阅读说明：本技术 一种带弹性转动约束与竖向弹性支承的梁结构 (Beam structure with elastic rotation restraint and vertical elastic support ) 是由 周宇 唐礼平 石贤增 许成超 王雪忠 于 2020-05-01 设计创作，主要内容包括：本发明公开了一种带弹性转动约束与竖向弹性支承的梁结构,包括左右对称分布的两个弹性支撑机构,其中一个弹性支撑机构顶部安装有第一加载支撑机构,另一个弹性支撑机构顶部安装有第二加载支撑机构,第一加载支撑机构和第二加载支撑机构顶部之间水平安装有连接梁板。本发明适用于模拟真实桥梁中支座处的弹性约束支承边界条件,在梁悬臂外端进行等效配重,实现与多跨连续梁任意跨变形等效状态。在简支支座下安装弹簧支承系统,用于模拟真实桥梁桥墩与制作存在的竖向挠性变形,通过科学合理的结构设计,考虑了弹性力学边界影响,提高了桥梁结构的静、动力试验的准确性,且试验模型适配性更强,具有良好的实用与推广价值。(The invention discloses a beam structure with elastic rotation restraint and vertical elastic support, which comprises two elastic supporting mechanisms which are symmetrically distributed left and right, wherein a first loading supporting mechanism is arranged at the top of one elastic supporting mechanism, a second loading supporting mechanism is arranged at the top of the other elastic supporting mechanism, and a connecting beam plate is horizontally arranged between the tops of the first loading supporting mechanism and the second loading supporting mechanism. The invention is suitable for simulating the elastic constraint bearing boundary condition at the support in a real bridge, and equivalent weight balancing is carried out at the outer end of the beam cantilever, so that the equivalent state of the multi-span continuous beam with any span deformation is realized. The spring support system is arranged under the simply-supported support for simulating vertical flexible deformation of a real bridge pier and the manufacturing, the elastic mechanical boundary influence is considered through the scientific and reasonable structural design, the static and dynamic test accuracy of the bridge structure is improved, the test model has stronger adaptability, and the simple-supported bridge pier has good practical and popularization values.)

1. The utility model provides a take elasticity to rotate restraint and vertical elastic support's beam structure which characterized in that: the device comprises two elastic supporting mechanisms (1) which are symmetrically distributed in the left-right direction, wherein a first loading supporting mechanism (2) is arranged at the top of one elastic supporting mechanism (1), a second loading supporting mechanism (3) is arranged at the top of the other elastic supporting mechanism (1), and a connecting beam plate (4) is horizontally arranged between the tops of the first loading supporting mechanism (2) and the second loading supporting mechanism (3);

the elastic supporting mechanism (1) comprises an elastic supporting bottom plate (11) and an elastic supporting top plate (12) which is horizontally distributed above the elastic supporting bottom plate (11), the supporting bottom plate (11) and the elastic supporting top plate (12) are connected through four supporting connecting pieces (14), and a supporting spring (13) is arranged in the middle of each supporting connecting piece (14); bottom plate connecting screw holes (111) are uniformly distributed on the periphery of the elastic supporting bottom plate (11), mounting grooves (121) are uniformly distributed on the periphery of the top of the elastic supporting top plate (12), guide connecting holes (122) are formed in the bottoms of the mounting grooves (121), the supporting connecting piece (14) comprises a sliding connecting column (141) matched with the guide connecting holes (122), mounting lugs (142) matched with the mounting grooves (121) are arranged on the top of the sliding connecting column (141), positioning connecting studs (143) matched with the bottom plate connecting screw holes (111) are arranged on the bottom of the sliding connecting column (141), and supporting springs (13) are mounted on the outer side of the sliding connecting column (141);

