阅读说明：本技术 带预应力铝合金组合构件的装配式节点 (Assembled node with prestressed aluminum alloy combined component ) 是由 郭小农 张超众 唐文豪 王丽 宗绍晗 于 2019-09-06 设计创作，主要内容包括：本申请涉及铝合金单层网壳结构技术领域,提供一种带预应力铝合金组合构件的装配式节点,该装配式节点包括预应力铝合金组合构件、节点圆筒、端板和节点盖板等部件,预应力铝合金组合构件由带V形槽口的H形截面杆件和预应力拉杆组成。现场施工时,只需将预应力拉杆穿过端板和节点圆筒,并通过螺栓在圆筒内壁连接预应力拉杆即可实现装配,最后将节点盖板通过预应力拉杆连接在圆筒两端。本申请不需要在节点盖板和杆件上开螺栓孔,避免了节点板和杆件截面削弱,减少了螺栓数量,便于施工,且施工质量容易保证；同时,由于预应力拉杆和H形截面构件的组合作用,使得构件在轴压及压弯荷载作用下的稳定承载力提高,并且可以减少H形截面型材的材料用量。(The utility model relates to an aluminum alloy individual layer latticed shell structure technical field provides an assembled node of taking prestressing force aluminum alloy composite member, and this assembled node includes parts such as prestressing force aluminum alloy composite member, node drum, end plate and node apron, and prestressing force aluminum alloy composite member comprises H shape cross-section member and the prestressing force pull rod of taking the V-arrangement notch. During site operation, the prestressed pull rod only needs to penetrate through the end plate and the node cylinder, the prestressed pull rod is connected to the inner wall of the cylinder through the bolt, assembly can be achieved, and finally the node cover plate is connected to the two ends of the cylinder through the prestressed pull rod. According to the method, bolt holes do not need to be formed in the node cover plate and the rod piece, the weakening of the cross sections of the node plate and the rod piece is avoided, the number of bolts is reduced, the construction is convenient, and the construction quality is easy to guarantee; meanwhile, due to the combined action of the prestressed pull rod and the H-shaped section member, the stable bearing capacity of the member under the action of axial compression and bending load is improved, and the material consumption of the H-shaped section can be reduced.)

1. The utility model provides a take assembled node of prestressing force aluminum alloy composite member which characterized in that: the joint comprises a prestress aluminum alloy combined component (1), a joint cylinder (2), an end plate (3) and a joint cover plate (4);

the prestressed aluminum alloy combined members (1) are respectively connected to the same node cylinder (2) through the front ends of the prestressed aluminum alloy combined members and are distributed along the radial circumference of the node cylinder (2) in a radial shape; meanwhile, the rear end of each prestressed aluminum alloy combined component (1) is also respectively connected with a node cylinder (2);

the prestressed aluminum alloy combined component (1) comprises an H-shaped section rod piece (1-1) and a prestressed pull rod (1-2); the H-shaped section rod piece (1-1) comprises an upper flange plate, a lower flange plate, a straight vertical plate, an inverted V-shaped vertical plate and a positive V-shaped vertical plate; the upper flange plate and the lower flange plate are arranged in parallel up and down, and the upper end and the lower end of the straight vertical plate are respectively and vertically connected between the upper flange plate and the lower flange plate through the inverted V-shaped vertical plate and the positive V-shaped vertical plate; a pull rod channel which is communicated from front to back is respectively formed between the upper flange plate and the inverted V-shaped vertical plate and between the lower flange plate and the regular V-shaped vertical plate, a prestressed pull rod (1-2) is respectively penetrated in the pull rod channel, and the front end and the rear end of the prestressed pull rod (1-2) respectively penetrate through a node cylinder (2) and are connected with the node cylinder;

the front end and the rear end of the prestressed pull rod (1-2) are respectively provided with an end plate (3) in a penetrating way; the end plate (3) is positioned between the node cylinder (2) and the H-shaped section rod piece (1-1), and the shapes of the two sides of the end plate are matched and adapted with the outer side wall of the node cylinder (2) and the end surface of the H-shaped section rod piece (1-1) respectively;

meanwhile, the upper end face and the lower end face of each node cylinder (2) are respectively provided with a node cover plate (4) which are connected through a central bolt (7).

