CN220671116U

CN220671116U - Dynamic testing machine

Info

Publication number: CN220671116U
Application number: CN202322006937.7U
Authority: CN
Inventors: 宋晓; 姜永东; 郭坤勇; 牟俊惠
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2024-03-26
Anticipated expiration: 2033-07-27

Abstract

The utility model discloses a dynamic testing machine, which comprises a loading frame, wherein a bearing seat is fixed on the inner side of the bottom of the loading frame, an actuator is arranged above the bearing seat, a load sensor is arranged at the lower output end of the actuator, and a spherical pressure head is arranged on the load sensor; the top of actuator is connected with displacement sensor, is provided with the servo valve piece on the actuator, is provided with the servo valve on the servo valve piece, and the servo valve piece still is connected with first oil pipe mount pad and second oil pipe mount pad, and first oil pipe mount pad and second oil pipe mount pad all are connected with the diaphragm energy storage ware, and the second oil pipe mount pad also is connected with the diaphragm energy storage ware, and first oil pipe mount pad still is connected with high pressure filter. The utility model can realize static and dynamic load uniaxial compression experiments of materials such as coal and rock, analyze deformation characteristics, mechanical response, fracture and damage of the coal and rock under the action of dynamic load, and can meet the high-rigidity dynamic test requirements of rock high-rigidity test pieces from low frequency to high frequency.

Description

Dynamic testing machine

Technical Field

The utility model relates to the field of material tests, in particular to a dynamic testing machine.

Background

The dynamic mechanical properties of rock refer to mechanical properties such as deformation and damage of the rock under the action of variable load. The strain rate is often used to represent the severity of load changes, and the strain rates of rock in various operations in mines vary widely. Under the condition that the strain rate is increased, the dynamic elastic modulus of the rock and the dynamic strength of the rock are both increased, the plastic deformation is reduced, and the high-speed expanded cracks have a bifurcation trend. Conversely, rock rheology is common at very low strain rates. Under impact and shock loading conditions, the inertial deflection of rock particles is already significant, where the propagation and transreflection of stress waves in the rock must be considered. Reflection of waves at the rock free surface or corner often causes it to crack or collapse. Under very high impact loads, such as in the near-nuclear explosion zone. The effects related to rock strength are secondary and volumetric compression deformation and thermal coupling become their main features, where rock deformation resembles compressible fluids and causes permanent changes in the rock structure.

In order to meet the test conditions of higher requirements of a rock test piece, a rock dynamic testing machine with high load and high frequency is required, the main test object of the high-frequency dynamic testing machine which is common in the current application market is a material, the main structural form is in a column and beam form, such as a MTS Landmark series fatigue testing machine, and the maximum load is 500KN and the maximum frequency is 100Hz. The space position of the fatigue testing machine can be adjusted according to the type and the size of the test piece, and the fatigue testing machine has the defects of smaller rigidity and output load, is only suitable for the test piece with small rigidity such as metal or elastic structure, and can not meet the requirement of the test machine for large load for the rock test piece with higher hardness. Rock testing machines in the current application market, such as MTS815 series rock mechanical testing machines, can meet axial high-stress static loading, but cannot meet dynamic loading; for example, the GCTSRTR/RTX high-temperature high-pressure rock triaxial test machine can finish axial high-stress dynamic loading, but the loading frequency can only meet 10Hz at maximum.

In view of the above, there is a lack of a rock dynamic testing machine capable of satisfying both high load and high frequency, and in order to satisfy the requirement of high-rigidity dynamic testing from low frequency to high frequency for rock high-rigidity test pieces, it is necessary to provide a novel dynamic testing machine.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides a novel dynamic testing machine.

