Double-pan-head rack for drafting machine

文档序号:1166357 发布日期:2020-09-18 浏览:16次 中文

阅读说明:本技术 穿综机用双盘头机架 (Double-pan-head rack for drafting machine ) 是由 黄鼎辉 傅钢星 黄伟柯 于 2020-07-12 设计创作,主要内容包括:本发明专利公开了一种穿综机用双盘头机架,包括机架和活动机架,所述的活动机架上安装有第一纱线架和第二纱线架,第一纱线架包括第一夹纱框组和第四夹纱框组,第二纱线架包括第二夹纱框组和第三夹纱框组。本发明专利通过活动机架上安装有第一纱线架和第二纱线架,通过水平驱动装置、垂直升降装置、活动机架电动旋转装置,实现两个纱线架之间的水平移动,上下张紧,以及电动旋转的技术效果,提高了两个纱线架之间的位置调节性能,增加生产效率以及纱线夹持的张紧力调节。(The invention discloses a double-pan-head rack for a drafting machine, which comprises a rack and a movable rack, wherein a first yarn frame and a second yarn frame are arranged on the movable rack, the first yarn frame comprises a first yarn clamping frame group and a fourth yarn clamping frame group, and the second yarn frame comprises a second yarn clamping frame group and a third yarn clamping frame group. According to the invention, the first yarn frame and the second yarn frame are arranged on the movable rack, and the technical effects of horizontal movement, vertical tensioning and electric rotation between the two yarn frames are realized through the horizontal driving device, the vertical lifting device and the electric rotating device of the movable rack, so that the position adjusting performance between the two yarn frames is improved, the production efficiency is increased, and the yarn clamping tension force is adjusted.)

1. The utility model provides a double-disk head frame for drafting machine, includes frame (1) and movable rack (10), its characterized in that: the movable rack (10) is provided with a first yarn frame and a second yarn frame, the first yarn frame comprises a first yarn clamping frame group (20) and a fourth yarn clamping frame group (9), and the second yarn frame comprises a second yarn clamping frame group (19) and a third yarn clamping frame group (8).

2. The double pan head frame for a drafting machine according to claim 1, wherein: the second yarn frame moves horizontally relative to the first yarn frame through the horizontal driving device.

3. The double pan head frame for a drafting machine according to claim 1, wherein: a vertical lifting device is arranged between the first yarn clamping frame group (20) and the second yarn clamping frame group (19).

4. The double pan head frame for a drafting machine according to claim 1, wherein: an electric rotating device of the movable frame is arranged between the frame (1) and the movable frame (10).

5. The double pan head frame for a drafting machine according to claim 4, wherein: the electric rotating device of the movable rack comprises a motor (7) installed on a rack (1), the motor (7) is connected with a driving gear (11), the driving gear (11) is connected with a driven gear (15) through a chain (6), the chain (6) is connected with a chain connector (3) in the middle, one side edge of the chain connector (3) is connected with the movable rack (10), the other side edge of the chain connector is connected with a sliding plate roller (4), and the sliding plate roller (4) is embedded in a sliding groove (14) of a sliding plate (2).

6. The double pan head frame for a drafting machine according to claim 2, wherein: the horizontal driving device comprises a horizontal screw rod (54), the horizontal screw rod (54) is respectively connected with the movable rack (10) and a screw nut (52) on the horizontal moving connecting rod (18), the upper side and the lower side of the horizontal moving connecting rod (18) are respectively connected with a second yarn clamping frame (37) on the second yarn clamping frame group (19) and a third yarn clamping frame (38) on the third yarn clamping frame group (8) through horizontal connecting pieces (75), and screws on the two horizontal connecting pieces (75) respectively penetrate through a second horizontal groove (35) on the second yarn clamping frame seat (33) and a third horizontal groove (40) on the third yarn clamping frame seat (41).

7. The double pan head frame for a drafting machine according to claim 6, wherein: a second horizontal groove (35) on the second yarn clamping frame seat (33) is connected with a second yarn clamping frame (37) through a second sliding block (34); a third horizontal groove (40) on the third yarn clamping frame seat (41) is connected with the third yarn clamping frame (38) through a third sliding block (42).

