Three-axis stiffness test fixture for single vibration isolator

Abstract

The present invention provides a three-dimensional stiffness test fixture for a single vibration isolator, comprising a base plate, a support frame, a load, a threaded rod, a first rod end joint bearing, and a second rod end joint bearing, wherein the support frame is mounted on the top of the base plate; the vibration isolator is bolted to the base plate; the load is coaxially arranged with the vibration isolator, one end of the load is detachably connected to the vibration isolator, and the other end of the load passes through the support frame; the bearing end of the first rod end joint bearing is sleeved on the threaded rod, and the rod end of the first rod end joint bearing is threadedly connected to the load; the bearing end of the second rod end joint bearing is sleeved on the threaded rod, and the rod end of the second rod end joint bearing is threadedly connected to the support frame; two first nuts are threadedly connected to the threaded rod, and the two first nuts are arranged at the upper and lower ends of the bearing end of the first rod end joint bearing; two second nuts are threadedly connected to the threaded rod, and the two second nuts are arranged at the upper and lower ends of the bearing end of the second rod end joint bearing. The present application avoids two-way interference during testing of single vibration isolators.

Description

Technical Field

[0001] The invention relates to the field of vibration isolator stiffness testing equipment, in particular to a three-dimensional stiffness testing tool for a single vibration isolator. Background Art

[0002] The vibration isolators used in the military field are generally metal type vibration isolators. This is because metal vibration isolators have the characteristics of high reliability and long life.

[0003] When the commonly used vibration isolator three-dimensional stiffness test fixture is used, four identical vibration isolators are evenly distributed at the bottom of the load, and the stiffness of the vibration isolator is estimated by calculating the average value of the attenuation, which causes a certain error between the actual stiffness of the vibration isolator and the measured stiffness;

[0004] The three-dimensional stiffness test of a single vibration isolator needs to consider the risk of bidirectional motion interference during the vertical stiffness test and the horizontal stiffness test. During the vertical stiffness test, if there is no horizontal restriction, the vibration isolator will have horizontal movement or movement trend; during the horizontal stiffness test, if there is no vertical restriction, the vibration isolator will have vertical movement or movement trend; these movements or movement trends will affect the accuracy of the vibration isolator stiffness test.

[0005] Currently, there is no three-dimensional stiffness test fixture for single-body vibration isolators that can avoid bidirectional motion interference. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a three-dimensional stiffness test tool for a single vibration isolator, which realizes the three-dimensional stiffness test of the single vibration isolator, avoids the interference of two-way motion, and the stiffness test result of the single vibration isolator is more accurate. The technical solution adopted by the present invention is:

[0007] A three-dimensional stiffness test tool for a single vibration isolator, comprising:

[0008] A bottom plate, the bottom plate is used to connect a stiffness testing device;

[0009] A support frame, the support frame is mounted on the top of the base plate;

[0010] A vibration isolator, the vibration isolator is connected to the bottom plate by bolts and extends in a vertical direction;

[0011] A load, wherein the load is coaxially arranged with the vibration isolator, one end of the load is detachably connected to the vibration isolator, and the other end of the load is capable of passing through the support frame; and

[0012] The anti-interference assembly comprises a threaded rod, a first rod end joint bearing, and a second rod end joint bearing; the threaded rod extends in a vertical direction; the bearing end of the first rod end joint bearing is sleeved on the threaded rod, and the rod end of the first rod end joint bearing is threadedly connected to a load; the bearing end of the second rod end joint bearing is sleeved on the threaded rod, and the rod end of the second rod end joint bearing is threadedly connected to a support frame, and the first rod end joint bearing and the second rod end joint bearing both provide horizontal degrees of freedom for the threaded rod;

[0013] The threaded rod is threadedly connected with two first nuts, and the two first nuts are arranged at upper and lower ends of the bearing end of the first rod end joint bearing;

[0014] The threaded rod is threadedly connected with two second nuts, and the two second nuts are arranged at upper and lower ends of the bearing end of the second rod end joint bearing;

[0015] The first rod end joint bearing and the second rod end joint bearing extend in a horizontal direction respectively.

