CN201817635U

CN201817635U - Transmission mechanism for lifting knives of jacquard

Info

Publication number: CN201817635U
Application number: CN2010201842428U
Authority: CN
Inventors: 汪建兴; 施伯永
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-05
Filing date: 2010-05-05
Publication date: 2011-05-04
Anticipated expiration: 2020-05-05

Abstract

The utility model discloses a transmission mechanism for the lifting knives of a jacquard, which comprises a left wallboard, a right wallboard, an input shaft, a lifting knife device and the link mechanisms of eccentric wheels, wherein the input shaft is arranged in a way of penetrating through the left wallboard and the right wallboard, the lifting knife device is provided with two sets of knife carrier pairs with lifting knife groups, four pairs of link mechanisms of the eccentric wheels are positioned nearby each board and are transversely arranged above the corresponding knife carriers of the two knife carrier pairs, each link mechanism pair of the eccentric wheels comprises a pair of eccentric wheels, a pair of connecting rods and a pair of double-head levers, each pair of eccentric wheels is supported on the input shaft at an eccentric potential difference of 180 degrees, each pair of connecting rods is arranged in an inverted way, each pair of double-head levers is connected with the respective far ends of the connecting rods of a corresponding pair on the respective first lever arms of the double-head levers in a transmission way, and the respective second lever arms of each pair of double-head levers are connected with both ends of the corresponding knife carriers by lifting arms. Because of adopting the technical scheme, the device has compact structure, good dynamic balance of a longitudinal direction and a transverse direction, small vibration, small double-pattern weaving noise and good high-speed running state, is steady in running, is not easy to abrade and can be assembled into a jacquard with large needle number.

Description

Transmission mechanism for griffe of jacquard

[technical field]

The utility model relates to a kind of transmission mechanism for griffe of jacquard, is used to handle two groups of jacquard and griffes oppositely reciprocating motion each other, belongs to jacquard weave opening field of mechanical technique.

[background technology]

Known transmission mechanism for griffe of jacquard, generally adopt two pairs of two knife rests that are shaped as frame of totally four eccentric wheel connecting rod mechanism drivings, concrete structure is that the power shaft rotation is arranged on two wallboard bottoms, its two end is respectively installed a pair of eccentric wheel in each piece wallboard outside after running through wallboard, and two connecting rods of arranging in the same way of each suit, the far-end of these two connecting rods then links to each other with each bolster of the double-pendulum arms of two backswings each other respectively, the two ends of each double-pendulum arms are longly carried arm and weak point to carry arm and corresponding upper tool post one side and lower slide one side hinged one by one by one respectively, thereby be formed on wallboard two arranged outside and arrange that in the same way four connecting rods connect four double-pendulum arms, and two knife rest totally eight sides longly put forward the hinged one by one structure of each end that arm and four weak points are put forward arm and four double-pendulum arms by four, upper tool post and lower slide are fixed one respectively and are griffed group, and four eccentric wheels change into two groups of oppositely pumping of griffing with the continuous gyration of main shaft.The transmission mechanism for griffe of jacquard of this structure is owing to two pairs of eccentric wheels that are positioned at wallboard two outsides are arranged on two external parts of power shaft, so the pressure that two external parts of power shaft bear is comparatively concentrated, the torsion of power shaft is bigger, be unfavorable for that the speed of a motor vehicle promotes, and four connecting rods that the two pairs of eccentric wheels are adorned are arranged all in the same way, vertically dynamic balancing is relatively poor, there is the bigger deficiency of vibration in the weaving process, the inventor profoundly realizes by being engaged in Machine Design of jacquard weave opening and experience of site for many years: jacquard is vertical, horizontal dynamic balancing is very important, directly influence its operation stability, especially vertically dynamic balancing, such as the jacquard depth size basic fixed below 6144 gauge, the depth size of jacquard is far smaller than its lateral dimension, the vertical dynamically balanced quality of jacquard will directly have influence on the definition of shed open in the weaving process, especially under the high-speed cruising state, vertically, horizontal dynamically balanced quality can influence the service life of each movable parts of complete machine and the lifting of weaving efficiency.