8. The double pan head frame for a drafting machine according to claim 3, wherein: the vertical lifting device comprises a first yarn clamping frame group lifting device positioned at two ends of a first yarn clamping frame group (20) and a second yarn clamping frame group lifting device positioned at two ends of a second yarn clamping frame group (19); the first yarn clamping frame group lifting device comprises a first lifting screw rod (50) and a second lifting screw rod (58), the first lifting screw rod (50) is connected with a first lifting nut positioned on a first lifting seat (72), and the second lifting screw rod (58) is connected with a second lifting nut positioned on a second lifting seat (56); the second yarn clamping frame group lifting device comprises a third lifting screw rod (48) and a fourth lifting screw rod (80), the third lifting screw rod (48) is connected with a third lifting nut (73) positioned on a third lifting seat (71), and the fourth lifting screw rod is connected with a fourth lifting nut positioned on a fourth lifting seat (55); the peripheries of the first lifting screw rod (50) and the second lifting screw rod (58) are respectively provided with a first driving gear (66) connected by a chain; second driving gears (65) connected by chains are arranged on the peripheries of the third lifting screw rod (48) and the fourth lifting screw rod (80); the first lifting seat (72) and the second lifting seat (56) are respectively connected with the first yarn clamping frame group (20); the third lifting seat (71) and the fourth lifting seat (55) are respectively connected with the second yarn clamping frame group (19).

9. The double pan head frame for a drafting machine according to claim 8, wherein: a synchronous supporting driving device is arranged between the first yarn clamping frame group lifting device and the second yarn clamping frame group lifting device; the synchronous supporting driving device comprises a reinforcing rod (5) positioned in the middle of a movable rack (10), a connecting plate (77) is connected onto the reinforcing rod (5), a first vertical guide groove (79) and a second vertical guide groove (78) are respectively arranged on the connecting plate (77), and the first vertical guide groove (79) is formed by the first vertical guide groove (79)

The vertical sliding block is connected with a first supporting seat (74), the first supporting seat (74) is connected with a first yarn clamping frame set (20), the second vertical guide groove (78) is connected with a second supporting seat (51) through a second vertical sliding block, and the second supporting seat (51) is connected with a second yarn clamping frame set (19); the first supporting seat (74) is provided with a first supporting nut (81), the first supporting nut (81) is connected with a first synchronous chain (60) through a first supporting gear (62) on a first supporting screw rod (46), the first synchronous chain (60) is connected with a first driving gear (66) on the periphery of a second lifting screw rod (58), the periphery of the first supporting screw rod (46) is also provided with a first supporting pulley (83), and the first supporting pulley (83) is connected with the first driving gear (66) on the periphery of the first lifting screw rod (50) through a second synchronous chain (63); the second supporting seat (51) is provided with a second supporting nut (82), the second supporting nut (82) is connected with a third synchronous chain (59) through a second supporting gear (62) on a second supporting screw rod (47), the third synchronous chain (59) is connected with a second driving gear (65) on the periphery of a fourth lifting screw rod (80), a second supporting pulley (84) is further arranged on the periphery of the second supporting screw rod (47), and the second supporting pulley (84) is connected with the second driving gear (65) on the periphery of a second lifting screw rod (48) through a fourth synchronous chain (64).

10. The double pan head frame for a drafting machine according to claim 1, wherein: the first yarn clamping frame group (20) comprises a first yarn clamping frame (21), the first yarn clamping frame (21) is connected with a first yarn clamping rod (22) in a matched mode, the side edge of the first yarn clamping frame (21) is connected with a quick clamping device through a yarn clamping connecting block (23), the quick clamping device is connected with a clamping connecting sheet (25), the clamping connecting sheet (25) is connected with a carrier roller shaft bracket (36), and a carrier roller shaft (26) is mounted on the carrier roller shaft bracket (36); the rapid clamping device comprises a yarn clamping connecting seat (27) connected with a yarn clamping connecting block (23) and a clamping connecting seat (29) connected with a clamping connecting sheet (25), a clamping handle (31) is connected onto the clamping connecting seat (29) through a spring (30), the clamping handle (31) is connected with a clamping sleeve (28), and the clamping sleeve (28) is connected with a hook on the yarn clamping connecting seat (27).

Technical Field

The invention relates to the technical field of frames of heald threading machines, in particular to a double-pan-head frame for a drafting machine.

