CN113925698B

CN113925698B - Active turning-over auxiliary bed for hemiplegic patient

Info

Publication number: CN113925698B
Application number: CN202111209704.6A
Authority: CN
Inventors: 赵静; 韩莹; 韩越; 其他发明人请求不公开姓名
Original assignee: Affiliated Hospital of University of Qingdao
Current assignee: Affiliated Hospital of University of Qingdao
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2022-11-11
Anticipated expiration: 2041-10-18
Also published as: CN113925698A

Abstract

The invention relates to the field of medical equipment, in particular to an active turning-over assisting bed for a hemiplegic patient, which comprises a bed body, wherein the insides of two sides of the bed body are respectively provided with a slideway, and a sliding mechanism is respectively arranged in the two slideways; the auxiliary mechanism comprises an arc-shaped auxiliary ring, a semi-arc-shaped force-borrowing semi-ring is arranged below the auxiliary ring, a gear box is fixedly arranged outside the middle section of the force-borrowing semi-ring, two sides of the gear box below the force-borrowing semi-ring are respectively provided with a wide hole, and the auxiliary ring penetrates through and is in sliding connection with the gear box; borrow power semi-ring below both sides and be provided with the helping hand slider respectively, be provided with the slip track that one side has the gear tooth between two helping hand sliders and connect, the slip track runs through the gear box through wide hole, utilize the annular moving mechanism who sets up in the external side of bed to make hemiplegia patient can carry out the recovered exercise of initiative and have better recovered environment after standing up around unmanned circumstances, simultaneously can gliding annular moving mechanism make can adapt to different patient's height.

Description

Hemiplegia patient initiatively stands up supplementary bed

Technical Field

The invention belongs to the field of medical equipment, and particularly relates to an active turning-over assisting bed for a hemiplegic patient.

Background

The hemiplegic patient can not move around, so that the hemiplegic patient can turn over for a long time, not only can prevent bedsore and other complicating symptoms, but also can help the patient to improve the reaction and the activity performance of the whole body, and further achieve the treatment effect;

the method of hiring a guardian is commonly adopted for the patient to turn over, the method is time-consuming and labor-consuming, the patient only needs to turn by himself to turn over the bed when the guardian leaves and the like, and the patient is not easy to recover due to the actions of communication, food taking and the like when the patient faces a bed plate baffle plate behind the turn over.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides an active turning-over assisting bed for hemiplegic patients, which can provide assistance when no protector is arranged beside the hemiplegic patients or the hemiplegic patients want to actively turn over and exercise and can move to the middle of the bed to facilitate the activities such as communication and the like.

In order to achieve the purpose, the invention adopts the following technical scheme:

an active turning-over assisting bed for hemiplegic patients comprises a bed body, wherein baffle rotating columns for turning over are horizontally arranged on two sides of the bed body, a bed side baffle is fixedly arranged above the baffle rotating columns, bed foot columns for supporting are respectively fixed in the vertical direction below two sides of the bed body, a bed tail plate is fixed in the vertical direction at the tail end of the bed body, a slide way is respectively arranged in the lower part of two sides of the bed body, and a sliding mechanism is respectively arranged in each of the two slide ways;

the auxiliary mechanism comprises an arc-shaped auxiliary ring, a semi-arc-shaped force-borrowing semi-ring is arranged below the auxiliary ring, a gear box is fixedly arranged outside the middle section of the force-borrowing semi-ring, two sides of the gear box below the force-borrowing semi-ring are respectively provided with a wide hole, and the auxiliary ring penetrates through the gear box and is in sliding connection with the gear box; the power assisting device is characterized in that two power assisting sliding parts are respectively arranged on two sides below the power assisting semi-ring, a sliding rail with gear teeth on one side is arranged between the two power assisting sliding parts, the sliding rail penetrates through the gear box through a wide hole, and a clamping mechanism is respectively fixed on one side, opposite to the lower end of each power assisting sliding part, of the lower end of each power assisting sliding part in the normal direction.

Preferably, each sliding mechanism comprises a sliding mechanism fixing column, a positioning cavity is formed in each sliding mechanism fixing column, a sliding block is arranged in each positioning cavity close to one end of the bed body, and each sliding block extends out of the sliding mechanism fixing column along the horizontal direction and is fixedly provided with a fixing block on the end face; every the sliding block is kept away from bed body one end horizontal direction and is fixed with a linkage post respectively, every the terminal vertical direction fork of linkage post, and every fork end is fixed with a lock post respectively, every lateral wall is provided with a spacing arch respectively about the location cavity, every be equipped with a sliding block spring at linkage post overcoat between sliding block and the spacing arch.

