CN116280745A - Self-adaptive adjustment scraper supporting component for raw coal bunker - Google Patents

Abstract

The invention provides a scraper supporting component for self-adaptive adjustment of an original coal bunker, which comprises a coal bunker main body, wherein a plurality of first supporting devices which are arranged around the axis of the coal bunker main body are arranged in the coal bunker main body, a pushing device connected with the execution end of the first supporting devices, and a second supporting device connected with the execution end of the pushing device. The invention can drive the scraper to adapt to the inner wall of the coal bunker main body, so that the scraper can effectively guide raw coal on the inner wall of the coal bunker main body to fall.

Description

Self-adaptive adjustment scraper supporting component for raw coal bunker

Technical Field

The invention mainly relates to the technical field of raw coal conveying, in particular to a scraper supporting component capable of being adaptively adjusted for a raw coal bunker.

Background

Coal fired power plants mostly adopt raw coal bins to store coal between coal feeders, and raw coal often needs scraper devices to process caking on the inner wall of the coal bins in the conveying process, so that the raw coal bins are prevented from being blocked.

According to the cutter body structure for the raw coal bin blocking remover provided by the patent document with the application number of CN201721727382.3, the cutter body structure of the blocking remover comprises four middle rotary blades and two pairs of scrapers with the same structure, wherein one ends of the four middle rotary blades are uniformly fixed on the inner wall of a rotary bin body of the raw coal bin blocking remover through a cutter head; the two pairs of scrapers are symmetrical relative to the central axis of the raw coal bin block-removing machine and are connected through a connecting rod; the scraper comprises an upper cutter body and a lower cutter body; the upper cutter body and the lower cutter body are fixed on the inner wall of a rotary bin body of the raw coal bin block-removing machine through a cutter head; a plurality of upper auxiliary scrapers are arranged at the inner side of the upper cutter body; the upper part of the lower cutter body is a straight section, and the lower part is a bottom auxiliary cutter; a plurality of lower auxiliary scrapers are arranged on the inner side of the straight section of the lower cutter body. The anti-blocking and anti-blocking effects are remarkable, and the anti-blocking and anti-blocking agent is worthy of popularization.

The cutter body structure of the block removing machine improves the block removing effect of materials in a coal bin through the two scrapers, but when the scraper of the traditional block removing machine is lifted by the rib rod, the extrusion force of raw coal is large, so that the service life of the scraper is influenced.

Disclosure of Invention

The invention mainly provides a scraper supporting component for an original coal bunker, which is used for solving the technical problems in the background technology.

The technical scheme adopted for solving the technical problems is as follows:

the self-adaptive adjusting scraper supporting component for the raw coal bunker comprises a coal bunker main body, wherein a plurality of first supporting devices which are arranged around the axis of the coal bunker main body are arranged in the coal bunker main body, a pushing device which is connected with the execution end of the first supporting devices, and a second supporting device which is connected with the execution end of the pushing device are arranged in the coal bunker main body;

the coal bin main body comprises a coal conveying hopper used for fixing the first supporting device and a coal conveying cylinder connected with the lower surface of the coal conveying hopper through a flange;

the first supporting device comprises a hydraulic cylinder fixed on the inner wall surface of the top end of the coal conveying hopper, a rib rod connected with a piston rod of the hydraulic cylinder, and first scrapers fixed on two sides of the outer surface of the rib rod;

the second strutting arrangement include with pusher's execution end is connected the telescopic link, the cover is located the scraper box of telescopic link bottom, and with the telescopic link extends to the buffer gear that the inside one end of scraper box is connected, buffer gear's both sides are equipped with a plurality of second scrapers from top to bottom in proper order, the second scraper through the pivot with the scraper box is connected, the one end that buffer gear was kept away from to the second scraper runs through the scraper box and extends to outside.

Further, the pushing device comprises a groove arranged at the bottom end of the bar, a pushing rod inserted in the groove and rotationally connected with the groove body of the groove through a rotating shaft, and a hinge seat fixed on two sides of the bottom end of the pushing rod, wherein one end of the hinge seat, far away from the pushing rod, is rotationally connected with the telescopic rod through the rotating shaft, and two ends of the pushing rod are respectively connected with the bar and the telescopic rod, so that the telescopic rod is driven to slide along the inner wall of the coal conveying cylinder.