[0016] Further, the load includes a lower mounting plate, a free load, an upper mounting plate and an optical axis; the lower mounting plate is connected to the vibration isolator by a first bolt, the upper mounting plate is arranged parallel to the upper side of the lower mounting plate, one end of the optical axis is connected to the upper mounting plate, the other end of the optical axis passes through the support frame and can move in a vertical direction, and the optical axis can be fixedly connected to the support frame by a positioning pin;

[0017] The free load is detachably arranged between the lower mounting plate and the upper mounting plate; the free load can be connected to the lower mounting plate via a second bolt, and the free load can be connected to the upper mounting plate via a third bolt;

[0018] The upper mounting plate can be connected to the lower mounting plate by a third bolt;

[0019] The rod end of the first rod end joint bearing is threadedly connected to the lower mounting plate.

[0020] Furthermore, a threaded through hole is provided on the lower mounting plate, and the axis of the threaded through hole coincides with the axis of the vibration isolator, for installing a first bolt.

[0021] Further, the free load includes at least one mass block, the mass block can be connected to the lower mounting plate through a second bolt, and the mass block can be connected to the upper mounting plate through a third bolt;

[0022] When the number of the mass blocks is two or more, the two or more mass blocks are stacked and arranged, and two adjacent mass blocks are connected by second bolts respectively.

[0023] Furthermore, the mass block is provided with a hidden space, two countersunk holes and two threaded holes;

[0024] The axis of the hidden space coincides with the axis of the vibration isolator, and is used to hide the first bolt;

[0025] The countersunk hole is opened from top to bottom;

[0026] The threaded hole is opened from top to bottom, and the diameter of the threaded hole is equal to the small diameter of the countersunk hole;

[0027] When the number of mass blocks n≥2, when the second bolt passes through the countersunk hole on the nth mass block and is threadedly connected to the threaded hole on the (n-1)th mass block, two adjacent mass blocks are fixedly connected.

[0028] Furthermore, the lower mounting plate is provided with two lower threaded holes, and when the second bolt passes through the countersunk holes and is threadedly connected to the lower threaded holes, a fixed connection between the mass block and the lower mounting plate is achieved.

[0029] Furthermore, the upper mounting plate is provided with two upper positioning holes, and the two upper positioning holes correspond to the two threaded holes respectively. When the third bolt passes through the upper positioning holes and is threadedly connected with the threaded holes, the upper mounting plate is fixedly connected to the mass block.

[0030] Furthermore, a shaft sleeve is provided on the support frame, and the optical axis passes through the shaft sleeve;

[0031] The shaft sleeve and the optical axis are respectively provided with corresponding pin holes, and positioning pins can be inserted into the pin holes to fix the position of the optical axis.

[0032] Furthermore, the support frame includes two side support plates and an upper support plate, the upper support plate is arranged parallel to the upper side of the base plate, and the two side support plates are located at both ends of the upper support plate; one end of any one of the side support plates is connected to the base plate, and the other end of any one of the side support plates is connected to the upper support plate, and the optical axis passes through the upper support plate.

[0033] Advantages of the present invention:

[0034] 1. This application uses a load-through-support method to limit the horizontal movement of the isolator during the vertical stiffness test. After the anti-interference component is installed, the vertical movement of the isolator during the horizontal stiffness test is limited, thereby avoiding the risk of two-way motion interference, improving the stability during the single-degree-of-freedom stiffness test, and improving the test accuracy of the single-unit isolator, and the test results are more accurate;

[0035] 2. Anti-interference components are not required during vertical stiffness testing. At this time, you only need to rotate the first nut and the second nut to separate the threaded rod and the first rod end joint bearing. There is no need to remove the entire anti-interference component, which makes the operation faster.

[0036] 3. The first rod end joint bearing and the second rod end joint bearing can provide a certain degree of freedom for the threaded rod in the horizontal direction, meeting the displacement requirements during the horizontal stiffness test;

[0037] 4. The load is composed of an initial load and at least one mass block. The load weight can be changed according to different needs. The connection method between mass blocks and between mass blocks and loads is universal, which is convenient for processing and connection and fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural diagram of the present invention.

[0039] Figure 2 It is the front view of the present invention.

[0040] Figure 3 for Figure 2 Cross-sectional view along line DD.

[0041] Figure 4 for Figure 2 Cross-sectional view along line EE.

[0042] Figure 5 It is an exploded diagram of the load of the present invention.

[0043] Figure 6 It is a top view of the mass block in the present invention.

[0044] Figure 7 for Figure 6 Sectional view along line AA.

