Sample Fixture and Metal Testing Equipment

Abstract

The present invention discloses a sample fixture and a metal testing device, relating to the technical field of workholding fixtures. The sample fixture includes a first connecting member, a second connecting member, a third connecting member and a pressing member. The first connecting member, the second connecting member and the third connecting member are sequentially rotatably connected. Both the first connecting member and the third connecting member can deflect to the same side of the second connecting member and jointly clamp a fixed seat of the metal testing device with the second connecting member. Both ends of the pressing member can be respectively connected to the first connecting member and the third connecting member and are used to jointly clamp a sample to be tested with a testing gun of the metal testing device, wherein the testing gun is connected to the fixed seat. The sample fixture and the metal testing device have the characteristics of improving the testing stability and making the testing safer.

Description

Technical Field

[0001] The present invention relates to the technical field of tooling fixtures, and more particularly, to a sample fixture and a metal testing device. Background Art

[0002] The development of human civilization and the progress of society are closely related to metal materials. After the Stone Age, the Bronze Age and the Iron Age emerged, both marked by the application of metal materials. In modern times, a wide variety of metal materials have been applied to all aspects of human life. In production and life, the detection of metal materials directly affects the quality of the products produced.

[0003] Since the existing metal material detection requires holding the sample to be tested by hand during the test, the experimental progress is slow and there are certain safety hazards to the human body. During the specific test, since there is no special fixture to hold the sample to be tested stably, and the tester directly holds the sample to be tested by hand, there are problems such as inaccurate test results and great safety hazards during the test. Because when the existing DC spectrometer tests the sample to be tested, it sprays electric sparks on the sample to be tested for sampling and testing. If the sample to be tested is held by hand during the test, it is easy to be sprayed by the electric sparks, which poses a certain safety hazard to the tester.

[0004] In view of this, it is particularly important to develop and design a sample fixture and a metal testing device that can solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a sample fixture, which has the characteristics of improving the test stability and being safer during the test.

[0006] Another purpose of the present invention is to provide a metal testing device, which has the characteristics of improving the test stability and being safer during the test.

[0007] The present invention provides a technical solution:

[0008] In a first aspect, an embodiment of the present invention provides a sample fixture, which includes a first connecting member, a second connecting member, a third connecting member and a pressing member; the first connecting member, the second connecting member and the third connecting member are sequentially rotatably connected, and both the first connecting member and the third connecting member can deflect to the same side of the second connecting member and jointly clamp a fixed seat of a metal testing device with the second connecting member; both ends of the pressing member can be respectively connected to the first connecting member and the third connecting member and are used to jointly clamp a sample to be tested with a testing gun of the metal testing device, wherein the testing gun is connected to the fixed seat.

[0009] In combination with the first aspect, in the first implementation manner of the first aspect, both the first connecting member and the third connecting member include a sliding connection portion and a fixing portion. The fixing portion is detachably connected to the corresponding sliding connection portion. The two sliding connection portions are respectively rotatably connected to both ends of the second connecting member, and can be connected to both ends of the pressing member, and can deflect to the same side of the second connecting member; the fixing portion is used to jointly clamp the fixing seat with the second connecting member when the two sliding connection portions deflect to the same side of the second connecting member, and the fixing portion can extend into the fixing seat.

[0010] In combination with the first aspect and its above implementation manners, in the second implementation manner of the first aspect, connection sliding grooves are formed on both of the two sliding connection portions, and the connection sliding grooves extend along the extending direction of the sliding connection portions; fixing bumps are protruded on the fixing portion, and the fixing bumps can be slidably connected to the connection sliding grooves and can be locked by bolts.

[0011] In combination with the first aspect and its above implementation manners, in the third implementation manner of the first aspect, the two connection sliding grooves respectively extend to the ends of the corresponding sliding connection portions, and the connection sliding grooves are T-shaped grooves.

[0012] In combination with the first aspect and its above implementation manners, in the fourth implementation manner of the first aspect, two pressing bumps are protruded on the pressing member; the two pressing bumps can be respectively slidably connected in the two connection sliding grooves and can be locked by bolts.

