CN108896390A - A kind of minute yardstick double-shaft two-way loading tester - Google Patents

Abstract

The invention provides a micro-scale biaxial bidirectional loading testing machine, which includes a frame platform assembly, a tension mechanism assembly, a load measurement assembly, a clamp assembly and a strain measurement assembly; the tension mechanism assembly is installed on the frame platform assembly through bolts , the tension mechanism assembly and the load measurement assembly are fixed through screw fit, the grating scale and the linear guide rail of the load measurement assembly are fixed on the frame platform assembly by bolts, the load measurement assembly and the fixture assembly are connected by pins, and the strain measurement assembly is by bolts It is fixed on the frame platform assembly; the present invention can select fixtures of different sizes and different range sensors according to different test loads, which is convenient for installation and disassembly, and can realize non-contact strain measurement and experimental load measurement at the same time; simple structure, manufacturability Well, it has the value of popularization and application.

Description

A micro-scale biaxial bidirectional loading testing machine

technical field

The invention designs a micro-scale biaxial bidirectional loading testing machine, which can be used to test materials, especially for the mechanical properties of thin plates with a thickness of 0.02-0.4mm under the tension state of double bearings, which belongs to engineering materials and physical properties. , Mechanical experiment technology field.

Background technique

In recent years, with the increasingly prominent problems of environmental pollution and energy shortage, the market demand for micro-products has increased significantly, and more and more micro-formed parts are used in microelectronics, automobiles, aviation and medical fields. Microforming inherits the advantages of traditional plastic processing technology, but when the size of the material is reduced to a certain extent, its industrial application is limited due to many problems such as scale effect, increased frictional resistance, and difficulty in precise positioning. The yield strengthening behavior of materials at the micro-scale is the basis for accurately describing the micro-forming process, and it is also a hot frontier issue in international research. At present, widely used yield criteria such as Mises and Hill series are still used to predict the yield behavior of micro-formed materials, and the applicability of yield criteria at the micro scale is not considered.

The biaxial tensile test of the cross-shaped specimen can conveniently control the load or displacement ratio of the two axes to obtain different stress-strain states in the central area of the specimen, and then obtain any yield point in the biaxial tensile area under different loading paths. Therefore, the cross-shaped biaxial tensile test has become the most effective experimental method to study the yield behavior of sheet metal. At present, there is no report on the biaxial tensile testing machine used to study the micro-scale yield strengthening behavior, so the validity of the yield criterion at the macro scale has been lacking in experimental verification at the micro scale. For this reason, this paper invented a micro-scale biaxial bidirectional loading test machine, which can realize the deformation of the foil under the complex loading path, solve the problem of lack of biaxial loading test equipment and high cost of the foil, and provide a micro-scale yield behavior Research provides technical support.

Contents of the invention

(1. Purpose

The purpose of the present invention is to provide a micro-scale biaxial bidirectional loading testing machine to study the mechanical properties such as the yield behavior of metal foil materials at the micro-scale. It has the advantages of four-axis independent drive, easy disassembly, simple transmission and high test accuracy. It can cooperate with CCD camera to observe the strain of the sample during the bidirectional loading process. Combined with the stress-strain measurement system and motion control system, it can collect and control the load/displacement/strain signals of uniaxial/biaxial tension, and calculate the stress-strain curves of the biaxial in two directions in different loading tests. It can be used to study the mechanical properties of foil materials.

(2) Technical solution

The present invention is a micro-scale biaxial bidirectional loading testing machine, which includes a frame platform assembly, a tension mechanism assembly, a load measurement assembly, a clamp assembly and a strain measurement assembly; the positional relationship between them is: the tension mechanism assembly Installed on the frame platform assembly by bolts, the tension mechanism assembly and the load measurement assembly are fixed through screw fit, the grating ruler (31) and the linear guide rail of the load measurement assembly are fixed on the frame platform assembly by bolts, the load measurement assembly and The fixture assembly is connected by pins (27), and the strain measurement assembly is fixed on the frame platform assembly by bolts;

The frame platform assembly includes a frame (1) and a shockproof platform (13); their mutual relationship is: the frame (1) and the shockproof platform (13) are connected to each other, such as by bolts, etc. ;

The shape and structure of the frame (1) is as follows: first cut out a specific length of aluminum profile, and then welded into a truss structure;

The shape and structure of the anti-vibration platform (13) is: using a steel plate to be processed into a cross shape;