the first loading supporting mechanism (2) comprises a first lower supporting plate (21) and a first upper supporting plate (23) distributed above the first lower supporting plate (21), first lower hinged blocks (22) are symmetrically installed on the left side and the right side of the first lower supporting plate (21), first upper hinged blocks (24) are symmetrically installed on the left side and the right side of the first upper supporting plate (23), a supporting roller (25) is horizontally installed in the middle of the first lower supporting plate (21), the first lower hinged blocks (22) are connected with the first upper hinged blocks (24) through first hinged strips (26), first lower connecting bolts (220) are symmetrically installed at the two ends of the first lower hinged blocks (22), first upper connecting bolts (240) are symmetrically installed at the two ends of the first upper hinged blocks (24), four first lower positioning bolts (210) fixedly connected with the elastic supporting top plate (12) are uniformly distributed on the periphery of the first lower supporting plate (21), four first upper positioning bolts (29) fixedly connected with the connecting beam plate (4) are uniformly distributed on the periphery of the first upper supporting plate (23), and first fastening nuts (290) are mounted at the tops of the first upper positioning bolts (29); first side clamping plates (27) are symmetrically arranged on the front side and the rear side of the first lower supporting plate (21), limiting connecting strips (28) are distributed on the outer sides of the first side clamping plates (27), first limiting bolts (281) are arranged at the tops of the limiting connecting strips (28), and second limiting bolts (282) are arranged at the bottoms of the limiting connecting strips (28);

first lower hinged block clamping grooves (211) matched with the first lower hinged blocks (22) are symmetrically formed in the left side and the right side of the first lower supporting plate (21), first lower hinged block connecting holes (212) are symmetrically formed in the two ends of the first lower hinged block clamping grooves (211), first lower hinged block countersunk holes (221) are symmetrically formed in the two ends of the first lower hinged blocks (22), first lower supporting plate countersunk holes (213) used for mounting first lower positioning bolts (210) are uniformly distributed in the periphery of the first lower supporting plate (21), the first lower connecting bolts (220) penetrate through the first lower hinged block countersunk holes (221) to be connected with the first lower hinged block connecting holes (212), and supporting roller connecting holes (251) are symmetrically formed in the two ends of the supporting roller (25);

first upper hinge block clamping grooves (231) matched with the first upper hinge blocks (24) are symmetrically formed in the left side and the right side of the first upper support plate (23), first upper hinge block connecting holes (232) are symmetrically formed in the two ends of the first upper hinge block clamping grooves (231), first upper hinge block counter bores (241) are symmetrically formed in the two ends of the first upper hinge blocks (24), first upper support plate counter bores (233) used for mounting first upper positioning bolts (29) are uniformly distributed in the periphery of the first upper support plate (21), and the first upper connecting bolts (240) penetrate through the first upper hinge block counter bores (241) to be connected with the first upper hinge block connecting holes (232); the top end of the first hinge strip (26) is hinged with the first upper hinge block (24), and the bottom end of the first hinge strip (26) is hinged with the first lower hinge block (22); the front side and the rear side of the first upper supporting plate (23) are symmetrically provided with upper supporting plate connecting holes (234);

the top of the first side clamping plate (27) is horizontally provided with a limiting transverse groove (271), a waist-shaped groove (280) is vertically arranged in the middle of the limiting connecting strip (28), a first limiting bolt (281) penetrates through the waist-shaped groove (280) to be fixedly connected with an upper supporting plate connecting hole (234), and a second limiting bolt (282) sequentially penetrates through the waist-shaped groove (280) and the limiting transverse groove (271) to be fixedly connected with a supporting roller connecting hole (251);

the connecting beam plate (4) comprises a connecting beam (41) and positioning connecting plates (42) symmetrically arranged at two ends of the connecting beam (41), and four positioning connecting through holes (43) are uniformly distributed on the periphery of each positioning connecting plate (42).