[0045] Figure 8 for Figure 6 Sectional view along line BB.

[0046] In the figure: 1-base plate, 2-support frame, 3-vibration isolator, 4-threaded rod, 5-first rod end joint bearing, 6-first nut, 7-second rod end joint bearing, 8-second nut, 9-lower mounting plate, 10-mass block, 11-upper mounting plate, 12-optical axis, 13-first bolt, 14-second bolt, 15-third bolt, 16-sleeve, 17, positioning pin, 201-side support plate, 202-upper support plate, 2011-reinforcement part, 901-lower threaded hole, 1001-hidden space, 1002-countersunk hole, 1003-threaded hole. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] Please see attached Figure 1-4 The present invention provides a three-dimensional stiffness test tool for a single vibration isolator, comprising a base plate 1, a support frame 2, a vibration isolator 3, a load and an anti-interference component; the base plate 1 is used to connect a stiffness test device, and the stiffness test device realizes excitation input by vertically or horizontally exciting the base plate 1; the support frame 2 is mounted on the top of the base plate 1, and the support frame 2 is fixedly connected to the base plate 1 to provide a vertical limiting carrier and a horizontal limiting carrier for the load; the vibration isolator 3 is bolted to the base plate 1, and the vibration isolator 3 extends in the vertical direction; the vertical direction of this application is the vertical direction in the stiffness test of the vibration isolator 3; the load and the vibration isolator 3 are coaxially arranged, and the coaxial arrangement makes the vibration isolator 3 uniform Uniform force is applied to avoid the influence of force deviation on the test results; one end of the load is detachably connected to the vibration isolator 3, and the other end of the load can penetrate the support frame 2. When the vertical stiffness test of the vibration isolator 3 is performed, under the limiting effect of one end of the load penetrating the support frame 2, the vibration isolator 3 will not generate horizontal movement, avoiding the influence of horizontal movement interference on the vertical stiffness test; the anti-interference component is detachably connected between the support frame 2 and the load, and is used to fix the distance between the load and the support frame 2 in the vertical direction, so as to limit the vertical movement of the vibration isolator 3 during the horizontal stiffness test, avoiding the influence of vertical movement interference on the horizontal stiffness test.

[0049] In the present application, the anti-interference component includes a threaded rod 4, a first rod-end joint bearing 5, and a second rod-end joint bearing 7; the threaded rod 4 extends in the vertical direction; the bearing end of the first rod-end joint bearing 5 is sleeved on the threaded rod 4, and the rod end of the first rod-end joint bearing 5 is threadedly connected to the load; the bearing end of the second rod-end joint bearing 7 is sleeved on the threaded rod 4, and the rod end of the second rod-end joint bearing 7 is threadedly connected to the support frame 2, and the first rod-end joint bearing 5 and the second rod-end joint bearing 7 both provide horizontal degrees of freedom for the threaded rod 4; two first nuts 6 are threadedly connected to the threaded rod 4, and the two first nuts 6 are arranged at the upper and lower ends of the bearing end of the first rod-end joint bearing 5; two second nuts 8 are threadedly connected to the threaded rod 4, and the two second nuts 8 are arranged at the upper and lower ends of the bearing end of the second rod-end joint bearing 7.

[0050] Specifically, the aperture of the bearing end of the first rod end joint bearing 5 and the aperture of the bearing end of the second rod end joint bearing 7 are both larger than the diameter of the threaded rod 4, meeting the displacement requirement during the horizontal stiffness test but not affecting the displacement limit in the vertical direction.

[0051] The first rod-end joint bearing 5 and the second rod-end joint bearing 7 extend in the horizontal direction respectively; the two first nuts 6 fix the relative position of the threaded rod 4 and the first rod-end joint bearing 5, and the two second nuts 8 fix the relative position of the threaded rod 4 and the second rod-end joint bearing 7, thereby fixing the relative position of the support frame 2 and the load in the vertical direction. When testing the vertical stiffness, it is only necessary to unscrew the first nut 6 located on the lower side of the first rod-end joint bearing 5, and then rotate the first nut 6 on the upper side of the first rod-end joint bearing 5 and the second nut 8 on the lower side of the second rod-end joint bearing 7 towards each other, and then pull the threaded rod 4 upward out of the bearing end of the first rod-end joint bearing 5 to release the restriction of the load and the support frame 2 in the vertical direction.