In order to achieve the aim of the utility model, the utility model adopts the following technical scheme: the device comprises a loading frame in a shape of a Chinese character kou, wherein a bearing seat is fixed on the inner side of the bottom of the loading frame, a through hole is formed above the bearing seat, an actuator is installed in the through hole, a load sensor is installed at the output end of the lower side of the actuator, a spherical pressure head is installed on the load sensor, a spherical pressure seat is arranged at the bottom of the spherical pressure head, and the spherical pressure seat is fixed on the loading frame through a plurality of third hexagon socket head bolts; the top of actuator is connected with displacement sensor, is provided with the servo valve piece on the actuator, is provided with the servo valve on the servo valve piece, and the servo valve piece still is connected with first oil pipe mount pad and second oil pipe mount pad, and the servo valve piece passes through second hexagon socket head cap screw with first oil pipe mount pad, second oil pipe mount pad and is connected with the diaphragm energy storage ware, and first oil pipe mount pad still is connected with high pressure filter.

Further, the actuator comprises a piston cylinder, an upper end cover, a lower end cover and a piston rod, wherein the upper end cover, the lower end cover and the piston cylinder form a hydraulic chamber, a piston part is arranged on the piston rod and is positioned in the hydraulic chamber, an upper end cover through hole matched with the piston rod is formed in the upper end cover, and a lower end cover through hole matched with the piston rod is formed in the lower end cover; the piston cylinder is also provided with an upper liquid inlet hole and a lower liquid inlet hole which are matched with the servo valve block.

Further, the upper liquid inlet hole is arranged at the upper side edge position of the hydraulic chamber, and the lower liquid inlet hole is arranged at the lower side edge position of the hydraulic chamber; the outer side of the top of the actuator is provided with a displacement sensor mounting seat, the displacement sensor mounting seat is fixed on the upper end cover, the displacement sensor is mounted in the displacement sensor mounting seat, the top of the displacement sensor mounting seat is also provided with a displacement sensor protective cover, and the displacement sensor protective cover is fixed on the displacement sensor mounting seat through screws; the upper end of the piston rod is also provided with a displacement sensor mounting blind hole for mounting a displacement sensor.

Further, an upper connecting channel and a lower connecting channel are arranged on the servo valve block; one end of the upper connecting channel is connected with the upper liquid inlet, and the other end is connected with the servo valve; one end of the lower connecting channel is connected with the lower liquid inlet, and the other end is connected with the servo valve; a first connecting channel which is communicated is arranged on the servo valve block and the first oil pipe mounting seat, one end of the first connecting channel is connected with the first oil pipe mounting seat, and the other end of the first connecting channel is connected with the servo valve; the servo valve block and the second oil pipe mounting seat are provided with a second connecting channel which is communicated with each other, one end of the second connecting channel is connected with the second oil pipe mounting seat, and the other end of the second connecting channel is connected with the servo valve; the servo valve block is also provided with two connecting auxiliary channels connected with the second connecting channel, and one ends of the two connecting auxiliary channels are communicated with the piston cylinder.

Further, a piston cylinder mounting flange is arranged at the bottom of the lower end cover, the piston cylinder mounting flange is connected with the lower end cover through a plurality of bolts, and the piston cylinder mounting flange is connected with the loading frame through a plurality of first inner hexagon bolts.

Further, the loading frame comprises an upper base, a lower base and two stand columns, wherein the upper base and the lower base are respectively fixed on the upper side and the lower side of the two stand columns to form a square shape, countersunk through holes are formed in the upper base and the lower base, threaded blind holes matched with the countersunk through holes are formed in the upper end and the lower end of the stand columns, and the upper base is connected with the stand columns and the lower base is connected with the stand columns through a plurality of bolts.

Further, an upper supporting plate is arranged at the bottom of the loading frame, two supporting leg mechanisms are arranged at the bottom of the upper supporting plate, each supporting leg mechanism comprises three vertical plates, side plates and a lower supporting plate, and the lower supporting plate, the side plates and the three vertical plates are welded and fixed; a panel is fixed between the two supporting leg mechanisms, a bottom plate is fixed at the bottom of the lower supporting plate, and the bottom plate is connected with the lower supporting plate through a third inner hexagon bolt.