In more detail; owing to griffe to be hung on harness cord elevating movement on the needle by drive; the harness cord of a jacquard is few to 4000; several ten thousand of as many as; its terminal steel that connects was combined after every harness cord passed the through hole of keevil; and place a warp on the harness eye that every steel is combined; when the jacquard dynamic balancing is not good; the harness cord severity of beating; rocking more greatly of harness cord then can aggravate harness eye and the excessive friction of warp and the through hole excessive friction of harness cord and keevil that steel is combined; warp cracked ends rate increases, and the outage rate height causes weaving defect rate and rises.

In view of this, the transmission mechanism for griffe of jacquard of existing structure is needed improvement badly.

[utility model content]

The technical problems to be solved in the utility model be overcome the deficiencies in the prior art and provide a kind of compact conformation, vertically, horizontal good dynamic balance, vibrate little, operate steadily and nonabradable transmission mechanism for griffe of jacquard, this transmission mechanism for griffe can be assembled into that large needle is counted jacquard and the high-speed cruising state is good.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

Transmission mechanism for griffe of jacquard, comprise left wallboard, right wallboard, power shaft, griffe device and eccentric wheel connecting rod mechanism, power shaft is set on left wallboard and the right wallboard rotationally, griffe device have two the cover knife rests right, two cover knife rests are to all being positioned at power shaft below and lateral arrangement near each side of two wallboards, and the right bottom of each knife rest is connected one group and griffes to organize.

The improvement of this case is: eccentric wheel connecting rod mechanism has four pairs and be positioned at separately near each wallboard respective side, and lateral arrangement is in the right corresponding knife rest top of two knife rests, each eccentric wheel connecting rod mechanism is to comprising a pair of eccentric wheel, pair of links and a pair of double end lever, each is 180 ° of eccentric potential difference supportings to eccentric wheel and is equipped on the power shaft, each is thereby that reversed arrangement constitutes front rod and back link to connecting rod, each to the double end lever on its first lever arm separately with tackle connecting rod far end activity separately mutually and connect, each then is connected with corresponding knife rest two ends by carrying arm double end lever second lever arm separately, so can be under the driving of power shaft, motion transmission by four pairs of eccentric wheel connecting rod mechanism, promptly be positioned at the two wallboards simultaneously outside pulling force of two pairs of connecting rods of two pairs of eccentric wheel connecting rod mechanism of side in the same way, driving a cover knife rest griffes to organize and moves downward together with being fixed in one it under (two knife rests), and be arranged in the two wallboards other remaining set simultaneously inside thrusts of two pairs of connecting rods of two pairs of eccentric wheel connecting rod mechanism of side in the same way, driving an other cover knife rest griffes to organize and moves upward together with being fixed in one it under (other two knife rests), so go round and begin again, thus realize two the cover knife rests to and interlock corresponding two griffe the group pump each other.

Wherein: eight double end levers all are fixed on the end face of pile crown separately, and each pile crown is installed on the close wallboard, article eight, four front rod equal in length in the connecting rod, and four back link equal in length in addition, article four, front rod is shorter than four back links, and reversed arrangement all, article four, be connected to and respectively griffe the arm lengths of putting forward of front end and equate, article four, be connected to and respectively griffe the arm lengths of putting forward of rear end and equate, and four be connected to respectively griffe front end carry arm than four be connected to respectively griffe the rear end to carry arm short, with four front rods be set with together be four identical small eccentricities wheels, with four back links be set with together be four identical large eccentricities wheels, four small eccentricities wheels are all 180 ° with the eccentric potential difference of four large eccentricities wheels.

This power shaft is suitable for linking to each other with a driving shaft at its place, any end, can control this device flexibly in a side or opposite side like this, so that suitable with all kinds of looms.

Two pairs of eccentric wheel connecting rod mechanism of two wallboard inboards between the power shaft position on be provided with shaft coupling.

