CN113995595A

CN113995595A - Orthopedic traction rehabilitation nursing support

Info

Publication number: CN113995595A
Application number: CN202111456029.7A
Authority: CN
Inventors: 田智慧; 李艳华; 宁向君; 刘亚培
Original assignee: Second Affiliated Hospital of Luohe Medical College
Current assignee: Second Affiliated Hospital of Luohe Medical College
Priority date: 2021-12-01
Filing date: 2021-12-01
Publication date: 2022-02-01

Abstract

The invention discloses an orthopedic traction rehabilitation nursing support which comprises a rehabilitation nursing bed and a traction frame arranged at the right end of the rehabilitation nursing bed in a matching mode. The waist adjusting device is provided with the adjusting air bag, so that when the waist adjusting device is in actual use, the waist of a patient can be pressed through the adjusting air bag, and fatigue is relieved; the supporting mechanism is arranged, so that the height of the first bed board can be adjusted, and the medical staff can operate conveniently; through the setting of third regulating plate, the distance between two shank support can be adjusted, through being provided with the alignment jig, the rotation angle of adjustable single shank support adjusts simple and conveniently, is suitable for the use of the patient of different sizes.

Description

Orthopedic traction rehabilitation nursing support

Technical Field

The invention belongs to the technical field of biomedical instruments, and particularly relates to an orthopedic traction rehabilitation nursing support.

Background

In the rehabilitation and nursing of orthopedics department, traction is a commonly used treatment method in orthopedics department. An orthopedic traction frame is generally a pelvis frame group with double joints, telescopic traction arms and a rotary function so as to achieve better positioning requirements. The orthopedic traction frame is mainly used for performing various orthopedic operations such as traction, reduction, fixation and the like of lower limbs, and can perform lateral and horizontal traction and internal and external stretching of the limbs of a patient in the operation. When a patient lies on the orthopedic traction bed for a long time, the waist and the back of the patient can be uncomfortable; the height of the existing orthopedic traction bed is fixed and cannot be adjusted, so that the operation of medical care personnel is inconvenient; finally, the district is placed to the shank of traction frame, generally comprises two support bodies of rotating the connection, through adjusting the angle between two support bodies, adjusts the distance between two support bodies, and the distance of junction is fixed between two support bodies, can not adjust to the patient of the different sizes of not being convenient for uses.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide an orthopedic traction rehabilitation nursing support, which is provided with an adjusting air bag, so that when in actual use, the waist of a patient can be pressed by the adjusting air bag to relieve fatigue; the supporting mechanism is arranged, so that the height of the first bed board can be adjusted, and the medical staff can operate conveniently; through the setting of third regulating plate, the distance between two shank support can be adjusted, through being provided with the alignment jig, the rotation angle of adjustable single shank support adjusts simple and conveniently, is suitable for the use of the patient of different sizes.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:

an orthopedic traction rehabilitation nursing support comprises a rehabilitation nursing bed and a traction frame which is arranged at the right end of the rehabilitation nursing bed in a matching way;

the rehabilitation nursing bed comprises a first bed board and a second bed board which are sequentially connected from bottom to top, wherein supporting mechanisms are fixedly arranged at the left end and the right end of the lower bottom surface of the first bed board;

the center of the front side surface and the center of the rear side surface of the second bed board are respectively provided with a first mounting groove, two first sliding plates which are symmetrically arranged are connected in the first mounting grooves in a friction mode, the top surface of each first sliding plate is fixedly provided with a positioning column, the front end and the rear end of the top surface of the second bed board are respectively provided with two second mounting grooves which are matched with the positioning columns, the top surface of each positioning column is fixedly provided with a second sliding plate, and the top surface of each second sliding plate is fixedly provided with an adjusting air bag;

the right side surface of the first bed board is provided with a connecting frame in a matching way, and the connecting frame is fixedly connected with the traction frame;

the connecting frame comprises a first fixing column and cross-shaped columns fixedly arranged at two ends of the first fixing column, and a first connecting plate is fixedly arranged on the outer surface of the first fixing column;

