the driven impeller 55 is driven to rotate. The outer end of the outer tube 24 can also be connected to a tube body with a smaller diameter to increase the flow rate and ensure that the driven impeller 55 rotates. The reduced diameter is used to increase the flow rate of the gas and can be adjusted according to the requirements of the on-site environment. The diameter of the outer tube 24 can also be adjusted.

[0036] like Figure 2 As shown, during the operation of the volute body 1, the motor 3 and the active impeller 2 are indispensable, forming a complete component. An active impeller 2 for driving the gas movement is rotatably installed between the left plate 11 and the right plate 12, and a motor 3 for driving the active impeller 2 to rotate is also fixed on the outer side of the left plate 11.

[0037] The air outlet is fixedly sleeved with an outer tube 14, and the inner cover of the outer tube 14 is provided with a closing cover 15 which can be opened outwards. When blowing air outwards, it is in an open state, otherwise it is in a closed state, which can prevent impurities from entering the interior of the volute body 1.

[0038] like Figure 4 As shown, the blocking part 5 also includes an annular sheet 51, which is fixed to the outer end of the outer tube 2 4, and an inner tube 52 is arranged inside the annular sheet 51. Several groups of collecting frames 53 are circumferentially fixed to the outer side of the inner tube 52, and the outer sides of several groups of collecting frames 53 are fixed to the annular sheet 51. The outer ends of the collecting frames 53 are flush with the outer ends of the annular sheet 51. The flush arrangement can make the annular sheet 51 form a cavity 1 511 and a cavity 2 512 that are spaced apart, and can also keep the driven impeller 55 rotating to avoid jamming.

[0039] A rotating shaft 54 ​​is rotatably mounted in the inner tube 52, and the outer end of the rotating shaft 54 ​​is fixed to a driven impeller 55. The moving gas from the air inlet can drive the driven impeller 55 to rotate, and the driven impeller 55 is limited so that it can rotate.

[0040] like Figure 5As shown, the three outer side surfaces and the inner end surface of the collecting frame 53 are provided with filter screens, and the interior of the annular sheet 51 is divided into several adjacent cavity openings 511 and cavity openings 512 by several groups of collecting frames 53. Cavity opening 1 511 is the outer end surface of the collecting frame 53, and cavity opening 2 512 is also provided with a filter screen. The driven impeller 55 contacts the filter screen in cavity opening 2 512, and the driven impeller 55 is rotated to push the particles on cavity opening 2 512 into the collecting frame 53. It should be noted that the filter screen of the collecting frame 53 and the filter screen of cavity opening 2 512 completely seal the interior of the annular sheet 51, and the gas passing through the annular sheet 51 needs to pass through the filter screen of the collecting frame 53 or the filter screen of cavity opening 2 512. At the same time, during the scraping process of the driven impeller 55, the filter screen of cavity opening 2 512 is cleaned to maintain the filtering effect of the filter screen of cavity opening 2 512. In addition, the cleaned particles can move along the filter screen of cavity opening 2 512 to the filter screen of the collecting frame 53 to complete the collection.

[0041] The filter screen at cavity opening 512 is flush with the outer end surface of the annular sheet 51 and is stretched straight. It should be noted that the tensioning device can make the filter screen fit the driven impeller 55. In addition, the filter screen at cavity opening 512 is flush with the outer end surface of the annular sheet 51 and is also stretched straight.

[0042] like Figure 6 As shown, there are four support shafts 531 between the two end surfaces of the collecting frame 53, and there are slits 532 between the two support shafts 531 close to the inner tube 52 and the inner tube 52. A filter is also installed in the slit 532, so that the four sides of the collecting frame 53 are relatively closed by the filter to prevent impurities from passing through.

[0043] like Figure 8 As shown, in order to concentrate the particles inside the collecting frame 53 or maintain the permeability of the collecting frame 53, the blocking portion 5 further includes an inner collecting portion 56, which is rotatably arranged on the outside of the inner tube 52, and includes a concentrating sheet 565 which is located inside the collecting frame 53 and can be scraped;

[0044] An outer ring 561 is fixed to the inner end of the inner tube 52, and a rotatable inner ring 562 is clamped between the outer ring 561 and the inner end of the inner tube 52. A card point 563 for turning is fixed to the outer end of the inner ring 562, and a connecting block 564 is integrally formed at the inner end of the inner ring 562. An arc-shaped opening 533 is opened at the inner end of the collecting frame 53, and the connecting block 564 passes through the arc-shaped opening 533 and is fixed to the concentrating piece 565. The card point 563 is rotated to drive the concentrating piece 565 to rotate in the collecting frame 53. It should be noted that the clamped inner ring 562 closes the arc-shaped opening 533 to prevent particles or impurities from moving out of the arc-shaped opening 533. It should also be noted that the outer side of the arc-shaped opening 533 is blocked, so it has no suction, which to a certain extent prevents particles or fluff from entering the arc-shaped opening 533.