The utility model compared with prior art has following beneficial effect:

1, one knife rest is to overlapping eccentric wheel connecting rod mechanism to driving by two, when power shaft rotates, because eccentric wobbler action, make two pairs of connecting rods that oppositely are provided with do reciprocal in opposite directions pushing away (drawing) motion simultaneously, article two, when front rod and two back links inwardly push away simultaneously, this knife rest is to moving upward synchronously on arriving to putting the position, and when two front rods and two back links are pulled outwardly simultaneously, this knife rest is to moving downward synchronously until arriving down to a position, before, two the connecting rod locking phases in back are cancelled each other to pushing away the inertia force that (drawing) motion produced, two groups of thrusts and two groups of pulling force all remain dynamic balancing, so each knife rest remains at optimum state to its vertical dynamic balancing in the process of pumping, correspondingly, in weaving process, warp few cracked ends rate of beating is low, and outage rate is low, the weaving efficiency height;

2, near each side of wallboard, be positioned at and evenly arrange eight eccentric wheels that all are mutually 180 ° of eccentric potential differences on the power shaft, to drive two cover knife rests to oppositely reciprocating motion each other, the resistance that weight produced that driving is carried on two groups of complete machine needles of griffing is evenly distributed on and takes up on the eccentric power shaft, this is equivalent to the principle of mechanical balance, no matter two groups of needles of griffing to hang with have multiple when weaving, can both divide equally substantially on the lever of power shaft the right and left, make to drive a knife rest when upwards moving two pairs of four thrusts that front-rear linkage produced and when driving another knife rest to downward motion two pairs of four pulling force that front-rear linkage produced guarantee that power shaft rotates reposefully, therefore two knife rests remain at optimum state to its horizontal dynamic balancing in the process that pumps each other, the mutual pressure of eight eccentric wheels and power shaft is minimum, power shaft torsion also reduces thereupon, can be under minimum energy consumption balance rotating, all movable parts wears of complete machine are few, operate steadily, little in the weaving process in the performance of lifting when flower noise, dispose and under fast state, move so more can adapt to the large needle number;

3, griffe to driving for two groups by near the eight cover eccentric wheel connecting rod mechanism of arranging each side of next-door neighbour's wallboard, this mechanism design is compact conformation not only, and eight connecting rods oppositely are provided with, form two pairs of balance thrusts and two pairs of balance pulling force, divide equally every connecting rod when push-and-pull is worked, then seem light and handy and power consumption again little, and it is little to divide the load of the big bearing of each eccentric wheel equally, not fragile, big bearing configuration requirement is low, adopts versatility standardization bearing to get final product, and need not use special bearing;

4, because the complete machine warp-wise, laterally dynamic balancing is good, in two groups are griffed to pump formed shed open open and close movement process, griffing to drive harness cord by needle pumps, harness cord connects steel and combines and then to drive warp and pump, no longer there are extra unnecessary friction in every the warp and the corresponding harness eye that are restrained in the comprehensive harness eye of each steel, so warp cracked ends rate is low, weaving efficiency height, percentage of A-class goods height;

5, suit shaft coupling on the power shaft, assemble easy to maintenance, the side that driving shaft is not installed need only unclamp shaft coupling, unclamp four carries being connected of arm and corresponding two knife rests, can a wallboard together with its both sides totally two eccentric wheel connecting rod mechanism carry out maintenance activity to unloading, and the installation exercise of maintenance after finishing.

[description of drawings]

Be described in further detail with regard to the utility model below in conjunction with accompanying drawing.

Fig. 1 shows the schematic perspective view of the utility model transmission mechanism for griffe of jacquard, and wherein, the inboard of the outside of left wallboard 20 and right wallboard 21 as seen;

Fig. 2 shows schematic perspective view of the present utility model, and wherein, the outside of the inboard and right wallboard 21 of left wallboard 20 as seen.

[specific embodiment]

Pressing, consult Fig. 1～shown in Figure 2, is preferred embodiment of the present utility model.Transmission mechanism for griffe of jacquard be equipped with comprise two groups of same sizes griffe to organize 80 and griffe to organize 90, griffe to organize 80 bars 50, bar 51 supportings by each the front and back side lower part that is fixed in knife rest 10, knife rest 11, griffe to organize 90 bars 52 by each the front and back side lower part that is fixed in knife rest 12, knife rest 13, bar 53 supportings, knife rest 10 and knife rest 12 and knife rest 11 and knife rest 13 lay respectively at the both sides of the left wallboard 20 and the right wallboard 21 of same size.

Griffe to organize 80 and griffe to organize 90 and be suitable for moving up and down each other, can make like this needle (not shown) they separately top dead center position and bottom dead center position between move, so that the mobile of warp on the harness eye that steel combines combined and be placed through to control by the steel that links to each other with harness cord, this point has been known in the jacquard weaving technical field.