a first adjusting plate is slidably mounted outside the cross-shaped column, a second adjusting plate is vertically mounted at one end, far away from the cross-shaped column, of the first adjusting plate, third threaded holes are formed in the left end and the right end of the front side face of the second adjusting plate, second bolts are connected in the third threaded holes in an internal thread mode, and fourth threaded holes matched with the second bolts are formed in the right ends of the front side face and the right end of the rear side face of the first bed board;

the traction frame comprises a second adjusting plate and a third adjusting plate fixedly mounted on the right side face of the second adjusting plate, first through grooves are formed in the front end and the rear end of the right side face of the third adjusting plate, a first sliding block is slidably mounted in the first through grooves, a first sliding rod and a second sliding rod are mounted at the upper end and the lower end of the first sliding block respectively, a second through groove and a third through groove communicated with the first through grooves are formed in the upper end and the lower end of the top face of the third adjusting plate respectively, the first sliding rod is slidably mounted in the second through grooves, the second sliding rod is slidably mounted in the third through grooves, a leg support is rotatably mounted at the upper end of the outer surface of the first sliding rod, and an adjusting frame is fixedly mounted on the lower bottom face of the second sliding rod;

first connecting plate right flank is opened there is the third mounting groove with second regulating plate matched with, fifth screw hole has all been opened at both ends around the second regulating plate top surface, fifth screw hole female connection has the third bolt, first connecting plate top surface is opened have two with third bolt matched with sixth screw hole, sixth screw hole is linked together with the third mounting groove.

Furthermore, the supporting mechanism comprises a U-shaped supporting frame and a moving frame which is arranged at the lower end of the U-shaped supporting frame in a matching manner;

the U-shaped support frame comprises a first support plate and second support plates vertically arranged at two ends of the first support plate, and the top surface of each second support plate is fixedly connected with the lower bottom surface of the first bed plate;

the moving frame comprises a third supporting plate, first mounting holes are formed in two ends of the third supporting plate, first connecting columns are fixedly mounted in the first mounting holes, second connecting columns are fixedly mounted on the top surfaces of the first connecting columns, and moving wheels are mounted on the lower bottom surfaces of the first connecting columns in a matched mode;

the center of the top surface of the third supporting plate is provided with two symmetrically-arranged second mounting holes, third connecting columns are fixedly mounted in the second mounting holes, and the top surface of the first supporting plate is provided with two third mounting holes matched with the third connecting columns;

the top surface center of the second supporting plate is provided with a fourth mounting hole matched with the second connecting column, the lower end of the front side surface of the second supporting plate is provided with two first threaded holes which are symmetrically arranged, the first threaded holes are in threaded connection with first bolts, and the side surface of the second connecting column is uniformly provided with a row of second threaded holes matched with the first bolts.

Furthermore, a hydraulic push rod is fixedly mounted at the front end of the first through groove, and the output end of the hydraulic push rod is fixedly connected with the first sliding block.

Further, the leg support comprises a leg placing plate, and a first placing hole matched with the first sliding rod is formed in the left end of the top surface of the leg placing plate;

a placing long groove is formed in the front side face of the leg placing plate, a hydraulic rod is fixedly mounted at the left end of the placing long groove, a second sliding block is fixedly mounted at the output end of the hydraulic rod, a third sliding block is fixedly mounted on the front side face of the second sliding block, a seventh threaded hole is formed in the center of the top face of the third sliding block, a rotating threaded rod is connected with the seventh threaded hole in an internal thread mode, a first pedal is fixedly mounted at the top of the rotating threaded rod, a second pedal is vertically mounted at the right end of the top face of the first pedal, and connecting binding bands are fixedly mounted at the upper end and the lower end of the rear side face of the second pedal;

the center of the lower bottom surface of the leg placing plate is fixedly provided with a telescopic rod;

the adjusting frame comprises an arc-shaped disc, the lower bottom surface of the second sliding rod is fixedly connected with the arc-shaped disc, and second placing holes matched with the telescopic rods are uniformly distributed in the edge of the top surface of the arc-shaped disc along the circumferential direction.