2. A beam structure with elastic rotation restriction and vertical elastic support according to claim 1, characterized in that: the second loading supporting mechanism (3) comprises a second lower supporting plate (31) and a second upper supporting plate (33) distributed above the second lower supporting plate (31), second lower hinged blocks (32) are symmetrically installed on the left side and the right side of the second lower supporting plate (31), second upper hinged blocks (34) are symmetrically installed on the left side and the right side of the second upper supporting plate (33), a supporting seat (35) is horizontally installed in the middle of the second lower supporting plate (31), the second lower hinged blocks (32) are connected with the second upper hinged blocks (34) through second hinged strips (36), second lower connecting bolts (320) are symmetrically installed at two ends of the second lower hinged blocks (32), second upper connecting bolts (340) are symmetrically installed at two ends of the second upper hinged blocks (34), four second lower positioning bolts (310) fixedly connected with the elastic supporting top plate (13) are uniformly distributed around the second lower supporting plate (31), four second upper positioning bolts (39) fixedly connected with the connecting beam plate (4) are uniformly distributed on the periphery of the second upper supporting plate (33), and second fastening nuts (390) are mounted at the tops of the second upper positioning bolts (39); second side clamping plates (37) are symmetrically arranged on the front side and the rear side of the second upper supporting plate (33), and third limiting bolts (38) are arranged at the bottoms of the second side clamping plates (37);

second lower hinged block clamping grooves (311) matched with the second lower hinged blocks (33) are symmetrically formed in the left side and the right side of the second lower supporting plate (31), second lower hinged block connecting holes (312) are symmetrically formed in two ends of each second lower hinged block clamping groove (311), second lower hinged block countersunk holes (321) are symmetrically formed in two ends of each second lower hinged block (32), second lower supporting plate countersunk holes (313) used for mounting second lower positioning bolts (310) are uniformly formed in the periphery of the second lower supporting plate (31), the second lower connecting bolts (320) penetrate through the second lower hinged block countersunk holes (321) to be connected with the second lower hinged block connecting holes (312), and a supporting seat clamping groove (314) is formed in the center of the surface of the second lower supporting plate (31); the supporting seat (35) comprises a supporting base platform (351) matched with the supporting seat clamping groove (314), a supporting top platform (352) with a regular triangle-shaped section is arranged at the top of the supporting base platform (351), and supporting seat connecting holes (353) are symmetrically formed in the front end and the rear end of the supporting seat (35);

the left side and the right side of the second upper supporting plate (33) are symmetrically provided with second upper hinge block clamping grooves (331) matched with the second upper hinge blocks (34), two ends of each second upper hinge block clamping groove (331) are symmetrically provided with second upper hinge block connecting holes (332), two ends of each second upper hinge block (34) are symmetrically provided with second upper hinge block counter bores (341), the periphery of the second upper supporting plate (31) is uniformly provided with second upper supporting plate counter bores (333) used for installing second upper positioning bolts (39), and the second upper connecting bolts (340) penetrate through the second upper hinge block counter bores (341) to be connected with the second upper hinge block connecting holes (332); the top end of the second hinge strip (36) is hinged with the second upper hinge block (34), and the bottom end of the second hinge strip (36) is hinged with the second lower hinge block (32);

an arc-shaped limiting groove (371) is formed in the bottom of the second side clamping plate (37), and a third limiting bolt (38) penetrates through the arc-shaped limiting groove (371) to be fixedly connected with the supporting seat connecting hole (353).

Technical Field

The invention belongs to the field of bridges, and particularly relates to a beam structure with elastic rotation restraint and vertical elastic support.

Background

The existing bridge structure system generally comprises bent frame piers erected on the ground, cover beams fixed above the bent frame piers and main beams arranged at the upper ends of the cover beams, and the structure is generally realized by improving material performance or increasing the size of a corresponding structure in the aspect of improving the seismic resistance without improving the structure system so as to improve the seismic resistance of a bridge.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a beam structure with elastic rotation restriction and vertical elastic support.

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

a beam structure with elastic rotation restraint and vertical elastic support comprises two elastic supporting mechanisms which are symmetrically distributed left and right, wherein a first loading supporting mechanism is installed at the top of one elastic supporting mechanism, a second loading supporting mechanism is installed at the top of the other elastic supporting mechanism, and a connecting beam plate is horizontally installed between the tops of the first loading supporting mechanism and the second loading supporting mechanism;