2. The fabricated node of a prestressed aluminum alloy composite structure as recited in claim 1, wherein: one side of the end plate (3) is a plane, and is provided with a special-shaped notch matched with the upper part or the lower part of the section of the H-shaped section rod piece (1-1), and the special-shaped notch is clamped with the upper part or the lower part of the section of the H-shaped section rod piece (1-1);

the other side of the end plate (3) is an arc surface which is adaptive to the outer side wall of the node cylinder (2), and the curvature of the arc surface is the same as that of the outer wall of the node cylinder (2).

3. The fabricated node of a prestressed aluminum alloy composite structure as recited in claim 2, wherein: the special-shaped notch formed in one side of the end plate (3) comprises a linear notch, an inverted triangular notch and a Y-shaped notch which are sequentially communicated;

the linear notch is matched and adapted with the section of the upper flange plate or the lower flange plate, transversely penetrates through one side of the end plate (3), and is clamped with the section of the upper flange plate or the lower flange plate;

the inverted triangular notch is matched and adapted with the section of the inverted V-shaped vertical plate or the section of the regular V-shaped vertical plate and is clamped with the section of the inverted V-shaped vertical plate or the section of the regular V-shaped vertical plate;

the lower end of the Y-shaped notch is open and is matched and adapted with the cross section of the straight-line-shaped vertical plate, and the Y-shaped notch is clamped with the cross section of the straight-line-shaped vertical plate.

4. The fabricated node of a prestressed aluminum alloy composite structure as recited in claim 1, wherein: the node cylinder (2) comprises a cylinder body and a plurality of vertical stiffening plate pieces;

a plurality of vertical stiffening plate pieces are installed on the inner wall of the cylinder body in a launching manner by taking the central shaft of the cylinder body as the center, and a vertical through hole is formed at the center intersection of the vertical stiffening plate pieces and is used for penetrating through a central bolt (7);

meanwhile, a node through hole is also formed in the wall of the barrel corresponding to the position connected with the prestressed pull rod (1-2) and used for penetrating through the prestressed pull rod (1-2).

5. The fabricated node of a prestressed aluminum alloy composite structure as recited in claim 4, wherein: a cover plate round hole is formed in the center of the node cover plate (4) and is used for penetrating through a central bolt (7);

a screw rod of the central bolt (7) sequentially penetrates through a cover plate round hole of the node cover plate (4) above the node cylinder (2), a vertical through hole of the node cylinder (2) and a cover plate round hole of the node cover plate (4) below the node cylinder (2) from top to bottom, and two ends of the screw rod are fixed through nuts respectively.

6. The fabricated node of a prestressed aluminum alloy composite structure as recited in claim 1, wherein: the inner side of the node cover plate (4) is provided with an annular notch, and the node cover plate (4) is clamped with the upper end and the lower end of the node cylinder (2) through the annular notch.

7. The fabricated node of a prestressed aluminum alloy composite structure as recited in claim 1, wherein: the front end and the rear end of the prestressed pull rod (1-2) are respectively provided with a thread, and the threads penetrate through the cylinder wall of the node cylinder (2) and are connected with the node cylinder (2) through nuts (5).

8. The fabricated node of a prestressed aluminum alloy composite structure as recited in claim 7, wherein: the nut (5) is provided with an arc washer (6);

the arc washer (6) is positioned between the nut (5) and the inner side wall of the node cylinder (2), one side of the arc washer is a plane and is attached to the nut (5), the other side of the arc washer is an arc surface, and the curvature of the arc surface is the same as that of the inner wall of the node cylinder (2).

9. The fabricated node of a prestressed aluminum alloy composite structure as recited in claim 1, wherein: the front ends of the upper flange plate and the lower flange plate are provided with chamfers.

10. The fabricated node of a prestressed aluminum alloy composite structure as recited in claim 9, wherein: the chamfers at the front ends of the upper flange plate and the lower flange plate are the same in size and are all 30 degrees.

Technical Field

The application relates to an aluminum alloy single-layer latticed shell structure, in particular to an assembled node with a prestressed aluminum alloy combined component.

Background

The aluminum alloy material has the advantages of light weight, high strength, good corrosion resistance, convenient processing, capability of being integrally formed and the like, and is widely applied to the field of large-span space structures, such as garden greenhouses, large-scale dry coal bunker top covers, oil storage tank arch items, sewage treatment plant ceilings and the like.

