A triaxial force loading device for elastic model compliance coefficient test

Abstract

The application belongs to the technical field of wind tunnel test, and discloses a three-axis force loading device for flexibility coefficient test of an elastic model. The device is a square frame body, comprising a base assembly, a support section assembly and a mounting plate assembly which are stacked in sequence from bottom to top, and a Y-direction sliding frame and an X-direction sliding frame which are vertically crossed and are installed on the inner wall of the mounting plate assembly; the loading assembly is a cylindrical rod body which is located on the vertical central axis of the device, and the lower end of the loading assembly is fixed on the base assembly, and the upper end of the loading assembly extends out of the mounting plate assembly at the intersection of the X-direction and Y-direction sliding frames; the X-direction and Y-direction driving assemblies respectively drive the X-direction sliding frame to slide along the X-direction and the Y-direction sliding frame to slide along the Y-direction through linear guide rails, and drive the upper end of the loading assembly to perform a conical column movement to adjust the loading direction, and meanwhile, the top end of the loading assembly is driven by a driving motor installed on the base assembly to extend upward to increase the loading force value. The device can achieve the measurement target of nine-component flexibility coefficients of the elastic model, and has engineering practical value.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel testing technology, specifically relating to a triaxial force loading device for testing the compliance coefficient of an elastic model. Background Technology

[0002] The elastic model compliance coefficient testing equipment based on a uniaxial force loading device can only perform force loading in one direction, and therefore can only measure the compliance coefficient in one direction. In reality, the structural compliance coefficient is a tensor containing nine components: C xx , C xy , C xz ; C yx , C yy , C yz ; C zx , C zy , C zz。 in, C xx It represents the deformation in the X direction measured at a certain location of the structure after being subjected to a unit load in the X direction. C xy This represents the deformation in the Y direction measured at a specific location on the structure after a unit load is applied in the X direction; the rest can be deduced similarly. Traditional compliance coefficient testing equipment applies a single force, such as the X direction. Even with a three-dimensional deformation measurement device capable of measuring elastic deformation in the X, Y, and Z directions, only the deformation in the X, Y, and Z directions can be obtained. C xx , C xy , C xz It is impossible to obtain the other 6 components.

[0003] Currently, there is an urgent need to develop a triaxial force loading device suitable for testing the compliance coefficient of an elastic model, so as to obtain the complete nine-component compliance coefficient of the elastic model. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a triaxial force loading device for testing the compliance coefficient of an elastic model, so as to overcome the defects of the prior art.

[0005] The triaxial force loading device for testing the flexibility coefficient of an elastic model of the present invention is a square frame, including a square base assembly, a support section assembly and a mounting plate assembly stacked from bottom to top. A vertically intersecting Y-axis sliding frame and an X-axis sliding frame are installed on the inner wall of the mounting plate assembly. The loading component is a cylindrical rod located on the vertical central axis of the triaxial force loading device. The lower end of the loading component is fixed to the base assembly, and the upper end of the loading component extends from the bottom to the top of the mounting plate assembly at the intersection of the X-axis sliding frame and the Y-axis sliding frame. The X-axis drive component drives the X-axis sliding frame to slide along the X-axis via a linear guide rail, and the Y-axis drive component drives the Y-axis sliding frame to slide along the Y-axis via a linear guide rail. This causes the upper end of the loading component to move in a conical-cylindrical motion to adjust the loading direction of the loading component. At the same time, the drive motor installed on the base assembly drives the top of the loading component to extend upward to increase the loading force value.

[0006] Furthermore, the base assembly includes a square base plate and a locking plate stacked sequentially from bottom to top. The lower surface of the base plate is provided with two parallel slider plates, which are inserted into corresponding grooves on the ground. The upper surface of the base plate is provided with a grating connecting plate and two parallel upright plates. An electric cylinder mounting plate parallel to the base plate is covered on the two parallel upright plates. Install a grating on the grating connection plate; measure the relative position of the triaxial force loading device through the grating; adjust the relative position of the triaxial force loading device by sliding the slider plate in the groove until the triaxial force loading device moves to the preset position.