the elastic supporting mechanism comprises an elastic supporting bottom plate and an elastic supporting top plate which is horizontally distributed above the elastic supporting bottom plate, the supporting bottom plate is connected with the elastic supporting top plate through four supporting connecting pieces, and a supporting spring is arranged in the middle of each supporting connecting piece; the periphery of the elastic support bottom plate is uniformly provided with bottom plate connecting screw holes, the periphery of the top of the elastic support top plate is uniformly provided with mounting grooves, the bottom of each mounting groove is provided with a guide connecting hole, each support connecting piece comprises a sliding connecting column matched with the guide connecting hole, the top of each sliding connecting column is provided with a mounting lug matched with the mounting groove, the bottom of each sliding connecting column is provided with a positioning connecting stud matched with the bottom plate connecting screw hole, and the outer side of each sliding connecting column is provided with a support spring;

the first loading support mechanism comprises a first lower support plate and a first upper support plate distributed above the first lower support plate, first lower hinge blocks are symmetrically arranged on the left side and the right side of the first lower support plate, first upper hinge blocks are symmetrically arranged on the left side and the right side of the first upper support plate, a support roller is horizontally arranged in the middle of the first lower support plate, the first lower hinge blocks are connected with the first upper hinge blocks through first hinge strips, first lower connecting bolts are symmetrically arranged at the two ends of the first lower hinge blocks, first upper connecting bolts are symmetrically arranged at the two ends of the first upper hinge blocks, four first lower positioning bolts fixedly connected with the elastic support top plate are uniformly distributed around the first lower support plate, four first upper positioning bolts fixedly connected with the connecting beam plate are uniformly distributed around the first upper support plate, and a first fastening nut is mounted at the top of the first upper positioning bolts; first side clamping plates are symmetrically arranged on the front side and the rear side of the first lower supporting plate, limiting connecting strips are distributed on the outer sides of the first side clamping plates, first limiting bolts are arranged at the tops of the limiting connecting strips, and second limiting bolts are arranged at the bottoms of the limiting connecting strips;

first lower hinge block clamping grooves matched with the first lower hinge blocks are symmetrically formed in the left side and the right side of the first lower support plate, first lower hinge block connecting holes are symmetrically formed in two ends of each first lower hinge block clamping groove, first lower hinge block countersunk holes are symmetrically formed in two ends of each first lower hinge block, first lower support plate countersunk holes used for mounting first lower positioning bolts are evenly distributed in the periphery of the first lower support plate, the first lower connecting bolts penetrate through the first lower hinge block countersunk holes to be connected with the first lower hinge block connecting holes, and support roller connecting holes are symmetrically formed in two ends of the support roller;

first upper hinge block clamping grooves matched with the first upper hinge blocks are symmetrically formed in the left side and the right side of each first upper support plate, first upper hinge block connecting holes are symmetrically formed in two ends of each first upper hinge block clamping groove, first upper hinge block counter bores are symmetrically formed in two ends of each first upper hinge block, first upper support plate counter bores used for mounting first upper positioning bolts are evenly distributed in the periphery of each first upper support plate, and the first upper connecting bolts penetrate through the first upper hinge block counter bores to be connected with the first upper hinge block connecting holes; the top end of the first hinge strip is hinged with the first upper hinge block, and the bottom end of the first hinge strip is hinged with the first lower hinge block; the front side and the rear side of the first upper supporting plate are symmetrically provided with upper supporting plate connecting holes;

the top of the first side clamping plate is horizontally provided with a limiting transverse groove, a waist-shaped groove is vertically arranged in the middle of the limiting connecting strip, a first limiting bolt penetrates through the waist-shaped groove to be fixedly connected with an upper supporting plate connecting hole, and a second limiting bolt sequentially penetrates through the waist-shaped groove and the limiting transverse groove to be fixedly connected with a supporting roller connecting hole;

the connecting beam plate comprises a connecting beam and positioning connecting plates symmetrically arranged at two ends of the connecting beam, and four positioning connecting through holes are uniformly distributed on the periphery of each positioning connecting plate.