Preferably, one side of each sliding mechanism, which is far away from the bed body, is fixedly connected with a borrowing half ring respectively, two sides of each borrowing half ring are provided with a borrowing sliding groove along the arc direction respectively, the inner wall of one side of each borrowing sliding groove is provided with a power-assisted sliding groove, a power-assisted sliding part is arranged in each power-assisted sliding groove respectively, one side of each power-assisted sliding part, which is far away from the borrowing half ring, extends out of the borrowing sliding groove and is in an arc-shaped strip shape, each power-assisted sliding part extends out of the borrowing half ring and is internally provided with a sliding rail cavity, the sliding rail cavities at two sides are connected through a sliding rail, two ends of each sliding rail are arranged in the sliding rail cavities respectively, and the tail ends of each sliding rail are fixed with a reset spring; and one side of the outer part of each power-assisted sliding piece, which extends out of the power-assisted sliding groove and is close to the power-assisted semi-ring, is provided with a power-assisted ratchet.

Preferably, a handle fixing column is fixed on one side, close to the bed body, of each power-assisted sliding part along the normal direction of the power-assisted sliding part, a handle hand guard is fixed on one end, far away from the power-assisted semi-ring, of each handle fixing column, a sliding groove is formed in each of the upper side and the lower side of each handle fixing column between the power-assisted sliding part and the handle hand guard, a holding plate is arranged in each sliding groove, three separating springs are fixedly mounted on the end faces, opposite to each other, of the two holding plates on the same side, and each holding plate is connected with the ratchet arc-shaped plate column on the same side to achieve linkage.

Preferably, the end of the power-assisted sliding groove of the power-assisted semi-ring is provided with a groove near the middle, each groove is internally provided with a ratchet arc plate, one side surface of each ratchet arc plate near the power-assisted sliding part is provided with a power-assisted ratchet opposite to the power-assisted ratchet on the surface of the power-assisted sliding part in direction, each ratchet arc plate is provided with three ratchet arc plate columns along the normal direction in a circumferential array on one side surface of the power-assisted sliding part, and each ratchet arc plate column is externally sleeved with a ratchet arc plate reset spring respectively.

Preferably, one section centre gripping sliding tray has been seted up respectively to supplementary ring both sides inner wall, every be provided with fixture in the centre gripping sliding tray respectively, two a locked groove has been seted up respectively to centre gripping sliding tray lower extreme, every be provided with a locking lever in the locked groove respectively, every the locking lever is equipped with the fixture shell outward respectively the cover, every the cavity has been seted up respectively in the fixture shell and the locking lever overcoat inside the cavity is equipped with locking lever reset spring, the locking lever of both sides stretches out the fixture shell along opposite direction outside and is fixed with a fixed plate, it is spacing to offer the splint rotation space that is used for enlarging the home range between fixed plate and the fixture shell, every be provided with a splint rotation control respectively in the splint rotation space is spacing, splint rotation control both ends stretch out splint rotation space respectively outside and lower extreme fixed mounting have a splint, it makes splint rotatable to be provided with a splint rotation spring post between splint and the fixed plate.

Preferably, the slip track top is provided with a drive pinion, the drive pinion passes through gear engagement with the slip track and is connected, the drive pinion is provided with a driving gear axle through the middle part and fixes inside the gear box, the drive pinion top is provided with a driven gear wheel, driven gear wheel passes through gear engagement with the drive pinion and is connected, driven gear wheel is provided with a driven gear axle through the middle part and fixes inside the gear box, driven gear wheel one side is equipped with driven pinion in the outer supplementary ring below cover of driven gear axle, driven pinion passes through gear engagement with supplementary ring and is connected.

Advantageous effects

1. When no protector is around the hemiplegic patient or the hemiplegic patient needs to turn over actively to do exercises and other actions, the hemiplegic patient can do exercises and auxiliary rehabilitation by means of the force of the healthy arm on the equipment, and the labor intensity of the protector is reduced;

2. the sliding mechanisms arranged at the two sides of the bed are utilized to ensure that hemiplegic patients with different heights and different body types can adjust and adapt through external force, so that different patients can conveniently use the equipment to carry out active rehabilitation exercise and daily use;

3. in the process of turning over the patient actively, the bed sheet clamped in advance is pulled by the pulling mechanisms at the two sides of the bed, so that the patient can return to the middle of the bed without influencing the actions of eating, communication and the like of the patient, and a better rehabilitation environment is provided for the patient.