Further, the pushing device further comprises third scrapers fixed on two sides of the outer surface of the pushing rod, and raw coal in the coal bunker main body is driven to fall down through lifting of the third scrapers.

Further, the buffer gear is including being fixed in two deflector of scraper box inner wall surface, and locate two between the deflector and be fixed in the telescopic link extends to the buffer board of the inside one end of scraper box, the both sides surface of buffer board respectively with two deflector sliding connection, through the guide of deflector for the catch bar carries out linear displacement in the scraper box.

Further, the buffer mechanism further comprises a guide rod penetrating through four top angles of the guide plate, a first spring sleeved on the outer top end of the guide rod and propped against the upper surface of the buffer plate, and a second spring sleeved on the outer top end of the guide rod and propped against the lower surface of the buffer plate, wherein when the buffer plate ascends in the scraper box, energy is stored through the first spring, so that the scraper box stably moves in raw coal.

Further, a plurality of fourth scrapers are sequentially fixed on the surfaces of two sides of the scraper box from top to bottom, an opening for the penetration of the second scrapers is formed between two adjacent fourth scrapers, the length of the fourth scrapers is smaller than that of the second scrapers, and the second scrapers are bent between the two fourth scrapers through the second scrapers, so that the second scrapers with longer lengths and larger stressed areas are protected.

Further, the second supporting device further comprises a guiding mechanism arranged between the scraper box and the coal conveying cylinder, the guiding mechanism comprises a guiding hole arranged on one side surface of the scraper box, which is close to the inner wall of the coal conveying cylinder, and a guiding column inserted into the guiding hole, one end of the guiding column, which is far away from the guiding hole, is fixed on the inner wall surface of the coal conveying cylinder, and the guiding column on the inner wall of the coal conveying cylinder slides in the guiding hole of the scraper box, so that the scraper box is guided to lift along a straight line.

Further, the second supporting device further comprises a compression-resistant mechanism arranged inside the scraper box, the compression-resistant mechanism comprises a first steel wire rope fixed on the first spring shell and a second steel wire rope fixed on the second spring shell, the first steel wire rope and the second steel wire rope penetrate through the guide plate to be connected with the second scraper, and energy storage of the first spring and the second spring is utilized to buffer rotation of the second scraper.

Further, the second supporting device further comprises a mounting groove arranged at one end, close to the guide plate, of the second scraper, a first guide roller arranged inside the mounting groove and used for fixing the first steel wire rope and the second steel wire rope, and the second scraper is used for fixing the first steel wire rope or the second steel wire rope through the first guide roller in the mounting groove.

Further, the second strutting arrangement is still including locating on the deflector casing, and from top to bottom the through-hole that sets gradually, the inside of through-hole is fixed with two second deflector rolls from top to bottom in proper order, and through second deflector roll guide first wire rope or second wire rope remove, prevent to produce dry friction between first wire rope or second wire rope and the deflector.

Compared with the prior art, the invention has the beneficial effects that:

firstly, the scraper can be driven to adapt to the inner wall of the coal bunker main body, so that the scraper can effectively guide raw coal on the inner wall of the coal bunker main body to fall, and the method specifically comprises the following steps: the first scraper is driven to lift through the rib rod so as to push raw coal near the inner wall of the coal conveying hopper to fall through the first scraper in a mode of being attached to the inner wall of the coal conveying hopper, and the pushing device drives the scraper box to lift so as to drive the second scraper to lift, so that the second scraper pushes raw coal near the inner wall of the coal conveying barrel to fall in a mode of being attached to the inner wall of the coal conveying barrel.

Secondly, the invention can change the state of the scraper aiming at lifting of the scraper so that the scraper can adapt to extrusion of raw coal in the coal conveying cylinder, and the invention specifically comprises the following steps: when the second scraper descends to promote the raw coal whereabouts, second scraper and deflector looks butt to regard as the deflector to support, improve the stability that the raw coal was thrown away to the second scraper, when the second scraper risees, the second scraper uses its pivot on the scraper box to rotate as center of rotation, thereby reduces the extrusion dynamics of raw coal to the second scraper.