Furthermore, the second loading support mechanism comprises a second lower support plate and a second upper support plate distributed above the second lower support plate, second lower hinged blocks are symmetrically installed on the left side and the right side of the second lower support plate, second upper hinged blocks are symmetrically installed on the left side and the right side of the second upper support plate, a support seat is horizontally installed in the middle of the second lower support plate, the second lower hinged blocks are connected with the second upper hinged blocks through second hinged strips, second lower connecting bolts are symmetrically installed at two ends of each second lower hinged block, second upper connecting bolts are symmetrically installed at two ends of each second upper hinged block, four second lower positioning bolts fixedly connected with the elastic support top plate are uniformly distributed on the periphery of the second lower support plate, four second upper positioning bolts fixedly connected with the connecting beam plate are uniformly distributed on the periphery of each second upper support plate, and second fastening nuts are installed at the tops of the second upper positioning bolts; second side clamping plates are symmetrically arranged on the front side and the rear side of the second upper supporting plate, and third limiting bolts are arranged at the bottoms of the second side clamping plates;

second lower hinged block clamping grooves matched with the second lower hinged blocks are symmetrically formed in the left side and the right side of the second lower supporting plate, second lower hinged block connecting holes are symmetrically formed in two ends of each second lower hinged block clamping groove, second lower hinged block countersunk holes are symmetrically formed in two ends of each second lower hinged block, second lower supporting plate countersunk holes used for mounting second lower positioning bolts are uniformly distributed in the periphery of the second lower supporting plate, the second lower connecting bolts penetrate through the second lower hinged block countersunk holes to be connected with the second lower hinged block connecting holes, and supporting seat clamping grooves are formed in the center of the surface of the second lower supporting plate; the supporting seat comprises a supporting base station matched with the supporting seat clamping groove, a supporting top table with a regular triangle-shaped section is arranged at the top of the supporting base station, and supporting seat connecting holes are symmetrically formed in the front end and the rear end of the supporting seat;

second upper hinge block clamping grooves matched with the second upper hinge blocks are symmetrically formed in the left side and the right side of each second upper support plate, second upper hinge block connecting holes are symmetrically formed in two ends of each second upper hinge block clamping groove, second upper hinge block counter bores are symmetrically formed in two ends of each second upper hinge block, second upper support plate counter bores used for mounting second upper positioning bolts are evenly distributed in the periphery of each second upper support plate, and the second upper connecting bolts penetrate through the second upper hinge block counter bores to be connected with the second upper hinge block connecting holes; the top end of the second hinge strip is hinged with the second upper hinge block, and the bottom end of the second hinge strip is hinged with the second lower hinge block;

and an arc-shaped limiting groove is formed in the bottom of the second side clamping plate, and a third limiting bolt penetrates through the arc-shaped limiting groove and is fixedly connected with the supporting seat connecting hole.

The invention has the beneficial effects that:

the invention is suitable for simulating the elastic constraint bearing boundary condition at the support in a real bridge, and equivalent weight balancing is carried out at the outer end of the beam cantilever, so that the equivalent state of the multi-span continuous beam with any span deformation is realized. The spring support system is installed under the simply-supported support for simulating vertical flexible deformation of a real bridge pier and the manufacturing, elastic mechanical boundary influence is considered through scientific and reasonable structural design, the static and dynamic test accuracy of the bridge structure is improved, the test model is high in adaptability, the shock resistance of the bridge is effectively improved, and the spring support system has good practical and popularization values.

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 an exploded view of a portion of the structure of the present invention;

FIG. 3 is a schematic view of a partial structure of the present invention;

FIG. 4 is an exploded view of a portion of the structure of the present invention;

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

FIG. 6 is an exploded view of a portion of the structure of the present invention;

FIG. 7 is a partial schematic view 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 a partial structural schematic 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.