Background

The palm threading machine is a high-precision automation device for threading yarns on shaft heads into palm fiber sheets in sequence, the existing palm threading machine can only thread yarns on one shaft head into the palm fiber sheets in sequence, but cannot simultaneously thread the yarns on two shaft heads into the palm fiber sheets in sequence, and the reason is that the device for mutually separating and pushing the yarns on the two shaft heads is not used. The yarns on the two shaft heads penetrate into the palm fiber sheets in sequence, so that the arrangement sequence of different yarns on the palm fiber sheets can be greatly expanded, and the pattern and color change capability of yarn weaving is improved. The structural arrangement of two yarn carriers to form a double pan head frame, which is also required for yarns on two spindles, is the subject of investigation by those skilled in the art. In addition, the front and back positions of two yarn racks of the double-pan-head rack are required to be adjusted due to the fact that the yarn densities clamped on the two yarn racks are different, the technology does not have the background technology at present, belongs to a brand new technical problem, and needs to be solved by technical personnel in the field.

SUMMARY OF THE PATENT FOR INVENTION

The invention provides a double-pan-head rack for a drafting machine, which is suitable for two yarn shaft heads to form two yarn clamping layers.

The double-pan-head rack for the drafting machine comprises a rack and a movable rack, wherein a first yarn frame and a second yarn frame are mounted on the movable rack, the first yarn frame comprises a first yarn clamping frame group and a fourth yarn clamping frame group, and the second yarn frame comprises a second yarn clamping frame group and a third yarn clamping frame group.

The second yarn frame horizontally moves relative to the first yarn frame through the horizontal driving device. The double-pan-head rack disclosed by the invention is characterized in that two different pan-head (also called as a shaft head) warps are respectively clamped on a first yarn frame and a second yarn frame, and the two warp frames can move mutually, so that the production efficiency is greatly improved. The technical fault that the first yarn frame and the second yarn frame cannot move mutually is avoided.

And a vertical lifting device is arranged between the first yarn clamping frame group and the second yarn clamping frame group.

And an electric rotating device of the movable frame is arranged between the frame and the movable frame.

The electric rotating device of the movable rack comprises a motor installed on the rack, the motor is connected with a driving gear, the driving gear is connected with a driven gear through a chain, the chain is connected with a chain connector, one side edge of the chain connector is connected with the movable rack, the other side edge of the chain connector is connected with a sliding plate roller, and the sliding plate roller is embedded in a sliding groove of a sliding plate.

The horizontal driving device comprises a horizontal lead screw, the horizontal lead screw is respectively connected with the movable rack and a lead screw nut on the horizontal moving connecting rod, the upper side and the lower side of the horizontal moving connecting rod are respectively connected with a second yarn clamping frame on the second yarn clamping frame group and a third yarn clamping frame on the third yarn clamping frame group through horizontal connecting pieces, and screw rods on the two horizontal connecting pieces respectively penetrate through a second horizontal groove on the second yarn clamping frame seat and a third horizontal groove on the third yarn clamping frame seat.

A second horizontal groove on the second yarn clamping frame seat is connected with a second yarn clamping frame through a second sliding block; and a third horizontal groove on the third yarn clamping frame seat is connected with a third yarn clamping frame through a third sliding block.

The vertical lifting device comprises a first yarn clamping frame group lifting device positioned at two ends of the first yarn clamping frame group and a second yarn clamping frame group lifting device positioned at two ends of the second yarn clamping frame group; the first yarn clamping frame group lifting device comprises a first lifting screw rod and a second lifting screw rod, the first lifting screw rod is connected with a first lifting nut positioned on a first lifting seat, and the second lifting screw rod is connected with a second lifting nut positioned on a second lifting seat; the second yarn clamping frame group lifting device comprises a third lifting screw rod and a fourth lifting screw rod

The third lifting screw rod is connected with a third lifting nut positioned on the third lifting seat, and the fourth lifting screw rod is connected with a fourth lifting nut positioned on the fourth lifting seat; the peripheries of the first lifting screw rod and the second lifting screw rod are respectively provided with a first driving gear connected by a chain; second driving gears connected by chains are arranged on the peripheries of the third lifting screw rod and the fourth lifting screw rod; the first lifting seat and the second lifting seat are respectively connected with the first yarn clamping frame group; the third lifting seat and the fourth lifting seat are respectively

And connecting the second yarn clamping frame group.

