CN111829763B - Electric spring fatigue testing device of containing type node - Google Patents
Electric spring fatigue testing device of containing type node Download PDFInfo
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- CN111829763B CN111829763B CN202010348925.0A CN202010348925A CN111829763B CN 111829763 B CN111829763 B CN 111829763B CN 202010348925 A CN202010348925 A CN 202010348925A CN 111829763 B CN111829763 B CN 111829763B
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- node
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- pressing plate
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- cross beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
The invention relates to an electric spring fatigue loading test device of a containing type node, which comprises a counterforce frame, a cross beam, an electric loading device, a spring combination and the like, wherein an electric push rod loads an upper tested piece welded on the cross beam, namely a novel containing type node through the spring combination; the spring combination can conveniently provide dynamic load and simulate fatigue load, so that a fatigue loading test is carried out on the node. The invention can well simulate the fatigue stress characteristics similar to the containing type node, and has the advantages of compact structure, convenient installation, low cost and light weight.
Description
Technical Field
The invention belongs to the field of hoisting machinery, port machinery, maritime work equipment and engineering machinery, and particularly relates to a fatigue testing device for a contained node.
Background
The truss structure has the characteristics of simple structure, strong bearing capacity, convenient processing, light dead weight and the like, and is widely applied to engineering, particularly the fields of hoisting machinery and engineering machinery. From the current engineering practice, the damage or failure of the truss structure is mainly caused by the occurrence of problems at the truss nodes, so that the nodes of the truss structure play a crucial role in the bearing capacity and the service life of the whole truss structure. The traditional truss joint generally adopts a round tube intersecting joint, a gusset plate joint and the like, and the joints are simple in form and easy to process, but often have the following main problems:
(1) the number of the web members which can be connected on the same node is limited due to the volume of the node, and the conventional node cannot meet the requirements for some truss structure forms which need a plurality of intersecting web members;
(2) in the traditional intersecting welding joint, the length of an intersecting line mainly depends on the section size of a web member, and the length of the welding line of the intersecting line cannot be increased, so that the bearing capacity of the joint is greatly restricted, and the working capacity of the whole machine is limited finally;
(3) the Z-direction stress at the node is serious, and a Z-direction plate is often adopted, so that the cost is increased.
In view of the not enough of truss node now, the design has developed a novel contained formula node, and this node appearance is the swell form, and structural style is novel, and contained formula node has following advantage:
(1) the node is in a bulge shape, so that the area for welding the web members is greatly increased, and when the web members with the same section size are used, the length of the intersecting line is longer, so that the bearing capacity of the node is increased, and the safety of a truss structure is improved;
(2) the node is in a bulge shape, so that the node is provided with an inner cavity, the web member can be inserted into the cavity and then welded with the node in a penetrating way, and the Z-direction stress of the node is eliminated;
(3) the node is welded to the chord member after being independently processed, on one hand, the processing quality of the node can be independently guaranteed, and on the other hand, the chord member is not required to be damaged.
Before the practical engineering application of the contained node is popularized, fatigue stress related tests need to be carried out on the newly designed contained node, so that an experimental test bench needs to be developed for carrying out dynamic-load fatigue experiments on the novel contained node.
Disclosure of Invention
The invention aims to design a containment type node fatigue test experiment table which is simple in structure, convenient to process, low in cost and convenient to control. The test bed can meet the requirement of a containing type node fatigue stress loading test, and is light in weight, convenient to install and convenient to debug.
In order to solve the problems in the prior art, the invention is realized by the following technical scheme.
An electric spring fatigue testing device of a containing node comprises:
reaction frame, contained node, spring unit and electric putter, the reaction frame top is provided with oblique corbel, electric putter pass through bolted connection in oblique corbel, the both ends of contained node are fixed in on the reaction frame, electric putter passes through spring unit with contained nodal connection is in order to provide dynamic load.