Further, the load sensor is arranged at the output end of the actuator through a load sensor mounting seat; the load sensor mounting seat is annular, the cross section of the load sensor mounting seat is L-shaped, the L-shaped transverse section of the load sensor mounting seat is inward, and the load sensor mounting seat is connected with the spherical pressing seat through a plurality of screws.

Further, the spherical pressing seat is arranged on the spherical pressing head through the pressing cover, the spherical pressing head is provided with a connecting part connected with the load sensor, the spherical pressing head is provided with a step part clamped with the load sensor mounting seat, the bottom of the spherical pressing head is provided with an arc spherical surface part, and the upper end of the spherical pressing seat is provided with an arc spherical surface groove matched with the arc spherical surface part.

The beneficial effects of the utility model are as follows:

the utility model comprises a loading frame, an actuator and a servo valve, and is matched with a single-shaft compression tool, a deformation measuring device and the like, and the load or displacement is output through the actuator, so that the load or displacement loading is carried out on a test piece, and the deformation of the test piece is obtained. The loading frame adopts the high strength steel plate to assemble the mouth font frame that forms, and the actuator is overhead, and compression frock is including spherical pressure head, spherical pressure seat and bearing seat constitution, and spherical pressure head and spherical pressure seat are installed at the lower extreme output side of actuator, and the bearing seat is installed in the bottom inboard of loading frame, realizes load self-forming counter-force function.

The utility model adopts a steel plate assembly square frame with higher rigidity as a stress main body of a dynamic testing machine, a dynamic servo actuator is arranged on an upper beam of a loading frame, and a load is transferred to a lower beam of the loading frame through an output end at the lower side of the actuator, so that a stress closed stroke self-counterforce frame is formed.

The utility model has high load and high frequency, can be used for high-rigidity dynamic test of rock high-rigidity test pieces from low frequency to high frequency, can realize static and dynamic load single-axis compression experiments of materials such as coal and rock, and analyzes deformation characteristics, mechanical response, fracture and damage of the coal and rock under the action of dynamic load.

The stiffness and the mode of the utility model meet the experimental requirements, can realize static compression tests and dynamic vibration loading tests which meet the experimental requirements, and can meet test piece tests with various sizes by matching with a single-shaft compression tool, wherein the test piece is divided into a cylinder and a square, so the single-shaft compression tool comprises two or more single-shaft pressure heads, the pressure heads of corresponding test pieces are replaced simply, and the tests of different test pieces are realized by matching with the existing circular test piece deformation measuring device and square test piece measuring device.

The actuator adopts a double-acting mode, the tail end of the actuator is provided with a high-precision magneto displacement sensor for detecting and controlling the displacement of the actuator in real time, the front end of the actuator is provided with a tension-compression bidirectional fatigue load sensor for detecting the output load of the actuator, the actuator adopts a high-response dynamic servo valve for pressure control, various types of dynamic waveform output can be executed, and a complex working condition simulation experiment is executed. The use of the high-precision high-response dynamic servo valve ensures the loading dynamic frequency: 0.001-50 Hz, dynamic waveform: semi-normal waves, square waves, triangular waves, pure normal waves, random waves, saw tooth waves, etc.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a front view of the present utility model;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a schematic view of the structure of the spherical press seat, the press cover and the spherical press head;

FIG. 5 is a schematic diagram of a servo valve block section;

FIG. 6 is a schematic diagram of a servo valve block section;

FIG. 7 is a side view I of a servo valve block portion;

FIG. 8 is a cross-sectional view B-B in FIG. 6;

FIG. 9 is a second side view of a servo valve block portion;

FIG. 10 is a cross-sectional view of C-C of FIG. 8;

FIG. 11 is a schematic diagram of the operation of the present utility model;

wherein the symbols of the components are as follows:

6. a bottom plate; 7. a side plate; 8. a panel; 10. an upper support plate; 101. a riser; 102. lower support plate

