CN214416919U - Powder cleaning sieve for special feed for piglets - Google Patents

Abstract

The utility model relates to a powder clearance sieve of special fodder of piglet, relate to the field of feed processing equipment, it includes the support and is fixed in the casing of support, the inside of casing is provided with a sieve section of thick bamboo, the roof of casing is provided with the inlet pipe, the lateral wall of casing is provided with the debris discharging pipe, the diapire of casing is provided with thin material discharge hopper, the casing rotates and is connected with the axis of rotation, the casing is provided with actuating mechanism, the inside of a sieve section of thick bamboo is worn to locate by the axis of rotation coaxial line, the axis of rotation is provided with the rabbling mechanism that is used for stirring feed ingredient, the periphery wall fixed mounting of a sieve section of thick bamboo has vibrating motor, the periphery wall of a sieve section of thick bamboo is fixed with a plurality of connecting rods, the inner wall of casing is fixed with a plurality of dead levers, the periphery wall cover of connecting rod is equipped with vibrating spring, vibrating spring keeps away from the tip and the dead lever connection of connecting rod. This application has the difficult effect of blockking up of sieve mesh of a sieve section of thick bamboo, is favorable to promoting the speed and the efficiency of screening clearance, promotes the goodness of fodder, can reduce feed ingredient's waste simultaneously, reduction in production cost.

Description

Powder cleaning sieve for special feed for piglets

Technical Field

The application relates to the field of feed processing equipment, in particular to a powder cleaning sieve for a special feed for piglets.

Background

The feed raw materials contain sundries with larger particles, such as straws, ten pieces, hemp, paper sheets, conglomerations and the like. In order to improve the quality of the feed, the feed raw materials are generally preliminarily cleaned through a powder cleaning sieve, and large-particle impurities in the feed raw materials are screened out.

The current chinese patent with patent application number CN201721287011.8, a powder clearance sieve is proposed, relate to feed production technical field, which comprises a housing, the casing both ends are provided with feed inlet and big miscellaneous discharge gate respectively, the bottom of casing is equipped with the finished product discharge gate, be provided with a sieve section of thick bamboo in the inner chamber of casing, sieve section of thick bamboo below is equipped with detection device, detection device is including the sieve that is located finished product discharge gate top, the mesh internal diameter is greater than mesh internal diameter on the sieve section of thick bamboo on the sieve, still be provided with vibrating mechanism on the sieve, the one end that the sieve is close to the feed inlet is provided with the lifting cylinder, the other end is provided with the supporting seat, supporting seat one side is provided with the mechanism that gathers materials, it is provided with weighing sensor in the mechanism to gather materials, weighing sensor is connected with controller and the alarm device electricity of establishing in the casing outside.

In the related art, in the process of screening the feed raw materials, the feed raw materials are stacked at the bottom of the screen cylinder due to gravity, and the size of the separated part of the feed is close to the size of the screen holes of the screen cylinder, so that the screen holes of the screen cylinder are easy to block, and the inventor thinks that the defect that the screen holes of the screen cylinder are easy to block exists.

SUMMERY OF THE UTILITY MODEL

In order to improve the problem that the sieve mesh of a sieve section of thick bamboo is blockked up easily, this application provides a powder clearance sieve of special fodder of piglet.

The application provides a powder clearance sieve of special fodder of piglet adopts following technical scheme:

a powder cleaning sieve of special feed for piglets, which comprises a bracket and a casing fixed on the bracket, a screen drum is arranged inside the casing, a feed pipe is arranged on the top wall of the casing, a sundries discharge pipe is arranged on the side wall of the casing, the bottom wall of the shell is provided with a fine material discharging hopper, the shell is rotationally connected with a rotating shaft, the shell is provided with a driving mechanism for driving the rotating shaft to rotate, the rotating shaft is coaxially arranged in the sieve drum in a penetrating way, the rotating shaft is provided with a stirring mechanism for stirring feed raw materials, the peripheral wall of the screen drum is fixedly provided with a vibration motor, the peripheral wall of the screen drum is fixedly provided with a plurality of connecting rods, the inner wall of casing is fixed with a plurality of dead levers, the periphery wall cover of connecting rod is equipped with vibrating spring, vibrating spring keeps away from the tip of connecting rod with the dead lever is connected.