In one embodiment, the contained node comprises a cross beam, a bulge-shaped curved plate and web members, the web members are welded to the curved plate, the curved plate is welded to the cross beam, and two ends of the cross beam are connected to two sides of the reaction frame through bolts.
In one embodiment, the reaction frame is a single truss structure.
In one embodiment, the counterforce frame comprises two opposite vertical columns and a cover plate, the two opposite vertical columns are connected through the cover plate, one end of the oblique supporting beam is connected with the vertical columns, and the other end of the oblique supporting beam is connected with the cover plate.
In one embodiment, the spring assembly comprises a first pressing plate, a second pressing plate, a spring and a guide rod, one end of the guide rod is fixedly connected with the first pressing plate, the other end of the guide rod penetrates through the second pressing plate and is locked through a nut, the spring is sleeved on the guide rod between the first pressing plate and the second pressing plate, and the electric push rod is connected with the second pressing plate.
Compared with the prior art, the invention has the following advantages:
(1) the invention has simple structure, light weight, convenient processing and low cost, and adopts lightweight materials.
(2) The power source of the invention is the electric push rod, which is convenient to control and debug and maintain.
(3) According to the invention, the loading source and the containing node are connected by adopting the spring assembly, and the load borne by the containing node is related to the deformation of the spring, so that dynamic load can be provided, and the fatigue load can be conveniently simulated.
Drawings
FIG. 1 is a general structural diagram of an electric spring fatigue testing device of a contained node according to the present invention;
FIG. 2 is a schematic diagram of the spring assembly of the present invention;
FIG. 3 is a schematic diagram of a structure of a contained node according to the present invention.
The reference numbers illustrate:
the node-1 of the containing type is provided with a plurality of nodes,
the reaction force frame-2 is provided with a reaction force frame,
the spring component-3 is provided with a spring component,
an electric push rod-4 is arranged on the upper part of the frame,
a first pressing plate-5 is arranged on the upper portion of the frame,
a second pressure plate-6 is arranged on the upper surface of the frame,
the spring-7 is arranged on the upper portion of the shell,
a guide rod-8 is arranged on the upper part of the frame,
the cross beam-9 is provided with a beam,
a bulge-shaped bent plate-10,
a web member-11.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Referring to fig. 1, a fatigue testing device for an electric spring 7 with a contained node comprises: reaction frame 2, contained node 1, spring unit 3 and electric putter 4, reaction frame 2 top is provided with oblique corbel, electric putter 4 through bolted connection in oblique corbel, the both ends of contained node 1 are fixed in on the reaction frame 2, electric putter 4 passes through spring unit 3 with contained node 1 is connected in order to provide dynamic load. The reaction frame 2 is designed to be a single truss structure, the structure is an internal force structure, force flow circulates in the frame, the whole experiment table is guaranteed to have no external acting force, the experiment table can be installed and placed more conveniently, and the experiment environment requirement is low.
Referring to fig. 3, in one embodiment, the contained node 1 includes a cross beam 9, a bulge-shaped curved plate 10 and a web member 11, the web member 11 is welded to the bulge-shaped curved plate 10, the bulge-shaped curved plate 10 is welded to the cross beam 9, and two ends of the cross beam 9 are connected to two sides of the reaction frame 2 through bolts.
In one embodiment, the counterforce frame 2 comprises two opposite uprights and a cover plate, the two opposite uprights are connected by the cover plate, one end of the oblique supporting beam is connected with the uprights, and the other end of the oblique supporting beam is connected with the cover plate.