9. Loading a frame; 91. an upper base; 92. a lower base; 93. a column; 94. a countersunk through hole;

11. a first socket head cap screw; 12. a first oil pipe mount; 13. a second socket head cap screw; 14. a diaphragm accumulator; 15. a servo valve; 17. a high pressure filter; 18. a second oil pipe mounting seat; 19. a third socket head cap screw; 20. a chassis;

21. a fourth socket head cap screw; 22. a bearing seat; 24. a spherical pressing seat; 241. an arc-shaped spherical groove; 25. a gland; 26. a spherical pressure head; 261. a connection part; 262. a step part; 263. an arc spherical surface portion; 27. a load sensor; 28. a load sensor mount;

29. an actuator; 291. a piston rod; 292. a piston cylinder; 293. an upper end cap; 294. a lower end cap; 295. a piston cylinder mounting flange; 296. a piston section; 2921. an upper liquid inlet hole; 2922. a lower liquid inlet hole;

30. a servo valve block; 301. an upper connecting channel; 302. a lower connection channel; 303. a first connection channel; 304. a second connection channel; 305. connecting the auxiliary channels;

31. a displacement sensor mounting seat; 32. a displacement sensor; 33. and a displacement sensor protective cover.

Detailed Description

The following description of the embodiments of the present utility model is provided to facilitate understanding of the present utility model by those skilled in the art, but it should be understood that the present utility model is not limited to the scope of the embodiments, and all the utility models which make use of the inventive concept are protected by the spirit and scope of the present utility model as defined and defined in the appended claims to those skilled in the art.

As shown in FIG. 1, the dynamic testing machine comprises a loading frame 9, the model of the dynamic testing machine is DPL-9010, a bearing seat 22 is fixed on the inner side of the bottom of the mouth-shaped loading frame 9, a through hole is arranged above the bearing seat 22, an actuator 29 is arranged in the through hole, a load sensor 27 is arranged at the lower output end of the actuator 29, the load sensor 27 is preferably MFT-200tTT, the top of the actuator 29 is connected with a displacement sensor 32, a servo valve block 30 is arranged on the actuator 29, a servo valve 15 is arranged on the servo valve block 30, and the servo valve 15 is preferably an ST-902HF-120 servo valve; the servo valve block 30 is further connected with a first oil pipe mounting seat 12 and a second oil pipe mounting seat 18, the servo valve block 30 is connected with the first oil pipe mounting seat 12 and the second oil pipe mounting seat 18 through second hexagon socket head cap bolts 13, the first oil pipe mounting seat 12 and the second oil pipe mounting seat 18 are both connected with a diaphragm accumulator 14, the diaphragm accumulator 14 is preferably MBSP-2.0, the first oil pipe mounting seat 12 is further connected with a high-pressure filter 17, and the high-pressure filter 17 is preferably DFB-H30X5. The servo valve 15 is preferably a british STAR three-stage servo valve 902HF-120 with rated flow up to 450lpm, the STAR series 902HF being a 3-stage, high flow servo valve for 3-way or 4-way applications in closed loop control systems of position, pressure or velocity, meeting the requirements of long-term fatigue testing.

As shown in fig. 2 and 3, the actuator 29 includes a piston cylinder 292, an upper end cover 293, a lower end cover 294, and a piston rod 291, wherein the upper end cover 293, the lower end cover 294, and the piston cylinder 292 form a hydraulic chamber, the piston rod 291 is provided with a piston portion 296, the piston portion 296 is located in the hydraulic chamber, the upper end cover 293 is provided with an upper end cover through hole that mates with the piston rod 291, and the lower end cover 294 is provided with a lower end cover through hole that mates with the piston rod 291; the piston cylinder 292 is further provided with an upper liquid inlet 2921 and a lower liquid inlet 2922 which are matched with the servo valve block 30. The actuator 29 may be a ZDQ/D2000 actuator having a loading pressure of 2000KN, or may be a ZDQ/D2000 actuator having a flying function.