[0007] Furthermore, the support segment assembly is a cube, including a bottom support segment plate at the bottom and a top support segment plate at the top; the left and right sides are support segment side plates I, and the front and rear sides are support segment side plates II; vertical square tubes are provided along the central symmetry line of the inner wall of each support segment side plate I and support segment side plate II to increase structural strength. The support section assembly is fixed to the locking plate of the base assembly via the support section base plate.

[0008] Furthermore, the mounting plate assembly has X-end vertical plates on both the left and right sides, and the upper surface of the X-end vertical plates on both sides is an upper connecting plate; the inner wall of the X-end vertical plate on the right side is provided with an X-end horizontal plate and an X-end guide rail mounting plate, and the lower surface of the X-end vertical plates on both the left and right sides is a lower connecting plate; the front and rear sides are Y-end vertical plates, and the inner wall of the rear Y-end vertical plate is provided with a Y-end horizontal plate and a Y-end guide rail mounting plate. The mounting plate assembly is fixed to the top plate of the support section assembly via screw holes on the lower surface.

[0009] Furthermore, the X-axis drive assembly and the Y-axis drive assembly have the same structure, both including a motor, a reducer, a drive coupling, and a lead screw and nut pair connected in sequence, with both ends of the lead screw and nut pair supported by fixed supports; wherein, the central axes of the motor and the reducer coincide, the central axes of the drive coupling and the lead screw and nut pair coincide, and the two central axes are perpendicular; The motor of the X-axis drive assembly is fixed on the X-end vertical plate, and the motor of the Y-axis drive assembly is fixed on the Y-end vertical plate.

[0010] Furthermore, the X-axis sliding frame is a rectangular frame. The left inner wall of the X-axis sliding frame is provided with a sliding groove I, and the right inner wall is provided with a sliding groove II corresponding to the sliding groove I. Both sliding groove I and sliding groove II are arc grooves. The front end face of the X-axis sliding frame is provided with a downwardly extending X-grating connecting section, on which the X-axis grating is fixed. The rear end face is provided with a downwardly extending X-screw nut connecting section, on which a through hole is provided for connection with the screw nut pair of the X-axis drive assembly. The Y-axis sliding frame is also a rectangular frame. The front inner wall of the Y-axis sliding frame is provided with a sliding groove IV, and the rear inner wall is provided with a sliding groove III corresponding to the sliding groove IV. Both sliding groove IV and sliding groove III are arc grooves. The left end face of the X-axis sliding frame is provided with a downwardly extending Y-axis lead screw nut connecting section. The Y-axis lead screw nut connecting section is provided with a through hole for connecting to the lead screw nut pair of the Y-axis drive assembly. The right end face is provided with a downwardly extending Y-axis grating connecting section, and the Y-axis grating is fixed on the Y-axis grating connecting section.

[0011] Furthermore, the linear guide rail includes an X-axis linear guide rail and a Y-axis linear guide rail; There are two X-axis linear guides, which are symmetrical from left to right. One is fixed to the X-end guide rail mounting plate, and the other is fixed to the X-end vertical plate. Each X-axis linear guide has a slider embedded in it. The left and right ends of the X-axis sliding frame slide along the X-axis linear guide through the slider. There are also two Y-direction linear guides, which are symmetrical front and back. One is fixed to the Y-end vertical plate, and the other is fixed to the Y-end guide mounting plate. Each Y-direction linear guide has a slider embedded in it. The front and rear faces of the Y-direction sliding frame slide along the Y-direction linear guide through the slider.