A synchronous supporting driving device is arranged between the first yarn clamping frame group lifting device and the second yarn clamping frame group lifting device; the synchronous supporting driving device comprises a reinforcing rod positioned in the middle of the movable rack, a connecting plate is connected onto the reinforcing rod, a first vertical guide groove and a second vertical guide groove are respectively arranged on the connecting plate, the first vertical guide groove is connected with a first supporting seat through a first vertical sliding block, the first supporting seat is connected with a first yarn clamping frame group, the second vertical guide groove is connected with a second supporting seat through a second vertical sliding block, and the second supporting seat is connected with a second yarn clamping frame group; the first support seat is provided with a first support nut, the first support nut is connected with a first synchronous chain through a first support gear on a first support screw rod, the first synchronous chain is connected with a first driving gear on the periphery of a second lifting screw rod, the periphery of the first support screw rod is also provided with a first support pulley, and the first support pulley is connected with the first driving gear on the periphery of the first lifting screw rod through a second synchronous chain; the second supporting seat is provided with a second supporting nut and a second

The supporting nut is connected with a third synchronous chain through a second supporting gear on the second supporting screw rod, the third synchronous chain is connected with a second driving gear on the periphery of the fourth lifting screw rod, a second supporting pulley is further arranged on the periphery of the second supporting screw rod, and the second supporting pulley is connected with a second driving gear on the periphery of the second lifting screw rod through a fourth synchronous chain.

The first yarn clamping frame group comprises a first yarn clamping frame, the first yarn clamping frame is connected with a first yarn clamping rod in a matching mode, the side edge of the first yarn clamping frame is connected with a quick clamping device through a yarn clamping connecting block, the quick clamping device is connected with a clamping connecting sheet, the clamping connecting sheet is connected with a carrier roller shaft bracket, and a carrier roller shaft is mounted on the carrier roller shaft bracket; the quick clamping device comprises a yarn clamping connecting seat and a clamping connecting seat, the yarn clamping connecting seat is connected with the yarn clamping connecting block, the clamping connecting seat is connected with a clamping handle through a spring, the clamping handle is connected with a clamping sleeve, and the clamping sleeve is connected with a hook on the yarn clamping connecting seat.

According to the invention, the first yarn frame, the second yarn frame, the horizontal driving device, the vertical lifting device and the movable frame electric rotating device are arranged on the movable frame, so that the technical effects of horizontal movement, vertical tensioning and electric rotation between the two yarn frames are realized, and the position adjusting performance between the two yarn frames and the tension adjustment of yarn clamping are improved.

Drawings

FIG. 1 is a schematic view of a three-dimensional structure of a double-pan head frame for a drafting machine according to the present invention;

FIG. 2 is a schematic view of a double-pan-head frame for a drafting machine on the other side of the patent of the invention;

FIG. 3 is a schematic view of a double pan head frame exploded mounting structure for the drafting machine of the present invention;

FIG. 4 is a schematic perspective view of a movable frame according to the present invention;

FIG. 5 is a schematic view of a first yarn clamping frame set exploded installation structure in the patent of the invention;

FIG. 6 is a schematic structural view of a quick clamping device according to the present invention;

FIG. 7 is a schematic view of a second yarn clamping frame set exploded mounting structure in the patent of the invention;

FIG. 8 is a schematic view of a third clamping frame set exploded mounting structure in the patent of the present invention;

FIG. 9 is a perspective view of a fourth yarn clamping frame set according to the present invention;

FIG. 10 is a schematic view of the burst mounting structure of the movable frame of the present invention;

FIG. 11 is a schematic perspective view of a synchronous supporting driving device according to the present invention;

FIG. 12 is a schematic view of the exploded mounting structure of the horizontal driving device according to the present invention;

FIG. 13 is a schematic view of the turning structure of the movable frame and the frame according to the present invention;

fig. 14 is a schematic perspective view of a chain connector according to the present invention.

Detailed Description

As shown in fig. 1 to 14, the double pan head frame for the drafting machine comprises a frame 1 and a movable frame 10, wherein a first yarn frame and a second yarn frame are mounted on the movable frame 10, the first yarn frame comprises a first yarn clamping frame group 20 and a fourth yarn clamping frame group 9, and the second yarn frame comprises a second yarn clamping frame group 19 and a third yarn clamping frame group 8.

