CN104865120B - Sheet metal fatigue testing machine for L ED radiator - Google Patents

Abstract

The invention relates to a sheet metal fatigue testing machine for an L ED radiator, which comprises a driving mechanism, a supporting part, a guide disc, a rotary disc and a force application part, wherein the supporting part and the guide disc are fixedly connected, the rotary disc is of a circular structure and is in driving connection with the driving mechanism, an annular limiting part is arranged on the supporting part, the rotary disc is rotatably arranged in the limiting part and is accommodated between the supporting part and the guide disc, a plurality of guide holes which are arranged in a clockwise emission manner by using the axis of the rotary disc are formed in the rotary disc, a plurality of sliding grooves which are arranged in an emission manner by using the axis of the guide disc are formed in the guide disc, the force application part comprises a brace and a slide block which is rotatably connected with the brace, the slide block and the brace are respectively slidably arranged in the guide holes and the sliding grooves, the rotary disc is driven by the driving mechanism to stably rotate in the limiting part, the slide block is further driven to slide along the guide holes, so that the brace slides along the sliding grooves.

Description

Metal sheet fatigue testing machine for LED heat sink

technical field

The invention relates to the technical field of testing the fatigue performance of plates, in particular to a metal plate fatigue testing machine for LED heat sinks.

Background technique

Sheet metal exhibits fatigue phenomena under alternating loads such as axial loading, rotational bending loading, and torsional loading. By applying axial alternating loads to the metal sheet, important mechanical performance indicators such as fatigue characteristics, strength, ductility, strain hardening and toughness of the metal sheet can be analyzed. In engineering applications, fatigue performance is one of the main bases for the static strength design of sheet metal structures, which can reflect the fatigue resistance and fracture properties of sheet metal.

Traditionally, the device for applying axial load to the metal sheet cannot apply multi-directional loads to the metal sheet in a balanced manner. In addition, it is unstable in the process of applying axial alternating loads, resulting in unbalanced multi-directional loads on the metal sheet and unable to keep the same direction of force during the test process. The stability is not good, and the fatigue performance index of the metal sheet cannot be accurately reflected. .

Contents of the invention

Based on this, it is necessary to provide a metal sheet fatigue testing machine for LED heat sinks to solve the problems of unbalanced and poor stability of the axial alternating loads applied to the metal sheet in multiple directions in the prior art. question.

A metal plate fatigue testing machine for LED radiators, comprising: a driving mechanism, a support part, a circular turntable, a guide disk, and a force applying member;

The support part is provided with an annular limit part, the turntable is rotatably arranged in the limit part, and the guide plate is fixedly connected with the support part, so that the turntable is accommodated in the support part and the support part. between the guide discs;

The shaft centers of the support part, the turntable and the guide disk are respectively provided with through placement holes, through holes and accommodating holes;

A plurality of guide holes are provided on the turntable, and the plurality of guide holes are arranged radially in a clockwise direction with respect to the axis of the turntable;

The side of the guide plate facing the turntable is provided with a plurality of chute slots, and several of the chute slots are arranged radially with the axis of the guide disc;

The force application member includes a pull bar and a slider rotatably connected to the pull bar, the slide block is slidably arranged in the guide hole, and the tie bar is slidably arranged in the chute;

The driving mechanism is connected with the turntable, and is used to drive the slider to slide along the guide hole when the turntable is driven to rotate, so that the pull bar slides along the slide groove.

In one of the embodiments, an ear portion extends outward from the edge of the turntable.

In one embodiment, the driving mechanism includes a telescopic cylinder and a connecting piece, the telescopic cylinder is fixedly connected to the support part through the connecting piece, and the telescopic shaft of the telescopic cylinder is hinged to the ear.

In one of the embodiments, the driving structure further includes a mounting part and a proximity switch disposed on the mounting part, and the mounting part is fixedly connected to the connecting piece.

In one of the embodiments, the through hole is circular.

In one of the embodiments, the placement hole is circular.