[0012] Furthermore, the main body of the loading component is a loading rod; The upper section of the loading rod is fixed from bottom to top with double moving ball II, double moving ball I, a triaxial sensor, and a loading head assembly. The triaxial sensor is fixed by a sensor flange. Double moving ball II is inserted into sliding groove IV and sliding groove III of the Y-direction sliding frame, and double moving ball I is inserted into sliding groove I and sliding groove II of the X-direction sliding frame. The loading head assembly includes a loading plug, a loading ball rod, and a loading ball head connected from bottom to top. The loading plug is fixed to the top surface of the triaxial sensor by a number of screws evenly distributed along the circumference. The lower end of the loading rod is connected to the loading electric cylinder, which is fixed on the electric cylinder mounting plate of the base assembly. The drive motor is mounted on the locking plate of the base assembly and drives the loading electric cylinder.

[0013] The triaxial force loading device for testing the compliance coefficient of an elastic model of the present invention can perform multi-directional force loading, and the adjustment method is convenient. Combined with a three-dimensional deformation measurement device, it can achieve the target of measuring the compliance coefficient of nine components of the elastic model, and has practical engineering value. Attached Figure Description

[0014] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0015] Figure 1a This is a schematic diagram (perspective view) of the triaxial force loading device for testing the compliance coefficient of an elastic model according to the present invention. Figure 1b This is a schematic diagram (top view) of the triaxial force loading device for testing the compliance coefficient of an elastic model according to the present invention. Figure 2 This is a schematic diagram of the cone-shaped cylinder motion range of the loading component in the triaxial force loading device for testing the flexibility coefficient of an elastic model according to the present invention. Figure 3a This is a schematic diagram (perspective view - top view) of the base assembly in the triaxial force loading device for testing the flexibility coefficient of an elastic model according to the present invention. Figure 3b This is a structural schematic diagram (perspective view - bottom view) of the base assembly in the triaxial force loading device for testing the flexibility coefficient of an elastic model according to the present invention. Figure 4 This is a schematic diagram of the support segment assembly in the triaxial force loading device for testing the flexibility coefficient of an elastic model according to the present invention. Figure 5a This is a structural schematic diagram (top) of the mounting plate assembly in the triaxial force loading device for testing the flexibility coefficient of an elastic model according to the present invention. Figure 5b This is a schematic diagram (bottom) of the mounting plate assembly in the triaxial force loading device for testing the flexibility coefficient of an elastic model according to the present invention. Figure 6 This is a schematic diagram of the drive component in the triaxial force loading device for testing the compliance coefficient of an elastic model according to the present invention. Figure 7 This is a schematic diagram of the X-direction sliding frame in the triaxial force loading device for testing the flexibility coefficient of an elastic model according to the present invention. Figure 8This is a schematic diagram of the Y-axis sliding frame in the triaxial force loading device for testing the compliance coefficient of an elastic model according to the present invention. Figure 9 This is a schematic diagram of the linear guide rail installation in the triaxial force loading device for testing the compliance coefficient of an elastic model according to the present invention. Figure 10 This is a schematic diagram of the loading component in the triaxial force loading device for testing the compliance coefficient of an elastic model according to the present invention. Figure 11 This is a schematic diagram of the loading head assembly in the triaxial force loading device for testing the compliance coefficient of an elastic model according to the present invention.