Through adopting above-mentioned technical scheme, when sifting the clearance to feed ingredient, actuating mechanism orders about the axis of rotation and rotates around its central axis, and then drive rabbling mechanism stirring feed ingredient, make feed ingredient and a sieve section of thick bamboo fully contact, vibrating motor orders about a sieve section of thick bamboo and takes place the vibration simultaneously, and constantly by tensile or compression through vibrating spring, further drive a sieve section of thick bamboo and take place the vibration, and then will be located the feed ingredient shake out the sieve mesh in the sieve section of thick bamboo sieve hole, avoid feed ingredient to block up at the sieve section of thick bamboo sieve mesh effectively and influence the speed and the efficiency of sifting the clearance, with this effect that the sieve mesh of realizing a sieve section of thick bamboo is difficult for blockking up, and separate feed ingredient and large granule debris high-efficiently, promote the goodness of fodder.

Optionally, the stirring mechanism includes a plurality of stirring boards and a plurality of L template, stirring board fixed connection in the axis of rotation, it is a plurality of the L template is respectively with a plurality of the stirring board is kept away from the tip elastic connection of axis of rotation.

Through adopting above-mentioned technical scheme, at axis of rotation pivoted in-process, the L template can be scraped piling up the feed ingredient in sieve bobbin base portion to spill feed ingredient evenly through centrifugal force, reduce piling up of feed ingredient in sieve bobbin base portion with this, further avoid the sieve mesh jam of sieve bobbin. Because the L-shaped plate is elastically connected with the stirring plate, the rigid collision between the L-shaped plate and the screen drum can be reduced, and the service life of the equipment can be prolonged.

Optionally, the stirring board is kept away from a plurality of movable slots have been seted up to the tip of axis of rotation, the end fixing of L template have a plurality ofly with the movable rod of movable slot adaptation that slides, the movable rod cover is equipped with buffer spring, buffer spring's one end is fixed in L template, the other end are fixed in the stirring board, the movable rod is provided with the restriction the movable rod slips out the locating part of stirring board.

Through adopting above-mentioned technical scheme, receive the collision back of a sieve section of thick bamboo at the L template, the movable rod slides and moves towards the stirring board along the length direction of activity groove, compresses buffer spring simultaneously, and then drives the L template and move towards the stirring board to this reduces the rigidity collision between L template and the sieve section of thick bamboo, and when the L template directly contact sieve section of thick bamboo not, buffer spring begins to kick-back and orders about the movable rod through elastic force and slides along the activity groove, resets until the L template.

Optionally, the limiting part is fixed in the limiting disc at the end of the movable rod, the stirring plate is provided with a limiting groove in the bottom wall of the movable groove, the limiting groove is matched with the limiting disc in a sliding manner, and the cross section of the limiting disc is larger than that of the movable rod.

Through adopting above-mentioned technical scheme, because spacing dish can't get into the activity inslot for the movable rod can't the sliding out activity groove, and then reduces the risk of L template and stirring board separation.

Optionally, a plurality of first through holes are formed in the stirring plate in a penetrating mode, a plurality of second through holes are formed in the L-shaped plate in a penetrating mode, and the inner diameter of each first through hole is larger than that of each second through hole.

Through adopting above-mentioned technical scheme, first through-hole and second through-hole are convenient for feed ingredient to pass for feed ingredient can fully contact with a sieve section of thick bamboo, is favorable to promoting screening clearance effect, reduces feed ingredient's waste. The inner diameter size of second through-hole is less for more feed ingredient who is located a sieve section of thick bamboo bottom can be scraped to the L template.

Optionally, the stirring board with the periphery wall of axis of rotation is tangent, just the corner of L template all sets up to the fillet.

Through adopting above-mentioned technical scheme, above-mentioned structural design's stirring board and L template can reduce the hindrance to the feed ingredient motion, and feed ingredient can be in a sieve section of thick bamboo free motion for feed ingredient and a sieve section of thick bamboo fully contact, are further favorable to promoting the screening clearance effect, reduce feed ingredient's waste.

Optionally, the upper surface of the bottom wall of the casing is fixed with inclined blocks on both sides of the fine material discharging hopper.