The metal plate fatigue testing machine for LED radiators drives the circular structure of the turntable to rotate stably in the annular limit part through the driving mechanism, and then drives the slider to slide along the guide hole, so that the pull bar slides along the chute, so that Realize the application of axial variable loads in multiple directions to the metal plate connected with several braces, so that the force of the metal plate in multiple directions is balanced, and the accuracy of the fatigue performance test of the metal plate is improved.

Description of drawings

Fig. 1 is the schematic structural view of the sheet metal fatigue testing machine that is used for LED heat sink of a preferred embodiment of the present invention;

Fig. 2 is the explosion diagram of the metal plate fatigue testing machine for LED heat sink shown in Fig. 1;

Fig. 3 is a perspective view of the guide plate shown in Fig. 1;

Fig. 4 is a structural schematic diagram of the force applying member shown in Fig. 1;

FIG. 5 is a structural diagram of the turntable, the guide disk and the force application member shown in FIG. 2 .

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

As shown in Figures 1 and 2, wherein, Figure 1 is a schematic structural view of a metal plate fatigue testing machine 10 for LED heat sinks according to a preferred embodiment of the present invention, and Figure 2 is a schematic diagram of a metal plate fatigue tester 10 for LED heat sinks shown in Figure 1 . Exploded view of radiator sheet metal fatigue testing machine 10.

The sheet metal fatigue testing machine 10 for LED heat sinks includes: a driving mechanism 11 , a support portion 12 , a turntable 13 , a guide disk 14 and a force applying member 15 .

The guide plate 14 is fixedly connected with the supporting part 12 . The turntable 13 is rotatably accommodated between the support portion 12 and the guide plate 14 . It can be understood that the turntable 13 rotates with a fixed axis relative to the support portion 12 and the guide plate 14 . Since the guide plate 14 is fixedly connected with the support portion 12, the rotation of the guide plate 14 during the rotation of the turntable 13 is avoided, thus increasing the working stability of the sheet metal fatigue testing machine 10 for LED radiators.

A placement hole 121 , a through hole 131 , and an accommodating hole 141 are formed at the axes of the support portion 12 , the turntable 13 and the guide disk 14 respectively. A plurality of guide holes 132 are defined on the turntable 13 , and the plurality of guide holes 132 are radially arranged in a clockwise direction around the axis of the turntable 13 .

In this embodiment, an annular boss 122 is arranged on the supporting part 12 , and the boss 122 is arranged around the placement hole 121 . The through hole 131 is circular and fits on the outside of the boss 122 so that the turntable 13 rotates around the boss 122 . It is easy to understand that in order to ensure the stability of the turntable 13 rotating around the boss 122 , the diameter of the through hole 131 is equivalent to the diameter of the boss 122 to ensure the smooth rotation of the turntable 13 . In other embodiments, the bosses 122 can also be arranged intermittently.

Realizing that the turntable 13 rotates with a fixed axis relative to the support part 12 is not limited to the arrangement of an annular boss 122 on the support part 12. In other embodiments, for example, a circle is formed around the placement hole 121 on the support part 12 An annular groove, a plurality of sliding rods are correspondingly provided on the rotating disk 13 facing the annular groove, or an annular protrusion is correspondingly arranged on the rotating disk 13 facing the annular groove, and a plurality of the sliding bars Inserting the rod into the annular groove, or inserting the annular protrusion into the annular groove can also realize the rotation of the turntable 13 relative to the support part 12 with a fixed axis. As another example, an annular groove is provided on the turntable 13 around the through hole 131 and toward the side of the support portion 12, and a plurality of slide bars are correspondingly provided on the support portion 12 toward the annular groove, or the support portion 12 A circular protrusion is correspondingly arranged on the upper side facing the circular groove, and a plurality of the sliding rods are inserted into the circular groove, or a circular protrusion is inserted into the circular groove, It is also possible to realize that the turntable 13 rotates with a fixed axis relative to the support part 12 .