Drawings

FIG. 1 is a cross-sectional view of a front view of the present invention;

FIG. 2 is an enlarged schematic view of FIG. 1 at D;

FIG. 3 is an enlarged schematic view at E in FIG. 1;

FIG. 4 is an enlarged schematic view at F of FIG. 1;

FIG. 5 is an enlarged schematic view at G of FIG. 1;

in the figure: auxiliary ring 10, bed body 11, bed foot post 12, tailstock 13, clamping mechanism 15, handle fixing post 16, holding plate 17, handle hand guard 18, separating spring 19, bed side baffle 20, baffle rotating post 21, driving gear shaft 22, driving pinion 23, driven gearwheel 24, driven pinion 25, driven gear shaft 26, assisted half ring 27, sliding rail 28, assisted sliding piece 29, assisted sliding groove 30, assisted sliding groove 31, return spring 32, ratchet arc 33, ratchet arc post 34, ratchet arc return spring 35, assisted ratchet 36, assisted ratchet 37, clamping plate 38, clamping plate rotating spring post 39, clamping plate rotating control 40, clamping plate rotating space limit 41, fixing plate 42, clamping mechanism shell 43, locking rod 44, locking rod return spring 45, locking groove 46, auxiliary mechanism 47, sliding mechanism fixing post 48, positioning cavity 49, limit bump 50, sliding block 51, sliding block spring 52, linkage post 53, locking post 54, sliding rail cavity 55, sliding mechanism 56, gear box 57, wide hole 58, clamping sliding groove 59, and fixing block 60.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

In the description of the present invention, it should be noted that the terms "inside", "below", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention conventionally place when used, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

With reference to the attached drawing 1, an active turning-over auxiliary bed for hemiplegia patients comprises a bed body 11, wherein baffle rotating columns 21 for turning over are arranged on two sides of the bed body 11 in the horizontal direction, a bed side baffle 20 is fixedly arranged above the baffle rotating columns 21, bed foot columns 12 for supporting are respectively fixed in the vertical direction below two sides of the bed body 11, a bed tail plate 13 is fixed in the vertical direction at the tail end of the bed body 11, a slide way is respectively arranged in the lower part of two sides of the bed body 11, and sliding mechanisms 56 are respectively arranged in the two slide ways;

the auxiliary mechanism 47 comprises an arc-shaped auxiliary ring 10, a semi-arc-shaped force-borrowing semi-ring 27 is arranged below the auxiliary ring 10, a gear box 57 is fixedly arranged outside the middle section of the force-borrowing semi-ring 27, two sides of the lower part of the force-borrowing semi-ring 27 of the gear box 57 are respectively provided with a wide hole 58, and the auxiliary ring 10 penetrates through the gear box 57 and is in sliding connection with the gear box 57; two sides below the power-assisted semi-ring 27 are respectively provided with a power-assisted sliding part 29, a sliding rail 28 with gear teeth on one side is arranged between the two power-assisted sliding parts 29, the sliding rail 28 penetrates through a gear box 57 through a wide hole 58, and a clamping mechanism 15 is respectively fixed on one side of the lower ends of the two power-assisted sliding parts 29 along the normal direction.

Further, with reference to fig. 1 and fig. 2, each sliding mechanism 56 includes a sliding mechanism fixing column 48, a positioning cavity 49 is formed in each sliding mechanism fixing column 48, a sliding block 51 is disposed in each positioning cavity 49 and near one end of the bed 11, each sliding block 51 extends out of the sliding mechanism fixing column 48 along the horizontal direction, and a fixing block 60 is fixedly disposed on the end surface; a linkage column 53 is respectively fixed on one end of each sliding block 51 far away from the bed body 11 in the horizontal direction, the tail end of each linkage column 53 is forked in the vertical direction, a lock column 54 is respectively fixed on the tail end of each fork, a limiting protrusion 50 is respectively arranged on the upper side wall and the lower side wall of each positioning cavity 49, and a sliding block spring 52 is sleeved outside the linkage column 53 between each sliding block 51 and the limiting protrusion 50.