[0016] In the diagram, 1. Loading component; 2. Base component; 3. Support section component; 4. Mounting plate component; 5. X-axis drive component; 6. X-axis sliding frame; 7. Y-axis drive component; 8. Y-axis sliding frame; 9. Linear guide rail; 201. Base plate; 202. Locking plate; 203. Electric cylinder mounting plate; 204. Slider mounting plate; 205. Vertical plate; 206. Grating connecting plate; 301. Support section bottom plate; 302. Support section top plate; 303. Support section side plate I; 304. Support section side plate II; 305. Rectangular tube; 401. X-end vertical plate; 402. X-end horizontal plate; 403. X-end guide rail mounting plate; 404. Lower connecting plate; 405. Upper connecting plate; 406. Y-end vertical plate; 407. Y-end horizontal plate; 408. Y-end guide rail mounting plate; 501. Reducer; 502. Screw and nut pair; 503. Fixed support; 504. Drive coupling; 505. Motor; 601. Sliding groove I; 602. Sliding groove II; 603. X-ray grating connecting section; 604. X-ray screw and nut connecting section; 901. X-axis linear guide; 902. Y-axis linear guide; 903. Slider; 801. Sliding groove III; 802. Sliding groove IV; 803. Y-grating connecting section; 804. Y-screw nut connecting section; 101. Loading head assembly; 102. Three-way sensor; 103. Sensor flange; 104. Double moving ball I; 105. Double moving ball II; 106. Loading electric cylinder; 107. Loading rod; 1011. Load the ball head; 1012. Load the cue stick; 1013. Load the end cap. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] Example 1: As Figure 1a , Figure 1bAs shown, the triaxial force loading device for testing the flexibility coefficient of an elastic model in this embodiment is a square frame, including a square base assembly 2, a support section assembly 3 and a mounting plate assembly 4 stacked from bottom to top. A vertically intersecting Y-axis sliding frame 8 and X-axis sliding frame 6 are installed on the inner wall of the mounting plate assembly 4. The loading component 1 is a cylindrical rod located on the vertical central axis of the triaxial force loading device. The lower end of the loading component 1 is fixed to the base component 2, and the upper end of the loading component 1 extends from bottom to top out of the mounting plate component 4 at the intersection of the X-axis sliding frame 6 and the Y-axis sliding frame 8. The X-axis drive component 5 drives the X-axis sliding frame 6 to slide along the X-axis via a linear guide rail 9, and the Y-axis drive component 7 drives the Y-axis sliding frame 8 to slide along the Y-axis via a linear guide rail 9, thus causing the upper end of the loading component 1 to move as follows: Figure 2 The cone-shaped cylinder moves to adjust the loading direction of the loading component 1. At the same time, the top of the loading component 1 is driven to extend upward by the drive motor installed on the base component 2 to increase the loading force value.

[0019] Furthermore, such as Figure 3a , Figure 3b As shown, the base assembly 2 includes a square base plate 201 and a locking plate 202 stacked from bottom to top. The lower surface of the base plate 201 is provided with two parallel slider plates 204, which are inserted into corresponding grooves on the ground. The upper surface of the base plate 201 is provided with a grating connecting plate 206 and two parallel upright plates 205. An electric cylinder mounting plate 203 parallel to the base plate 201 is covered on the two parallel upright plates 205. Install a grating on the grating connection plate 206; measure the relative position of the triaxial force loading device through the grating; adjust the relative position of the triaxial force loading device by sliding the slider plate 204 in the groove until the triaxial force loading device moves to the preset position.

[0020] Furthermore, such as Figure 4 As shown, the support segment assembly 3 is a cube, including a lower support segment bottom plate 301 and an upper support segment top plate 302; the left and right sides are support segment side plates I 303, and the front and rear sides are support segment side plates II 304; vertical square tubes 305 are provided along the central symmetrical line of the inner wall of each support segment side plate I 303 and support segment side plate II 304 to increase structural strength. The support section assembly 3 is fixed to the locking plate 202 of the base assembly 2 via the support section base plate 301.

[0021] Furthermore, such as Figure 5a , Figure 5bAs shown, the mounting plate assembly 4 has X-end upright plates 401 on both the left and right sides, and the upper surface of the X-end upright plates 401 on both sides is an upper connecting plate 405; the inner wall of the right X-end upright plate 401 is provided with an X-end horizontal plate 402 and an X-end guide rail mounting plate 403, and the lower surface of the X-end upright plates 401 on both the left and right sides is a lower connecting plate 404; the front and rear sides are Y-end upright plates 406, and the inner wall of the rear Y-end upright plate 406 is provided with a Y-end horizontal plate 407 and a Y-end guide rail mounting plate 408. Mounting plate assembly 4 is fixed to the top plate 302 of the support section assembly 3 via screw holes on the lower surface.