Described stretching mechanism assembly comprises fixed support base (21), servo electric cylinder (19), and servo motor (18) etc.; The cylinder trunnion (20) is hinged with the fixed support base (21), has a certain rotation margin, and can realize quick installation and disassembly; the synchronous belt transmission mechanism (17) fixedly connected to the servo motor (18) and the servo electric cylinder (19) ) are fixed by bolts;

The shape and structure of the fixed support base (21) is: L-shaped, the bottom surface is drilled and connected to the anti-vibration platform (13) by bolts, and the side has a connecting hole that matches the electric cylinder trunnion (20);

This servo electric cylinder (19) selects existing product for use, and its model is Limtec IMB40;

This servomotor (18) selects existing product for use, and its model is Siemens servomotor 1FK7033;

There are four stretching mechanism components, which are stretching mechanism component I (2), stretching mechanism component II (6), stretching mechanism component III (12) and stretching mechanism component IV (16);

The four stretching mechanism components I (2), II (6), III (12), and IV (16) have the same structure, and the four stretching mechanisms are arranged orthogonally to form four electric loading ends, wherein The stretching mechanism component I (2) and the stretching mechanism component III (12) are respectively arranged in opposite positions in the same direction; the stretching mechanism component II (6) and the stretching mechanism component IV (16) are arranged in the vertical direction relative position;

The load measurement assembly includes a linear guide rail I (22), a guide rail slider I (23), a linear guide rail II (24), a guide rail slider II (25), a grating ruler connector (30), a grating ruler (31) , force sensor (28), sliding base (29), etc.;

The relationship between them is: the vertical surface of the force sensor (28) and the sliding base (29) is fixed by bolts; the sliding base (29) and the guide rail slider I (27) and the guide rail slider II (25) pass Screws are fixed; the two ends of the grating ruler connector (30) are respectively connected with the sliding base (29) and the reading head of the grating ruler (31) with screws; the guide rail slider I (23) and the guide rail slider II (25) It can slide on the linear guide rail I (22) and the linear guide rail II (24) respectively;

The structure of the linear guide rail I (22) is the same as that of the linear guide rail II (24), and the existing product is selected, and its model is HGR25;

The guide rail slider I (23) has the same structure as the guide rail slider II (25), and the existing product is selected, and its model is HGH25CA square slider;

The shape and structure of the grating ruler connector (30) is: four holes are drilled on the square plate, two holes are connected with the reading head of the grating ruler (31), and two holes are connected with the sliding base (29);

This grating ruler (31) selects existing product for use, and its model is Xinnuo KA300;

This force sensor (28) selects existing product for use, and its model is HBM U10M;

The shape and structure of the sliding base (29) is: L-shaped, the eight holes on the bottom surface are connected with the guide rail slider I (23) and the guide rail slider II (25) through screws, and the side center hole and the servo electric cylinder (19) protrude from the shaft. Through threaded connection, eight holes are evenly distributed around the central hole on the side to connect with the force sensor (28) by bolts;

There are four load measurement components of the bidirectional loading testing machine, which are load measurement component I (3), load measurement component II (7), load measurement component III (11) and load measurement component IV (15);

The four load measuring components I (3), II (7), III (11), and IV (15) have the same structure, which can realize quick installation and disassembly;

The four stretching mechanism components and the four load measuring components are respectively connected in series;

The fixture assembly includes: mechanical fixture body (37), fixture connecting shaft (35), fixture knob I (38), fixture knob II (41), fixture splint I (39), fixture splint II (40), etc.; The relationship between them is: the clamp connection shaft (35) is connected with the clamp installation shaft (32) by a pin (33); the clamp installation shaft (32) is threadedly connected with the mechanical clamp body (37); the clamp knob Ⅰ (38) is threadedly connected with the fixture knob II (41) and the mechanical fixture body (37); the fixture splint I (39) is hinged on the fixture knob I (38), and the fixture splint II (40) is hinged on the fixture knob II (41) on;

The shape and structure of the mechanical clamp body (37) is: a C-shaped block structure, the threaded holes on its side are used for the threaded connection of the clamp connecting shaft (35), and the threaded holes on its upper and lower bottom surfaces are used for the threaded connection of the clamp knob;

The shape and structure of the clamp connecting shaft (35) is: the shape is a cylinder, one end is threaded for connecting the mechanical clamp body (37), and the other end is processed in a through hole perpendicular to the axial direction, and is installed with the clamp through a pin (33). Shaft (32) connection;