[0045] The concentrating sheet 565 is parallel to the axis of the inner tube 52. The concentrating sheet 565 is a metal sheet, and its windward surface is a blade surface. While letting in air, the concentrating sheet 565 is kept from being affected by the wind as much as possible.

[0046] A bayonet 534 is provided on the outer side of one of the support shafts 531 of the collecting frame 53, and an elastically arranged arc-shaped piece 566 is fixed on one side of the concentrating piece 565. The outer end of the arc-shaped piece 566 is clamped into the bayonet 534. After the concentrating piece 565 moves, the bending degree of the arc-shaped piece 566 increases, and subsequently, under the action of the arc-shaped piece 566, the concentrating piece 565 is restored.

[0047] A connecting shaft 567 is fixed to the inner end of the rotating shaft 54, and a scraper rod 568 for moving the stuck point 563 is sleeved on the connecting shaft 567. A torsion spring for resetting is provided between the scraper rod 568 and the connecting shaft 567. When the rotating shaft 54 ​​rotates, the scraper rod 568 abuts against the stuck point 563, pushing the stuck point 563 to rotate. After rotating to the maximum limit, the scraper rod 568 pushes the torsion spring to produce a tilting effect, so that the scraper rod 568 passes through the stuck point 563, and is subsequently reset under the action of the torsion spring.

[0048] The working principle of the present invention is as follows: the active impeller 2 is driven to rotate under the action of the motor 3, and the gas enters from the air inlet and is blown out from the air outlet. After the gas enters the interior of the volute body 1, local particles will also enter the interior, causing damage to the centrifugal volute. Therefore, the blocking part 5 at the air inlet of the volute body 1 can block the particles and fluff, so that the gas entering the volute body 1 is relatively clean, which protects the volute body 1 while also having an environmental protection effect.

[0049] The working principle of the blocking part 5 is as follows: the gas entering from the outer tube 2 4 passes through the blocking part 5, partially enters the interior of the collecting frame 53 from the cavity 1 511, and the other part is directly blocked on the filter screen of the cavity 2 512, so as to separate the particles from the gas. In addition, the driven impeller 55 also rotates under the action of the gas flow, and the driven impeller 55 scrapes along the filter screen of the cavity 2 512 to clean the filter screen of the cavity 2 512. At the same time, under the action of suction, the scraped particles enter the collecting frame 53 and accumulate in the collecting frame 53. No additional driving force is required, which can ensure that the filter screen of the cavity 2 512 always keeps air intake, collects the particles and ensures the air intake to a certain extent.

[0050] In addition, when the motor 3 stops running, the air inlet has no suction, so that the particles in the collection frame 53 slide out along the filter of the collection frame 53, avoiding the continuous accumulation of particles. Running again can ensure the air intake while reducing the frequency of manual cleaning.

[0051] When the driven impeller 55 drives the rotating shaft 54 ​​to rotate, the scraper rod 568 also rotates, pushing the card point 563, and rotating the inner ring 562, so that the connecting block 564 moves along the arc-shaped opening 533, and the concentrating sheet 565 located inside the collecting frame 53 also rotates, so that the particles located inside the collecting frame 53 are relatively concentrated, so that the permeability of the filter screen of the collecting frame 53 is enhanced, and the clogging state is avoided, so that the air intake of the air inlet is relatively maintained. It should be noted that the fluff has a stronger effect on the clogging of the filter screen, so that the fluff is concentrated. Under the condition of suction, the position of the concentrated fluff remains relatively unchanged, so that the filter screen has good air permeability.

[0052] After the scraper rod 568 pushes the stuck point 563 to the end, the scraper rod 568 produces a partial rotation under the action of the torsion spring, passes through the stuck point 563, and the focusing sheet 565 is restored under the action of the arc sheet 566, so that the focusing sheet 565 continuously pushes, concentrates the particles and fluff, and continuously maintains the filter permeability of the collection frame 53.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0054] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vertical centrifugal volute structure, comprising a volute body (1), characterized in that: The volute body (1) comprises a left side plate (11) and a right side plate (12) which cooperate with each other, the left side plate (11) and the right side plate (12) are provided with air outlets on their outer sides, the right side plate (12) is provided with an adsorption frame (13) integrally formed on its outer side, the adsorption frame (13) is provided with an air inlet integrally formed on its inner side, an outer tube 2 (4) is fixed inside the air inlet, and a blocking portion (5) for limiting the position of particles is provided inside the outer tube 2 (4); The blocking portion (5) comprises a plurality of circumferentially distributed collecting frames (53) and a driven impeller (55); the driven impeller (55) is arranged outside the plurality of groups of collecting frames (53) and is used to push particles into the collecting frames (53).