Through adopting above-mentioned technical scheme, the feed ingredient landing to the fine material hopper of the thin material hopper both sides of guide is gone out to the sloping block, fully collects the feed ingredient in the casing, reduces feed ingredient's waste.

Optionally, the driving mechanism comprises a driving motor, a synchronous belt, a first synchronous wheel and a second synchronous wheel, the driving motor is fixed on the support, an output shaft of the driving motor is fixed on the same axis of the first synchronous wheel, the second synchronous wheel is fixed on the same axis of the rotating shaft, and the synchronous belt is sleeved on the first synchronous wheel and the second synchronous wheel.

Through adopting above-mentioned technical scheme, order about first synchronizing wheel through driving motor and rotate to order about the axis of rotation through second synchronizing wheel and hold-in range and rotate, order about the effect that the axis of rotation rotated with this realization.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the vibrating motor drives the screen drum to vibrate, so that the vibrating spring is continuously contracted or stretched and further drives the screen drum to vibrate, and feed raw materials in screen holes of the screen drum are shaken out of the screen holes, and therefore the effect that the screen holes of the screen drum are not easy to block is achieved;

2. the rotating shaft is driven to rotate through the driving motor, the stirring plate and the L-shaped plate are driven to rotate, feed raw materials at the bottom of the screen cylinder are scraped, the feed raw materials are uniformly sprayed out through centrifugal force, and the feed raw materials freely move in the screen cylinder through the first through hole and the second through hole, so that the feed raw materials can be in contact with the screen cylinder, and the screening and cleaning effect is improved;

3. after the contact of L template and sieve section of thick bamboo, the movable rod slides along the activity groove and moves towards the stirring board, compresses buffer spring simultaneously to this rigidity collision that reduces L template and sieve section of thick bamboo is favorable to prolonging the life of equipment.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a schematic illustration in partial cross-sectional view of an embodiment of the present application;

FIG. 3 is a partial schematic structural view of a rotating shaft and a stirring mechanism according to an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3;

fig. 5 is a partially enlarged schematic view of a portion B in fig. 4.

Reference numerals: 1. a support; 11. mounting a plate; 2. a housing; 21. a feed inlet; 211. a feed pipe; 22. a sundry discharge port; 221. a sundry discharge pipe; 23. a fine material discharge port; 231. a fine material discharge hopper; 24. a rotating shaft; 25. a sloping block; 26. fixing the rod; 3. a screen cylinder; 31. a vibration motor; 32. a connecting rod; 321. a vibration spring; 33. a closing plate; 4. a drive mechanism; 41. a drive motor; 42. a synchronous belt; 43. a first synchronizing wheel; 44. a second synchronizing wheel; 5. a stirring mechanism; 51. a stirring plate; 511. a movable groove; 512. a limiting groove; 513. a first through hole; 52. an L-shaped plate; 521. a movable rod; 5211. a buffer spring; 5212. a limiting disc; 522. a second via.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a powder cleaning sieve for a special feed for piglets. Referring to fig. 1, the powder clearance sieve of special fodder of piglet includes support 1 and the casing 2 that is fixed in support 1, and support 1 includes the bracing piece of four cuboid shapes, and casing 2 is the cuboid shape that cavity set up, and four bracing pieces weld respectively in four corners of 2 diapire lower surfaces of casing.

Referring to fig. 1 and 2, a screen cylinder 3 is disposed inside the casing 2, and a closing plate 33 is welded to an end of the screen cylinder 3 having a larger outer diameter. The top wall of casing 2 has seted up feed inlet 21, and casing 2 is provided with inlet pipe 211 in feed inlet 21 department through the welding mode, and the one end of inlet pipe 211 is located in casing 2. The side wall of the casing 2 is provided with a sundries outlet 22, the casing 2 is provided with a sundries outlet pipe 221 at the sundries outlet 22 by welding, and the end part of the sundries outlet pipe 221 passes through the closing plate 33 and is positioned inside the screen cylinder 3. The fine material discharge port 23 that is located a sieve section of thick bamboo 3 below is seted up to the diapire of casing 2, and casing 2 is provided with fine material play hopper 231 through the welding mode in fine material discharge port 23 department. The diapire upper surface of casing 2 all is fixed with sloping block 25 through welding mode in the both sides of fine material play hopper 231, and sloping block 25 is triangle-shaped and inclined plane towards a sieve section of thick bamboo 3, and sloping block 25 can guide feed ingredient to remove to fine material play hopper 231. Inside feed ingredient got into sieve section of thick bamboo 3 by inlet pipe 211, the feed ingredient after the screening clearance left casing 2 by thin material hopper 231, debris left casing 2 by debris discharging pipe 221.