Referring to fig. 2, in one embodiment, the spring assembly 3 includes a first pressing plate 5, a second pressing plate 6, a spring 7 and a guide rod 8, one end of the guide rod 8 is fixedly connected to the first pressing plate 5, the other end of the guide rod 8 penetrates through the second pressing plate 6 and is locked by a nut, the spring 7 is sleeved on the guide rod 8 located between the first pressing plate 5 and the second pressing plate 6, the electric push rod 4 is connected to the second pressing plate 6, the second pressing plate 6 can gradually move toward or away from the first pressing plate 5 along the direction of the guide rod 8, and the first pressing plate 5 is connected to the web member 11. For example, the guide rod 8 is a bolt, the guide rod 8 sequentially penetrates through the first pressing plate 5 and the second pressing plate 6 and is locked by a nut, and a spring 7 is sleeved on the bolt between the first pressing plate 5 and the second pressing plate 6. Through set up guide bar 8 in the spring unit 3 for spring 7 can not drop when spring 7 combination is reciprocating motion, guarantees experiment stability. While allowing the spring 7 reaction force to be in the direction of the web 11. The springs 7 in the spring assemblies 3 obey Hooke's law, and the reaction force of the spring assemblies 3 on the cross beam 9 is related to the deformation amount of the springs 7, so that dynamic load can be provided in a transient state, and the load condition of the containing node 1 in fatigue can be well simulated.
Electric putter 44 passes through the bolt and links to each other with spring unit 3 one end, for example, spring unit 3 other end passes through bolt fixed connection with web member 11, and electric putter 4 and spring unit 3 are used for providing dynamic load to crossbeam 9 on the formula node 1 of holding, the tired atress condition of the formula node of simulation that can be fine.
The invention adopts the electric push rod 4 as a power source to load the containing node.
Example 1:
as shown in figures 1-3, the invention is composed of a counterforce frame 2, a cross beam 9, a spring assembly 3 and an electric push rod 4. Welding a circular tube to the punched bulge-shaped bent plate 10, and then welding a welded product to a cross beam 9, wherein the cross beam 9 is connected with a counterforce frame 21 through a bolt; the tail end of an electric push rod 4 is connected with a counter-force frame 2 through a bolt, the push rod end of the electric push rod 4 is connected with a spring assembly 3 through a bolt, and the other end of the spring assembly 3 is connected with a web member 11 welded on the containing type node 1 through a bolt. When the device is used, the embedded type controller is connected with the electric push rod 4, the electric push rod 4 is controlled to move according to the frequency required by an experiment, the spring 7 in the spring assembly 3 is driven to deform along the guide rod 8, the load required by the experiment is applied to the containing type node 1, and therefore the fatigue stress condition is simulated on the containing type node 1.
The embodiments described above are intended to facilitate the understanding and appreciation of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should understand that they can make improvements and modifications without departing from the scope of the present invention.
Claims (3)
1. An electric spring fatigue test device of contained node, characterized by comprising: the electric push rod is connected with the containment type node through the spring assembly to provide dynamic load;
the containing type node comprises a cross beam, a bulge-shaped curved plate and web members, the web members are welded on the curved plate, the curved plate is welded on the cross beam, and two ends of the cross beam are connected to two sides of the counter-force frame through bolts;
the spring assembly comprises a first pressing plate, a second pressing plate, a spring and a guide rod, one end of the guide rod is fixedly connected with the first pressing plate, the other end of the guide rod penetrates through the second pressing plate and is locked through a nut, the spring is sleeved on the guide rod between the first pressing plate and the second pressing plate, and the electric push rod is connected with the second pressing plate.
2. The apparatus for testing electric spring fatigue of a contained node as claimed in claim 1, wherein the reaction frame has a single truss structure.
3. The electric spring fatigue testing device of contained node as claimed in claim 2, wherein said reaction frame comprises two opposite uprights and a cover plate, said two opposite uprights are connected through said cover plate, one end of said oblique supporting beam is connected with said uprights, and the other end of said oblique supporting beam is connected with said cover plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010348925.0A CN111829763B (en) | 2020-04-28 | 2020-04-28 | Electric spring fatigue testing device of containing type node |
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| CN202010348925.0A CN111829763B (en) | 2020-04-28 | 2020-04-28 | Electric spring fatigue testing device of containing type node |
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| CN111829763B true CN111829763B (en) | 2022-05-06 |
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| CN111829763A (en) | 2020-10-27 |
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