[0013] In combination with the first aspect and its above implementation manners, in the fifth implementation manner of the first aspect, the second connecting member includes a first rotating portion and a second rotating portion that are rotatably connected to each other; the first connecting member, the first rotating portion, the second rotating portion, and the third connecting member are sequentially rotatably connected. The first rotating portion and the second rotating portion extend in the same direction, and the second rotating portion can rotate around the straight line where the extending direction of the first rotating portion is located; both the first connecting member and the third connecting member can rotate towards the straight line where the first rotating portion is located and respectively abut against the first rotating portion and the second rotating portion.

[0014] In combination with the first aspect and its above implementation manners, in the sixth implementation manner of the first aspect, the first connecting member and the third connecting member can respectively abut against the opposite sides of the second connecting member.

[0015] In combination with the first aspect and its above implementation manners, in the seventh implementation manner of the first aspect, the connection manners of the first connecting member and the first rotating portion and the third connecting member and the second rotating portion are both hinged, and the axes of rotation of each are arranged in parallel.

[0016] Combined with the first aspect and its above implementation manners, in the eighth implementation manner of the first aspect, the first connecting member and / or the third connecting member are further provided with a receiving notch, and in the receiving notch, the pressing member protrudes with a receiving protrusion, and the receiving protrusion can be arranged in the receiving notch.

[0017] In a second aspect, an embodiment of the present invention provides a metal testing device, including a device main body, a fixing base, a testing gun, and the sample fixture as described above. The sample fixture includes a first connecting member, a second connecting member, a third connecting member, and a pressing member. The first connecting member, the second connecting member, and the third connecting member are sequentially rotatably connected. Both the first connecting member and the third connecting member can deflect to the same side of the second connecting member and jointly clamp the fixing base of the metal testing device with the second connecting member. Both ends of the pressing member can be respectively connected to the first connecting member and the third connecting member and are used to jointly clamp a sample to be tested with the testing gun of the metal testing device. Among them, the testing gun is connected to the fixing base. The fixing base is installed on the device main body, the testing gun is connected to the device main body and is connected to the fixing base. The first connecting member, the second connecting member, and the third connecting member jointly clamp the fixing base, and the pressing member can jointly clamp the sample to be tested with the testing gun.

[0018] Compared with the prior art, the beneficial effects of the sample fixture and the metal testing device provided by the embodiments of the present invention are as follows:

[0019] The first connecting member, the second connecting member, and the third connecting member are sequentially rotatably connected. Moreover, both the first connecting member and the third connecting member can deflect to the same side of the second connecting member. In other words, the deflected first connecting member, third connecting member, and second connecting member are approximately located in the same plane, and both the first connecting member and the third connecting member are located on the same side of the second connecting member, so that the first connecting member, the second connecting member, and the third connecting member can jointly clamp the fixing base. Both ends of the pressing member can be respectively connected to the first connecting member and the third connecting member to maintain the distance between the first connecting member and the third connecting member. Moreover, it can also be used to jointly clamp the sample to be tested with the testing gun on the fixing base, so as to clamp the sample to be tested between the testing gun and the pressing member. In this way, the pressing member is installed by the first connecting member, the second connecting member, and the third connecting member that clamp the fixing base, and the pressing member can jointly clamp the sample to be tested with the testing gun, so as to keep the position of the sample to be tested stable relative to the testing gun, facilitate the testing gun to stably test the sample to be tested, and moreover, after the sample to be tested is clamped by the sample fixture, there is no need for the tester to manually stabilize the sample to be tested, making the testing process safer.

[0020] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specifically provides preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0022] Figure 1 Schematic structural diagram of the sample fixture provided by the embodiment of the present invention applied to a metal testing device.

[0023] Figure 2 Schematic structural diagram of the sample fixture provided by the embodiment of the present invention clamped to a fixed seat.

[0024] Figure 3 Schematic structural diagram of the sample fixture provided by the embodiment of the present invention in a clamped state.

[0025] Figure 4 Schematic structural diagram of the sample fixture provided by the embodiment of the present invention in a stored state.

[0026] Figure 5 Schematic cross-sectional structural diagram of the sample fixture provided by the embodiment of the present invention in a stored state.