Further, with reference to fig. 1, one side of each sliding mechanism 56, which is away from the bed body 11, is fixedly connected with the borrowing half ring 27, two sides of the borrowing half ring 27 are respectively provided with a borrowing sliding groove 30 along an arc direction, the inner wall of one side of each borrowing sliding groove 30 is provided with a power-assisted sliding groove 31, each power-assisted sliding groove 31 is internally provided with a power-assisted sliding member 29, one side of each power-assisted sliding member 29, which is away from the borrowing half ring 27, extends out of the borrowing half ring 30 and is in an arc-shaped strip shape, each power-assisted sliding member 29 extends out of the borrowing half ring 27 and is internally provided with a sliding rail cavity 55, the sliding rail cavities 55 at two sides are connected through a sliding rail 28, two ends of the sliding rail 28 are respectively arranged in the sliding rail cavities 55, and the tail end of the sliding rail 28 is fixed with a return spring 32; and an assisting ratchet 37 is arranged on one side of the outer part of each assisting sliding piece 29, extending out of the assisting sliding groove 30 and close to the assisting semi-ring 27.

Further combine figure 1, every helping hand slider 29 is close to 11 one side of the bed body and is fixed with a handle fixed column 16 respectively along the normal direction of helping hand slider 29, every handle fixed column 16 is kept away from borrow power semi-ring 27 one end and is fixed with a handle hand protector 18 respectively, a spout has been seted up respectively to every handle fixed column 16 upper and lower both sides between helping hand slider 29 and handle hand protector 18, be provided with one respectively in every spout and grip the board 17, fixed mounting has three separation spring 19 on two relative terminal surfaces of gripping board 17 with same side, every gripping board 17 is connected with the ratchet arc shaped plate post 34 of homonymy respectively and is realized the linkage.

Further, with reference to fig. 1 and fig. 3, the power-assisted half ring 27 is provided with a groove near the middle of the end of the power-assisted sliding groove 30, each groove is provided with a ratchet arc 33, one side surface of each ratchet arc 33 near the power-assisted sliding member 29 is provided with a power-assisted ratchet 36 opposite to the direction of a power-assisted ratchet 37 on the surface of the power-assisted sliding member 29, each ratchet arc 33 is provided with three ratchet arc columns 34 far from the circumferential array of the surface of one side of the power-assisted sliding member 29 along the normal direction, and each ratchet arc column 34 is sleeved with a ratchet arc return spring 35.

Further, with reference to fig. 1, fig. 4, and fig. 5, two sections of clamping sliding grooves 59 are respectively formed on inner walls of two sides of the auxiliary ring 10, a clamping mechanism 15 is respectively disposed in each clamping sliding groove 59, a locking groove 46 is respectively formed at lower ends of the two clamping sliding grooves 59, a locking rod 44 is respectively disposed in each locking groove 46, a clamping mechanism shell 43 is respectively sleeved outside each locking rod 44, a cavity is respectively formed in each clamping mechanism shell 43, a locking rod return spring 45 is sleeved outside each locking rod 44 inside the cavity, the locking rods 44 on two sides extend out of the clamping mechanism shell 43 in opposite directions and are fixed with a fixing plate 42, a clamping plate rotation space limiting portion 41 for expanding a movement range is disposed between the fixing plate 42 and the clamping mechanism shell 43, a clamping plate rotation control 40 is respectively disposed in each clamping plate rotation space limiting portion 41, two ends of the clamping plate rotation control 40 respectively extend out of the clamping plate rotation space portion 41 and are fixedly mounted with a clamping plate 38 at a lower end, and a clamping plate rotation spring column 39 is disposed between the clamping plate 38 and the fixing plate 42 to enable the clamping plate 38 to rotate the clamping plate 38.

Further referring to fig. 1, a driving pinion 23 is disposed above the sliding rail 28, the driving pinion 23 is connected with the sliding rail 28 through gear engagement, the driving pinion 23 is disposed with a driving gear shaft 22 through the middle portion and fixed inside a gear box 57, a driven gearwheel 24 is disposed above the driving pinion 23, the driven gearwheel 24 is connected with the driving pinion 23 through gear engagement, the driven gearwheel 24 is disposed with a driven gear shaft 26 through the middle portion and fixed inside the gear box 57, a driven pinion 25 is sleeved below the auxiliary ring 10 outside the driven gear shaft 26 on one side of the driven gearwheel 24, and the driven pinion 25 is connected with the auxiliary ring 10 through gear engagement.