At present, the most widely applied node form in the aluminum alloy single-layer latticed shell is a plate-type node developed by the American Temcor company, a rod flange is connected with an upper cover plate and a lower cover plate through a plurality of bolts, the node is convenient to construct, but the requirement on the machining precision is high due to the requirement that a plurality of bolt holes are required to be formed and the node plate is arched, and the stability problem of an aluminum alloy member is more prominent under the action of axial compression and bending load because the elastic modulus of the aluminum alloy is only 1/3 of steel. The above problems limit further application of the aluminum alloy plate type node reticulated shell, and therefore, a novel single-layer reticulated shell node form which is suitable for aluminum alloy material characteristics and is convenient to construct needs to be researched and developed urgently.

Disclosure of Invention

The utility model aims at overcoming prior art's not enough, providing a take assembled node of prestressing force aluminum alloy composite member for the stable bearing capacity of component under the effect of axle load and the load of buckling improves.

In order to achieve the above object, the present application provides the following technical solutions:

an assembled node with a prestressed aluminum alloy combined member comprises the prestressed aluminum alloy combined member, a node cylinder, an end plate and a node cover plate;

the prestressed aluminum alloy combined components are respectively connected to the same node cylinder through the front ends of the prestressed aluminum alloy combined components and are distributed along the radial circumference of the node cylinder in an emission shape; simultaneously, the rear end of each prestressed aluminum alloy combined component is also respectively connected with a node cylinder;

the prestressed aluminum alloy combined component comprises an H-shaped section rod piece and a prestressed pull rod; the H-shaped section rod piece comprises an upper flange plate, a lower flange plate, a straight-line-shaped vertical plate, an inverted V-shaped vertical plate and a positive V-shaped vertical plate; the upper flange plate and the lower flange plate are arranged in parallel up and down, and the upper end and the lower end of the straight vertical plate are respectively and vertically connected between the upper flange plate and the lower flange plate through the inverted V-shaped vertical plate and the positive V-shaped vertical plate; a pull rod channel which is communicated from front to back is respectively formed between the upper flange plate and the inverted V-shaped vertical plate and between the lower flange plate and the regular V-shaped vertical plate, a prestressed pull rod is respectively penetrated in the pull rod channel, and the front end and the rear end of the prestressed pull rod respectively penetrate through a node cylinder and are connected with the node cylinder;

the front end and the rear end of the prestressed pull rod are respectively provided with an end plate in a penetrating way; the end plates are positioned between the node cylinder and the H-shaped section rod piece, and the shapes of the two sides of the end plates are matched and adapted with the outer side wall of the node cylinder and the end surface of the H-shaped section rod piece respectively;

and the upper end surface and the lower end surface of each node cylinder are respectively provided with a node cover plate and are connected through a central bolt.

Furthermore, one side of the end plate is a plane and is provided with a special-shaped notch matched with the upper part or the lower part of the section of the rod piece with the H-shaped section, and the special-shaped notch is clamped with the upper part or the lower part of the section of the rod piece with the H-shaped section;

the other side of the end plate is an arc surface matched with the outer side wall of the node cylinder, and the curvature of the arc surface is the same as that of the outer wall of the node cylinder.

Further, the special-shaped notch formed in one side of the end plate comprises a linear notch, an inverted triangular notch and a Y-shaped notch which are sequentially communicated;

the linear notch is matched and adapted with the section of the upper flange plate or the lower flange plate, transversely penetrates through one side of the end plate and is clamped with the section of the upper flange plate or the lower flange plate;

the inverted triangular notch is matched and adapted with the section of the inverted V-shaped vertical plate or the section of the regular V-shaped vertical plate and is clamped with the section of the inverted V-shaped vertical plate or the section of the regular V-shaped vertical plate;

the lower end of the Y-shaped notch is open and is matched and adapted with the cross section of the straight-line-shaped vertical plate, and the Y-shaped notch is clamped with the cross section of the straight-line-shaped vertical plate.

Further, the node cylinder comprises a cylinder body and a plurality of vertical stiffening plate pieces; the vertical stiffening plates are installed on the inner wall of the barrel in a launching manner by taking the central shaft of the barrel as the center, and a vertical through hole is formed at the center intersection of the vertical stiffening plates and is used for penetrating through a central bolt.