The invention has the beneficial effects that:

1. the waist adjusting device is provided with the adjusting air bag, so that when the waist adjusting device is in actual use, the waist of a patient can be pressed through the adjusting air bag, and fatigue is relieved.

2. The medical bed is provided with the supporting mechanism, so that the height of the first bed board can be adjusted, and the medical bed is convenient for medical staff to operate.

3. The invention can adjust the distance between the two leg supports by arranging the third adjusting plate, can adjust the rotating angle of a single leg support by arranging the adjusting frame, is simple and convenient to adjust, and is suitable for patients with different body types.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a portion of the present invention;

FIG. 3 is an exploded view of a portion of the structure of the present invention;

FIG. 4 is a schematic view of a partial structure of the present invention;

FIG. 5 is an exploded view of a portion of the structure of the present invention;

FIG. 6 is a schematic view of a partial structure of the present invention;

FIG. 7 is an exploded view of a portion of the structure of the present invention;

FIG. 8 is an exploded view of a portion of the structure of the present invention;

FIG. 9 is an exploded view of a portion of the structure of the present invention;

FIG. 10 is an exploded view of a portion of the structure of the present invention;

FIG. 11 is an exploded view of a portion of the structure of the present invention;

FIG. 12 is an exploded view of a portion of the structure of the present invention;

FIG. 13 is a partial schematic structural view of the present invention;

fig. 14 is an exploded view of a portion of the structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

Fig. 1 shows an orthopedic traction rehabilitation nursing support, which comprises a rehabilitation nursing bed 1 and a traction frame 2 installed at the right end of the rehabilitation nursing bed 1 in a matching manner.

As shown in fig. 2 to 5, the rehabilitation and nursing bed 1 comprises a first bed board 11 and a second bed board 12 which are connected in sequence from bottom to top, wherein supporting mechanisms 13 are fixedly arranged at the left end and the right end of the lower bottom surface of the first bed board 11;

the supporting mechanism 13 includes a U-shaped supporting frame 131 and a moving frame 132 installed at the lower end of the U-shaped supporting frame 131 in a matching manner;

the U-shaped supporting frame 131 comprises a first supporting plate 1311 and second supporting plates 1312 vertically installed at two ends of the first supporting plate 1311, and the top surfaces of the second supporting plates 1312 are fixedly connected with the lower bottom surface of the first bed plate 11;

the moving frame 132 comprises a third supporting plate 1321, first mounting holes 1322 are formed in both ends of the third supporting plate 1321, first connecting columns 1323 are fixedly mounted in the first mounting holes 1322, second connecting columns 1324 are fixedly mounted on the top surfaces of the first connecting columns 1323, and moving wheels 1325 are mounted on the lower bottom surfaces of the first connecting columns 1323 in a matched mode;

the center of the top surface of the third supporting plate 1321 is provided with two symmetrically-arranged second mounting holes 1326, a third connecting column 1327 is fixedly arranged in the second mounting holes 1326, and the top surface of the first supporting plate 1311 is provided with two third mounting holes 1313 matched with the third connecting column 1327;

a fourth mounting hole 1314 matched with a second connecting column 1324 is formed in the center of the top surface of the second support plate 1312, two first threaded holes 1315 which are symmetrically formed are formed in the lower end of the front side surface of the second support plate 1312, a first bolt 1316 is connected to the first threaded holes 1315 in an internal thread mode, and a row of second threaded holes 1328 matched with the first bolt 1316 are uniformly distributed in the side surface of the second connecting column 1324;

with this arrangement, the movable wheel 1325 can be detached from the bottom of the U-shaped support frame 131, and the U-shaped support frame 131 can be adjusted in height by providing the plurality of second threaded holes 1328, which is suitable for practical use.