[0052] Please see attached Figure 5 In the present application, the load includes a lower mounting plate 9, a free load, an upper mounting plate 11 and an optical axis 12; the lower mounting plate 9 is connected to the vibration isolator 3 by a first bolt 13, the upper mounting plate 11 is arranged parallel to the upper side of the lower mounting plate 9, one end of the optical axis 12 is connected to the upper mounting plate 11, the other end of the optical axis 12 passes through the support frame 2 and can move in the vertical direction, and the optical axis 12 can be fixedly connected to the support frame 2 by a locating pin 17; the free load is detachably arranged between the lower mounting plate 9 and the upper mounting plate 11; the free load can be connected to the lower mounting plate 9 by a second bolt 14, and the free load can be connected to the upper mounting plate 11 by a third bolt 15; the upper mounting plate 11 can be connected to the lower mounting plate 9 by a third bolt 15; the rod end of the first rod end joint bearing 5 is threadedly connected to the lower mounting plate 9.

[0053] In the present application, the first bolt 13, the second bolt 14 and the third bolt 15 have the same specifications, so the parts have good versatility.

[0054] When doing the vertical stiffness test, the initial load is the weight of the lower mounting plate 9, the upper mounting plate 11 and the optical axis 12, and the superimposed weight is the weight of the free load. Two velocity-displacement sensors are respectively arranged on the bottom plate 1 and the upper mounting plate 11. The attenuation effect of the vibration isolator 3 is calculated through the data transmitted by the two velocity-displacement sensors, and then the vertical stiffness of the vibration isolator 3 is tested;

[0055] When testing the horizontal stiffness, the initial load is the weight of the lower mounting plate 9, and the superimposed weight is the weight of the free load. Two velocity-displacement sensors are respectively arranged on the bottom plate 1 and the lower mounting plate 9. The attenuation effect of the vibration isolator 3 is calculated through the data transmitted by the two velocity-displacement sensors, and then the horizontal stiffness of the vibration isolator 3 is tested;

[0056] In some embodiments, in order to further improve the accuracy of the test, a sensor may be added to the surface of the vibration isolator 3 .

[0057] In some embodiments, the lower mounting plate 9 is provided with a lower mounting plate threaded hole threadedly connected to the rod end of the first rod end joint bearing 5, and the support frame 2 is provided with an upper mounting plate threaded hole threadedly connected to the rod end of the second rod end joint bearing 7.

[0058] In order to achieve fixed connection between the lower mounting plate 9 and the vibration isolator 3 and ensure that their axes coincide, a threaded through hole is provided on the lower mounting plate 9 , the axis of which coincides with the axis of the vibration isolator 3 , for installing the first bolt 13 .

[0059] Please see attached Figure 6-8 In order to be able to adjust the weight of the load and make the load weight increase or decrease in a step-by-step manner, the free load includes at least one mass block 10, and the mass block 10 can be connected to the lower mounting plate 9 through a second bolt 14, and the mass block 10 can be connected to the upper mounting plate 11 through a third bolt 15; when the number of mass blocks 10 is two or more, two or more mass blocks 10 are stacked and arranged, and two adjacent mass blocks 10 are connected by a second bolt 14 respectively.

[0060] In some embodiments, the weight of the mass block 10 is equal to the sum of the weights of the upper mounting plate 9 and the optical axis 12. Therefore, in the vertical stiffness test and the horizontal stiffness test under the same weight, the number of mass blocks 10 used in the horizontal stiffness test is one more than the number of mass blocks 10 used in the vertical stiffness test, which facilitates the calculation of the load weight and reduces the difficulty of the test.

[0061] In the present application, the mass block 10 is provided with a hidden space 1001, two countersunk holes 1002 and two threaded holes 1003; the axis of the hidden space 1001 coincides with the axis of the vibration isolator 3, and is used to hide the first bolt 13; the countersunk hole 1002 is opened from top to bottom; the threaded hole 1003 is opened from top to bottom, and the aperture of the threaded hole 1003 is equal to the small aperture of the countersunk hole 1002;

[0062] When the number of mass blocks 10 n≥2, when the second bolt 14 passes through the countersunk hole 1002 on the nth mass block 10 and is threadedly connected with the threaded hole 1003 on the n-1th mass block 10, the two adjacent mass blocks 10 are fixedly connected; the countersunk hole 1002 can hide the head of the second bolt 14, so that the end faces of the two adjacent mass blocks 10 are completely fitted, thereby improving the connection stability.

