A segmented torsional stiffness test device based on adjustable gap

Abstract

This invention discloses a segmented torsional stiffness testing device based on adjustable clearance, belonging to the field of nonlinear mechanical clearance testing technology. The device includes a test bench base, bearings, a rotating shaft, an elastic beam, a V-shaped limiting block, an XY-axis displacement platform, and an R-axis manual rotary slide. One end of the elastic beam is fixed to the rotating shaft, and the free end is inserted into the notch of the V-shaped limiting block fixed on the rotary slide. The rotary slide is mounted on the displacement platform. By adjusting the displacement platform, the relative planar position of the V-shaped limiting block and the rotating shaft can be steplessly changed, thereby adjusting the total clearance and the ratio of the clearances on both sides. By adjusting the rotary slide, the orientation of the V-shaped notch can be steplessly changed, thereby setting a new equilibrium position. By changing the extension length of the elastic beam, the equivalent contact stiffness can be steplessly adjusted. This invention achieves continuous, precise, and stepless adjustment of the torsional clearance, equilibrium position, ratio of the clearances on both sides, and contact stiffness, solving the problems of discontinuous adjustment and the need for disassembly and replacement of parts required by traditional methods.

Description

Technical Field

[0001] This invention belongs to the field of gap nonlinear correlation test technology in mechanical research, specifically relating to a segmented torsional stiffness test device based on a steplessly adjustable gap. Background Technology

[0002] Currently, the industry generally adopts the method of designing detachable blocks-feeler gauges (limiting plates) or pin-shoulder hole diameter differences to adjust the gap in mechanical tests. Specifically, it is necessary to remove and replace feeler gauges or pins of different sizes to adjust the gap. At the same time, its contact stiffness is determined by the spring plate and other structures, and it is also necessary to replace the corresponding elastic structure to adjust the contact stiffness. In detail, the above methods have the following shortcomings: (1) The gap adjustment is determined by feeler gauges or pins, which can only achieve a specific gap value and cannot be continuously adjusted, i.e., stepless adjustment. This results in a serious limitation on the adjustment range and accuracy. For example, in CN 104897355 A, the process of adjusting the gap needs to be achieved by removing and replacing the limiting plate. (2) The contact stiffness on both sides of the gap has only a fixed value. Adjustment requires replacing structural components such as spring plates, and it is impossible to achieve continuous adjustment of the contact stiffness. (3) The gap balance position is fixed and cannot be adjusted according to the test requirements. Summary of the Invention

[0003] The purpose of this invention is to provide a segmented torsional gap testing device with stepless adjustable gap, which can realize stepless adjustment of gap amount and contact stiffness.

[0004] The technical solution of the present invention:

[0005] A piecewise linear torsional stiffness testing device based on adjustable gap, comprising:

[0006] Test bench base, bearings, rotating shaft, elastic beam, V-shaped limit block, R-axis manual rotary slide, XY two-axis displacement platform.

[0007] The test bench base serves as the foundation for the entire test bench construction. A bearing is installed on one end of the test bench surface along the X-axis baseline, and the other end is connected to the XY two-axis displacement platform.

[0008] The bearing is mounted on the base to mount the rotating shaft and, during the test, withstands certain lateral and axial forces and moments.

[0009] The rotating shaft, installed in the bearing, provides the rotational motion degree of freedom with gap nonlinearity studied in this test bench. The rotating shaft includes an interface for connecting an elastic beam, ensuring that the elastic beam is stably fixed on the rotating shaft during the test.

[0010] The elastic beam is bolted to the rotating shaft, a design that converts torsional stiffness into bending stiffness. Simultaneously, based on the principle of geometric amplification, a small torsional clearance can be magnified into a larger linear displacement clearance.

[0011] The V-shaped limiting block is a direct device for providing the clearance. During operation, the elastic beam is inserted into the V-shaped notch, and the distance between the edge of the elastic beam and the two inner edges of the V-shaped limiting block is the direct source of the clearance. The V-shaped limiting block is fixed to the rotary slide, and under the combined action of the R-axis manual rotary slide and the XY dual-axis displacement platform, the clearance amount and the position of the clearance center can be steplessly adjusted.

[0012] The R-axis manual rotary slide is a differential micro-motion rotary slide with graduations, featuring 360° coarse adjustment and 5° fine adjustment. It has a locking knob. Mounted on an XY dual-axis displacement platform, it supports a V-shaped limit block. It allows adjustment of the direction aligned with the V-shaped notch of the limit block.

[0013] The XY-axis dual-axis displacement platform is a differential micro-motion translation slide with graduations in the XY directions, directly fixed to the test platform base, and supporting the R-axis manual rotation slide. The clearance can be changed by adjusting the distance between the V-shaped limit block and the rotating shaft. Simultaneously, by utilizing its two degrees of freedom displacement in the XY plane, in conjunction with the adjustment of the R-axis manual rotation slide, the center of the clearance can be adjusted.