The fixture knob I (38) has the same structure as the fixture knob II (41), and its shape and structure are: a cylindrical body in the shape of a boss is processed, threads are processed on the outer cylindrical surface of a smaller diameter, and the end is a support seat, and the larger Knurling on the outer cylindrical surface of the diameter;

The fixture splint I (39) has the same structure as the fixture splint II (40), and its shape and structure are: one side of the square plate is a friction surface, and the other side is a boss for hinged connection of the fixture knob support seat;

There are four clamp components, which are clamp component I (5), clamp component II (8), clamp component III (10) and clamp component IV (14); the four clamp components I (5), Ⅱ(8), Ⅲ(10), Ⅳ(14) have the same structure;

The four load measuring components and the four fixture components are respectively connected in series to realize rapid installation and disassembly;

Described strain measuring assembly comprises camera frame (4) and CCD camera (9), their mutual relation is: CCD camera (9) is installed on the camera frame (4) by screw;

The shape and structure of the camera frame (4) is as follows: firstly, an aluminum profile of a specific length is cut out, and then welded into a truss structure, which has the characteristics of high rigidity and light weight;

This CCD camera (9) selects existing product for use, and its model is STINGRAY F145B.

(3) Advantages and efficacy

1. The present invention adopts the design form of quick-change clamps, and clamps of different sizes can be selected according to different test loads.

2. The present invention adopts the design form of rapid replacement of sensors, and different range sensors can be selected according to different loads.

3. The electric cylinder of the present invention adopts a trunnion connection method to increase the rotation margin, adapt to the impact of external loads, and facilitate installation and disassembly.

4. The CCD camera (9) and force sensor (28) adopted in the present invention can simultaneously realize non-contact strain measurement and experimental load measurement.

5. The structure is simple, the manufacturability is good, and it has the value of popularization and application.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the present invention.

The specific labels in the figure are as follows:

1 Frame 2 Tensile Mechanism Component Ⅰ 3 Load Measurement Component Ⅰ 4 Camera Frame

5 Fixture assembly Ⅰ 6 Tension mechanism assembly Ⅱ 7 Load measurement assembly Ⅱ 8 Fixture assembly Ⅱ

9 CCD camera 10 Fixture assembly Ⅲ 11 Load measurement assembly Ⅲ 12 Tensile mechanism assembly Ⅲ

13 Anti-vibration platform 14 Fixture assembly Ⅳ 15 Load measurement assembly Ⅳ 16 Tensile mechanism assembly Ⅳ

Fig. 2 is a schematic front view of the stretching mechanism assembly of the present invention.

The numbers in the figure are as follows:

17 Timing Belt Drive 18 Servo Motor 19 Servo Electric Cylinder 20 Electric Cylinder Trunnion

21 Fixed support base

Fig. 3 is a schematic diagram of the three-dimensional structure of the load measuring assembly of the present invention.

The numbers in the figure are as follows:

22 Linear guide Ⅰ 23 Guide slider Ⅰ 24 Linear guide Ⅱ 25 Guide slider Ⅱ

26 Bushing 27 Pin 28 Force Transducer 29 Sliding Base

30 Scale adapter 31 Scale

Fig. 4 is a schematic front view of the clamp assembly of the present invention.

The numbers in the figure are as follows:

32 Fixture mounting shaft 33 Pin 34 Fastening nut Ⅰ 35 Fixture connecting shaft

36 Fastening nut Ⅱ 37 Fixture main body 38 Fixture knob Ⅰ 39 Fixture splint Ⅰ

40 Fixture splint Ⅱ 41 Fixture knob Ⅱ

Detailed ways

See Fig. 1-Fig. 4, a kind of micro-scale biaxial two-way loading testing machine of the present invention, it has included frame platform assembly, tensile mechanism assembly, load measurement assembly, fixture assembly and strain measurement assembly; Their mutual position The relationship is: the tension mechanism component is installed on the frame platform component through bolts, the tension mechanism component and the load measurement component are fixed through thread fit, and the grating ruler (31) and the linear guide rail of the load measurement component are fixed on the frame platform through bolts Assemblies, the load measurement assembly is connected with the fixture assembly through pins (27), and the strain measurement assembly is fixed on the frame platform assembly by bolts.