In this embodiment, the turntable 13 has a circular structure. In order to further realize the stability of the rotation of the turntable 13 on the support part 12, the support part 12 is provided with an annular stopper 123, and the stopper 123 is the same as the boss 122. The axis is set, so that the turntable 13 can rotate between the boss 122 and the limiting part 123 with its axis, which improves the stability of the turntable 13 when it rotates. In other embodiments, the turntable 13 with a circular structure can be rotated around its axis without setting the boss 122. For example, the support part 12 is provided with an annular stopper 123, and the turntable 13 is rotated at the stopper. 123 , the turntable 13 always slides against the inner wall of the limiting part 123 during the rotation process, so as to ensure the stability of the turntable 13 rotating on its axis.

In this embodiment, the supporting portion 12 is a circular structure, preferably, the placement hole 121 is circular. In other embodiments, the supporting part 12 may also be in a square structure, an oval structure, and the like. The guide disc 14 has a circular structure, and preferably, the accommodating hole 141 is circular, and may also be a regular polygon. In other embodiments, the guide plate 14 may also be in a square structure, an oval structure, and the like.

As shown in FIG. 3 , it is a perspective view of the guide plate 14 shown in FIG. 1 . A side of the guide plate 14 facing the turntable 13 is provided with a plurality of sliding grooves 142 , and the plurality of sliding grooves 142 are radially arranged around the axis of the guide plate 14 .

Referring to FIG. 4 and FIG. 5 together, FIG. 4 is a schematic structural diagram of the force application member 15 shown in FIG. 1 , and FIG. 5 is a structural diagram of the turntable 13 , the guide plate 14 and the force application member 15 shown in FIG. 2 . The force application member 15 includes a pull bar 151 and a slider 152 rotatably connected to the pull bar 151 , the slide block 152 is slidably disposed in the guide hole 132 , and the pull bar 151 is slidably disposed in the slide slot 142 . Specifically, the slider 152 is rotatably connected to one end of the tie bar 151 , and the other end of the tie bar 151 protrudes from the accommodating hole 141 in order to facilitate placing the metal plate in the accommodation hole 141 and further connecting with the tie bar 151 . In order to facilitate the connection of metal sheets, for example, the other end of the brace 151 is provided with a hook-shaped portion, and the hook-shaped portion is arranged towards the support portion 12. In practical applications, the metal sheets are pre-cut into a circle and balanced Several pull holes are provided, so that the detachable connection between the pull bar 151 and the metal plate is realized through the hook-shaped portion penetrating the pull holes. As another example, the other end of the tie bar 151 is provided with a clamping portion. In practical applications, the metal plate is pre-cut into a circular shape, and the detachable connection with the metal plate is realized through the clamping function of the clamping portion on the metal plate.

Referring to Fig. 1 and Fig. 2 again, the driving mechanism 11 is driven and connected with the turntable 13 to drive the slider 152 to slide along the guide hole 132 when the turntable 13 is driven to rotate, so that the pull bar 151 slides along the chute 142 to realize several pull bars 151 shrinks and expands, because several braces 151 are evenly arranged, after being connected with the metal sheet, the metal sheet can be stably stretched in multiple directions, so that the axial load of the metal sheet in multiple directions is balanced, Improve the accuracy of the metal plate fatigue performance test. In this embodiment, an ear portion 133 extends outwards from the edge of the turntable 13, and the driving mechanism 11 includes a telescopic cylinder 111 and a connector 112. The ears 133 are hinged. In order to cooperate with the ear portion 133 , a notch 1231 is provided in the annular stop portion 123 close to the telescopic shaft 1111 , so as to prevent the ear portion 133 from being blocked when the telescopic cylinder 111 drives the ear portion 133 to rotate.

In order to control the rotation range of the turntable 13 and prevent the telescopic cylinder 111 from running out of control when the turntable 13 is driven, causing the pull bar 151 to stretch the metal sheet too much and tearing the metal sheet, the driving structure 11 also includes a mounting part 113 and is arranged on the mounting The proximity switch 114 on the part 113 is fixedly connected with the connecting part 112 on the installation part 113 . The proximity switch 114 does not need to be in direct contact with the telescopic shaft 1111. When the connection position between the telescopic shaft 1111 and the ear portion 133 is close to the proximity switch 114 and is sensed, the proximity switch 114 can generate a trigger signal, and the external control unit can be activated according to the trigger signal. The signal controls the telescopic shaft 1111 of the telescopic cylinder 111 to effectively control the rotation of the turntable 13 and increase the reliability and stability of the work of the sheet metal fatigue testing machine 10 for LED radiators. Moreover, the proximity switch 114 has stable performance, fast frequency response, long service life, strong anti-interference ability, etc., and has the characteristics of waterproof, shockproof, and corrosion resistance. The range of application of radiator sheet metal fatigue testing machine 10. In order to control the rotation range of the turntable 13 within a required range, there are two proximity switches 114 and the waist-shaped holes. The two proximity switches 114 are arranged at intervals and inserted into the two waist-shaped holes correspondingly.