The upper liquid inlet 2911 is arranged at the upper side edge position of the hydraulic chamber, and the lower liquid inlet 2922 is arranged at the lower side edge position of the hydraulic chamber; the outside of the top of the actuator 29 is provided with a displacement sensor mounting seat 31, the displacement sensor mounting seat 31 is fixed on an upper end cover 293, a displacement sensor 32 is mounted in the displacement sensor mounting seat 31, the top of the displacement sensor mounting seat 31 is also provided with a displacement sensor protective cover 33, and the displacement sensor protective cover 33 is fixed on the displacement sensor mounting seat 31 through screws; the upper end of the piston rod 291 is also provided with a displacement sensor mounting blind hole to which the displacement sensor 32 is mounted.

As shown in fig. 5, 6, 7, 8, 9 and 10, the servo valve block 30 is provided with an upper connection passage 301 and a lower connection passage 302; one end of the upper connecting passage 301 is connected with the upper liquid inlet, and the other end is connected with the servo valve 15; one end of the lower connecting channel 302 is connected with the lower liquid inlet, and the other end is connected with the servo valve 15; a first connecting channel 303 which is communicated is arranged on the servo valve block 30 and the first oil pipe mounting seat 12, one end of the first connecting channel 303 is connected with the first oil pipe mounting seat 12, and the other end is connected with the servo valve 15; a second connecting channel 304 communicated with the servo valve block 30 and the second oil pipe mounting seat 18 is arranged on the second oil pipe mounting seat 18, one end of the second connecting channel 304 is connected with the second oil pipe mounting seat 18, and the other end is connected with the servo valve 15; the servo valve block 30 is further provided with two connection sub-passages 305 connected to the second connection passage 304, and one ends of the two connection sub-passages 305 are communicated with the piston cylinder 292.

As shown in fig. 3, a piston cylinder mounting flange 295 is provided at the bottom of the lower end cover 294, the piston cylinder mounting flange 295 is connected with the lower end cover 294 through a plurality of bolts, and the piston cylinder mounting flange 295 is connected with the loading frame 9 through a plurality of first hexagon socket head cap bolts 11.

As shown in fig. 1, the loading frame 9 includes an upper base 91, a lower base 92 and two upright posts 93, the upper base 91 and the lower base 92 are respectively fixed on the upper side and the lower side of the two upright posts 93 to form a square shape, the upper base 91 and the lower base 92 are provided with countersunk through holes 94, the upper end and the lower end of the upright post 93 are provided with threaded blind holes matched with the countersunk through holes 94, and the upper base 91 and the upright posts 93 and the lower base 92 and the upright posts 93 are connected through a plurality of bolts.

The bottom of the loading frame 9 is provided with an upper supporting plate 10, the bottom of the upper supporting plate 10 is provided with two supporting leg mechanisms, each supporting leg mechanism comprises three vertical plates 101, a side plate 7 and a lower supporting plate 102, and the lower supporting plate 102, the side plate 7 and the three vertical plates 101 are welded and fixed; a panel 8 is fixed between the two supporting leg mechanisms, a bottom plate 6 is fixed at the bottom of the lower supporting plate 102, and the bottom plate 6 is connected with the lower supporting plate 102 through a third inner hexagon bolt 19.