The invention will be explained in detail below with reference to the drawings and specific embodiments.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a first isometric view of a second support apparatus of the present invention;

FIG. 5 is a second isometric view of a second support apparatus of the present invention;

FIG. 6 is a first exploded view of the second support device of the present invention;

FIG. 7 is a second exploded view of the second support device of the present invention;

fig. 8 is an enlarged schematic view of the structure of the region a in fig. 7.

In the figure: 10. a coal bunker main body; 11. a coal conveying hopper; 12. a coal conveying cylinder; 20. a first support device; 21. a hydraulic cylinder; 22. a bar; 23. a first scraper; 30. a pushing device; 31. a groove; 32. a push rod; 33. a hinge base; 40. a second support device; 41. a telescopic rod; 42. a buffer mechanism; 421. a guide plate; 422. a buffer plate; 423. a guide rod; 424. a first spring; 425. a second spring; 43. a second scraper; 44. a guide mechanism; 441. a guide hole; 442. a guide post; 45. a compression-resistant mechanism; 451. a first wire rope; 452. a second wire rope; 453. a mounting groove; 454. a first guide roller; 455. a through hole; 456. a second guide roller; 46. a doctor blade box; 47. and a fourth scraper.

Detailed Description

In order that the invention may be more fully understood, a more particular description of the invention will be rendered by reference to the appended drawings, in which several embodiments of the invention are illustrated, but which may be embodied in different forms and are not limited to the embodiments described herein, which are, on the contrary, provided to provide a more thorough and complete disclosure of the invention.

It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to the other element, it may be directly connected to the other element or intervening elements may also be present, the terms "vertical", "horizontal", "left", "right" and the like are used herein for the purpose of illustration only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly connected to one of ordinary skill in the art to which this invention belongs, and the knowledge of terms used in the description of this invention herein for the purpose of describing particular embodiments is not intended to limit the invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1-8, an adaptively adjusted scraper supporting assembly for a raw coal bunker includes a coal bunker main body 10, wherein a plurality of first supporting devices 20 disposed around an axis of the coal bunker main body 10 are disposed inside the coal bunker main body 10, a pushing device 30 connected to an execution end of the first supporting devices 20, and a second supporting device 40 connected to an execution end of the pushing device 30;

the coal bunker main body 10 comprises a coal conveying hopper 11 for fixing the first supporting device 20 and a coal conveying barrel 12 connected with the lower surface of the coal conveying hopper 11 through a flange;

the first supporting device 20 comprises a hydraulic cylinder 21 fixed on the inner wall surface of the top end of the coal conveying hopper 11, a rib rod 22 connected with a piston rod of the hydraulic cylinder 21, and first scrapers 23 fixed on two sides of the outer surface of the rib rod 22;

the second supporting device 40 comprises a telescopic rod 41 connected with the execution end of the pushing device 30, a scraper box 46 sleeved at the bottom end of the telescopic rod 41, and a buffer mechanism 42 connected with one end of the telescopic rod 41 extending into the scraper box 46, wherein a plurality of second scrapers 43 are sequentially arranged on two sides of the buffer mechanism 42 from top to bottom, the second scrapers 43 are connected with the scraper box 46 through rotating shafts, and one end, far away from the buffer mechanism 42, of the second scrapers 43 extends to the outside through the scraper box 46.

Specifically, referring to fig. 3 and 4, the pushing device 30 includes a groove 31 provided at the bottom end of the bar 22, a pushing rod 32 inserted in the groove 31 and rotatably connected to the body of the groove 31 through a rotating shaft, and a hinge seat 33 fixed to two sides of the bottom end of the pushing rod 32, wherein one end of the hinge seat 33 far away from the pushing rod 32 is rotatably connected to the telescopic rod 41 through the rotating shaft, and the pushing device 30 further includes a third scraper 34 fixed to two sides of the outer surface of the pushing rod 32;

in this embodiment, the rod 22 is pushed by the piston rod of the hydraulic cylinder 21 to slide along the inner wall of the coal conveying hopper 11, the rod 22 drives the pushing rod 32 to move downward, and the two ends of the pushing rod 32 are respectively connected with the rod 22 and the telescopic rod 41, so that the telescopic rod 41 is driven to slide along the inner wall of the coal conveying barrel 12;

further, when the rib rod 22 translates under the driving of the piston rod of the hydraulic cylinder 21, the rib rod 22 drives the third scraper 34 thereon to lift, so as to drive the raw coal in the coal bunker main body 10 to fall through the lifting of the third scraper 34.