[0022] Furthermore, such as Figure 6 As shown, the X-axis drive assembly 5 and the Y-axis drive assembly 7 have the same structure, both including a motor 505, a reducer 501, a drive coupling 504, and a lead screw and nut pair 502 connected in sequence. The two ends of the lead screw and nut pair 502 are supported by fixed supports 503. The central axes of the motor 505 and the reducer 501 coincide, the central axes of the drive coupling 504 and the lead screw and nut pair 502 coincide, and the two central axes are perpendicular. The motor 505 of the X-axis drive assembly 5 is fixed on the X-end vertical plate 401, and the motor 505 of the Y-axis drive assembly 7 is fixed on the Y-end vertical plate 406.

[0023] Furthermore, such as Figure 7 As shown, the X-axis sliding frame 6 is a rectangular frame. The left inner wall of the X-axis sliding frame 6 is provided with a sliding groove I 601, and the right inner wall is provided with a sliding groove II 602 corresponding to the sliding groove I 601. Both sliding groove I 601 and sliding groove II 602 are arc grooves. The front end face of the X-axis sliding frame 6 is provided with a downwardly extending X-grating connecting section 603, on which the X-axis grating is fixed. The rear end face is provided with a downwardly extending X-screw nut connecting section 604, on which a through hole is provided for connection with the screw nut pair 502 of the X-axis drive assembly 5. like Figure 8 As shown, the Y-axis sliding frame 8 is also a rectangular frame. The front inner wall of the Y-axis sliding frame 8 is provided with a sliding groove Ⅳ802, and the rear inner wall is provided with a sliding groove Ⅲ801 corresponding to the sliding groove Ⅳ802. Both the sliding groove Ⅳ802 and the sliding groove Ⅲ801 are arc grooves. The left end face of the X-axis sliding frame 6 is provided with a downwardly extending Y-axis lead screw nut connecting section 804. The Y-axis lead screw nut connecting section 804 is provided with a through hole that connects to the lead screw nut pair 502 of the Y-axis drive assembly 7. The right end face is provided with a downwardly extending Y-axis grating connecting section 803, and the Y-axis grating is fixed on the Y-axis grating connecting section 803.

[0024] Furthermore, such as Figure 9 As shown, the linear guide 9 includes an X-axis linear guide 901 and a Y-axis linear guide 902; There are two X-axis linear guides 901, which are symmetrical about left and right. One is fixed on the X-end guide mounting plate 403, and the other is fixed on the X-end vertical plate 401. Each X-axis linear guide 901 is embedded with a slider 903. The left and right ends of the X-axis sliding frame 6 slide along the X-axis linear guide 901 through the slider 903. There are also two Y-direction linear guides 902, which are symmetrical front and back. One is fixed on the Y-end vertical plate 406, and the other is fixed on the Y-end guide mounting plate 408. Each Y-direction linear guide 902 is embedded with a slider 903. The front and rear faces of the Y-direction sliding frame 8 slide along the Y-direction linear guide 902 through the slider 903.

[0025] Furthermore, such as Figure 10 As shown, the main body of the loading component 1 is the loading rod 107; The upper section of the loading rod 107, from bottom to top, is fixed with double-moving ball II 105, double-moving ball I 104, a three-way sensor 102, and a loading head assembly 101. The three-way sensor 102 is fixed by a sensor flange 103. Double-moving ball II 105 is inserted into sliding groove IV 802 and sliding groove III 801 of the Y-direction sliding frame 8, and double-moving ball I 104 is inserted into sliding groove I 601 and sliding groove II 602 of the X-direction sliding frame 6. Figure 11 As shown, the loading head assembly 101 includes a loading plug 1013, a loading rod 1012 and a loading ball head 1011 connected sequentially from bottom to top. The loading plug 1013 is fixed to the top surface of the triaxial sensor 102 by a number of screws evenly distributed along the circumference. The lower end of the loading rod 107 is connected to the loading electric cylinder 106, which is fixed on the electric cylinder mounting plate 203 of the base assembly 2. The drive motor is mounted on the locking plate 202 of the base assembly 2 and drives the loading electric cylinder 106.