Above four knife rests, power shaft 70 rotates and is arranged on left wallboard 20 and the right wallboard 21, power shaft 70 is by bearing (invisible) supporting that is installed on respectively on two wallboards, stretch out outside two wallboards at its both ends, left external part at power shaft 70 is connected with a driving shaft 60 of only being represented by its axis in Fig. 1, perhaps also can link to each other with driving shaft 60, specifically can answer the link position that requires configuration driven axle 60 of loom manufacturer at its place, opposite end (right external part).

Power shaft 70 is represented its continuous rotation direction by arrow R, and the rotation direction of power shaft 70 can be provided with, and need only turn to be complementary with the loom main shaft that is fitted together to get final product.

Large eccentricity wheel

32,42,33,43 size is all identical, eccentric direction is identical, and it is nearest from each wallboard,

small eccentricity wheel

30,40,31,41 size is all identical, eccentric direction is identical,

small eccentricity wheel

30,40,31,41 with

large eccentricity wheel

32,42,33,43 all are 180 ° with respect to the axis of power shaft 70 is equipped on the power shaft 70, front rod 300,400,310,410 equal in length, and install in the same way, back link 320,420,330,430 equal in length, and install in the same way, front rod 300,400,310,410 with back link 320,420,330,430 all are reversed arrangement, carry arm 303,403,313,413 is the length about equally of fine-tuning joint, carry arm 323,423,333,433 is the length about equally of fine-tuning joint, carry arm 303,403,313,413 all than carrying arm 323,423,333,433 is short, put forward the connector structure that arm is all a threaded rod and is equiped with bearing at its two ends, respectively carrying arm, to be arranged to fine-tuning purpose be to regulate the needs of griffing with the needle gap.Comprise identical two wallboards, identical two groups of a plurality of identical parts of griffing to organize, help saving during fabrication cost and highly versatile.

See also shown in Figure 1, one griffes to organize (80) is in lower position together with knife rest 10, knife rest 11, this a pair of knife rest can be under the driving of power shaft 70, and right motion transmission realizes being moved downward to lower position by means of being positioned at corresponding two eccentric wheel connecting rod mechanism in top, wherein:

The eccentric wheel connecting rod mechanism in wallboard 20 outsides, a left side is to the small eccentricity wheel 30 that comprises suit front rod 300, large eccentricity wheel 32, double end lever 301 and the double end lever 321 of suit back link 320, and a pair of eccentric wheel connecting rod mechanism of right wallboard 21 inboards is to the small eccentricity wheel 31 that comprises suit front rod 310, large eccentricity wheel 33, double end lever 311 and the double end lever 331 of suit back link 330.

Front rod 300 be equipped with by double end lever 301 be fixed in knife rest 10 front ends to carry arm 303 hinged, first lever arm 3010 of double end lever 301 is hinged with front rod 300, and its second lever arm 3011 is hinged with the upper end of carrying arm 303, double end lever 301 is fixed on the end face of pile crown 302, pile crown 302 has a supporting axle head and supplies bolting in the shaft shoulder in left wallboard 20 outsides, back link 320 be equipped with by double end lever 321 be fixed in knife rest 10 rear ends to carry arm 323 hinged, first lever arm 3210 of double end lever 321 is hinged with back link 320, and its second lever arm 3211 is hinged with the upper end of carrying arm 323, double end lever 321 is fixed on the end face of pile crown 322, and pile crown 322 has a supporting axle head and supplies bolting in the shaft shoulder in left wallboard 20 outsides; Front rod 310 be equipped with by double end lever 311 be fixed in knife rest 11 front ends to carry arm 313 hinged, first lever arm 3110 of double end lever 311 is hinged with front rod 310, and its second lever arm 3111 is hinged with the upper end of carrying arm 313, double end lever 311 is fixed on the end face of pile crown 312, pile crown 312 has a supporting axle head and supplies bolting in the shaft shoulder of right wallboard 21 inboards, back link 330 be equipped with by double end lever 331 be fixed in knife rest 11 rear ends to carry arm 333 hinged, first lever arm 3310 of double end lever 331 is hinged with front rod 330, and its second lever arm 3311 is hinged with the upper end of carrying arm 333, double end lever 331 is fixed on the end face of pile crown 332, and pile crown 332 has a supporting axle head and supplies bolting in the shaft shoulder of right wallboard 21 inboards.