See Fig. 1, the rack platform comprises frame (1) and anti-vibration platform (13); ) with its upper surface in a horizontal position;

The shape and structure of the frame (1) is as follows: first cut out a specific length of aluminum profile, and then welded into a truss structure;

The shape structure of this anti-shock platform (13) is: use steel plate to process into cross shape;

See Fig. 2, stretching mechanism assembly comprises fixed support base (21), servo electric cylinder (19), and servo motor (18) etc.; The cylinder trunnion (20) is hinged with the fixed support base (21), so that the servo electric cylinder (19) has a certain rotation margin, which can realize quick installation and disassembly; the servo motor (18) and the servo electric cylinder (19) are fixedly connected The synchronous belt transmission mechanism (17) is fixed by bolts;

The shape and structure of the fixed support base (21) is: L-shaped, the bottom surface is drilled and the anti-vibration platform is connected by bolts, and the side has a connection hole matched with the electric cylinder trunnion (20);

This servo electric cylinder (19) selects existing product for use, and its model is Limtec IMB40;

This servomotor (18) selects existing product for use, and its model is Siemens servomotor 1FK7033;

As shown in Figure 1, there are four stretching mechanism components, namely stretching mechanism component I (2), stretching mechanism component II (6), stretching mechanism component III (12) and stretching mechanism component IV (16) ;

As shown in Figure 1, the four stretching mechanism components Ⅰ (2), Ⅱ (6), Ⅲ (12), and Ⅳ (16) have the same structure, and the four stretching mechanisms are arranged orthogonally to form four electric loading ends. . The active direction of the biaxial stretching and the driven direction are perpendicular to the horizontal plane, and the stretching mechanism component I (2) and the stretching mechanism component III (12) are respectively arranged on the relative positions of the active direction of the bidirectional stretching, and the stretching mechanism component II (6) and the stretching mechanism component IV (16) are respectively arranged in opposite positions in the active direction of the bidirectional stretching. During the experiment, the four stretching mechanism components are controlled separately, the displacements of the movement axes of the two stretching mechanism components servo electric cylinders (19) in the active direction are equal, and the two stretching mechanism components servo electric cylinders (19) move in the driven direction The displacement of the axis is equal;

As shown in Figure 3, the load measurement assembly includes linear guide rail I (22), guide rail slider I (23), linear guide rail II (24), guide rail slider II (25), grating ruler connector (30), grating ruler (31 ), force sensor (28), sliding base (29) etc.; Their mutual relation is: the vertical plane of force sensor (28) and sliding base (29) is fixed by bolt, and sliding base (29) uses screw and guide rail The slider I (23) and the guide rail slider II (25) are fixed, and the two ends of the grating ruler connector (30) are respectively fixed with the reading heads of the sliding base (29) and the grating ruler (31) with screws;

The structure of the linear guide rail I (22) is the same as that of the linear guide rail II (24), and the existing product is selected, and its model is HGR25;

The guide rail slider I (23) has the same structure as the guide rail slider II (25), and the existing product is selected, and its model is HGH25CA square slider;

The shape structure of this grating ruler connector (30) is: four holes are drilled on the square plate, two holes are used to be connected with the reading head of grating ruler (31), and two holes are used to be connected with sliding base (29);

This grating ruler (31) selects existing product for use, and its model is Xinnuo KA300;

This force sensor (28) selects existing product for use, and its model is HBM U10M;

The shape and structure of the sliding base (29) is: L-shaped, the eight holes on the bottom surface are respectively connected with the guide rail slider I (23) and the guide rail slider II (25) through screws, and the center hole on the side protrudes from the servo electric cylinder (19). The shaft is connected by threads, and the eight holes evenly distributed around the side center hole are connected with the force sensor (28) by bolts;

As shown in Figure 1, there are four load measurement components, namely load measurement component I (3), load measurement component II (7), load measurement component III (11) and load measurement component IV (15); their mutual assembly relationship Yes: the force sensor (28) is connected to the sliding base (29) by screws, which is convenient for installation and disassembly; the structures of the four load measuring components I (3), II (7), III (11), and IV (15) are the same;

As shown in Figure 4, the fixture assembly includes: mechanical fixture body (37), fixture connecting shaft (35), fixture knob I (38), fixture knob II (41), fixture splint I (39), fixture splint II (40), etc. The relationship between them is: the clamp connecting shaft (35) is connected with the clamp installation shaft (32) by the pin (33); 38) is threadedly connected with the fixture knob II (41) and the mechanical fixture body (37), the fixture splint I (39) is hinged on the fixture knob I (38), and the fixture splint II (40) is hinged on the fixture knob II (41) superior. By rotating the clamp knob Ⅰ (38) and the clamp knob Ⅱ (41), the clamp splint Ⅰ (39) and the clamp splint II (40) can be moved up and down respectively, and the sheet can be clamped or unloaded;