Principle of operation

Firstly, turning down the bed side baffle 20 at one side to enable a patient to lie on the bed body 11, then turning up the bed side baffle 20 to fix the patient to prevent the patient from falling, and clamping the sheet by using the fixing plates 42 and the clamping plates 38 arranged at two sides;

when a patient wants to actively perform turn-over rehabilitation training, the hand at the healthy side is lifted to hold the holding plate 17 at the healthy side, the holding plate 17 is pressed into the handle fixing column 16, and the ratchet arc plates 33 arranged at the two sides of the force-assisted half ring 27 along with the pressing of the holding plate 17 are pushed out under the action of the ratchet arc plate columns 34;

the patient then pushes the grip plate 17 upwards and to the desired height, wherein the patient is provided with a supporting force because the ratchet teeth arranged between the power-assisted slider 29 and the ratchet arc 33 are respectively oriented in different directions and thus cannot slide;

in the process that the patient pushes the holding plate 17, the sliding rail 28 is arranged in the power-assisted sliding part 29 and the movable range is limited, so that the patient can be pushed by the power-assisted sliding part 29 driven by the holding plate 17 and the driving pinion 23 arranged above the sliding rail 28 rotates, the driven gearwheel 24 meshed with the driving pinion 23 rotates due to the rotation of the driving pinion 23, the driven pinion 25 coaxial with the driven gearwheel 24 also rotates due to the rotation of the driven gearwheel 24 so that the auxiliary ring 10 rotates, therefore, the clamping mechanism shell 43 arranged on the healthy side moves in the circumferential direction driven by the auxiliary ring 10, the bed sheet on the healthy side is lifted to assist the patient in turning over, at the moment, the bed sheet 42 and the clamping plate 38 on the healthy side are stretched under the action of the locking groove 46 due to the disengagement of the locking rod 44 on the other side, so that the patient has a horizontal traction force in the turning over process to enable the patient to be still to be positioned near the midline of the bed, and the labor-saving effect is achieved in that the driving pinion 23 drives the larger driven gearwheel 24;

after turning over, the patient only needs to loosen the holding plate 17, the bouncing of the holding plate 17 enables the ratchet arc plates 33 arranged at the two sides of the force-aid half ring 27 to contract, the ratchets are not engaged any more, so that the power-assisted sliding piece 29 returns to the original position under the action of gravity and the return spring 32, and in the process, the auxiliary ring 10 is driven by the gear to rotate reversely to finally put down the bed sheet;

when the patient needs to turn over to the other side, the patient only needs to use the hand at the healthy side to hold the holding plate 17 at the sick side for the same operation.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by the present specification and drawings, or applied directly or indirectly to other related technical medical equipment fields, are included in the scope of the present invention.

Claims

1. An active turning-over auxiliary bed for hemiplegic patients comprises a bed body (11) and is characterized in that turning baffle rotating columns (21) are arranged on two sides of the bed body (11) in the horizontal direction, a bed side baffle (20) is fixedly installed above the baffle rotating columns (21), bed foot columns (12) for supporting are respectively fixed on the lower portions of two sides of the bed body (11) in the vertical direction, a bed tail plate (13) is fixed on the tail end of the bed body (11) in the vertical direction, a slide way is respectively arranged in the lower portions of two sides of the bed body (11), and sliding mechanisms (56) are respectively arranged in the two slide ways;

the auxiliary mechanism (47) comprises an arc-shaped auxiliary ring (10), a semi-arc-shaped force-borrowing semi-ring (27) is arranged below the auxiliary ring (10), a gear box (57) is fixedly installed outside the middle section of the force-borrowing semi-ring (27), two sides of the lower part of the force-borrowing semi-ring (27) of the gear box (57) are respectively provided with a wide hole (58), and the auxiliary ring (10) penetrates through the gear box (57) and is in sliding connection with the gear box (57); two sides below the force borrowing semi-ring (27) are respectively provided with a power assisting sliding piece (29), a sliding track (28) with a power assisting ratchet (37) on one side is arranged between the two power assisting sliding pieces (29), and the sliding track (28) penetrates through a gear box (57) through a wide hole (58);

each sliding mechanism (56) comprises a sliding mechanism fixing column (48), a positioning cavity (49) is formed in each sliding mechanism fixing column (48), a sliding block (51) is arranged in each positioning cavity (49) and close to one end of the bed body (11), each sliding block (51) extends out of the sliding mechanism fixing column (48) along the horizontal direction, and a fixing block (60) is fixedly arranged on the end face of each sliding block (51); a linkage column (53) is respectively fixed to one end, far away from the bed body (11), of each sliding block (51) in the horizontal direction, the tail end of each linkage column (53) is forked in the vertical direction, a lock column (54) is respectively fixed to the tail end of each fork, a limiting protrusion (50) is respectively arranged on the upper side wall and the lower side wall of each positioning cavity (49), and a sliding block spring (52) is sleeved on the linkage column (53) between each sliding block (51) and the limiting protrusion (50);