Furthermore, a cover plate round hole is formed in the center of the node cover plate and used for penetrating through the center bolt; a screw rod of the central bolt sequentially penetrates through a cover plate round hole of a node cover plate above the node cylinder, a vertical through hole of the node cylinder and a cover plate round hole of the node cover plate below the node cylinder from top to bottom, and two ends of the screw rod are fixed through nuts respectively.

Furthermore, the inner side of the node cover plate is provided with an annular notch, and the node cover plate is clamped with the upper end and the lower end of the node cylinder through the annular notch.

Furthermore, the front end and the rear end of the prestressed pull rod are provided with threads, and the threads penetrate through the cylinder wall of the node cylinder and are connected with the node cylinder through nuts.

Further, the nut is provided with an arc washer;

the arc washer is located between nut and node drum inside wall, and its one side is the plane, with the nut laminating, and its opposite side is the arc surface, and the camber of this arc surface is the same with the camber of node drum inner wall.

Furthermore, chamfers are machined at the front ends of the upper flange plate and the lower flange plate.

Further, the chamfers at the front ends of the upper flange plate and the lower flange plate are the same in size, in a preferred embodiment, the chamfers can be set to be 30 degrees, so that the front ends of the upper flange plate and the lower flange plate after the chamfers are machined are in an isosceles trapezoid shape, the cross-sectional size of the end part of the rod piece with the H-shaped cross section is reduced, and the connecting node is not too large.

In the application, except the nut and the central bolt are made of stainless steel materials, the other parts are made of aluminum alloy materials, and the prestressed pull rod is made of high-strength aluminum alloy materials.

Compared with the prior art, the beneficial effects of this application are:

the construction method has the advantages of definite force transfer, simple structure, convenience in construction, high assembly degree and the like, bolt holes do not need to be formed in the node cover plate and the rod piece, the weakening of the cross sections of the node plate and the rod piece is avoided, the number of bolts is reduced, the construction is convenient, and the construction quality is easy to guarantee; meanwhile, due to the combined action of the prestressed pull rod and the H-shaped section member, the stable bearing capacity of the member under the action of axial compression and bending load is improved, and the material consumption of the H-shaped section can be reduced.

Drawings

FIG. 1 is a general schematic view of an assembled node with a prestressed aluminum alloy composite member according to an embodiment of the present disclosure;

FIG. 2 is a schematic plan view of an assembled node with a prestressed aluminum alloy composite member according to an embodiment of the present disclosure;

FIG. 3 is a schematic view illustrating an assembling method of an assembled node with a prestressed aluminum alloy composite member according to an embodiment of the present disclosure;

FIG. 4 is a partial sectional view of an assembled node with a prestressed aluminum alloy composite member according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a prestressed aluminum alloy composite member according to an embodiment of the present disclosure;

FIG. 6a is a schematic view of one side of an end plate according to an embodiment of the present application;

FIG. 6b is a schematic view of the other side of the end plate provided by an embodiment of the present application;

FIG. 7 is a schematic view of a node cylinder provided in an embodiment of the present application;

FIG. 8a is a schematic view of an outer side of a node cover plate according to an embodiment of the present disclosure;

FIG. 8b is a schematic view of the inner side of a gusset plate according to an embodiment of the present application;

FIG. 9 is a schematic view of a nut with an arcuate washer provided in accordance with an embodiment of the present application;

fig. 10 is a schematic view of a center bolt provided in an embodiment of the present application.

Description of the reference numerals

The steel plate comprises a 1 prestressed aluminum alloy combined component, a 1-1H-shaped section rod piece, a 1-2 prestressed pull rod, a 2-node cylinder, a 3-end plate, a 4-node cover plate, 5 nuts, 6 arc-shaped gaskets and 7 center bolts.

Detailed Description

The technical solutions provided in the present application will be further described with reference to the following specific embodiments and accompanying drawings. The advantages and features of the present application will become more apparent in conjunction with the following description.

As shown in fig. 1 to 10, an assembled node with a prestressed aluminum alloy composite member includes a prestressed aluminum alloy composite member 1, a node cylinder 2, an end plate 3 and a node cover plate 4.

The prestressed aluminum alloy combined members 1 are respectively connected to the same node cylinder 2 through the front ends thereof and are distributed along the radial circumference of the node cylinder 2 in a radial shape; meanwhile, the rear end of each prestressed aluminum alloy combined component 1 is also respectively connected with a node cylinder 2;

an end plate 3 is arranged between each prestressed aluminum alloy combined component 1 and each node cylinder 2; meanwhile, the upper end surface and the lower end surface of the node cylinder 2 are respectively provided with a node cover plate 4 which are connected through a central bolt 7.