[0063] In some embodiments, the threaded hole 1003 can be processed into a through hole or a blind hole.

[0064] In other embodiments, the edges of the upper and lower surfaces of the mass block 10 are chamfered to make the edges of the mass block 10 smooth, thereby improving the operational safety when taking and placing the mass block and avoiding injuries caused by burrs.

[0065] In other embodiments, the mass block 10 is disc-shaped, and its axis coincides with the axis of the vibration isolator 3. By setting a specific shape of the mass block 10, the weight of the mass block 10 acts on the center of the vibration isolator 3, preventing the eccentric effect of the load on the vibration isolator 3 from causing errors in the stiffness test results.

[0066] In the present application, two lower threaded holes 901 are provided on the lower mounting plate 9. When the second bolt 14 passes through the countersunk hole 1002 and is threadedly connected to the lower threaded hole 901, the mass block 10 is fixedly connected to the lower mounting plate 9.

[0067] In the present application, two upper positioning holes 1101 are provided on the upper mounting plate 11, and the two upper positioning holes 1101 correspond to the two threaded holes 1003 respectively. When the third bolt 15 passes through the upper positioning hole 1101 and is threadedly connected with the threaded hole 1003, the upper mounting plate 11 is fixedly connected to the mass block 10.

[0068] In some embodiments, the line connecting the axes of the two countersunk holes 1002 is the first straight line, the line connecting the axes of the two threaded holes 1003 is the second straight line, the first straight line and the second straight line are perpendicular to each other, and the hidden space 1001 is located at the intersection of the first straight line and the second straight line; this allows the first connecting line and the second connecting line to alternate layer by layer and be symmetrical relative to the hidden space 1001, which not only disperses the connection points, but also ensures the stability of the connection and saves the number of holes to be punched.

[0069] Please see attached Figure 1 and 3 In order to further improve the smoothness of the movement of the optical axis 12 in the vertical direction, a sleeve 16 is provided on the support frame 2, and the optical axis 12 passes through the sleeve 16;

[0070] In order to facilitate the arrangement of the positioning pin 17 , corresponding pin holes are respectively provided on the shaft sleeve 16 and the optical axis 12 , and the positioning pin 17 can be inserted into the pin hole to fix the position of the optical axis 12 .

[0071] As an embodiment of the present application, the positioning pin 17 may also be replaced with other commonly used positioning parts such as bolts.

[0072] Please see attached Figure 1 In the present application, the support frame 2 includes two side support plates 201 and an upper support plate 202, the upper support plate 202 is arranged in parallel on the upper side of the base plate 1, and the two side support plates 201 are located at both ends of the upper support plate 202; one end of any one of the side support plates 201 is connected to the base plate 1, and the other end of any one of the side support plates 201 is connected to the upper support plate 202, and the optical axis 12 runs through the upper support plate 202.

[0073] Specifically, the shaft sleeve 16 is threadedly connected to the upper support plate 202 .

[0074] In order to improve the supporting strength of the support frame 2 , a reinforcing portion 2011 is provided on the side of the side support plate 201 away from the load.

[0075] In one embodiment, lower positioning steps are respectively provided on the left and right sides of the top surface of the bottom plate 1, and the side support plate 201 abuts against the side walls of the lower positioning steps, which facilitates the rapid positioning of the bottom plate 1 and the side support plate 201 and improves the structural stability of the bottom plate 1 and the support frame 2.

[0076] In another embodiment, upper positioning steps are respectively provided on the left and right sides of the bottom of the upper support plate 202, and the top of the side support plate 201 abuts against the side wall of the upper positioning step, so as to facilitate the rapid positioning of the side support plate 201 and the upper support plate 202 and improve the structural stability of the support frame 2.

[0077] In other embodiments, the upper mounting plate 11 and the lower mounting plate 9 have the same structure, and the lower mounting plate 9 is provided with a notch for accommodating the first rod end joint bearing 5 .