Preferably, the second yarn frame is horizontally moved relative to the first yarn frame by a horizontal driving device. The horizontal driving device comprises a horizontal screw rod 54, the horizontal screw rod 54 is respectively connected with the movable rack 10 and a screw nut 52 on the horizontal moving connecting rod 18, the upper side and the lower side of the horizontal moving connecting rod 18 are respectively connected with a second yarn clamping frame 37 on the second yarn clamping frame group 19 and a third yarn clamping frame 38 on the third yarn clamping frame group 8 through horizontal connecting pieces 75, and screw rods on the two horizontal connecting pieces 75 respectively penetrate through a second horizontal groove 35 on the second yarn clamping frame seat 33 and a third horizontal groove 40 on the third yarn clamping frame seat 41. The second horizontal groove 35 on the second yarn clamping frame seat 33 is connected with a second yarn clamping frame 37 through a second sliding block 34; a third horizontal groove 40 on the third yarn clamping frame seat 41 is connected with the third yarn clamping frame 38 through a third sliding block 42. The numbers of the third horizontal grooves 40, the third sliders 42, the second horizontal grooves 35 and the second sliders 34 are set as required in order to stabilize the driving. The horizontal driving device drives the horizontal screw rod 54 to rotate through the first wrench 16, so that the horizontal moving connecting rod 18 moves horizontally, and drives the second yarn clamping frame 37 and the third yarn clamping frame 38 to move horizontally, namely, drives the yarn layers clamped between the second yarn clamping frame 37 and the third yarn clamping frame 38 to move horizontally, and therefore the moving performance of the horizontal position between the yarn layers clamped by the first yarn frame and the second yarn frame is achieved. The yarn clamping rod 39 is matched with the third yarn clamping frame 38 to clamp the yarn.

In order to further improve the driving stability of the horizontal driving device, the balance rods 17 are installed at both sides of the horizontal screw 54, and the balance rods 17 are respectively connected with the movable frame 10 and the horizontal moving connecting rod 18. The balance bar 17 is connected with the horizontal moving connecting rod 18 through a bearing 53. A vertical adjusting sheet 45 is arranged between the horizontal moving connecting rod 18 and the second yarn clamping frame seat 33, an adjusting groove 76 is arranged on the vertical adjusting sheet 45, and the adjusting groove 76 is connected with the horizontal connecting sheet 75 through a screw rod in a matching manner so as to adjust the position height of the horizontal connecting sheet 75.

A vertical lifting device is arranged between the first yarn clamping frame group 20 and the second yarn clamping frame group 19. The vertical lifting device comprises a first yarn clamping frame group lifting device positioned at two ends of the first yarn clamping frame group 20 and a second yarn clamping frame group lifting device positioned at two ends of the second yarn clamping frame group 19.

The first clamping frame group lifting device comprises a first lifting screw rod 50 and a second lifting screw rod 58, the first lifting screw rod 50 is connected with a first lifting nut 69 on a first lifting seat 72, and the second lifting screw rod 58 is connected with a second lifting nut on a second lifting seat 56. The first lifting screw rod 50 and the second lifting screw rod 58 are provided with first driving gears 66 connected by chains at the periphery. The first lifting seat 72 and the second lifting seat 56 are respectively connected to the first yarn clamping frame set 20. The first lifting screw rod 50 and the second lifting screw rod 58 are driven to rotate by the third wrench 49 to realize the lifting of the first yarn clamping frame group.

The second yarn clamping frame group lifting device comprises a third lifting screw 48 and a fourth lifting screw 80, the third lifting screw 48 is connected with a third lifting nut 73 positioned on a third lifting seat 71, and the fourth lifting screw 80 is connected with a fourth lifting nut positioned on a fourth lifting seat 55. And a second driving gear 65 connected by a chain is arranged on the periphery of each of the third lifting screw rod 48 and the fourth lifting screw rod 80. The third lifting seat 71 and the fourth lifting seat 55 are respectively connected with the second yarn clamping frame set 19. The second wrench 94 drives the third lifting screw 48 and the fourth lifting screw 80 to rotate so as to lift the second yarn clamping frame group.