The prestressed aluminum alloy combined component 1 comprises an H-shaped section bar 1-1 with a notch and a prestressed pull rod 1-2; the H-shaped section rod piece 1-1 is formed by extrusion and comprises an upper flange plate, a lower flange plate, a straight-line-shaped vertical plate, an inverted V-shaped vertical plate and a positive V-shaped vertical plate, wherein the inverted V-shaped vertical plate and the positive V-shaped vertical plate are in isosceles triangle shapes; the upper flange plate and the lower flange plate are arranged in parallel up and down, the upper end and the lower end of the straight vertical plate are respectively and vertically connected between the upper flange plate and the lower flange plate through the inverted V-shaped vertical plate and the positive V-shaped vertical plate, namely, the upper flange plate is connected to the upper end of the straight vertical plate through the inverted V-shaped vertical plate, and the lower flange plate is connected to the lower end of the straight vertical plate through the positive V-shaped vertical plate; a pull rod channel which is communicated from front to back is respectively formed between the upper flange plate and the inverted V-shaped vertical plate and between the lower flange plate and the regular V-shaped vertical plate, a pre-stress pull rod 1-2 is respectively arranged in the pull rod channel in a penetrating mode, threads are arranged at the front end and the rear end of the pre-stress pull rod 1-2 and extend out of the pull rod channel, and the pre-stress pull rod 1-2 is connected with the node cylinder 2 through the threads at the front end and the rear end of the pre-stress pull rod by nuts 5.

In order to facilitate the connection of the rod piece 1-1 with the H-shaped section and the node cylinder 2, chamfers are processed at the front ends of the upper flange plate and the lower flange plate; in a preferred embodiment, the chamfers at the front ends of the upper flange plate and the lower flange plate are the same in size and are both 30 degrees, and the front ends of the chamfered upper flange plate and the chamfered lower flange plate are in an isosceles trapezoid shape so as to reduce the section size of the end part of the rod member 1-1 with the H-shaped section and prevent the connecting node from being too large.

The front ends of the prestressed pull rods 1-2 are respectively provided with an end plate 3 in a penetrating way; the end plate 3 is positioned between the node cylinder 2 and the H-shaped section rod member 1-1, one side of the end plate is connected with the H-shaped section rod member 1-1, and the other side of the end plate is connected with the node cylinder 2.

Furthermore, one side of the end plate 3 is a plane and is provided with a special-shaped notch matched with the upper part or the lower part of the section of the H-shaped section rod piece 1-1, and the special-shaped notch is clamped with the upper part or the lower part of the section of the H-shaped section rod piece 1-1; the other side of the end plate 3 is an arc surface adapted to the outer side wall of the node cylinder 2, and the curvature of the arc surface is the same as that of the outer wall of the node cylinder 2 so as to be attached to the node cylinder 2.

The special-shaped notch formed in one side of the end plate 3 comprises a linear notch, an inverted triangular notch and a Y-shaped notch which are sequentially communicated; the linear notch is matched and adapted with the section of the upper flange plate or the lower flange plate, transversely penetrates through one side of the end plate 3, and is clamped with the section of the upper flange plate or the lower flange plate; the inverted triangular notch is matched and adapted with the section of the inverted V-shaped vertical plate or the section of the regular V-shaped vertical plate and is clamped with the section of the inverted V-shaped vertical plate or the section of the regular V-shaped vertical plate; the lower end of the Y-shaped notch is open and is matched and adapted with the cross section of the straight-line-shaped vertical plate, and the Y-shaped notch is clamped with the cross section of the straight-line-shaped vertical plate.

In order to enable the rod piece 1-1 with the H-shaped section to be conveniently clamped in the end plate 3, the sizes of the lower ends of the linear notch and the Y-shaped notch are 4-6 mm larger than the size of the corresponding section of the end part of the rod piece 1-1 with the H-shaped section, and the size of the triangular notch is the same as that of the inverted V-shaped vertical plate or the positive V-shaped vertical plate.