In order to adjust the position of the proximity switch 114 on the mounting portion 113 conveniently, the mounting portion 113 is provided with a waist-shaped hole (not shown in the figure), and the proximity switch 114 is inserted into the waist-shaped hole. In this way, when the rotation range of the turntable 13 needs to be adjusted, the proximity switch 114 is moved in the waist-shaped hole and fixed to a specific position.

Referring to Fig. 4 and Fig. 5 again, in order to facilitate the replacement of the pull bar 151, the pull bar 151 includes a pull bar 1511 and a slide bar 1512, the slide block 152 is rotationally connected with the slide bar 1512, and the pull bar 1511 is connected by bolts away from the slide block 152 The end of the sliding bar 1512, the bottom of the chute 142 on the guide plate 14 offers a bar-shaped hole 143, and the pulling bar 1511 is slidably arranged along the bar-shaped hole 143. In this way, the pulling bar 1511 and the sliding bar 1512 can be disassembled without dismantling the turntable 13 and the guide plate 14 , and taken out through the bar-shaped hole 143 , which facilitates the replacement of the pulling bar 1511 .

In practical applications, preferably, the turntable 13 and the support portion 12 are made of iron and steel. In order to reduce the wear of the turntable 13 and the support portion 12, it is necessary to reduce the friction factor between the turntable 13 and the support portion 12. In this embodiment, The contact surface between the supporting part 12 and the turntable 13 is coated with a solid lubricating film material, and the solid lubricating film material is composed of the following components: 19wt% to 32wt% cobalt with a diameter of 28um to 71um, 13wt% to 27wt% cobalt Fluorinated graphite with a diameter of 30nm-56nm, 8wt%-15wt% sodium fluoride, 25wt%-48wt% zirconium dioxide, and 10wt%-31wt% binder.

In the solid lubricating film material, cobalt with a diameter of 28um to 71um is a magnetic nanoparticle, which has high hardness, strength and wear resistance, and is easily adsorbed to the metal material during the relative friction between the turntable 13 and the support part 12 contact surface. In the present invention, the content of cobalt is 19wt%-32wt%, preferably 22wt%-28wt%. The diameter of cobalt is preferably 45um-65um.

Graphite fluoride is a carbon-graphite functional material produced by the reaction of carbon and fluorine at high temperature. Since graphite fluoride has a layered structure and the molecular force between layers is weak, the distance between layers It is twice that of graphite and has excellent lubricating properties, and graphite fluoride with a diameter of 30nm to 56nm is easy to deposit a thin film on the contact surface of the metal material during the friction process, and can firmly adhere to the surface of the metal material. Not easy to fall off. In the present invention, the content of graphite fluoride is 13wt%-27wt%, preferably 19wt%-22wt%. The diameter of graphite fluoride is preferably 41 nm to 52 nm.

In the repeated axial tensile test of the metal plate, the frequency of clockwise and counterclockwise rotation of the turntable 13 relative to the support part 12 is very high, forming a high temperature environment on the contact surface, the effect of sodium fluoride used as an additive Best, and better synergistic effect with other components in the solid lubricating film material, easy to form a transfer film on the contact surface, enhance the lubricating properties of the solid lubricating film material, and improve the temperature resistance of the solid lubricating film material , and a protective film with high shear strength can be formed between the turntable 13 and the support portion 12 . In the present invention, the content of sodium fluoride is 8wt%-15wt%, preferably 10wt%-14wt%.