A synchronous supporting driving device is arranged between the first yarn clamping frame group lifting device and the second yarn clamping frame group lifting device. The synchronous supporting driving device comprises a reinforcing rod 5 positioned in the middle of the movable rack 10, a connecting plate 77 is connected onto the reinforcing rod 5, a first vertical guide groove 79 and a second vertical guide groove 78 are respectively arranged on the connecting plate 77, the first vertical guide groove 79 is connected with a first supporting seat 74 through a first vertical sliding block, the first supporting seat 74 is connected with a first yarn clamping frame set 20, the second vertical guide groove 78 is connected with a second supporting seat 51 through a second vertical sliding block, and the second supporting seat 51 is connected with a second yarn clamping frame set 19.

The first support seat 74 is provided with a first support nut 81, the first support nut 81 is connected with a first synchronization chain 60 through a first support gear 62 on the first support screw 46, the first synchronization chain 60 is connected with a first driving gear 66 on the periphery of the second lifting screw 58, the periphery of the first support screw 46 is further provided with a first support pulley 83, and the first support pulley 83 is connected with the first driving gear 66 on the periphery of the first lifting screw 50 through a second synchronization chain 63. The second support seat 51 is provided with a second support nut 82, the second support nut 82 is connected with a third synchronous chain 59 through a second support gear 62 on the second support screw 47, the third synchronous chain 59 is connected with a second drive gear 65 on the periphery of the fourth lifting screw 80, the periphery of the second support screw 47 is further provided with a second support pulley 84, and the second support pulley 84 is connected with the second drive gear 65 on the periphery of the second lifting screw 48 through a fourth synchronous chain 64. Therefore, a synchronous supporting driving device is formed, when the first supporting screw rod 46, the second lifting screw rod 58, the first lifting screw rod 50 and the other two screw rods of any screw rod can synchronously rotate to realize synchronous lifting of the first yarn clamping frame group, and similarly, the other two screw rods of the second supporting screw rod 47, the fourth lifting screw rod 80 and the second lifting screw rod 48 can synchronously rotate to realize synchronous lifting of the second yarn clamping frame group.

In order to further improve the lifting stability, the first lifting seat 72 is sleeved with the first guide column 67 through the first connecting block 68 and the third lifting seat 71 through the third connecting block 70. The fourth lifting seat 55 is sleeved with a second guide column 57 through a fourth connecting block 43 and a second connecting block 44 on the second lifting seat 56 to improve the lifting stability.

An electric rotating device of the movable frame is arranged between the frame 1 and the movable frame 10. The electric rotating device of the movable rack comprises a motor 7 installed on a rack 1, the motor 7 is installed on a motor base 12, the motor 7 is connected with a driving gear 11, the driving gear 11 is connected with a driven gear 15 through a chain 6, the chain 6 is connected with a chain connector 3 in the middle, the movable rack 10 is connected with one side edge of the chain connector 3, the other side edge of the chain connector is connected with a sliding plate roller 4, and the sliding plate roller 4 is embedded in a sliding groove 14 of a sliding plate 2. The movable frame 10 is driven by the motor 7 to rotate along the sliding groove 14 through the sliding plate roller 4 relative to the frame 1 so as to clamp the yarns.

In order to increase the service life of the chain 6, tensioning wheels 13 are arranged on the sides. A connecting rod 77 and a cylinder 78 are connected to the side of the movable frame 10 as a support structure.

In order to facilitate installation, the first yarn clamping frame group 20 comprises a first yarn clamping frame 21, the first yarn clamping frame 21 is connected with a first yarn clamping rod 22 in a matched mode, the side edge of the first yarn clamping frame 21 is connected with a quick clamping device through a yarn clamping connecting block 23, the quick clamping device is connected with a clamping connecting sheet 25, the clamping connecting sheet 25 is connected with a carrier roller shaft bracket 36, and a carrier roller shaft 26 is installed on the carrier roller shaft bracket 36. The quick clamping device 24 comprises a yarn clamping connecting seat 27 connected with the yarn clamping connecting block 23 and a clamping connecting seat 29 connected with the clamping connecting sheet 25, a clamping handle 31 is connected onto the clamping connecting seat 29 through a spring 30, the clamping handle 31 is connected with a clamping sleeve 28, the clamping sleeve 28 is connected with a hook on the yarn clamping connecting seat 27, and the quick connection of the first yarn clamping frame 21 and the roller shaft support 36 is realized through the clamping handle 31.

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