[0014] The beneficial effects of this invention are:

[0015] The segmented torsional stiffness experimental device for stepless adjustable clearance of the present invention converts the rotational clearance of the rotating shaft into the linear distance between one end of the elastic beam and the inner walls of the V-shaped notch on both sides of the V-shaped limiting block. By adjusting the XY-axis displacement platform and the R-axis manual rotating slide, precise adjustment of the total clearance, the clearance on both sides of the equilibrium position, and the equilibrium position can be achieved. Its torsional contact stiffness is equivalent to the bending stiffness of the elastic beam; the contact stiffness is adjusted by changing the length of the elastic beam extending beyond the rotating shaft interface. This method not only achieves the magnification and readability of minute angular clearances but also enables the readability and equivalent adjustment of related parameters of minute angular clearances and torsional contact stiffness. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the key components of the present invention.

[0017] Figure 2 This is a top view of the key structure of this invention.

[0018] Figure 3 This is a side view of the key structure of the present invention.

[0019] Figure 4 This is a schematic diagram of the test bench base.

[0020] Figure 5 This is a schematic diagram of a bearing.

[0021] Figure 6 This is a schematic diagram of the rotating shaft.

[0022] Figure 7 This is a schematic diagram of an elastic beam.

[0023] Figure 8 It is a V-shaped stop.

[0024] Figure 9 This is a schematic diagram of the slide assembly (XY two-axis displacement platform + R-axis manual rotary slide).

[0025] Figure 10 It is a manual rotary slide along the R-axis.

[0026] Figure 11 It is an XY two-axis displacement platform.

[0027] Figure 12 This is a top view of the piecewise linear torsional stiffness test apparatus at the center of the offset gap. Detailed Implementation

[0028] Exemplary implementations will be described in detail herein, with examples illustrated in the accompanying drawings. In designing the drawings, unless otherwise indicated, the same numbers in different drawings represent the same elements.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a nonlinear test device for piecewise linear torsional stiffness, comprising: a test bench base 1, a bearing 2, a rotating shaft 3, an elastic beam 4, a V-shaped limiting block 5, an R-axis manual rotating slide 6, and an XY-axis displacement platform 7.

[0030] Bearing 2 is bolted to one end of the test base 1 along the X-axis, and rotating shaft 3 is installed in bearing 2. One end of elastic beam 4 is inserted into the hole of rudder shaft 3 and fastened with bolts. XY dual-axis displacement platform 7 is bolted to the other end of the test base 1 along the X-axis. The lower part of R-axis manual rotating slide 6 is bolted to the XY dual-axis displacement platform 7, and the upper part is bolted to V-shaped limit block 5.

[0031] The elastic beam 4 is inserted into the V-shaped notch of the V-shaped limiting block 5. The torsional clearance of the rotating shaft is equivalent to the linear displacement gap between the inner wall of the notch and the elastic beam. The torsional stiffness of the rotating shaft 3 is equivalent to the bending stiffness of the elastic beam.

[0032] When it is necessary to change the size of the clearance, simply adjust the XY two-axis displacement platform 7 along the X direction. When it is away from the rudder shaft 3, the clearance increases, and when it is close to the rudder shaft 3, the clearance decreases.

[0033] When it is necessary to change the ratio of the gap between the two sides of the equilibrium position, simply adjust the XY dual-axis displacement platform 7 along the Y-axis.

[0034] On the test platform, the X-axis represents the initial equilibrium position. At this point, the line connecting the origin of the V-shaped notch of the V-shaped limit block 5 and the center of the rotating shaft coincides with the X-axis. When it is necessary to change the equilibrium position, the XY-axis displacement platform 7 and the R-axis manual rotation slide 6 must be adjusted simultaneously so that the line connecting the origin of the V-shaped notch of the V-shaped limit block 5 and the axis of rotation becomes the new reference line, offset from the X-axis by a certain angle. This new line represents the new equilibrium position. At this point, the measurement of the clearance must be based on this new reference line.

[0035] When a dynamic test is required to investigate the piecewise linear torsional stiffness with gaps, the actuator can be connected to the rotating shaft 3. The elastic beam 4 moves with the rotating shaft 3. When one end of the elastic beam 4, which is inserted into the V-shaped notch of the V-shaped limiting block 5, contacts the inner wall of one side of the V-shaped notch, the system is in the contact state on that side, which can reflect the contact stiffness represented by the bending stiffness of the elastic beam. When one end of the elastic beam 4, which is inserted into the V-shaped notch of the V-shaped limiting block 5, does not contact the inner walls of both sides of the V-shaped notch, the system is in the gap dead zone, and its stiffness is zero.

[0036] When it is necessary to adjust the stiffness of the gap contact, simply loosen the nut that fixes the elastic beam 4 on the rotating shaft 3, adjust the distance of the elastic beam from the rotating shaft interface to the end inserted into the V-shaped notch, and then tighten the bolts.

[0037] In this invention, the test bench base has an X-axis reference line passing through the axis of rotation. The XY-axis displacement platform 7 is adjusted by a differential micro-motion mechanism, so there are displacement scale lines with corresponding accuracy. The R-axis manual rotary slide 6 is also adjusted by a differential micro-motion mechanism, so there are angular displacement scale lines with corresponding accuracy. The elastic beam 4 also has corresponding length scales, which can also be directly converted into contact stiffness marking scales.