one side, far away from the bed body (11), of each sliding mechanism (56) is fixedly connected with a force-borrowing half ring (27), two sides of the force-borrowing half ring (27) are respectively provided with a force-borrowing sliding groove (30) along the arc direction, the inner wall of one side of each force-borrowing sliding groove (30) is provided with a power-assisting sliding groove (31), a power-assisting sliding piece (29) is arranged in each power-assisting sliding groove (31), one side, far away from the force-borrowing half ring (27), of each power-assisting sliding piece (29) extends out of the force-borrowing sliding groove (30) and is in an arc-shaped long strip shape, a sliding rail cavity (55) is formed in each power-assisting sliding piece (29) extending out of the force-borrowing half ring (27), the inner parts of the sliding rail cavities (55) on the two sides are connected through a sliding rail (28), two ends of the sliding rail (28) are respectively arranged in the sliding rail cavities (55), and the tail ends of the sliding rail cavities (28) are fixedly provided with a reset spring (32);

a handle fixing column (16) is respectively fixed on one side, close to the bed body (11), of each power-assisted sliding piece (29) along the normal direction of the power-assisted sliding piece (29), a handle hand guard (18) is respectively fixed on one end, far away from the power-assisted semi-ring (27), of each handle fixing column (16), sliding grooves are respectively formed in the upper side and the lower side of each handle fixing column (16), a holding plate (17) is respectively arranged in each sliding groove, three separating springs (19) are fixedly installed on the opposite end faces of the two holding plates (17) on the same side, and each holding plate (17) is respectively connected with the ratchet arc-shaped plate column (34) on the same side to realize linkage;

the assisting semi-ring (27) is provided with a groove at the tail end of an assisting sliding groove (30) close to the middle part, a ratchet arc-shaped plate (33) is arranged in each groove, one side surface of each ratchet arc-shaped plate (33) close to an assisting sliding part (29) is provided with an assisting ratchet (36) opposite to the direction of a surface assisting ratchet (37) of the assisting sliding part (29), a circumferential array of the surface of one side of each ratchet arc-shaped plate (33) far away from the assisting sliding part (29) is provided with three ratchet arc-shaped plate columns (34) along the normal direction, and a ratchet arc-shaped plate return spring (35) is sleeved outside each ratchet arc-shaped plate column (34);

the inner walls of two sides of the auxiliary ring (10) are respectively provided with a section of clamping sliding groove (59), each clamping sliding groove (59) is internally provided with a clamping mechanism (15), the lower ends of the two clamping sliding grooves (59) are respectively provided with a locking groove (46), each locking groove (46) is internally provided with a locking rod (44), each locking rod (44) is externally sleeved with a clamping mechanism shell (43), each clamping mechanism shell (43) is internally provided with a cavity, a locking rod reset spring (45) is sleeved outside the locking rod (44) in the cavity, the locking rods (44) on two sides extend out of the clamping mechanism shell (43) along opposite directions and are fixedly provided with a fixing plate (42), a clamping plate rotating space limiting space (41) for expanding the moving range is arranged between the fixing plate (42) and the clamping mechanism shell (43), each clamping plate rotating space limiting (41) is internally provided with a clamping plate rotating control (40), two ends of the clamping plate rotating control (40) respectively extend out of the clamping plate rotating space limiting (41) and the lower end of the clamping plate (38) is fixedly provided with a clamping plate (38), and a clamping plate (39) is arranged between the clamping plate rotating spring column (38);

sliding track (28) top is provided with a drive pinion (23), drive pinion (23) is connected through gear engagement with sliding track (28), drive pinion (23) is provided with a drive gear axle (22) through the middle part and fixes inside gear box (57), drive pinion (23) top is provided with a driven gear wheel (24), driven gear wheel (24) is connected through gear engagement with drive pinion (23), driven gear wheel (24) is provided with a driven gear axle (26) through the middle part and fixes inside gear box (57), driven gear wheel (24) one side is equipped with driven pinion (25) in the outer supplementary ring (10) below cover of driven gear axle (26), driven pinion (25) are connected through gear engagement with supplementary ring (10), and fixed plate (42) and splint (38) that both sides set up carry out the centre gripping to the sheet.