[0078] The process of using this application is as follows:

[0079] Vertical stiffness test: the lower mounting plate 9 is fixedly connected to the vibration isolator 3; the positioning pin 17 is removed to slide the optical axis 12 and the upper mounting plate 11 downward, and the upper mounting plate 11 and the lower mounting plate 9 are connected, and the anti-interference component is removed so that it does not participate in the vertical stiffness test process of the vibration isolator 3. The lower mounting plate 9 can vibrate in the vertical direction relative to the support frame 2, and the relative sliding of the optical axis 12 and the shaft sleeve 16 prevents the load and the vibration isolator 3 from vibrating in the horizontal direction; the lower mounting plate 9, the upper mounting plate 11 and the optical axis 12 constitute the initial load for the vertical stiffness test of the vibration isolator 3; velocity-displacement sensors are placed on the bottom plate 1 and the upper mounting plate 11 respectively, and the test equipment is connected. The test equipment excites the bottom plate 1 in the vertical direction, and transmits information to the test equipment through two velocity-displacement sensors to complete the initial vertical stiffness test; then, according to the test needs, the number of mass blocks 10 is gradually increased between the lower mounting plate 9 and the upper mounting plate 11, and the test process is repeated.

[0080] Horizontal stiffness test: lift the upper mounting plate 9 and the optical axis 12, and fix the positions of the upper mounting plate 9 and the optical axis 12 with the positioning pin 17 so that they do not participate in the horizontal stiffness test process of the vibration isolator; install the anti-interference component to fix the positions of the lower mounting plate 9 and the support frame 2 in the vertical direction to each other to avoid vertical vibration of the vibration isolator 3; the lower mounting plate 9 is the initial load for the vertical stiffness test of the vibration isolator 3; velocity-displacement sensors are placed on the base plate 1 and the lower mounting plate 9 respectively, and the test side backs are connected. The test equipment gives the base plate 1 the first horizontal excitation, and transmits information to the test equipment through two velocity-displacement sensors to complete the initial horizontal stiffness test; since the bearing ends of the first rod end joint bearing 5 and the second rod end joint bearing 7 both provide horizontal degrees of freedom for the threaded rod 4, the threaded rod 4 does not limit the horizontal vibration of the lower mounting plate 9; then, according to the test needs, gradually increase the number of mass blocks 10 to the lower mounting plate 9, and repeat the horizontal stiffness test;

[0081] The entire test fixture is rotated horizontally by 90°, and the horizontal excitation direction of the test equipment remains unchanged, so that the stiffness test in the second horizontal direction can be realized, thereby completing the complete three-way stiffness test process of the vibration isolator 3.

[0082] In summary, the present application realizes the three-dimensional stiffness test function of the single vibration isolator, avoids the mutual interference between the vertical test and the horizontal test, and improves the accuracy of the stiffness test of the single vibration isolator.

[0083] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A three-dimensional stiffness test tool for a single vibration isolator, characterized in that: include A bottom plate (1), the bottom plate (1) being used to connect a stiffness testing device; A support frame (2), the support frame (2) being mounted on the top of the base plate (1); A vibration isolator (3), wherein the vibration isolator (3) is bolted to the base plate (1), and the vibration isolator (3) extends in a vertical direction; a load, the load being coaxially arranged with the vibration isolator (3), one end of the load being detachably connected to the vibration isolator (3), and the other end of the load being capable of passing through the support frame (2); and An anti-interference component comprises a threaded rod (4), a first rod end joint bearing (5), and a second rod end joint bearing (7); the threaded rod (4) extends in a vertical direction; the bearing end of the first rod end joint bearing (5) is sleeved on the threaded rod (4), and the rod end of the first rod end joint bearing (5) is threadedly connected to a load; the bearing end of the second rod end joint bearing (7) is sleeved on the threaded rod (4), and the rod end of the second rod end joint bearing (7) is threadedly connected to a support frame (2); the first rod end joint bearing (5) and the second rod end joint bearing (7) both provide horizontal degrees of freedom for the threaded rod (4); two first nuts (6) are threadedly connected to the threaded rod (4), and the two first nuts (6) are arranged at the upper and lower ends of the bearing end of the first rod end joint bearing (5); two second nuts (8) are threadedly connected to the threaded rod (4), and the two second nuts (8) are arranged at the upper and lower ends of the bearing end of the second rod end joint bearing (7); the first rod end joint bearing (5) and the second rod end joint bearing (7) extend in a horizontal direction respectively; The load comprises a lower mounting plate (9), a free load, an upper mounting plate (11) and an optical axis (12); the lower mounting plate (9) is connected to the vibration isolator (3) via a first bolt (13); the upper mounting plate (11) is arranged parallel to the upper side of the lower mounting plate (9); one end of the optical axis (12) is connected to the upper mounting plate (11); the other end of the optical axis (12) passes through the support frame (2) and can move in a vertical direction; the optical axis (12) can be fixedly connected to the support frame (2) via a positioning pin (17); The free load is detachably arranged between the lower mounting plate (9) and the upper mounting plate (11); the free load can be connected to the lower mounting plate (9) via a second bolt (14); the free load can be connected to the upper mounting plate (11) via a third bolt (15); and the upper mounting plate (11) can be connected to the lower mounting plate (9) via the third bolt (15); The rod end of the first rod end joint bearing (5) is threadedly connected to the lower mounting plate (9); The support frame (2) is provided with a shaft sleeve (16), the optical axis (12) passes through the shaft sleeve (16), and the shaft sleeve (16) and the optical axis (12) are respectively provided with corresponding pin holes, and positioning pins (17) can be inserted into the pin holes to fix the position of the optical axis (12).