The shape and structure of the mechanical clamp body (37) is: a C-shaped block structure, the threaded holes on its side are used for the threaded connection of the clamp connecting shaft (35), and the threaded holes on its upper and lower bottom surfaces are used for the threaded connection of the clamp knob;

The shape and structure of the clamp connecting shaft (35) is: the shape is a cylinder, one end is threaded for connecting the mechanical clamp body (37), and the other end is processed in a vertical axis direction through a through hole, and the pin (33) is connected to the clamp body to install the shaft. (32) connection;

The shape and structure of the clamp knob I (38) and the clamp knob II (41) are: a cylindrical body in the shape of a boss is processed, a thread is processed on the outer cylindrical surface of a smaller diameter, and the end is a support seat, and the outer cylindrical surface of a larger diameter face knurling;

The shape and structure of the fixture splint I (39) and the fixture splint II (40) are: one side of the square plate is a friction surface, and the other side is a boss used for the hinge of the fixture knob support seat;

As shown in Figure 1, there are four fixture assemblies, namely fixture assembly I (5), fixture assembly II (8), fixture assembly III (10) and fixture assembly IV (14); four fixture assemblies I (5), Ⅱ(8), Ⅲ(10), and Ⅳ(14) have the same structure; four load measuring components and four fixture components are respectively connected in series, which can realize quick installation and disassembly;

See Fig. 1, strain measuring assembly comprises camera frame (4) and CCD camera (9); Their mutual relation is: CCD camera (9) is installed on the camera frame (4) by screw;

The shape and structure of the camera frame (4) is as follows: first cut an aluminum profile of a specific length, and then weld it into a truss structure;

This CCD camera (9) selects existing product for use, and its model is STINGRAY F145B.

The specific experimental method mainly includes the following steps:

Step 1: Firstly, for the speckle treatment of the biaxially stretched sample, start the testing machine and the CCD camera (9), and adjust the appropriate focal length.

Second step: manually control the servo motors (18) of the four stretching mechanism assemblies, so that the four clamp assemblies can move to a suitable position capable of clamping the sheet material.

Step 3: Adjust the clamp knob I (38) and clamp knob II (41) of the four clamp components, so that the clamp splint I (39) and the clamp splint II (40) press the sheet metal sample. Then start the experiment, automatically control the four-axis synchronous movement through the program, and at the same time collect the load measurement value of the force sensor (28) and save the speckle image obtained by the CCD camera (9) at the corresponding moment during the experiment.

Step 4: At the end of the experiment, adjust the clamp knob I (38) and clamp knob II (41) of the four clamp components to separate the clamp splint I (39) from the fixture splint II (40), take out the sample, and turn off the testing machine.

The component size, material selection, and process method of this device can be determined for different applications, including the height and width of the rack, the parameters of the tension sensor, the length and type of the linear guide, the size of the fixture, the height of the camera holder, and the CCD camera. resolution.

Claims (2)