See also shown in Figure 2, one griffes to organize (90) is in the high position together with knife rest 12, knife rest 13, this a pair of knife rest can be under the driving of power shaft 70, and right motion transmission realizes being moved upward to the high position by means of being positioned at corresponding two eccentric wheel connecting rod mechanism in top, wherein:

The eccentric wheel connecting rod mechanism of wallboard 20 inboards, a left side is to the small eccentricity wheel 40 that comprises suit front rod 400, large eccentricity wheel 42, double end lever 401 and the double end lever 421 of suit back link 420, and a pair of eccentric wheel connecting rod mechanism in right wallboard 21 outsides is to the small eccentricity wheel 41 that comprises suit front rod 410, large eccentricity wheel 43, double end lever 411 and the double end lever 431 of suit back link 430.

First lever arm 4010 (invisible among the figure) of double end lever 401 is hinged with front rod 400, and its second lever arm 4011 is connected with the front end of knife rest 12 by carrying arm 403, double end lever 401 is fixed on the end face of pile crown 402, pile crown 402 is installed on left wallboard 20 inboards, first lever arm 4210 of double end lever 421 is hinged with back link 420, and its second lever arm 4211 is connected with the rear end of knife rest 12 by carrying arm 423, double end lever 421 is fixed on the end face of pile crown 422, and pile crown 422 is installed on left wallboard 20 inboards; First lever arm 4110 of double end lever 411 is hinged with front rod 410, and its second lever arm 4111 is connected with the front end of knife rest 13 by carrying arm 413, double end lever 411 is fixed on the end face of pile crown 412, pile crown 412 is installed on right wallboard 21 outsides, first lever arm 4310 of double end lever 431 is hinged with back link 430, and its second lever arm 4311 is connected with the rear end of knife rest 13 by carrying arm 433, and double end lever 431 is fixed on the end face of pile crown 432, and pile crown 432 is installed on right wallboard 21 outsides.

By Fig. 2 and Fig. 1 as seen, power shaft 70 is to be formed by connecting by shaft coupling 701, shaft coupling 702 by three fulcrums to be the axon that can rotate continuously, shaft coupling 701 and shaft coupling 702 two pairs of eccentric wheel connecting rod mechanism of two wallboard inboards between.

Claims

1. transmission mechanism for griffe of jacquard, comprise left wallboard (20), right wallboard (21), power shaft (70), griffe device and eccentric wheel connecting rod mechanism, power shaft (70) is set on left wallboard (20) and the right wallboard (21) rotationally, griffing device has knife rest that two couple of driving and transmit by means of the eccentric wheel connecting rod mechanism motion by power shaft (70) pumps each other to (10,11) and knife rest to (12,13), knife rest is to (10,11) and knife rest to (12,13) be positioned at power shaft (10) below and lateral arrangement in each side of each wallboard, knife rest is to (10,11) bottom connects griffes to organize (80), knife rest is to (12,13) bottom connects griffes to organize (90), it is characterized in that described eccentric wheel connecting rod mechanism has four pairs, each eccentric wheel connecting rod mechanism is to being positioned near each side of each wallboard, and lateral arrangement in corresponding knife rest to (10,11) and knife rest to (12,13) top, each eccentric wheel connecting rod mechanism is to comprising a pair of eccentric wheel, pair of links and a pair of double end lever, each is 180 ° of eccentric potential difference supportings to eccentric wheel and is equipped on the power shaft (70), each is anti-phase layout to connecting rod, each to the double end lever on its first lever arm separately with tackle connecting rod far end activity separately mutually and connect, and each links to each other with corresponding knife rest two ends by carrying arm to double end lever second lever arm separately.

2. transmission mechanism for griffe of jacquard as claimed in claim 1 is characterized in that described power shaft (70) is suitable for linking to each other with a driving shaft (60) at its each place, end.