As shown in fig. 6 to fig. 7, the centers of the front and rear side surfaces of the second bed board 12 are both provided with first installation grooves 121, the first installation grooves 121 are connected with two first sliding boards 122 which are symmetrically arranged in a friction manner, the top surface of the first sliding board 122 is fixedly provided with a positioning column 1221, the front and rear ends of the top surface of the second bed board 12 are both provided with two second installation grooves 123 which are matched with the positioning column 1221, the top surface of the positioning column 1221 is fixedly provided with a second sliding board 124, and the top surface of the second sliding board 124 is fixedly provided with an adjusting air bag 125;

through the arrangement, when in actual use, the waist of a patient can be pressed by controlling and adjusting the contraction of the air bag 125, so that the discomfort caused by long-time lying is effectively relieved;

the connecting frame 111 is installed on the right side surface of the first bedplate 11 in a matching mode, and the connecting frame 111 is fixedly connected with the traction frame 2.

As shown in fig. 8, the connecting frame 111 includes a first fixing pillar 1111 and a cross pillar 1112 fixedly mounted at two ends of the first fixing pillar 1111, and a first connecting plate 1113 is fixedly mounted on an outer surface of the first fixing pillar 1111;

the outside slidable mounting of cross post 1112 has first regulating plate 1114, and the one end that first regulating plate 1114 kept away from cross post 1112 installs second regulating plate 1115 perpendicularly, and both ends all open third screw hole 1116 about the second regulating plate 1115 front side, and third screw hole 1116 female connection has second bolt 1117, and the right-hand member of first bed board 11 front and back both sides face all opens and has fourth screw hole 112 with second bolt 1117 matched with.

As shown in fig. 9 to 14, the traction frame 2 includes a second adjusting plate 21 and a third adjusting plate 22 fixedly mounted on the right side surface of the second adjusting plate 21, first through grooves 221 are respectively opened at the front and rear ends of the right side surface of the third adjusting plate 22, first sliders 222 are slidably mounted in the first through grooves 221, first sliding rods 223 and second sliding rods 224 are respectively mounted at the upper and lower ends of the first sliders 222, second through grooves 225 and third through grooves 226 communicated with the first through grooves 221 are respectively opened at the upper and lower ends of the top surface of the third adjusting plate 22, the first sliding rods 223 are slidably mounted in the second through grooves 225, the second sliding rods 224 are slidably mounted in the third through grooves 226, leg supports 23 are rotatably mounted at the upper ends of the outer surfaces of the first sliding rods 223, and adjusting frames 24 are fixedly mounted on the lower bottom surfaces of the second sliding rods 224;

a hydraulic push rod 227 is fixedly installed at the front end of the first through groove 221, and the output end of the hydraulic push rod 227 is fixedly connected with the first slider 222;

a third mounting groove 1118 matched with the second adjusting plate 21 is formed in the right side surface of the first connecting plate 1113, fifth threaded holes 211 are formed in the front end and the rear end of the top surface of the second adjusting plate 21, third bolts 212 are connected to the fifth threaded holes 211 in an internal thread mode, two sixth threaded holes 1119 matched with the third bolts 212 are formed in the top surface of the first connecting plate 1113, and the sixth threaded holes 1119 are communicated with the third mounting groove 1118;

the leg bracket 23 includes a leg placing plate 231, and a first placing hole 2311 matched with the first slide bar 223 is opened at the left end of the top surface of the leg placing plate 231;

a placing long groove 2312 is formed in the front side face of the leg placing plate 231, a hydraulic rod 2313 is fixedly mounted at the left end of the placing long groove 2312, a second slider 2314 is fixedly mounted at the output end of the hydraulic rod 2313, a third slider 232 is fixedly mounted on the front side face of the second slider 2314, a seventh threaded hole 2321 is formed in the center of the top face of the third slider 232, a rotating threaded rod 2322 is connected to the seventh threaded hole 2321 in an internal thread mode, a first pedal 2323 is fixedly mounted at the top of the rotating threaded rod 2322, a second pedal 2324 is vertically mounted at the right end of the top face of the first pedal 2323, and connecting straps 233 are fixedly mounted at the upper end and the lower end of the rear side face of the second pedal 2324;