[0027] Reference Signs: 100 - Metal testing device; 20 - Device main body; 30 - Testing gun; 40 - Fixed seat; 10 - Sample fixture; 12 - First connecting member; 121 - Sliding connection portion; 1211 - Connection chute; 1212 - Storage accommodation notch; 122 - Fixing portion; 1221 - Fixing protrusion; 15 - Second connecting member; 151 - First rotating portion; 152 - Second rotating portion; 17 - Third connecting member; 19 - Pressing member; 191 - Pressing protrusion; 192 - Storage protrusion; 900 - Sample to be tested. Detailed Embodiments

[0028] To make the objects, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures. The orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the inventive product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention. Terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance. The term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0030] It should also be noted that unless otherwise clearly specified and defined, terms such as "arrange", "connect", etc. should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The following will describe in detail the specific embodiments of the present invention with reference to the figures.

[0032] Embodiment:

[0033] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of a sample fixture 10 provided by an embodiment of the present invention applied to a metal testing device 100.

[0034] An embodiment of the present invention provides a sample fixture 10, which is used to clamp a sample to be tested 900 to assist the metal testing device 100 in completing the testing work on the sample to be tested 900, and has the characteristics of improving the testing stability and making the testing safer. The sample fixture 10 can be applied to metal testing devices 100 such as direct current spectrometers.

[0035] Among them, taking the sample fixture 10 applied to the metal testing device 100 as an example, the metal testing device 100 includes the above-mentioned sample fixture 10, a device main body 20, a testing gun 30, and a fixing base 40. The fixing base 40 is installed on the device main body 20, the testing gun 30 is connected to the device main body 20, and moreover, the testing gun 30 is connected to the fixing base 40. The sample fixture 10 is clamped on the fixing base 40 and can be used together with the testing gun 30 to clamp the sample to be tested 900, so as to complete the fixation of the sample to be tested 900.

[0036] Since the metal testing device 100 adopts the sample fixture 10 provided by the embodiment of the present invention, the metal testing device 100 also has the characteristics of being able to improve the testing stability and being safer in testing.

[0037] The following will specifically introduce the structural composition, working principle, and beneficial effects of the sample fixture 10 provided by the embodiment of the present invention.

[0038] Please refer to Figure 2 and Figure 3 , Figure 2 which is a schematic structural diagram of the sample fixture 10 provided by the embodiment of the present invention clamped on the fixing base 40. Figure 3 which is a schematic structural diagram of the sample fixture 10 provided by the embodiment of the present invention in a clamped state.

[0039] The sample fixture 10 includes a first connecting member 12, a second connecting member 15, a third connecting member 17, and a pressing member 19. The first connecting member 12, the second connecting member 15, and the third connecting member 17 are used to jointly clamp the fixing base 40, so as to facilitate the installation of the sample fixture 10 on the fixing base 40. The pressing member 19 is used to clamp the sample to be tested 900 together with the testing gun 30, so as to facilitate the testing gun 30 to stably test the sample to be tested 900, and there is no need for the tester to manually stabilize the sample to be tested 900.

[0040] Specifically, the first connecting member 12, the second connecting member 15, and the third connecting member 17 are sequentially rotatably connected, and moreover, both the first connecting member 12 and the third connecting member 17 can deflect to the same side of the second connecting member 15. In other words, the deflected first connecting member 12, the third connecting member 17, and the second connecting member 15 are substantially in the same plane, and both the first connecting member 12 and the third connecting member 17 are located on the same side of the second connecting member 15, so that the first connecting member 12, the second connecting member 15, and the third connecting member 17 can jointly clamp on the fixing base 40. The two ends of the pressing member 19 can be respectively connected to the first connecting member 12 and the third connecting member 17 to maintain the distance between the first connecting member 12 and the third connecting member 17, and can also be used to jointly clamp the sample to be tested 900 with the testing gun 30 on the fixing base 40. Or rather, the pressing member 19 can be oppositely arranged with the testing gun 30, so as to facilitate clamping the sample to be tested 900 between the testing gun 30 and the pressing member 19.

[0041] In this way, the pressing member 19 is installed by means of the first connecting member 12, the second connecting member 15 and the third connecting member 17 clamped to the fixing base 40, and the pressing member 19 can clamp the sample to be tested 900 together with the test gun 30, so as to keep the position of the sample to be tested 900 stable relative to the test gun 30, so that the test gun 30 can stably test the sample to be tested 900. Moreover, after the sample fixture 10 clamps the sample to be tested 900, there is no need for the tester to manually stabilize the sample to be tested 900, making the test process safer.