[0038] Based on the above principles, this invention enables the testing of segmented torsional stiffness with adjustable total clearance, the ratio of clearance on both sides of the equilibrium position, the equilibrium position, and the magnitude of contact stiffness. This adjustment is stepless and provides readable geometric parameters. Furthermore, as long as the structural parameters encompass the test range (range of total clearance variation, range of clearance on both sides of the equilibrium position, range of equilibrium position variation, and range of contact stiffness variation), no parts need to be replaced during the test.

[0039] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by researchers and technicians skilled in the art within the technical scope described in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A segmented torsional stiffness testing device based on adjustable clearance, characterized in that, include: Test bench base (1), bearing (2), rotating shaft (3), elastic beam (4), V-shaped limit block (5), R-axis manual rotary slide (6), XY two-axis displacement platform (7); The test bench base (1) serves as the base for the entire test bench. A bearing (2) is installed on one end of the test bench along the X-axis baseline, and the other end is connected to the XY two-axis displacement platform (7). The bearing (2) is installed on the base (1) to install the rotating shaft (3) and bears certain lateral and axial forces and moments during the test; The rotating shaft (3) is installed in the bearing (2) to provide the rotational motion degree of freedom with gap nonlinearity studied in this test bench. The rotating shaft (3) includes an interface for connecting the elastic beam to ensure that the elastic beam (4) is stably fixed on the rotating shaft (3) during the test. The elastic beam (4) is fastened to the rotating shaft (2) by bolts. This design converts the torsional stiffness into the bending stiffness of the elastic beam (4). Based on the principle of geometric amplification, the tiny torsional gap is amplified into a readable linear displacement gap. The V-shaped limiting block (5) is a direct device for providing the gap. When working, the elastic beam (4) is inserted into the V-shaped notch. The distance between the edge of the elastic beam (4) and the two inner sides of the V-shaped limiting block (5) is the direct source of the gap. The V-shaped limiting block (5) is fixed to the R-axis manual rotary slide (6). Under the combined action of the R-axis manual rotary slide (6) and the XY two-axis displacement platform (7), the gap amount and the position of the gap center can be infinitely adjusted. The R-axis manual rotary slide (6) is a differential micro-motion rotary slide with scales that has 360° coarse adjustment + 5° fine adjustment; it has a locking knob; it is installed on the XY two-axis displacement platform (7) and supports the V-shaped limit block; it can adjust the direction of the V-shaped notch of the V-shaped limit block (5); The XY dual-axis displacement platform (7) is a differential micro-motion translation slide with scales in the XY direction of the plane, which is directly fixed on the test platform base and carries the R-axis manual rotation slide (6). The gap can be changed by adjusting the distance between the V-shaped limit block and the rotating shaft. At the same time, by using its two degrees of freedom displacement in the XY plane, in conjunction with the adjustment of the R-axis manual rotation slide (6), the center of the gap can be adjusted.

2. The segmented torsional stiffness testing device based on adjustable clearance according to claim 1, characterized in that, The torsional clearance parameters include the total clearance amount, the equilibrium position, and the ratio of the clearance amounts on both sides of the equilibrium position.

3. The segmented torsional stiffness testing device based on adjustable clearance according to claim 1, characterized in that, The contact stiffness, which is equivalent to the bending stiffness of the elastic beam (4), can be infinitely adjusted by changing the length of the elastic beam (4) extending out of the pivot (3).

4. The segmented torsional stiffness testing device based on adjustable clearance according to claim 1, characterized in that, The XY two-axis displacement platform (7) is a differential micro-motion translation slide with a scale.

5. The segmented torsional stiffness testing device based on adjustable clearance according to claim 1, characterized in that, The R-axis manual rotary slide (6) is a manual differential micro-motion rotary slide with coarse and fine adjustment scales.

6. The segmented torsional stiffness testing device based on adjustable clearance according to claim 1, characterized in that, The test bench base (1) has a reference line passing through the axis of the rotating shaft (3) on its surface.

7. The segmented torsional stiffness testing device based on adjustable clearance according to claim 1 or 3, characterized in that, The elastic beam (4) is provided with length scale or contact stiffness marking scale.

8. A method for using the segmented torsional stiffness testing apparatus based on adjustable clearance as described in any one of claims 1 to 7, characterized in that, The process includes the following steps: adjusting the XY dual-axis displacement platform (7) to move along the first horizontal axis direction to steplessly adjust the total clearance; adjusting the XY dual-axis displacement platform (7) to move along the second horizontal axis direction perpendicular to the first horizontal axis to steplessly adjust the clearance ratio on both sides of the equilibrium position; coordinating the XY dual-axis displacement platform (7) and the R-axis manual rotation slide (6) to set and lock a new equilibrium position baseline; and adjusting the length of the elastic beam (4) extending out of the rotating shaft (3) to steplessly adjust the equivalent contact stiffness.

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