2. The three-dimensional stiffness test tool for a single vibration isolator according to claim 1, characterized in that: The lower mounting plate (9) is provided with a threaded through hole, the axis of which coincides with the axis of the vibration isolator (3), and is used for mounting a first bolt (13).

3. The three-dimensional stiffness test tool for a single vibration isolator according to claim 2, characterized in that: The free load comprises at least one mass block (10), wherein the mass block (10) can be connected to the lower mounting plate (9) via a second bolt (14), and the mass block (10) can be connected to the upper mounting plate (11) via a third bolt (15); When the number of mass blocks (10) is two or more, the two or more mass blocks (10) are stacked and arranged, and two adjacent mass blocks (10) are connected via second bolts (14) respectively.

4. The three-dimensional stiffness test tool for a single vibration isolator according to claim 3 is characterized in that: The mass block (10) is provided with a hidden space (1001), two countersunk holes (1002) and two threaded holes (1003); The axis of the hidden space (1001) coincides with the axis of the vibration isolator (3), and is used to hide the first bolt (13); The countersunk hole (1002) is opened from top to bottom; The threaded hole (1003) is opened from top to bottom, and the diameter of the threaded hole (1003) is equal to the small diameter of the countersunk hole (1002); When the number of mass blocks (10) n≥2, when the second bolt (14) penetrates the countersunk hole (1002) on the nth mass block (10) and is threadedly connected to the threaded hole (1003) on the n-1th mass block (10), two adjacent mass blocks (10) are fixedly connected.

5. The three-dimensional stiffness testing tool for a single vibration isolator according to claim 3 is characterized in that: The lower mounting plate (9) is provided with two lower threaded holes (901), and when the second bolt (14) passes through the countersunk hole (1002) and is threadedly connected to the lower threaded hole (901), the mass block (10) and the lower mounting plate (9) are fixedly connected.

6. The three-dimensional stiffness testing tool for a single vibration isolator according to claim 3 is characterized in that: The upper mounting plate (11) is provided with two upper positioning holes (1101), the two upper positioning holes (1101) respectively corresponding to the two threaded holes (1003), and when the third bolt (15) passes through the upper positioning holes (1101) and is threadedly connected to the threaded holes (1003), the upper mounting plate (11) is fixedly connected to the mass block (10).

7. The three-dimensional stiffness test tool for a single vibration isolator according to claim 4, characterized in that: The line connecting the axes of the two countersunk holes (1002) is a first straight line, the line connecting the axes of the two threaded holes (1003) is a second straight line, the first straight line and the second straight line are perpendicular to each other, and the hidden space (1001) is located at the intersection of the first straight line and the second straight line.

8. The three-dimensional stiffness test tool for a single vibration isolator according to claim 1, characterized in that: The support frame (2) comprises two side support plates (201) and an upper support plate (202); the upper support plate (202) is arranged in parallel on the upper side of the bottom plate (1); the two side support plates (201) are located at both ends of the upper support plate (202); one end of any one of the side support plates (201) is connected to the bottom plate (1), and the other end of any one of the side support plates (201) is connected to the upper support plate (202); and the optical axis (12) passes through the upper support plate (202).

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