[0042] It should be noted that, in this embodiment, the first connecting member 12 and the third connecting member 17 are hung on the fixing base 40 and clamped to the fixing base 40 together with the second connecting member 15 to be connected to the fixing base 40. In other embodiments, the first connecting member 12 and the third connecting member 17 can also be connected to the fixing base 40 by jointly clamping the fixing base 40 from left and right. In addition, the surface of the pressing member 19 facing the test gun 30 is preferably a flat surface to facilitate clamping the sample to be tested 900 with the test gun 30. Moreover, the position where the pressing member 19 abuts is rounded to facilitate the tester to adjust the position of the pressing member 19.

[0043] Specifically, the first connecting member 12 and the third connecting member 17 can also each include a sliding connection portion 121 and a fixing portion 122. The fixing portion 122 is detachably connected to the corresponding sliding connection portion 121. The two sliding connection portions 121 are respectively rotatably connected to both ends of the second connecting member 15, and can be connected to both ends of the pressing member 19, and can deflect on the same side of the second connecting member 15. Or rather, the fixing portions 122 and the pressing member 19 can be respectively connected to the sliding connection portions 121 of the first connecting member 12 and the third connecting member 17, and are also respectively rotatably connected to both ends of the second connecting member 15.

[0044] Among them, the fixing portion 122 is used to clamp the fixing base 40 together with the second connecting member 15 when the two sliding connection portions 121 deflect on the same side of the second connecting member 15. In other words, the fixing portion 122 corresponds to the second connecting member 15, and the two respectively abut against the fixing base 40 from above and below the fixing base 40. In this way, the first connecting member 12, the second connecting member 15 and the third connecting member 17 respectively fix the fixing base 40 by means of the surrounding stirrups of the fixing base 40, improving the stability of the sample fixture 10.

[0045] Furthermore, the fixing part 122 can extend into the fixing base 40. Or rather, the fixing part 122 is curved, connected to the corresponding sliding connection part 121, and extends from the connection part towards the inside of the fixing base 40. Or rather, the fixing part 122 extends from the connection part with the corresponding sliding connection part 121 towards the second connecting part 15, so as to hook the fixing base 40 when jointly clamping the fixing base 40 with the second connecting part 15, further improving the stability of the sample clamp 10.

[0046] Furthermore, connection sliding grooves 1211 can be provided on both of the two sliding connection parts 121. And the connection sliding grooves 1211 extend along the extending direction of the sliding connection parts 121. Or rather, the sliding connection parts 121 are strip-shaped, and the connection sliding grooves 1211 extend along the length direction of the sliding connection parts 121. And fixing bumps 1221 protrude on the fixing part 122. The fixing bumps 1221 can be slidably connected to the connection sliding grooves 1211 and can be locked by bolts, so as to facilitate adjusting the position of the fixing part 122 relative to the second connecting part 15, and facilitating the fixing part 122, the sliding connection part 121 and the second connecting part 15 to clamp the fixing base 40.

[0047] In addition, two pressing bumps 191 can also protrude on the pressing part 19. The two pressing bumps 191 can be respectively slidably connected into the two connection sliding grooves 1211 and can be locked by bolts, so as to facilitate adjusting the distance between the pressing part 19 and the testing gun 30, so as to facilitate the metal testing device 100 to test the samples 900 to be tested with different sizes.

[0048] It should be noted that, in this embodiment, the above two connection sliding grooves 1211 respectively extend to the ends of the corresponding sliding connection parts 121. And the connection sliding grooves 1211 are both T-shaped grooves. The fixing protrusions and the pressing bumps 191 can both slide into the connection sliding grooves 1211 from the ends of the sliding connection parts 121. And in other embodiments, the connection sliding grooves 1211 can also be straight grooves or sliding ways. In addition, connection holes (not marked in the figure) are provided on the bottom walls of the connection sliding grooves 1211. Bolts connect the fixing part 122 and the pressing part 19 to the sliding connection part 121 through the connection holes. And the bolts used are preferably knurled nuts, so as to facilitate the tester to manually tighten and loosen the bolts.