Specifically, referring to fig. 5, 6 and 7, the buffer mechanism 42 includes two guide plates 421 fixed on the inner wall surface of the doctor box 46, and a buffer plate 422 disposed between the two guide plates 421 and fixed on one end of the telescopic rod 41 extending into the doctor box 46, wherein two side surfaces of the buffer plate 422 are respectively slidably connected with the two guide plates 421, the buffer mechanism 42 further includes a guide rod 423 penetrating through four top corners of the guide plate 421, a first spring 424 sleeved on an outer top end of the guide rod 423 and abutting against an upper surface of the buffer plate 422, and a second spring 425 sleeved on an outer top end of the guide rod 423 and abutting against a lower surface of the buffer plate 422, a plurality of fourth doctor blades 47 are sequentially fixed on two side surfaces of the doctor box 46 from top to bottom, and insertion openings 48 for the second doctor blades 43 are disposed between two adjacent fourth doctor blades 47, and a length of the fourth doctor blades 47 is smaller than a length of the second doctor blades 43;

it should be noted that, in the present embodiment, when the pushing rod 32 is driven to lift by the rib rod 22, the rib rod 22 pushes the buffer plate 422 inside the doctor box 46 to move between the two guide plates 421, so that the pushing rod 32 is linearly displaced inside the doctor box 46 by the guidance of the guide plates 421;

further, when the buffer plate 422 descends in the scraper box 46, the buffer plate 422 buffers by the energy storage of the second spring 425, and the extruded second spring 425 pushes the scraper box 46 to descend continuously, so that the scraper box 46 can move stably in the raw coal, and in the same way, when the buffer plate 422 ascends in the scraper box 46, the buffer plate 422 moves stably in the raw coal by the energy storage of the first spring 424;

further, when the scraper box 46 is lifted under the driving of the telescopic rod 41, the scraper box 46 drives the fourth scraper 47 to lift, so that raw coal is pushed to fall through the fourth scraper 47, when the scraper box 46 is lifted to drive the second scraper 43 to bend, the opening 48 is shielded by the fourth scraper 47, raw coal is prevented from being blocked into the opening, and the second scraper 43 is bent between the two fourth scrapers 47, so that the second scraper 43 with long length and large stressed area is protected.

Specifically, referring to fig. 3 and 5, the second supporting device 40 further includes a guiding mechanism 44 disposed between the scraper box 46 and the coal conveying cylinder 12, the guiding mechanism 44 includes a guiding hole 441 disposed on a side surface of the scraper box 46 near the inner wall of the coal conveying cylinder 12, and a guiding post 442 inserted into the guiding hole 441, and one end of the guiding post 442 far from the guiding hole 441 is fixed on the inner wall surface of the coal conveying cylinder 12;

in the present embodiment, when the scraper box 46 is lifted, the scraper box 46 is guided to lift along a straight line by sliding the guide posts 442 on the inner wall of the coal conveying cylinder 12 in the guide holes 441 of the scraper box 46.

Specifically, referring to fig. 7 and 8, the second supporting device 40 further includes a compression mechanism 45 disposed inside the doctor box 46, the compression mechanism 45 includes a first wire rope 451 fixed on the housing of the first spring 424, a second wire rope 452 fixed on the second housing of the second spring 425, the first wire rope 451 and the second wire rope 452 both penetrate through the guide plate 421 to be connected with the second doctor 43, the second supporting device 40 further includes a mounting groove 453 disposed at one end of the second doctor 43 near the guide plate 421, a first guide roller 454 disposed inside the mounting groove 453 to fix the first wire rope 451 and the second wire rope 452, the second supporting device 40 further includes a through hole 455 disposed on the housing of the guide plate 421 and sequentially disposed from top to bottom, and two second guide rollers 456 are sequentially fixed inside the through hole 455 from top to bottom;