Zirconium dioxide (chemical formula: ZrO2) is the main oxide of zirconium, usually in the form of white odorless and tasteless crystals, insoluble in water, hydrochloric acid and dilute sulfuric acid. The chemical properties are inactive, and it has the properties of high melting point, high resistivity, high refractive index and low thermal expansion coefficient, making it an important high temperature resistant material, ceramic insulating material and ceramic sunscreen, and the energy band gap is about 5eV～7eV.

Plasma sprayed zirconia thermal barrier coatings have made great progress in the application of aviation and industrial gas turbines, and have been used in the turbine part of gas turbines to a certain extent. Since the coating of the solid lubricating film material containing zirconia can reduce the temperature of air-cooled high-temperature components, the durability of the high-temperature component turntable 13 and the support portion 12 can be significantly improved. In the present invention, the content of zirconium dioxide is 25wt%-48wt%, preferably 31wt%-40wt%.

The adhesive is the guarantee of the bonding strength between other components in the solid lubricating film material and the contact surface. In addition to the glue, the adhesive also includes auxiliary components such as solvents, curing agents, toughening agents, preservatives, colorants, and defoamers. In addition to the most commonly used animal glue, the binder also includes synthetic resin, rubber and paint. During the relative friction between the turntable 13 and the supporting part 12, the binder increases the adsorption strength of the contact surface between other components in the solid lubricating film material and the metal material, and improves the durability and lubricating performance of the solid lubricating film material.

The metal sheet fatigue testing machine 10 for LED heat sinks drives the circular structure of the turntable 13 to rotate stably in the annular stopper 123 through the drive mechanism 11, and then drives the slider 152 to slide along the guide hole 132, so that the pull The bar 151 slides along the chute 142, so that the axial variable load in multiple directions is applied to the metal sheet connected with several braces 151, so that the force of the metal sheet in multiple directions is balanced, and the fatigue resistance of the metal sheet is improved. Accuracy of performance tests.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (5)

1. A sheet metal fatigue testing machine for LED radiators, comprising: a drive mechanism, a support portion, a turntable, a guide plate and a force application member; The support part is provided with an annular limit part, the turntable is rotatably arranged in the limit part, and the guide plate is fixedly connected with the support part, so that the turntable is accommodated in the support part and the support part. between the guide discs; The shaft centers of the support part, the turntable and the guide disk are respectively provided with through placement holes, through holes and accommodating holes; A plurality of guide holes are provided on the turntable, and the plurality of guide holes are arranged radially in a clockwise direction with respect to the axis of the turntable; The side of the guide plate facing the turntable is provided with a plurality of chute slots, and several of the chute slots are arranged radially with the axis of the guide disc; The force application member includes a pull bar and a slide block rotatably connected with the pull bar, the slide block is slidably arranged in the guide hole, and the pull bar is slidably arranged in the chute; the pull bar It includes a pull bar and a slide bar; the slide block is rotatably connected to the slide bar, the pull bar is connected to the end of the slide bar away from the slide block through bolts, and the bottom of the chute on the guide plate is provided with a bar-shaped hole , the pulling bar is slidably arranged along the bar-shaped hole; The driving mechanism is drivingly connected with the turntable, and is used to drive the slider to slide along the guide hole when the turntable is driven to rotate, so that the pull bar slides along the chute; The turntable and the support part are steel materials; the contact surface between the support part and the turntable is coated with a solid lubricating film material, and the solid lubricating film material is composed of the following components: 19wt% - 32wt% of the diameter is 28um - 71um cobalt, 13wt%-27wt% fluorinated graphite with a diameter of 30nm-56nm, 8wt%-15wt% sodium fluoride, 25wt%-48wt% zirconium dioxide, 10wt%-31wt% binder. 2 . The sheet metal fatigue testing machine for LED heat sinks according to claim 1 , wherein the support portion is a circular structure. 3 . 3. The sheet metal fatigue testing machine for LED radiators according to claim 1, wherein the turntable is a circular structure. 4. The sheet metal fatigue testing machine for LED heat sink according to claim 1, characterized in that, the guide plate has a circular structure. 5. The sheet metal fatigue testing machine for LED radiators according to claim 1, wherein the accommodating hole is circular.