As shown in fig. 4, a spherical pressure head 26 is mounted on the load sensor 27, a spherical pressure seat 24 is arranged at the bottom of the spherical pressure head 26, and the spherical pressure seat 24 is fixed on the loading frame 9 through a plurality of third hexagon socket head cap bolts 19. The load sensor 27 is mounted at the output end of the actuator 29 through a load sensor mount 28; the load sensor mounting seat 28 is annular, the cross section of the load sensor mounting seat 28 is L-shaped, the L-shaped transverse section of the load sensor mounting seat 28 is inward, and the load sensor mounting seat 28 is connected with the spherical pressure seat 24 through a plurality of screws. The spherical pressure seat 24 is arranged on the spherical pressure head 26 through the pressure cover 25, a connecting part 261 connected with the load sensor 27 is arranged on the spherical pressure head 26, a step part 262 clamped with the load sensor mounting seat 28 is arranged on the spherical pressure head 26, an arc spherical surface part 263 is arranged at the bottom of the spherical pressure head 26, and an arc spherical surface groove 241 matched with the arc spherical surface part 263 is arranged at the upper end of the spherical pressure seat 24.

The working principle and the process thereof are as follows: before the experiment, as shown in fig. 11, a servo oil source system is connected through a first oil pipe mounting seat 12 and a second oil pipe mounting seat 18, a test piece is placed on a bearing seat 22, a cylindrical test piece is taken as an example in the figure, a single-shaft compression tool corresponding to the test piece is installed on a spherical pressure seat 24 and the bearing seat 22, a deformation measuring device is arranged outside the test piece, the servo oil source system, a servo valve 15, a servo valve block 30, an actuator 29 and the like are matched together, a piston rod 291 drives a load sensor 27 to move downwards with the spherical pressure seat, the compression experiment of the test piece is realized, the load sensor 27 is used for detecting the load applied to the test piece in real time, and a displacement sensor 32 is used for detecting the vertical deformation displacement of the test piece in real time; threaded blind holes for installing test piece pressure heads are formed in the spherical pressure seat 24 and the bearing seat 22. The utility model can test a cylindrical test piece with phi of 50mm multiplied by 100mm, phi of 25mm multiplied by 50mm and phi of 100mm multiplied by 200 mm; 50mm×50mm×100mm, 100mm×100mm×200mm rectangular parallelepiped test piece; the uniaxial compression loading experiment pressure head 2 sleeve is provided, and can be used for experiments with the sizes of samples of 50mm in diameter and 100mm in diameter.

Claims

1. The dynamic testing machine is characterized by comprising a loading frame (9) in a shape of a Chinese character kou, wherein a bearing seat (22) is fixed on the inner side of the bottom of the loading frame (9), a through hole is formed above the bearing seat (22), an actuator (29) is arranged in the through hole, a load sensor (27) is arranged at the lower output end of the actuator (29), a spherical pressure head (26) is arranged on the load sensor (27), and a spherical pressure seat (24) is arranged at the bottom of the spherical pressure head (26);

the top of actuator (29) is connected with displacement sensor (32), be provided with servo valve piece (30) on actuator (29), be provided with servo valve (15) on servo valve piece (30), servo valve piece (30) still are connected with first oil pipe mount pad (12) and second oil pipe mount pad (18), first oil pipe mount pad (12) and second oil pipe mount pad (18) all are connected with diaphragm energy storage ware (14), first oil pipe mount pad (12) still are connected with high-pressure filter (17).

2. The dynamic testing machine according to claim 1, wherein the actuator (29) comprises a piston cylinder (292), an upper end cover (293), a lower end cover (294) and a piston rod (291), the upper end cover (293), the lower end cover (294) and the piston cylinder (292) form a hydraulic chamber, a piston part (296) is arranged on the piston rod (291), the piston part (296) is positioned in the hydraulic chamber, an upper end cover through hole matched with the piston rod (291) is arranged on the upper end cover (293), and a lower end cover through hole matched with the piston rod (291) is arranged on the lower end cover (294); the piston cylinder (292) is also provided with an upper liquid inlet hole (2921) and a lower liquid inlet hole (2922) which are matched with the servo valve block (30).