in this embodiment, when the second scraper 43 is extruded by the raw coal by following the rising of the scraper box 46, the second scraper 43 rotates around its rotation axis on the scraper box 46, and at this time, since the first spring 424 is connected to the second scraper 43 at the same level through the first wire rope 451, and the second spring 425 is connected to the second scraper 43 at the same level through the second wire rope 452, the two second scrapers 43 at the same side pull the first spring 424 and the second spring 425 respectively, so that the energy storage of the first spring 424 and the second spring 425 is utilized to provide buffering for the rotation of the second scraper 43;

further, the second scraper 43 fixes the first wire rope 451 or the second wire rope 452 by a first guide roller 454 in a mounting groove 453 thereof;

further, the guide plate 421 is penetrated by the first wire rope 451 or the second wire rope 452 through a gap formed between the two second guide rollers 456 in the through hole 455 thereof, so as to guide the first wire rope 451 or the second wire rope 452 to move through the second guide rollers 456, thereby preventing dry friction between the first wire rope 451 or the second wire rope 452 and the guide plate 421.

The specific operation mode of the invention is as follows:

when the coal bin main body 10 is used, raw coal enters through a feed inlet at the top end of the coal conveying hopper 11, sinks by gravity and enters the coal conveying cylinder 12, in the process, the hydraulic cylinder 21 is started, the rib rod 22 is pushed by a piston rod of the hydraulic cylinder 21 to slide along the inner wall of the coal conveying hopper 11, and the first scraper 23 is driven by the rib rod 22 to lift so as to push raw coal near the inner wall of the coal conveying hopper 11 to fall in a mode of being attached to the inner wall of the coal conveying hopper 11 through the first scraper 23;

the pushing rod 32 is driven to move downwards by the rib rod 22, and as the two ends of the pushing rod 32 are respectively connected with the rib rod 22 and the telescopic rod 41, the telescopic rod 41 is driven to slide along the inner wall of the coal conveying barrel 12, when the telescopic rod 41 pushes the buffer plate 422 to descend in the scraper box 46, the buffer plate 422 is buffered by the energy storage of the second spring 425, and the scraper box 46 is pushed to continue to descend by the extruded second spring 425, so that the scraper box 46 can still stably move in raw coal, and in the same way, when the buffer plate 422 ascends in the scraper box 46, the scraper box 46 stably moves in the raw coal by the energy storage of the first spring 424;

through the lift of scraper box 46 to drive second scraper 43 on it and go up and down, with the mode that makes second scraper 43 with laminating coal conveying section of thick bamboo 12 inner wall promote the raw coal near coal conveying section of thick bamboo 12 inner wall whereabouts, until raw coal discharges to the feeder from the discharge gate of coal conveying section of thick bamboo 12 bottom, when second scraper 43 descends with the raw coal whereabouts of promotion, second scraper 43 and deflector 421 butt, thereby regard deflector 421 as the support, improve the stability that second scraper 43 pushed away the raw coal, when second scraper 43 risees, second scraper 43 rotates with its pivot on scraper box 46 as the center of rotation, thereby reduce the extrusion dynamics of raw coal to second scraper 43.

While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the embodiments described above, but is intended to be within the scope of the invention, as long as such insubstantial modifications are made by the method concepts and technical solutions of the invention, or the concepts and technical solutions of the invention are applied directly to other occasions without any modifications.

Claims (10)

1. The self-adaptive adjusting scraper supporting assembly for the raw coal bunker comprises a coal bunker main body (10) and is characterized in that a plurality of first supporting devices (20) which are arranged around the axis of the coal bunker main body (10) are arranged in the coal bunker main body (10), a pushing device (30) connected with the execution end of the first supporting devices (20) and a second supporting device (40) connected with the execution end of the pushing device (30);

the coal bunker main body (10) comprises a coal conveying hopper (11) for fixing the first supporting device (20) and a coal conveying cylinder (12) connected with the lower surface of the coal conveying hopper (11) through a flange;

the first supporting device (20) comprises a hydraulic cylinder (21) fixed on the inner wall surface of the top end of the coal conveying hopper (11), a rib rod (22) connected with a piston rod of the hydraulic cylinder (21), and first scrapers (23) fixed on two sides of the outer surface of the rib rod (22);

the second supporting device (40) comprises a telescopic rod (41) connected with the execution end of the pushing device (30), a scraper box (46) sleeved at the bottom end of the telescopic rod (41) and a buffer mechanism (42) connected with one end inside the scraper box (46) extending to the telescopic rod (41), a plurality of second scrapers (43) are sequentially arranged on two sides of the buffer mechanism (42) from top to bottom, the second scrapers (43) are connected with the scraper box (46) through rotating shafts, and one end, far away from the buffer mechanism (42), of the second scrapers (43) extends to the outside through the scraper box (46).