As shown in fig. 1, the beam structure with elastic rotation restriction and vertical elastic support comprises two elastic support mechanisms 1 which are bilaterally symmetrically distributed, wherein a first loading support mechanism 2 is installed at the top of one elastic support mechanism 1, a second loading support mechanism 3 is installed at the top of the other elastic support mechanism 1, and a connecting beam plate 4 is horizontally installed between the tops of the first loading support mechanism 2 and the second loading support mechanism 3;

as shown in fig. 2, the elastic support mechanism 1 includes an elastic support bottom plate 11 and an elastic support top plate 12 horizontally distributed above the elastic support bottom plate 11, the support bottom plate 11 and the elastic support top plate 12 are connected by four support connectors 14, and a support spring 13 is installed in the middle of each support connector 14; the periphery of the elastic support bottom plate 11 is uniformly provided with bottom plate connecting screw holes 111, the periphery of the top of the elastic support top plate 12 is uniformly provided with mounting grooves 121, the bottoms of the mounting grooves 121 are provided with guide connecting holes 122, the support connecting piece 14 comprises a sliding connecting column 141 matched with the guide connecting holes 122, the top of the sliding connecting column 141 is provided with a mounting lug 142 matched with the mounting groove 121, the bottom of the sliding connecting column 141 is provided with a positioning connecting stud 143 matched with the bottom plate connecting screw holes 111, and the outer side of the sliding connecting column 141 is provided with a support spring 13;

as shown in fig. 3, the first loading supporting mechanism 2 includes a first lower supporting plate 21 and a first upper supporting plate 23 distributed above the first lower supporting plate 21, first lower hinge blocks 22 are symmetrically installed on the left and right sides of the first lower supporting plate 21, first upper hinge blocks 24 are symmetrically installed on the left and right sides of the first upper supporting plate 23, a supporting roller 25 is horizontally installed in the middle of the first lower supporting plate 21, the first lower hinge blocks 22 and the first upper hinge blocks 24 are connected through first hinge strips 26, first lower connecting bolts 220 are symmetrically installed on both ends of the first lower hinge blocks 22, first upper connecting bolts 240 are symmetrically installed on both ends of the first upper hinge blocks 24, four first lower positioning bolts 210 fixedly connected with the elastic supporting top plate 12 are uniformly distributed around the first lower supporting plate 21, four first upper positioning bolts 29 fixedly connected with the connecting beam plate 4 are uniformly distributed around the first upper supporting plate 23, the top of the first upper positioning bolt 29 is provided with a first fastening nut 290; first side clamping plates 27 are symmetrically arranged on the front side and the rear side of the first lower supporting plate 21, limiting connecting strips 28 are distributed on the outer sides of the first side clamping plates 27, first limiting bolts 281 are arranged at the tops of the limiting connecting strips 28, and second limiting bolts 282 are arranged at the bottoms of the limiting connecting strips 28;

as shown in fig. 4, first lower hinge block slots 211 matched with the first lower hinge blocks 22 are symmetrically arranged on the left and right sides of the first lower support plate 21, first lower hinge block connection holes 212 are symmetrically arranged at two ends of the first lower hinge block slots 211, first lower hinge block countersunk holes 221 are symmetrically arranged at two ends of the first lower hinge blocks 22, first lower support plate countersunk holes 213 for mounting first lower positioning bolts 210 are uniformly distributed around the first lower support plate 21, the first lower connection bolts 220 pass through the first lower hinge block countersunk holes 221 to be connected with the first lower hinge block connection holes 212, and support roller connection holes 251 are symmetrically arranged at two ends of the support roller 25;

as shown in fig. 5, first upper hinge block slots 231 matched with the first upper hinge blocks 24 are symmetrically arranged on the left and right sides of the first upper support plate 23, first upper hinge block connecting holes 232 are symmetrically arranged at two ends of the first upper hinge block slots 231, first upper hinge block counter bores 241 are symmetrically arranged at two ends of the first upper hinge blocks 24, first upper support plate counter bores 233 for mounting the first upper positioning bolts 29 are uniformly distributed around the first upper support plate 21, and the first upper connecting bolts 240 pass through the first upper hinge block counter bores 241 to be connected with the first upper hinge block connecting holes 232; the top end of the first hinge strip 26 is hinged with the first upper hinge block 24, and the bottom end of the first hinge strip 26 is hinged with the first lower hinge block 22; the front side and the rear side of the first upper supporting plate 23 are symmetrically provided with upper supporting plate connecting holes 234;