2. The vertical centrifugal volute structure according to claim 1, characterized in that: An active impeller (2) for driving the movement of gas is rotatably mounted between the left side plate (11) and the right side plate (12), and a motor (3) for driving the active impeller (2) to rotate is also fixed to the outer side of the left side plate (11).

3. The vertical centrifugal volute structure according to claim 1, characterized in that: The air outlet is fixedly sleeved with an outer tube 1 (14), and the inner cover of the outer tube 1 (14) is provided with a closing cover (15) that can be opened outwards.

4. The vertical centrifugal volute structure according to claim 1, characterized in that: The blocking portion (5) further comprises an annular sheet (51), the annular sheet (51) being fixed to the outer end of the second outer tube (4), an inner tube (52) being arranged inside the annular sheet (51), a plurality of groups of collecting frames (53) being fixed to the outer side of the inner tube (52) in a circumferential manner, the outer sides of the plurality of groups of collecting frames (53) being fixed to the annular sheet (51), and the outer ends of the collecting frames (53) being flush with the outer ends of the annular sheet (51); A rotating shaft (54) is rotatably mounted in the inner tube (52), and an outer end of the rotating shaft (54) is fixed to a driven impeller (55), so that the moving gas from the air inlet can drive the driven impeller (55) to rotate; The three outer side surfaces and the inner end surface of the collecting frame (53) are provided with filter screens. The interior of the annular sheet (51) is divided into a plurality of adjacent cavity openings (511) and cavity openings (512) by a plurality of groups of the collecting frames (53). The cavity opening (511) is the outer end surface of the collecting frame (53). The interior of the cavity opening (512) is also provided with a filter screen. The driven impeller (55) contacts the filter screen in the cavity opening (512). The driven impeller (55) is rotated to push particles on the cavity opening (512) into the collecting frame (53).

5. The vertical centrifugal volute structure according to claim 4, characterized in that: The filter screen at the second cavity opening (512) is flush with the outer end surface of the annular sheet (51), and the filter screen is arranged in a stretched and straight manner.

6. The vertical centrifugal volute structure according to claim 4, characterized in that: Four support shafts (531) are provided between the two end surfaces of the collecting frame (53), and a slit (532) is provided between the two support shafts (531) close to the inner tube (52) and the inner tube (52), wherein a filter screen is also installed in the slit (532).

7. The vertical centrifugal volute structure according to claim 4, characterized in that: The blocking portion (5) further comprises an inner collecting portion (56), the inner collecting portion (56) being rotatably disposed on the outer side of the inner tube (52), the inner collecting portion (56) comprising a collecting sheet (565) which is located inside the collecting frame (53) and is capable of scraping; An outer ring (561) is fixed to the inner end of the inner tube (52); a rotatable inner ring (562) is clamped between the outer ring (561) and the inner end of the inner tube (52); a clamping point (563) for shifting is fixed to the outer end of the inner ring (562); a connecting block (564) is integrally formed at the inner end of the inner ring (562); an arc-shaped opening (533) is formed at the inner end of the collecting frame (53); the connecting block (564) passes through the arc-shaped opening (533) and is fixed to the concentrating plate (565); the concentrating plate (565) is driven to rotate in the collecting frame (53) by rotating the clamping point (563).

8. The vertical centrifugal volute structure according to claim 7, characterized in that: The concentrating sheet (565) is parallel to the axis of the inner tube (52); the concentrating sheet (565) is a metal sheet, and its windward surface is a blade surface.

9. The vertical centrifugal volute structure according to claim 7, characterized in that: A bayonet (534) is provided on the outer side of one of the support shafts (531) of the collecting frame (53), and an elastically arranged arc-shaped piece (566) is fixed to one side of the concentrating piece (565), with the outer end of the arc-shaped piece (566) being clamped into the bayonet (534).

10. The vertical centrifugal volute structure according to claim 9, characterized in that: A connecting shaft (567) is fixed to the inner end of the rotating shaft (54), a scraper rod (568) for moving the blocking point (563) is sleeved on the connecting shaft (567), and a torsion spring for resetting is provided between the scraper rod (568) and the connecting shaft (567).

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