2. The self-adaptive adjusting scraper supporting assembly for the raw coal bunker according to claim 1, wherein the pushing device (30) comprises a groove (31) arranged at the bottom end of the rib rod (22), a pushing rod (32) inserted in the groove (31) and rotationally connected with a groove body of the groove (31) through a rotating shaft, and hinge bases (33) fixed at two sides of the bottom end of the pushing rod (32), wherein one end of the hinge base (33) far away from the pushing rod (32) is rotationally connected with the telescopic rod (41) through the rotating shaft.

3. An adaptively adjusted doctor support assembly for a raw coal bunker as in claim 2, wherein said pushing means (30) further comprises third doctor blades (34) fixed to both sides of the outer surface of said pushing rod (32).

4. An adaptively adjusted scraper supporting assembly for a raw coal bunker according to claim 1, wherein said buffer mechanism (42) comprises two guide plates (421) fixed to the inner wall surface of said scraper box (46), and a buffer plate (422) provided between said two guide plates (421) and fixed to one end of said telescopic rod (41) extending to the inside of said scraper box (46), both side surfaces of said buffer plate (422) being slidably connected to said two guide plates (421), respectively.

5. The self-adaptive adjusting scraper supporting assembly for raw coal bunkers according to claim 4, wherein the buffer mechanism (42) further comprises a guide rod (423) penetrating through four top corners of the guide plate (421), a first spring (424) sleeved on the outer top end of the guide rod (423) and abutted against the upper surface of the buffer plate (422), and a second spring (425) sleeved on the outer top end of the guide rod (423) and abutted against the lower surface of the buffer plate (422).

6. The self-adaptive adjusting scraper supporting assembly for the raw coal bunker according to claim 1, wherein a plurality of fourth scrapers (47) are sequentially fixed on two side surfaces of the scraper box (46) from top to bottom, openings (48) for the penetration of the second scrapers (43) are formed between two adjacent fourth scrapers (47), and the length of the fourth scrapers (47) is smaller than that of the second scrapers (43).

7. The self-adaptive adjusting scraper supporting assembly for raw coal bunker according to claim 1, wherein the second supporting device (40) further comprises a guiding mechanism (44) arranged between the scraper box (46) and the coal conveying cylinder (12), the guiding mechanism (44) comprises a guiding hole (441) arranged on one side surface of the scraper box (46) close to the inner wall of the coal conveying cylinder (12), and a guiding column (442) inserted into the guiding hole (441), and one end of the guiding column (442) far away from the guiding hole (441) is fixed on the inner wall surface of the coal conveying cylinder (12).

8. The self-adaptive adjusting scraper supporting assembly for a raw coal bunker, as claimed in claim 5, wherein said second supporting device (40) further comprises a compression mechanism (45) arranged inside said scraper box (46), said compression mechanism (45) comprises a first steel wire rope (451) fixed on the casing of said first spring (424), a second steel wire rope (452) fixed on the second casing of said second spring (425), and said first steel wire rope (451) and said second steel wire rope (452) are connected with said second scraper (43) through a guide plate (421).

9. The self-adaptive adjusting scraper supporting assembly for the raw coal bunker, as claimed in claim 8, wherein said second supporting device (40) further comprises a mounting groove (453) arranged at one end of said second scraper (43) close to said guiding plate (421), and a first guide roller (454) arranged inside said mounting groove (453) for fixing said first wire rope (451) and said second wire rope (452).

10. The self-adaptive adjusting scraper supporting assembly for raw coal bunker according to claim 9, wherein the second supporting device (40) further comprises a through hole (455) which is arranged on the shell of the guide plate (421) and is sequentially arranged from top to bottom, and two second guide rollers (456) are sequentially fixed inside the through hole (455) from top to bottom.

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