Referring to fig. 2 and 3, a rotating shaft 24 is rotatably connected to the housing 2, and both ends of the rotating shaft 24 are rotatably connected to two opposite sidewalls of the housing 2 through bearings, respectively. The rotary shaft 24 is cylindrical in shape and its axis is arranged in the horizontal direction, the rotary shaft 24 rotates around its central axis, and the housing 2 is provided with the drive mechanism 4 for driving the rotary shaft 24 to rotate. The rotating shaft 24 is coaxially inserted into the screen drum 3, and the rotating shaft 24 is provided with a stirring mechanism 5 for stirring the feed raw materials. The peripheral wall of a sieve section of thick bamboo 3 has vibrating motor 31 through bolt fixed mounting, and the peripheral wall of a sieve section of thick bamboo 3 is fixed with a plurality of connecting rods 32 through welding mode. The connecting rods 32 are arranged along the radial direction of the screen cylinder 3, the connecting rods 32 are provided with two groups and each group of connecting rods 32 is provided with eight, the two groups of connecting rods 32 are respectively positioned at two ends of the peripheral wall of the screen cylinder 3, and the four connecting rods 32 are uniformly arranged around the peripheral direction of the screen cylinder 3 at intervals. The inner wall of casing 2 is fixed with a plurality of dead levers 26 through the welding mode, and a plurality of dead levers 26 are coaxial with a plurality of connecting rods 32 respectively, and the periphery wall cover of connecting rod 32 is equipped with vibrating spring 321, and the tip that connecting rod 32 was kept away from to vibrating spring 321 is connected with dead lever 26. Drive axis of rotation 24 and 5 rotations of rabbling mechanism through actuating mechanism 4 for the inside feed ingredient of a sieve section of thick bamboo 3 fully contacts with a sieve section of thick bamboo 3, and vibrating motor 31 drives a sieve section of thick bamboo 3 and takes place the vibration simultaneously, and constantly tensile or compression vibrating spring 321, further drives the vibration of a sieve section of thick bamboo 3, reduces feed ingredient or debris of jam in a sieve section of thick bamboo 3 downthehole.

Referring to fig. 1 and 3, the driving mechanism 4 includes a driving motor 41, a timing belt 42, a first synchronizing wheel 43 and a second synchronizing wheel 44, the driving motor 41 is fixed to the support 1, an installation plate 11 is welded to an end of the support 1 away from the sundries discharging pipe 221, and the support 1 is fixedly connected to a top wall of the installation plate 11 through bolts. The output shaft of the drive motor 41 is parallel to the rotating shaft 24. The output shaft of the driving motor 41 is fixed coaxially with the first synchronizing wheel 43, and the output shaft of the driving motor 41 is in interference fit with the first synchronizing wheel 43. The second synchronizing wheel 44 is coaxially fixed with the rotating shaft 24, and the second synchronizing wheel 44 is in interference fit with the rotating shaft 24. The timing belt 42 is simultaneously sleeved on the first timing wheel 43 and the second timing wheel 44. The first synchronizing wheel 43 is driven to rotate by the driving motor 41, and the rotating shaft 24 is driven to rotate synchronously by the transmission of the first synchronizing wheel 43 with the timing belt 42 and the second synchronizing wheel 44.

Referring to fig. 3 and 4, the stirring mechanism 5 includes a plurality of stirring plates 51 and a plurality of L-shaped plates 52, and four stirring plates 51 and four L-shaped plates 52 are provided. The stirring plates 51 are fixedly connected to the rotating shaft 24 by welding, the stirring plates 51 are rectangular parallelepiped, the adjacent stirring plates 51 are perpendicular to each other, and the longitudinal direction of the stirring plates 51 is parallel to the axial direction of the rotating shaft 24. The L-shaped plates 52 are respectively and elastically connected with the end parts of the stirring plates 51 far away from the rotating shaft 24, and the L-shaped plates 52 can scrape the feed raw materials accumulated at the bottom of the screen drum 3 and uniformly spill the feed raw materials through centrifugal force, so that the accumulation of the feed raw materials at the bottom of the screen drum 3 is reduced. And the length dimension of the L-shaped plate 52 perpendicular to the axial direction of the rotating shaft 24 is increased along with the increase of the inner diameter dimension of the screen cylinder 3, so that the L-shaped plate 52 can more thoroughly scrape the feed raw materials accumulated at the bottom of the screen cylinder 3.