[0049] Please refer to Figure 4 and Figure 5 , Figure 4 which is the schematic structural diagram of the sample clamp 10 provided by the embodiment of the present invention in the storage state. Figure 5 which is the schematic sectional structural diagram of the sample clamp 10 provided by the embodiment of the present invention in the storage state.

[0050] The second connecting part 15 can also be a rotating structure including a first rotating part 151 and a second rotating part 152 which are rotatably connected to each other.

[0051] Among them, the first connecting member 12, the first rotating portion 151, the second rotating portion 152, and the third connecting member 17 are sequentially rotatably connected. The first rotating portion 151 and the second rotating portion 152 extend in the same direction. Or rather, the rotatably connected first rotating portion 151 and second rotating portion 152 are in a straight line. And the second rotating portion 152 can rotate around the straight line where the extending direction of the first rotating portion 151 is located. In other words, the rotating shafts (not marked in the figure) of the first rotating portion 151 and the second rotating portion 152 are arranged along the above-mentioned straight line, so that both the first rotating portion 151 or the second rotating portion 152 can rotate around the above-mentioned straight line, or rather rotate around itself. And both the first connecting member 12 and the third connecting member 17 can rotate towards the straight line where the first rotating portion 151 is located. Or rather, both the first connecting member 12 and the second connecting member 15 can deflect towards the same side in space of the first rotating portion 151 and the second rotating portion 152, so that the first connecting member 12 and the second connecting member 15 are respectively abutted against the first rotating portion 151 and the second rotating portion 152. In this way, the folding and storage of the first connecting member 12, the second connecting member 15, and the third connecting member 17 can be completed to save storage space.

[0052] Furthermore, during storage, the first connecting member 12 and the third connecting member 17 can respectively abut against the opposite sides of the second connecting member 15. In this way, without loosening the bolts, the first connecting member 12 and the third connecting member 17 can respectively be closely abutted against the second connecting member 15, further improving the convenience of storage.

[0053] It should be noted that the connection methods of the first connecting member 12 and the first rotating portion 151, and the third connecting member 17 and the second rotating portion 152 are both hinged, and the respective rotating shafts are arranged in parallel to limit the movement of the first connecting member 12 and the third connecting member 17 in a relatively stable plane, facilitating the storage and clamping of the fixing seat 40. And the rotation angle range of the above two hinge positions is 270 degrees, so that when the first connecting member 12 and the third connecting member 17 deflect to the same side of the second connecting member 15, the first connecting member 12 and the third connecting member 17 are both perpendicular to the second connecting member 15, facilitating the installation of the pressing member 19 and improving the installation convenience.

[0054] The first connecting member 12 and the third connecting member 17 can also be respectively provided with storage accommodation notches 1212, and the pressing member 19 can also be provided with a storage protrusion 192. The storage protrusion 192 can be arranged in the storage accommodation notch 1212 to facilitate the connection with the pressing member 19 when the three connecting members are in the storage state, so as to facilitate the taking and placing of the sample fixture 10.

[0055] It should be noted that, in this embodiment, the storage accommodation notch 1212 is located on the same side of the first connecting member 12 and the third connecting member 17 corresponding to the two connecting chutes 1211. The number of the storage protrusions 192 is two, and they can be respectively arranged in the connecting chutes 1211 and the storage accommodation notch 1212, so as to be connected to the pressing member 19 when the three connecting members are in the storage state, facilitating the taking and placing of the sample fixture 10. In addition, in other embodiments, the storage accommodation notch 1212 can also be only arranged on the first connecting member 12 and the third connecting member 17.

[0056] The working principle of the sample fixture 10 provided by the embodiment of the present invention is as follows:

[0057] The first connecting member 12, the second connecting member 15 and the third connecting member 17 are sequentially rotatably connected. Moreover, both the first connecting member 12 and the third connecting member 17 can deflect on the same side of the second connecting member 15. In other words, after deflection, the first connecting member 12, the third connecting member 17 and the second connecting member 15 are substantially located in the same plane, and both the first connecting member 12 and the third connecting member 17 are located on the same side of the second connecting member 15, so that the first connecting member 12, the second connecting member 15 and the third connecting member 17 can jointly clamp on the fixed seat 40. The two ends of the pressing member 19 can be respectively connected to the first connecting member 12 and the third connecting member 17 to maintain the distance between the first connecting member 12 and the third connecting member 17. Moreover, it can also be used to jointly clamp the sample to be tested 900 with the test gun 30 on the fixed seat 40. Or rather, the pressing member 19 can be arranged opposite to the test gun 30 to facilitate clamping the sample to be tested 900 between the test gun 30 and the pressing member 19. In this way, the pressing member 19 is installed by the first connecting member 12, the second connecting member 15 and the third connecting member 17 clamped on the fixed seat 40, and the pressing member 19 can clamp the sample to be tested 900 together with the test gun 30, so as to keep the position of the sample to be tested 900 stable relative to the test gun 30, facilitating the test gun 30 to stably test the sample to be tested 900. And after the sample to be tested 900 is clamped by the sample fixture 10, it is not necessary for the tester to manually stabilize the sample to be tested 900, making the test process safer.

[0058] To sum up:

[0059] The embodiment of the present invention provides a sample fixture 10, which has the characteristics of improving the test stability and making the test safer.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the features in the above embodiments can be combined with each other without conflict, and the present invention can also have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. Moreover, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A sample fixture, characterized in that, It includes a first connecting piece, a second connecting piece, a third connecting piece and a pressing piece; The first connecting piece, the second connecting piece and the third connecting piece are sequentially rotatably connected. Both the first connecting piece and the third connecting piece can deflect to the same side of the second connecting piece and jointly clamp the fixing seat of the metal testing equipment with the second connecting piece; Both ends of the pressing piece can be respectively connected to the first connecting piece and the third connecting piece and are used to jointly clamp the sample to be tested with the testing gun of the metal testing equipment, wherein the testing gun is connected to the fixing seat; The second connecting piece includes a first rotating part and a second rotating part that are rotatably connected to each other; The first connecting piece, the first rotating part, the second rotating part and the third connecting piece are sequentially rotatably connected. The first rotating part and the second rotating part extend in the same direction, and the second rotating part can rotate around the straight line where the extending direction of the first rotating part is located; Both the first connecting piece and the third connecting piece can rotate towards the straight line where the first rotating part is located and respectively abut against the first rotating part and the second rotating part; The first connecting piece and the third connecting piece can respectively abut against the opposite sides of the second connecting piece; The connection methods between the first connecting piece and the first rotating part and between the third connecting piece and the second rotating part are both hinged, and the axes of rotation of each are parallel to each other.

2. The sample jig according to claim 1, characterized in that, Both the first connecting piece and the third connecting piece include a sliding connection part and a fixing part. The fixing part is detachably connected to the corresponding sliding connection part. The two sliding connection parts are respectively rotatably connected to both ends of the second connecting piece, can be connected to both ends of the pressing piece, and can deflect to the same side of the second connecting piece; The fixing part is used to jointly clamp the fixing seat with the second connecting piece when the two sliding connection parts deflect to the same side of the second connecting piece, and the fixing part can extend into the fixing seat; 3. The sample fixture according to claim 2, characterized in that, Both of the two sliding connection parts are provided with connection chutes, and the connection chutes extend along the extending direction of the sliding connection parts; The fixing part is convexly provided with a fixing bump, and the fixing bump can be slidably connected to the connection chute and can be locked by a bolt; 4. The sample jig according to claim 3, wherein The two connection chutes respectively extend to the ends of the corresponding sliding connection parts, and the connection chutes are T-shaped grooves; 5. The sample fixture according to claim 4, characterized in that, The pressing piece is convexly provided with two pressing bumps; The two pressing bumps can be respectively slidably connected into the two connection chutes and can be locked by bolts; 6. The sample fixture according to claim 1, characterized in that, The first connecting piece and / or the third connecting piece are further provided with a storage accommodation notch. The pressing piece is convexly provided with a storage bump, and the storage bump can be arranged in the storage accommodation notch.

7. A metal testing device, characterized in that, It includes an equipment main body, a fixing seat, a testing gun and the sample fixture according to any one of claims 1-6; The fixing base is installed on the device main body, the test gun is connected to the device main body and is connected to the fixing base, the first connecting piece, the second connecting piece and the third connecting piece jointly clamp the fixing base, and the pressing piece can jointly clamp a sample to be tested with the test gun.

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