1. A micro-scale biaxial bidirectional loading testing machine is characterized in that: it includes a frame platform assembly, a tension mechanism assembly, a load measurement assembly, a clamp assembly and a strain measurement assembly; the tension mechanism assembly is mounted on the machine by bolts On the rack platform assembly, the tensile mechanism assembly and the load measurement assembly are fixed through screw fit, the grating ruler (31) and the linear guide rail of the load measurement assembly are fixed on the rack platform assembly by bolts, and the load measurement assembly and the fixture assembly are fixed by pins. (27) connection, the strain measurement assembly is fixed on the frame platform assembly by bolts; The frame platform assembly includes a frame (1) and an anti-vibration platform (13); the frame (1) and the anti-vibration platform (13) are connected to each other; The shape and structure of the frame (1) is as follows: first cut out a specific length of aluminum profile, and then welded into a truss structure; The shape and structure of the anti-vibration platform (13) is: using a steel plate to be processed into a cross shape; The stretching mechanism assembly includes a fixed support base (21), a servo electric cylinder (19), and a servo motor (18); The base (21) is hinged and has a predetermined rotation margin, which can realize quick installation and disassembly; the synchronous belt transmission mechanism (17) which is connected to the servo motor (18) and the servo electric cylinder (19) is fixed by bolts; The fixed support base (21) is: L-shaped, the bottom surface is drilled and connected to the anti-vibration platform (13) by bolts, and the side has a connection hole matched with the electric cylinder trunnion (20); This servo electric cylinder (19) selects existing product for use; This servomotor (18) selects existing product for use; There are four stretching mechanism components, which are stretching mechanism component I (2), stretching mechanism component II (6), stretching mechanism component III (12) and stretching mechanism component IV (16); The four stretching mechanism components I (2), II (6), III (12), and IV (16) have the same structure, and the four stretching mechanisms are arranged orthogonally to form four electric loading ends, wherein The stretching mechanism component I (2) and the stretching mechanism component III (12) are respectively arranged in opposite positions in the same direction; the stretching mechanism component II (6) and the stretching mechanism component IV (16) are arranged in the vertical direction relative position; The load measurement assembly includes a linear guide rail I (22), a guide rail slider I (23), a linear guide rail II (24), a guide rail slider II (25), a grating ruler connector (30), a grating ruler (31) , force sensor (28) and sliding base (29); The force sensor (28) and the vertical surface of the sliding base (29) are fixed by bolts; the sliding base (29) and the guide rail slider I (27) and the guide rail slider II (25) are fixed by screws; the grating ruler connector The two ends of (30) are respectively connected with the reading heads of the sliding base (29) and the grating ruler (31) with screws; the guide rail slider I (23) and the guide rail slider II (25) respectively Slide on the linear guide rail II (24); The structure of the linear guide rail I (22) is the same as that of the linear guide rail II (24), and an existing product is selected; The structure of the guide rail slider I (23) is the same as that of the guide rail slider II (25), and an existing product is selected; The square plate of this grating ruler connector (30) is drilled with four holes, and two holes are connected with the reading head of grating ruler (31), and two holes are connected with sliding base (29); This grating ruler (31) selects existing product for use; This force sensor (28) selects existing product for use; The sliding base (29) is: L-shaped, the eight holes on the bottom surface are connected with the guide rail slider I (23) and the guide rail slider II (25) through screws, and the center hole on the side is connected with the extension shaft of the servo electric cylinder (19) through threads , eight holes are evenly distributed around the side center hole to be connected with the force sensor (28) by bolts; The load measuring assembly of the described bidirectional loading testing machine is provided with four, respectively load measuring assembly I (3), the four load measuring assemblies I (3), II (7), III (11), IV ( 15) The structure is the same, which can realize quick installation and disassembly; The four stretching mechanism components and the four load measuring components are respectively connected in series; The clamp assembly includes: mechanical clamp body (37), clamp connecting shaft (35), clamp knob I (38), clamp knob II (41), clamp splint I (39) and fixture splint II (40); The clamp connecting shaft (35) is connected with the clamp installation shaft (32) through a pin (33); the clamp installation shaft (32) is threaded with the mechanical clamp body (37); the clamp knob I (38) is connected with the clamp knob II ( 41) It is threadedly connected with the mechanical clamp body (37); the clamp splint I (39) is hinged on the clamp knob I (38), and the clamp splint II (40) is hinged on the clamp knob II (41); The mechanical clamp body (37) is: a C-shaped block structure, and its side is provided with a threaded hole for the threaded connection of the clamp connecting shaft (35), and its upper and lower bottom surfaces are provided with threaded holes for the threaded connection of the clamp knob; The shape of the clamp connecting shaft (35) is a cylinder, one end of which is threaded for connecting the mechanical clamp body (37), and the other end is processed in a direction perpendicular to the axis through a through hole, through the pin (33) and the clamp installation shaft (32) connect; The fixture knob I (38) has the same structure as the fixture knob II (41). It is processed into a cylindrical body in the shape of a boss, and threads are processed on the outer cylindrical surface of the small diameter, and the end is a support seat. face knurling; The fixture splint I (39) and the fixture splint II (40) have the same structure, one side of the square plate is a friction surface, and the other side is a boss used for the hinge of the fixture knob support seat; There are four clamp components, which are clamp component I (5), clamp component II (8), clamp component III (10) and clamp component IV (14); the four clamp components I (5), Ⅱ(8), Ⅲ(10), Ⅳ(14) have the same structure; The four load measuring components and the four fixture components are respectively connected in series to realize fast installation and disassembly; Described strain measuring assembly comprises camera frame (4) and CCD camera (9), and this CCD camera (9) is installed on the camera frame (4) by screw; The shape and structure of the camera frame (4) is as follows: firstly cut an aluminum profile with a specific length, and then weld it into a truss structure, which has the characteristics of high rigidity and light weight; This CCD camera (9) selects existing product for use. 2. A kind of micro-scale biaxial bidirectional loading testing machine according to claim 1, characterized in that: the frame (1) and the anti-vibration platform (13) in the described frame platform assembly are passed through each other Bolted.