[0026] The triaxial force loading device for testing the flexibility coefficient of an elastic model in this embodiment can achieve multi-directional force loading within a range of ±15.5° with the Z-axis (vertical) as the central axis. The force loading range is 0~5000N, and the force loading accuracy is 0.1%FS, which can fully meet the requirements for accurate measurement of the flexibility coefficient of the elastic model.

[0027] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. For those skilled in the art, all features disclosed in the present invention, or all steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any way without departing from the principles of the present invention. The present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A triaxial force loading device for testing the compliance coefficient of an elastic model, characterized in that, The triaxial force loading device is a square frame, including a square base assembly (2), a support section assembly (3) and a mounting plate assembly (4) stacked from bottom to top. Vertically intersecting Y-axis sliding frames (8) and X-axis sliding frames (6) are installed on the inner wall of the mounting plate assembly (4). The loading component (1) is a cylindrical rod located on the vertical central axis of the triaxial force loading device. The lower end of the loading component (1) is fixed on the base component (2). The upper end of the loading component (1) extends from the bottom to the top of the mounting plate component (4) at the intersection of the X-direction sliding frame (6) and the Y-direction sliding frame (8). The X-direction drive component (5) drives the X-direction sliding frame (6) to slide along the X direction through the linear guide rail (9). The Y-direction drive component (7) drives the Y-direction sliding frame (8) to slide along the Y direction through the linear guide rail (9), thereby causing the upper end of the loading component (1) to perform conical cylindrical movement to adjust the loading direction of the loading component (1). At the same time, the top of the loading component (1) is driven to extend upward by the drive motor installed on the base component (2) to increase the loading force value.

2. The triaxial force loading device for testing the compliance coefficient of an elastic model according to claim 1, characterized in that, The base assembly (2) includes a square base plate (201) and a locking plate (202) stacked from bottom to top. The lower surface of the base plate (201) is provided with two parallel slider plates (204), which are inserted into corresponding grooves on the ground. The upper surface of the base plate (201) is provided with a grating connecting plate (206) and two parallel upright plates (205). An electric cylinder mounting plate (203) parallel to the base plate (201) is covered on the two parallel upright plates (205). Install a grating on the grating connection plate (206); measure the relative position of the triaxial force loading device through the grating; adjust the relative position of the triaxial force loading device by sliding the slider plate (204) in the groove until the triaxial force loading device moves to the preset position.

3. The triaxial force loading device for testing the compliance coefficient of an elastic model according to claim 2, characterized in that, The support segment assembly (3) is a cube, including a bottom support segment plate (301) at the bottom and a top support segment plate (302) at the top; the left and right sides are support segment side plates I (303), and the front and rear sides are support segment side plates II (304); vertical square tubes (305) are provided along the central symmetry line of the inner wall of each support segment side plate I (303) and support segment side plate II (304) to increase the structural strength; The support section assembly (3) is fixed to the locking plate (202) of the base assembly (2) via the support section base plate (301).

4. The triaxial force loading device for testing the compliance coefficient of an elastic model according to claim 3, characterized in that, The mounting plate assembly (4) has X-end upright plates (401) on both the left and right sides, and the upper surface of the X-end upright plates (401) on both sides is an upper connecting plate (405); the inner wall of the X-end upright plate (401) on the right side is provided with an X-end horizontal plate (402) and an X-end guide rail mounting plate (403), and the lower surface of the X-end upright plates (401) on both the left and right sides is a lower connecting plate (404); the front and rear sides are Y-end upright plates (406), and the inner wall of the rear Y-end upright plate (406) is provided with a Y-end horizontal plate (407) and a Y-end guide rail mounting plate (408). The mounting plate assembly (4) is fixed to the top plate (302) of the support section assembly (3) through the screw holes on the lower surface.