3. transmission mechanism for griffe of jacquard as claimed in claim 1 or 2, the eccentric wheel connecting rod mechanism that it is characterized in that left wallboard (20) outside is to comprising small eccentricity wheel (30), large eccentricity wheel (32), front rod (300), back link (320), double end lever (301) and double end lever (321), and the inboard a pair of eccentric wheel connecting rod mechanism of right wallboard (21) is taken turns (31), large eccentricity wheel (33), front rod (310), back link (330), double end lever (311) and double end lever (331) to comprising small eccentricity; The inboard eccentric wheel connecting rod mechanism of left side wallboard (20) is taken turns (42), front rod (400), back link (420), double end lever (401) and double end lever (421) to comprising small eccentricity wheel (40), large eccentricity, the a pair of eccentric wheel connecting rod mechanism in right wallboard (21) outside is to comprising small eccentricity wheel (41), large eccentricity wheel (43), front rod (410), back link (430), double end lever (411) and double end lever (431), wherein:

1), the eccentric direction of small eccentricity wheel (30,40,31,41) is identical, the eccentric direction of large eccentricity wheel (32,42,33,43) is identical, and small eccentricity wheel (30,40,31,41) all is 180 ° of eccentric potential difference supportings with large eccentricity wheel (32,42,33,43) relative power shafts (70) axis and is equipped on the power shaft (70);

2), front rod (300,310,400,410) homophase arranges that back link (320,330,420,430) homophase is arranged, front rod (300,310,400,410) and back link (320,330,420,430) reversed arrangement;

3), first lever arm (3010) of double end lever (301) flexibly connects with front rod (300), and its second lever arm (3011) links to each other with the front end of knife rest (10) by carrying arm (303), double end lever (301) is fixed on the end face of pile crown (302), pile crown (302) is installed on the left wallboard (20), first lever arm (3210) of double end lever (321) flexibly connects with back link (320), and its second lever arm (3211) links to each other with the rear end of knife rest (10) by carrying arm (323), double end lever (321) is fixed on the end face of pile crown (322), pile crown (322) is installed on the left wallboard (20), first lever arm (3110) of double end lever (311) flexibly connects with front rod (310), and its second lever arm (3111) links to each other with the front end of knife rest (11) by carrying arm (313), double end lever (311) is fixed on the end face of pile crown (312), pile crown (312) is installed on the right wallboard (21), first lever arm (3310) of double end lever (331) flexibly connects with back link (330), and its second lever arm (3311) links to each other with the rear end of knife rest (11) by carrying arm (333), double end lever (331) is fixed on the end face of pile crown (332), and pile crown (332) is installed on the right wallboard (21);

4), first lever arm (4010) of double end lever (401) flexibly connects with front rod (400), and its second lever arm (4011) links to each other with the front end of knife rest (12) by carrying arm (403), double end lever (401) is fixed on the end face of pile crown (402), pile crown (402) is installed on the left wallboard (20), first lever arm (4210) of double end lever (421) flexibly connects with back link (420), and its second lever arm (4211) links to each other with the rear end of knife rest (12) by carrying arm (423), double end lever (421) is fixed on the end face of pile crown (422), pile crown (422) is installed on the left wallboard (20), first lever arm (4110) of double end lever (411) flexibly connects with front rod (410), and its second lever arm (4111) links to each other with the front end of knife rest (13) by carrying arm (413), double end lever (411) is fixed on the end face of pile crown (412), pile crown (412) is installed on the right wallboard (21), first lever arm (4310) of double end lever (431) flexibly connects with back link (430), and its second lever arm (4311) links to each other with the rear end of knife rest (13) by carrying arm (433), double end lever (431) is fixed on the end face of pile crown (432), and pile crown (432) is installed on the right wallboard (21).

4. transmission mechanism for griffe of jacquard as claimed in claim 3 is characterized in that described small eccentricity wheel (30,40,31,41) is identical, and described large eccentricity wheel (32,42,33,43) is identical; The length of described front rod (300,310,400,410) is all equal, and the length of back link (320,330,420,430) is all equal, and front rod (300,310,400,410) is shorter than back link (320,330,420,430); The described arm (303,313,403,413) of carrying is the length about equally of fine-tuning joint, carry arm (323,333,423,433) and be the length about equally of fine-tuning joint, it is shorter than carrying arm (323,333,423,433) to carry arm (303,313,403,413).

5. transmission mechanism for griffe of jacquard as claimed in claim 1 or 2 is characterized in that described left wallboard (20) is identical with right wallboard (21).

6. transmission mechanism for griffe of jacquard as claimed in claim 1 or 2 is characterized in that also being provided with shaft coupling (701) and or shaft coupling (702) on power shaft (70) position between left wallboard (20) and the right wallboard (21).