In order to facilitate the prestressed pull rod 1-2 to pass through, end plate through holes are further formed in the inverted triangular notch of the end plate 3, the end plate through holes penetrate through the front side and the rear side of the end plate 3, and the inner diameter of the end plate through holes is preferably 2-4 mm larger than the diameter of the prestressed pull rod 1-2.

The node cylinder 2 can be formed by die casting and comprises a cylinder body and a plurality of vertical stiffening plate pieces, wherein the vertical stiffening plate pieces are installed on the inner wall of the cylinder body in a launching manner by taking a central shaft of the cylinder body as a center, and a vertical through hole is formed at the center intersection of the vertical stiffening plate pieces and is used for penetrating through a central bolt 7; meanwhile, a node through hole is also formed in the cylinder wall of the cylinder body corresponding to the position connected with the prestress pull rod 1-2 and used for penetrating through the prestress pull rod 1-2, and the inner diameter of the node through hole is 2mm larger than the diameter of the prestress pull rod 1-2.

The front end of the prestressed pull rod 1-2 sequentially passes through an end plate through hole on the end plate 3 and a node through hole on the node cylinder 2, and the inner side of the node cylinder 2 is connected with the front end of the prestressed pull rod 1-2 through a nut 5 in a threaded manner.

The nut 5 in threaded connection with the end part of the prestressed pull rod 1-2 is provided with an arc washer 6, and the arc washer 6 is positioned between the nut 5 and the inner side wall of the node cylinder 2; one side of the arc washer 6 is a plane and is jointed with the nut 5, and the other side of the arc washer is an arc surface, and the curvature of the arc surface is the same as that of the inner wall of the node cylinder 2 so as to be jointed with the inner wall of the node cylinder 2; meanwhile, a circular washer hole is formed in the middle of the arc-shaped washer 6 and used for penetrating through the prestressed pull rod 1-2, and the inner diameter of the circular washer hole is 2mm larger than the diameter of the prestressed pull rod 1-2.

The upper end face and the lower end face of the node cylinder 2 are respectively provided with a node cover plate 4, the inner side of each node cover plate 4 is provided with an annular notch, the width of each annular notch is 2-4 mm larger than the thickness of the cylinder wall of the cylinder body of the node cylinder 2, and the cylinder wall of the node cylinder 2 can be clamped through the annular notch; a cover plate round hole is formed in the center of the node cover plate 4 and is used for penetrating through a center bolt 7; a screw rod of the central bolt 7 sequentially penetrates through a cover plate round hole of the node cover plate 4 above the node cylinder 2, a vertical through hole of the node cylinder 2 and a cover plate round hole of the node cover plate 4 below the node cylinder 2 from top to bottom, and meanwhile, two ends of the screw rod are fixed through nuts.

In the present application, the components other than the nut and the center bolt 7 are made of stainless steel, and the prestressed tension rod 1-2 is made of high-strength aluminum alloy.

Required parts of this application all can be in mill's processing completion, transport the job site and can carry out the construction of full assembly, and the scene need not weld.

The specific assembling method of the assembled node with the prestressed aluminum alloy combined component provided by the application is as follows:

(1) the end part of the rod piece 1 with the H-shaped section is clamped with the end plate 3 through a special-shaped notch at the plane side of the end plate 3;

(2) the prestressed pull rod 1-2 penetrates through an end plate through hole on an end plate 3 and penetrates through a pull rod through hole on the rod piece 1-1 with the H-shaped section;

(3) the front end of the prestressed pull rod 1-2 extends into the cylinder body of the node cylinder 2 through a node through hole on the node cylinder 2, the front end of the prestressed pull rod 1-2 is pulled by a nut 5, the rear end of the prestressed pull rod 1-2 is pulled and fixed in the node cylinder 2 at the rear end of the prestressed pull rod 1-2 by a bolt 5; the back end of the prestressed tension rod 1-2 is a node in the same form as the front end.

(4) Connecting the residual prestressed aluminum alloy combined components 1 with the node cylinder 2 according to the method in the step (3);

(5) after the joint cylinder 2 is connected with all the prestressed aluminum alloy combined components 1, the upper end surface and the lower end surface of the joint cylinder are respectively covered with joint cover plates 4 and are fixed by adopting a central bolt 7 through nuts.

The above description is only illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the present application in any way. Any changes or modifications made by those skilled in the art based on the above disclosure should be considered as equivalent effective embodiments, and all the changes or modifications should fall within the protection scope of the technical solution of the present application.