a hydraulic rod 2313 is arranged, so that the position of the first pedal 2323 can be adjusted, and the feet of patients with different body types can be conveniently placed and fixed;

the center of the lower bottom surface of the leg placing plate 231 is fixedly provided with a telescopic rod 234;

the adjusting bracket 24 includes an arc-shaped disc 241, the lower bottom surface of the second sliding rod 224 is fixedly connected to the arc-shaped disc 241, and second placing holes 242 matched with the telescopic rods 234 are uniformly distributed along the circumference direction on the edge of the top surface of the arc-shaped disc 241.

Here, the hydraulic push rod 227 and the hydraulic rod 2313 are known as conventional electric hydraulic push rods.

In the actual use process, the adjusting air bag 125 is arranged, so that the waist of a patient can be pressed by the adjusting air bag 125 to relieve fatigue in the actual use process; the supporting mechanism 13 is arranged, so that the height of the first bed board 11 can be adjusted, and the medical staff can operate conveniently; the distance between the two leg supports 23 can be adjusted by arranging the third adjusting plate 22, the rotating angle of the single leg support 23 can be adjusted by arranging the adjusting frame 24, the adjustment is simple and convenient, and the leg support is suitable for patients with different body types.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims

1. The utility model provides an orthopedics pulls rehabilitation and nursing support which characterized in that: comprises a rehabilitation nursing bed (1) and a traction frame (2) which is arranged at the right end of the rehabilitation nursing bed (1) in a matching way;

the rehabilitation nursing bed (1) comprises a first bed board (11) and a second bed board (12) which are sequentially connected from bottom to top, wherein supporting mechanisms (13) are fixedly arranged at the left end and the right end of the lower bottom surface of the first bed board (11);

the center of the front side surface and the rear side surface of the second bed board (12) is provided with a first mounting groove (121), the first mounting groove (121) is internally connected with two first sliding plates (122) which are symmetrically arranged in a friction mode, the top surface of each first sliding plate (122) is fixedly provided with a positioning column (1221), the front end and the rear end of the top surface of the second bed board (12) are provided with two second mounting grooves (123) which are matched with the positioning columns (1221), the top surface of each positioning column (1221) is fixedly provided with a second sliding plate (124), and the top surface of each second sliding plate (124) is fixedly provided with an adjusting air bag (125);

the right side surface of the first bed board (11) is provided with a connecting frame (111) in a matching way, and the connecting frame (111) is fixedly connected with the traction frame (2);

the connecting frame (111) comprises a first fixing column (1111) and cross-shaped columns (1112) fixedly mounted at two ends of the first fixing column (1111), and a first connecting plate (1113) is fixedly mounted on the outer surface of the first fixing column (1111);

a first adjusting plate (1114) is slidably mounted outside the cross-shaped column (1112), a second adjusting plate (1115) is vertically mounted at one end, far away from the cross-shaped column (1112), of the first adjusting plate (1114), third threaded holes (1116) are formed in the left end and the right end of the front side face of the second adjusting plate (1115), second bolts (1117) are in threaded connection with the third threaded holes (1116), and fourth threaded holes (112) matched with the second bolts (1117) are formed in the right ends of the front side face and the rear side face of the first bed plate (11);

the traction frame (2) comprises a second adjusting plate (21) and a third adjusting plate (22) fixedly arranged on the right side surface of the second adjusting plate (21), the front end and the rear end of the right side surface of the third adjusting plate (22) are both provided with a first through groove (221), a first sliding block (222) is arranged in the first through groove (221) in a sliding manner, a first sliding rod (223) and a second sliding rod (224) are respectively arranged at the upper end and the lower end of the first sliding block (222), the upper end and the lower end of the top surface of the third adjusting plate (22) are respectively provided with a second through groove (225) and a third through groove (226) which are communicated with the first through groove (221), the first slide bar (223) is slidably mounted within a second through slot (225), the second slide bar (224) is slidably mounted within a third through slot (226), the upper end of the outer surface of the first slide bar (223) is rotatably provided with a leg bracket (23), an adjusting frame (24) is fixedly arranged on the lower bottom surface of the second sliding rod (224);