3. The dynamic testing machine of claim 2, wherein the upper liquid inlet (2921) is provided at an upper side edge position of the hydraulic chamber, and the lower liquid inlet (2922) is provided at a lower side edge position of the hydraulic chamber; the outer side of the top of the actuator (29) is provided with a displacement sensor mounting seat (31), the displacement sensor mounting seat (31) is fixed on an upper end cover (293), a displacement sensor (32) is mounted in the displacement sensor mounting seat (31), the top of the displacement sensor mounting seat (31) is also provided with a displacement sensor protection cover (33), and the displacement sensor protection cover (33) is fixed on the displacement sensor mounting seat (31) through screws; the upper end of the piston rod (291) is also provided with a displacement sensor mounting blind hole for mounting the displacement sensor (32).

4. The dynamic testing machine according to claim 1, wherein an upper connecting channel (301) and a lower connecting channel (302) are arranged on the servo valve block (30); one end of the upper connecting channel (301) is connected with the upper liquid inlet, and the other end is connected with the servo valve (15); one end of the lower connecting channel (302) is connected with the lower liquid inlet hole, and the other end of the lower connecting channel is connected with the servo valve (15); a first connecting channel (303) which is communicated is arranged on the servo valve block (30) and the first oil pipe mounting seat (12), one end of the first connecting channel (303) is connected with the first oil pipe mounting seat (12), and the other end of the first connecting channel is connected with the servo valve (15); the servo valve block (30) and the second oil pipe mounting seat (18) are provided with a second connecting channel (304) which is communicated, one end of the second connecting channel (304) is connected with the second oil pipe mounting seat (18), and the other end of the second connecting channel is connected with the servo valve (15).

5. The dynamic testing machine according to claim 2, wherein a piston cylinder mounting flange (295) is arranged at the bottom of the lower end cover (294), the piston cylinder mounting flange (295) is connected with the lower end cover (294) through a plurality of bolts, and the piston cylinder mounting flange (295) is connected with the loading frame (9) through a plurality of first hexagon socket head cap bolts (11).

6. The dynamic testing machine according to claim 1, wherein the loading frame (9) comprises an upper base (91), a lower base (92) and two stand columns (93), the upper base (91) and the lower base (92) are respectively fixed on the upper side and the lower side of the two stand columns (93) to form a square shape, countersunk through holes (94) are formed in the upper base (91) and the lower base (92), threaded blind holes matched with the countersunk through holes (94) are formed in the upper end and the lower end of the stand columns (93), and the upper base (91) and the stand columns (93) are connected through a plurality of bolts.

7. The dynamic testing machine according to claim 1, wherein an upper supporting plate (10) is arranged at the bottom of the loading frame (9), two supporting leg mechanisms are arranged at the bottom of the upper supporting plate (10), each supporting leg mechanism comprises three vertical plates (101), side plates (7) and a lower supporting plate (102), and the lower supporting plate (102), the side plates (7) and the three vertical plates (101) are welded and fixed; a panel (8) is fixed between the two supporting leg mechanisms, a bottom plate (6) is fixed at the bottom of the lower supporting plate (102), and the bottom plate (6) is connected with the lower supporting plate (102) through a third inner hexagon bolt (19).

8. The dynamic testing machine according to claim 1, wherein the load cell (27) is mounted at the output of the actuator (29) by means of a load cell mounting (28); the load sensor mounting seat (28) is annular, the cross section of the load sensor mounting seat (28) is L-shaped, the L-shaped transverse section of the load sensor mounting seat (28) is inward, and the load sensor mounting seat (28) is connected with the spherical pressing seat (24) through a plurality of screws.

9. The dynamic testing machine according to claim 8, wherein the spherical pressing seat (24) is mounted on the spherical pressing head (26) through a pressing cover (25), a connecting portion (261) connected with a load sensor (27) is arranged on the spherical pressing head (26), a step portion (262) clamped with the load sensor mounting seat (28) is arranged on the spherical pressing head (26), an arc-shaped spherical surface portion (263) is arranged at the bottom of the spherical pressing head (26), and an arc-shaped spherical surface groove (241) matched with the arc-shaped spherical surface portion (263) is arranged at the upper end of the spherical pressing seat (24).