as shown in fig. 6, a limiting transverse groove 271 is horizontally arranged at the top of the first side clamping plate 27, a waist-shaped groove 280 is vertically arranged in the middle of the limiting connecting strip 28, a first limiting bolt 281 passes through the waist-shaped groove 280 to be fixedly connected with the upper supporting plate connecting hole 234, and a second limiting bolt 282 sequentially passes through the waist-shaped groove 280, the limiting transverse groove 271 and the supporting roller connecting hole 251 to be fixedly connected;

as shown in fig. 7, the second loading supporting mechanism 3 includes a second lower supporting plate 31 and a second upper supporting plate 33 disposed above the second lower supporting plate 31, second lower hinge blocks 32 are symmetrically disposed on the left and right sides of the second lower supporting plate 31, second upper hinge blocks 34 are symmetrically disposed on the left and right sides of the second upper supporting plate 33, a supporting seat 35 is horizontally disposed in the middle of the second lower supporting plate 31, the second lower hinge blocks 32 and the second upper hinge blocks 34 are connected by second hinge strips 36, second lower connecting bolts 320 are symmetrically disposed at the two ends of the second lower hinge blocks 32, second upper connecting bolts 340 are symmetrically disposed at the two ends of the second upper hinge blocks 34, four second lower positioning bolts 310 fixedly connected to the elastic supporting top plate 13 are uniformly disposed around the second lower supporting plate 31, four second upper positioning bolts 39 fixedly connected to the connecting beam plate 4 are uniformly disposed around the second upper supporting plate 33, a second fastening nut 390 is mounted on the top of the second upper positioning bolt 39; second side clamping plates 37 are symmetrically arranged on the front side and the rear side of the second upper supporting plate 33, and third limiting bolts 38 are arranged at the bottoms of the second side clamping plates 37;

as shown in fig. 8, second lower hinge block slots 311 matched with the second lower hinge blocks 33 are symmetrically formed in the left and right sides of the second lower support plate 31, second lower hinge block connecting holes 312 are symmetrically formed in two ends of the second lower hinge block slots 311, second lower hinge block countersunk holes 321 are symmetrically formed in two ends of the second lower hinge block 32, second lower support plate countersunk holes 313 used for mounting second lower positioning bolts 310 are uniformly distributed around the second lower support plate 31, the second lower connecting bolts 320 penetrate through the second lower hinge block countersunk holes 321 to be connected with the second lower hinge block connecting holes 312, and a support seat slot 314 is formed in the center of the surface of the second lower support plate 31; the supporting seat 35 comprises a supporting base 351 matched with the supporting seat clamping groove 314, a supporting top platform 352 with a regular triangle-shaped section is arranged at the top of the supporting base 351, and supporting seat connecting holes 353 are symmetrically arranged at the front end and the rear end of the supporting seat 35;

as shown in fig. 9, second upper hinge block slots 331 matched with the second upper hinge blocks 34 are symmetrically arranged on the left and right sides of the second upper support plate 33, second upper hinge block connection holes 332 are symmetrically arranged at two ends of the second upper hinge block slots 331, second upper hinge block counter bores 341 are symmetrically arranged at two ends of the second upper hinge blocks 34, second upper support plate counter bores 333 for installing second upper positioning bolts 39 are uniformly distributed around the second upper support plate 31, and the second upper connecting bolts 340 pass through the second upper hinge block counter bores 341 to be connected with the second upper hinge block connection holes 332; the top end of the second hinge strip 36 is hinged with the second upper hinge block 34, and the bottom end of the second hinge strip 36 is hinged with the second lower hinge block 32;

as shown in fig. 10, an arc-shaped limiting groove 371 is formed at the bottom of the second side plate 37, and the third limiting bolt 38 passes through the arc-shaped limiting groove 371 and is fixedly connected with the support seat connecting hole 353.

As shown in fig. 11, the connecting beam plate 4 includes a connecting beam 41 and positioning connecting plates 42 symmetrically disposed at two ends of the connecting beam 41, and four positioning connecting through holes 43 are uniformly distributed around the positioning connecting plates 42.

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.