5. The triaxial force loading device for testing the compliance coefficient of an elastic model according to claim 4, characterized in that, The X-axis drive assembly (5) and the Y-axis drive assembly (7) have the same structure, both including a motor (505), a reducer (501), a drive coupling (504), and a lead screw and nut pair (502) connected in sequence. The two ends of the lead screw and nut pair (502) are supported by fixed supports (503). The central axes of the motor (505) and the reducer (501) coincide, the central axes of the drive coupling (504) and the lead screw and nut pair (502) coincide, and the two central axes are perpendicular. The motor (505) of the X-direction drive assembly (5) is fixed on the X-end plate (401), and the motor (505) of the Y-direction drive assembly (7) is fixed on the Y-end plate (406).

6. The triaxial force loading device for testing the compliance coefficient of an elastic model according to claim 5, characterized in that, The X-axis sliding frame (6) is a rectangular frame. The left inner wall of the X-axis sliding frame (6) is provided with a sliding groove I (601), and the right inner wall is provided with a sliding groove II (602) corresponding to the sliding groove I (601). Both the sliding groove I (601) and the sliding groove II (602) are arc grooves. The front end of the X-axis sliding frame (6) is provided with a downwardly extending X-grating connecting section (603), on which the X-axis grating is fixed. The rear end is provided with a downwardly extending X-screw nut connecting section (604), on which a through hole is provided for connection with the screw nut pair (502) of the X-axis drive assembly (5). The Y-axis sliding frame (8) is also a rectangular frame. The front inner wall of the Y-axis sliding frame (8) is provided with a sliding groove Ⅳ (802), and the rear inner wall is provided with a sliding groove Ⅲ (801) corresponding to the sliding groove Ⅳ (802). Both the sliding groove Ⅳ (802) and the sliding groove Ⅲ (801) are arc grooves. The left end face of the X-axis sliding frame (6) is provided with a downwardly extending Y screw nut connecting section (804). The Y screw nut connecting section (804) is provided with a through hole connected to the screw nut pair (502) of the Y-axis drive assembly (7). The right end face is provided with a downwardly extending Y grating connecting section (803). The Y-axis grating is fixed on the Y grating connecting section (803).

7. The triaxial force loading device for testing the compliance coefficient of an elastic model according to claim 6, characterized in that, The linear guide (9) includes an X-direction linear guide (901) and a Y-direction linear guide (902); There are two X-axis linear guides (901), which are symmetrical about left and right. One is fixed on the X-end guide mounting plate (403), and the other is fixed on the X-end vertical plate (401). Each X-axis linear guide (901) has a slider (903) embedded in it. The left and right ends of the X-axis sliding frame (6) slide along the X-axis linear guide (901) through the slider (903). There are also two Y-direction linear guides (902). The two Y-direction linear guides (902) are symmetrical front and back. One is fixed on the Y-end vertical plate (406), and the other is fixed on the Y-end guide mounting plate (408). Each Y-direction linear guide (902) has a slider (903) embedded in it. The front end and rear end of the Y-direction sliding frame (8) slide along the Y-direction linear guide (902) through the slider (903).

8. The triaxial force loading device for testing the compliance coefficient of an elastic model according to claim 7, characterized in that, The main body of the loading component (1) is the loading rod (107). The upper section of the loading rod (107) is fixed from bottom to top with double moving ball II (105), double moving ball I (104), triaxial sensor (102) and loading head assembly (101). The triaxial sensor (102) is fixed by the sensor flange (103). Double moving ball II (105) is inserted into the sliding groove IV (802) and sliding groove III (801) of the Y-direction sliding frame (8). Double moving ball I (104) is inserted into the sliding groove I (601) and sliding groove II (602) of the X-direction sliding frame (6). The loading head assembly (101) includes a loading plug (1013), a loading ball rod (1012) and a loading ball head (1011) connected from bottom to top. The loading plug (1013) is fixed to the top surface of the triaxial sensor (102) by a number of screws evenly distributed along the circumference. The lower end of the loading rod (107) is connected to the loading electric cylinder (106), the loading electric cylinder (106) is fixed on the electric cylinder mounting plate (203) of the base assembly (2), and the drive motor is mounted on the locking plate (202) of the base assembly (2) to drive the loading electric cylinder (106).

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