Referring to fig. 4 and 5, in order to allow the feed ingredients to freely move in the screen drum 3, a plurality of first through holes 513 are formed through the agitating plate 51 along the thickness direction thereof, a plurality of second through holes 522 are formed through the L-shaped plate 52 along the thickness direction thereof, and the inner diameter of each first through hole 513 is larger than that of each second through hole 522. The stirring plate 51 is tangent to the peripheral wall of the rotating shaft 24, and the corners of the L-shaped plate 52 are all set to be round corners. Above-mentioned structural design's L template 52 and stirring board 51 for feed ingredient can be in a sieve section of thick bamboo 3 free motion, and feed ingredient and a sieve section of thick bamboo 3 fully contact, further is favorable to promoting screening clearance effect, reduces feed ingredient's waste

Referring to fig. 4 and 5, in order to elastically connect the stirring plate 51 and the L-shaped plate 52, a plurality of movable grooves 511 are opened at an end of the stirring plate 51 away from the rotating shaft 24, notches of the movable grooves 511 face the L-shaped plate 52, and a length direction of the movable grooves 511 is parallel to a width direction of the stirring plate 51. A plurality of movable rods 521 which are matched with the movable groove 511 in a sliding manner are fixed at the end part of the L-shaped plate 52, the movable rods 521 are cylindrical, the axial direction of the movable rods 521 is parallel to the width direction of the stirring plate 51, and the movable rods 521 slide along the length direction of the movable groove 511. The movable rod 521 is sleeved with a buffer spring 5211, one end of the buffer spring 5211 is fixed to the L-shaped plate 52, the other end of the buffer spring 5211 is fixed to the stirring plate 51, and the movable rod 521 is provided with a limiting member for limiting the movable rod 521 to slide out of the stirring plate 51. When the L-shaped plate 52 collides with the screen cylinder 3, the movable rod 521 slides along the movable slot 511 and moves toward the bottom wall of the movable slot 511, so as to drive the L-shaped plate 52 to be close to the stirring plate 51, thereby reducing the rigid collision between the L-shaped plate 52 and the screen cylinder 3.

Referring to fig. 4 and 5, the position limiter includes a position limiting disc 5212 fixed to the end of the movable rod 521, the position limiting disc 5212 is in a disc shape, and the position limiting disc 5212 is coaxially welded to the end of the movable rod 521 located in the movable groove 511. The stirring plate 51 is provided with a limiting groove 512 on the bottom wall of the movable groove 511, the limiting groove 512 is in sliding fit with the limiting disc 5212, the length direction of the limiting groove 512 is consistent with the length direction of the movable groove 511, one end of the limiting groove 512 is communicated with the movable groove 511, the other end of the limiting groove 512 is arranged in a closed mode, and the limiting disc 5212 slides along the length direction of the limiting groove 512. The cross-sectional dimension of the limiting disc 5212 is larger than that of the movable rod 521, so that the limiting disc 5212 cannot enter the movable groove 511, and the risk of separation of the L-shaped plate 52 from the stirring plate 51 is reduced.