first connecting plate (1113) right flank is opened there is third mounting groove (1118) with second regulating plate (21) matched with, fifth screw hole (211) have all been opened at both ends around second regulating plate (21) top surface, fifth screw hole (211) female connection has third bolt (212), first connecting plate (1113) top surface is opened there are two and third bolt (212) matched with sixth screw hole (1119), sixth screw hole (1119) are linked together with third mounting groove (1118).

2. The orthopedic traction rehabilitation nursing support according to claim 1, wherein: the supporting mechanism (13) comprises a U-shaped supporting frame (131) and a moving frame (132) which is installed at the lower end of the U-shaped supporting frame (131) in a matching mode;

the U-shaped support frame (131) comprises a first support plate (1311) and second support plates (1312) vertically mounted at two ends of the first support plate (1311), and the top surface of each second support plate (1312) is fixedly connected with the lower bottom surface of the first bed plate (11);

the movable frame (132) comprises a third supporting plate (1321), first mounting holes (1322) are formed in two ends of the third supporting plate (1321), first connecting columns (1323) are fixedly mounted in the first mounting holes (1322), second connecting columns (1324) are fixedly mounted on the top surfaces of the first connecting columns (1323), and movable wheels (1325) are mounted on the lower bottom surfaces of the first connecting columns (1323) in a matched mode;

two symmetrically-arranged second mounting holes (1326) are formed in the center of the top surface of the third support plate (1321), a third connecting column (1327) is fixedly mounted in each second mounting hole (1326), and two third mounting holes (1313) matched with the third connecting columns (1327) are formed in the top surface of the first support plate (1311);

a fourth mounting hole (1314) matched with the second connecting column (1324) is formed in the center of the top surface of the second supporting plate (1312), two first threaded holes (1315) which are symmetrically formed are formed in the lower end of the front side surface of the second supporting plate (1312), first bolts (1316) are connected to the first threaded holes (1315) in an internal thread mode, and a row of second threaded holes (1328) matched with the first bolts (1316) are uniformly distributed in the side surface of the second connecting column (1324).

3. The orthopedic traction rehabilitation nursing support according to claim 1, wherein: the front end of the first through groove (221) is fixedly provided with a hydraulic push rod (227), and the output end of the hydraulic push rod (227) is fixedly connected with the first sliding block (222).

4. The orthopedic traction rehabilitation nursing support according to claim 1, wherein: the leg support (23) comprises a leg placing plate (231), and a first placing hole (2311) matched with the first sliding rod (223) is formed in the left end of the top surface of the leg placing plate (231);

a placing long groove (2312) is formed in the front side face of the leg placing plate (231), a hydraulic rod (2313) is fixedly mounted at the left end of the placing long groove (2312), a second slider (2314) is fixedly mounted at the output end of the hydraulic rod (2313), a third slider (232) is fixedly mounted on the front side face of the second slider (2314), a seventh threaded hole (2321) is formed in the center of the top face of the third slider (232), a rotating threaded rod (2322) is connected to the seventh threaded hole (2321) in an internal thread manner, a first pedal (2323) is fixedly mounted at the top of the rotating threaded rod (2322), a second pedal (2324) is vertically mounted at the right end of the top face of the first pedal (2323), and connecting straps (233) are fixedly mounted at the upper end and the lower end of the rear side face of the second pedal (2324);

the center of the lower bottom surface of the leg placing plate (231) is fixedly provided with a telescopic rod (234);

the adjusting frame (24) comprises an arc-shaped disc (241), the lower bottom surface of the second sliding rod (224) is fixedly connected with the arc-shaped disc (241), and second placing holes (242) matched with the telescopic rods (234) are uniformly distributed in the edge of the top surface of the arc-shaped disc (241) along the circumferential direction.