The implementation principle of the powder cleaning sieve for the special feed for the piglets in the embodiment of the application is as follows: when the feed raw materials are screened and cleaned, the driving motor 41 drives the first synchronizing wheel 43 to rotate, the rotating shaft 24 is driven to rotate around the central axis of the rotating shaft through transmission among the first synchronizing wheel 43, the second synchronizing wheel 44 and the synchronous belt 42, the stirring mechanism 5 is further driven to stir the feed raw materials, the feed raw materials are fully contacted with the screen cylinder 3, meanwhile, the vibrating motor 31 drives the screen cylinder 3 to vibrate, the screen cylinder 3 is continuously stretched or compressed through the vibrating spring 321, the screen cylinder 3 is further driven to vibrate, and the feed raw materials in the screen holes of the screen cylinder 3 are shaken out of the screen holes; simultaneously L template 52 can be scraped the feed ingredient who piles up in a sieve section of thick bamboo 3 bottom to spill feed ingredient evenly through centrifugal force, reduce piling up of feed ingredient in a sieve section of thick bamboo 3 bottom, the difficult effect of blockking up of sieve mesh with this realization sieve section of thick bamboo 3.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. A powder cleaning sieve of special fodder of piglet which characterized in that: comprises a bracket (1) and a casing (2) fixed on the bracket (1), a screen cylinder (3) is arranged in the casing (2), an inlet pipe (211) is arranged on the top wall of the casing (2), a sundries discharging pipe (221) is arranged on the side wall of the casing (2), a fine material discharging hopper (231) is arranged on the bottom wall of the casing (2), a rotating shaft (24) is rotatably connected with the casing (2), the casing (2) is provided with a driving mechanism (4) for driving the rotating shaft (24) to rotate, the rotating shaft (24) is coaxially arranged in the screen cylinder (3), the rotating shaft (24) is provided with a stirring mechanism (5) for stirring feed raw materials, a vibrating motor (31) is fixedly arranged on the peripheral wall of the screen cylinder (3), and a plurality of connecting rods (32) are fixed on the peripheral wall of the screen cylinder (3), the inner wall of casing (2) is fixed with a plurality of dead levers (26), the periphery wall cover of connecting rod (32) is equipped with vibrating spring (321), vibrating spring (321) are kept away from the tip of connecting rod (32) with dead lever (26) are connected.

2. The powder cleaning sieve of the special feed for piglets according to claim 1, which is characterized in that: rabbling mechanism (5) include a plurality of stirring board (51) and a plurality of L template (52), stirring board (51) fixed connection in axis of rotation (24), it is a plurality of L template (52) are respectively with a plurality of stirring board (51) are kept away from the tip elastic connection of axis of rotation (24).

3. The powder cleaning sieve of the special feed for piglets according to claim 2, which is characterized in that: keep away from stirring board (51) a plurality of movable groove (511) have been seted up to the tip of axis of rotation (24), the end fixing of L template (52) have a plurality ofly with movable rod (521) of movable groove (511) adaptation of sliding, movable rod (521) cover is equipped with buffer spring (5211), the one end of buffer spring (5211) is fixed in L template (52), the other end are fixed in stirring board (51), movable rod (521) are provided with the restriction movable rod (521) slides out the locating part of stirring board (51).

4. The powder cleaning sieve of the special feed for piglets according to claim 3, which is characterized in that: the locating part is including being fixed in spacing dish (5212) of movable rod (521) tip, stirring board (51) in spacing groove (512) have been seted up to the diapire of activity groove (511), spacing groove (512) with spacing dish (5212) adaptation that slides, the cross sectional dimension of spacing dish (5212) is greater than the cross sectional dimension of movable rod (521).

5. The powder cleaning sieve of the special feed for piglets according to claim 2, which is characterized in that: a plurality of first through holes (513) are formed in the stirring plate (51) in a penetrating mode, a plurality of second through holes (522) are formed in the L-shaped plate (52) in a penetrating mode, and the inner diameter size of the first through holes (513) is larger than that of the second through holes (522).

6. The powder cleaning sieve of the special feed for piglets according to claim 2, which is characterized in that: the stirring plate (51) is tangent to the peripheral wall of the rotating shaft (24), and corners of the L-shaped plate (52) are all provided with round corners.

7. The powder cleaning sieve of the special feed for piglets according to claim 1, which is characterized in that: the upper surface of the bottom wall of the machine shell (2) is fixed with inclined blocks (25) on two sides of the fine material discharging hopper (231).

8. The powder cleaning sieve of the special feed for piglets according to claim 1, which is characterized in that: actuating mechanism (4) include driving motor (41), hold-in range (42), first synchronizing wheel (43) and second synchronizing wheel (44), driving motor (41) are fixed in support (1), the output shaft of driving motor (41) with first synchronizing wheel (43) coaxial line is fixed, second synchronizing wheel (44) with axis of rotation (24) coaxial line is fixed, hold-in range (42) are located simultaneously first synchronizing wheel (43) with second synchronizing wheel (44).

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