A static load stiffness testing fixture for slewing support mechanisms

Abstract

This invention relates to a static load stiffness testing fixture for a slewing support mechanism, belonging to the field of space science and technology. A U-shaped handle is fixedly installed on the test guide rail fixture. A tension / compression block is installed on the top of the U-shaped handle. A support is installed on the top of the mounting base. The bottom of the support is a flat plate structure. Four columns are provided on the top of the flat plate structure. Horizontal linear bearing guide rods are inserted into two horizontally placed linear bearing shafts. Vertical linear bearing guide rods are inserted into two vertically placed linear bearing shafts. The test guide rail fixture is installed on the columns of the support. After the external slewing support assembly is assembled into the static load stiffness testing fixture, the stiffness of the external slewing support assembly is tested. This invention, by applying more constraints to the test fixture guide rail, transforms the unstable contact state between the slewing support assembly and the guide rail into a stable contact state, ensuring product safety while guaranteeing the normal conduct of testing and resulting in more accurate test results.

Description

Technical Field

[0001] This invention belongs to the field of space science and technology, and relates to a static load stiffness testing fixture applied to a slewing support mechanism. Background Technology

[0002] The long-term power supply for the space station's operation in orbit primarily comes from the large flexible solar array at the end of the experimental module. To maximize the solar array's power generation capacity, a solar orientation device with high-power electrical transmission and driving solar orientation capabilities is installed at the end of the experimental module. The stable rotation of this solar orientation device in orbit relies on an internal gyroscopic support mechanism. This mechanism consists of a set of triangular-section circular guide rails and multiple sets of circumferentially distributed gyroscopic support components. Each gyroscopic support component is connected to three faces of the circular guide rail via three sets of bearings, clamping the guide rail and allowing it to rotate around its own axis, providing stable gyroscopic support. While the mechanism composed of multiple gyroscopic support components and the circular guide rails is stable, the combination of a single gyroscopic support component and the guide rail is unstable. This is mainly because the contact between a single bearing and a single face of the guide rail in a single gyroscopic support component is a line contact, while the contact between a single gyroscopic support component and the guide rail involves three lines, resulting in an unstable contact state. The mechanism composed of multiple sets of slewing bearing assemblies and guide rails achieves a stable contact state due to the increased support (multiple lines of contact with the same support). However, the unstable contact between a single slewing bearing assembly and the guide rail makes measuring the stiffness and load-bearing capacity of the slewing bearing assembly extremely difficult. During testing, issues with the installation accuracy of the test force loading equipment can easily cause the force application point to not be coplanar with the three bearing-guide rail contact lines, leading to lateral slippage between the test fixture guide rail and the slewing bearing assembly. This prevents the test from proceeding normally, results in significant deviations, and poses certain safety risks to the product. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a static load stiffness test fixture for slewing support mechanisms. By applying more constraints to the guide rail of the test fixture, the unstable contact state between the slewing support assembly and the guide rail is transformed into a stable contact state, ensuring product safety while guaranteeing the normal conduct of the test and making the test results more accurate.

[0004] The solution of the present invention is:

[0005] A static load stiffness testing fixture for a slewing support mechanism includes a support, a test guide rail fixture, a U-shaped handle, a tension / compression block, four linear bearings, two horizontal linear bearing guide rods, two vertical linear bearing guide rods, and a mounting base.

[0006] The test guide fixture is placed horizontally along the axis; two linear bearings are symmetrically installed horizontally along the same side wall of the test guide fixture; two other linear bearings are installed vertically along the top of the test guide fixture; a U-shaped handle is fixedly installed on the top of the test guide fixture; a tension / compression block is installed on the top of the U-shaped handle; a cube structure with a horizontally placed mounting base is installed; a support is installed on the top of the mounting base; the bottom of the support is a flat plate structure; four columns are set on the top of the flat plate structure; horizontal linear bearing guide rods are inserted into the corresponding two horizontally placed linear bearing shafts; vertical linear bearing guide rods are inserted into the corresponding two vertically placed linear bearing shafts; the test guide fixture is installed on the columns of the support; after the external slewing bearing assembly is assembled into the static load stiffness test fixture, the stiffness of the external slewing bearing assembly is tested.

[0007] In the aforementioned static load stiffness testing fixture applied to a slewing support mechanism, the distance between two horizontally placed linear bearings is less than the distance between two vertically placed linear bearings, and they are arranged in a staggered manner.

[0008] In the aforementioned static load stiffness testing fixture for a slewing support mechanism, the top of the U-shaped handle is provided with a threaded hole, which is connected to the tension / compression block; tension / compression load is applied through the tension / compression block; the U-shaped handle mounting threaded hole on the test guide fixture is selected according to the direction of the test load, and the U-shaped handle is installed onto the test guide fixture using U-shaped handle mounting screws.

[0009] In the above-mentioned static load stiffness test fixture applied to a slewing support mechanism, the upper surface of the middle part of the test guide fixture has a pointed corner structure with an angle of 90°; the two side walls of the pointed corner are symmetrically arranged.

[0010] In the aforementioned static load stiffness testing fixture applied to a slewing support mechanism, three bearings are provided on the top of the external slewing support assembly, with two bearings symmetrically arranged on the top and the other bearing arranged on the bottom.

[0011] In the aforementioned static load stiffness test fixture applied to a slewing support mechanism, when the external slewing bearing assembly is assembled on the static load stiffness test fixture, the bottom of the external slewing bearing assembly is fixedly installed on the flat plate structure at the bottom of the support; the two bearings at the top are in contact with the two side walls of the central sharp corner structure of the test guide fixture, and the one bearing at the bottom is in contact with the bottom surface of the test guide fixture.

[0012] In the aforementioned static load stiffness testing fixture applied to a slewing support mechanism, when conducting a vertical stiffness test:

[0013] The static load stiffness test fixture equipped with the external slewing bearing assembly is placed vertically; two vertical linear bearing guide rods are inserted into the corresponding vertically placed two linear bearing shafts to achieve limiting in directions other than the vertical direction; two horizontal linear bearing guide rods are not inserted; vertical upward or downward force is applied by the tension and compression blocks to conduct the vertical stiffness test.

[0014] In the aforementioned static load stiffness testing fixture applied to a slewing support mechanism, when conducting a vertical stiffness test:

[0015] Rotate the static load stiffness test fixture equipped with the external slewing bearing assembly 90° to a horizontal position; insert the two horizontal linear bearing guide rods into the corresponding horizontally placed two linear bearing shafts to limit movement in all directions except the vertical direction; do not insert the two vertical linear bearing guide rods; remove the U-shaped handle and the tension / compression block; install the U-shaped handle on the side wall of the test guide fixture, i.e., at the top of the test guide fixture at this point; install the tension / compression block on the top of the U-shaped handle; apply a vertically upward or downward force through the tension / compression block to conduct a vertical stiffness test.

[0016] In the aforementioned static load stiffness testing fixture applied to a slewing support mechanism, when the external slewing support assembly is assembled on the static load stiffness testing fixture, after the three bearings of the external slewing support assembly contact the three side walls of the test guide fixture respectively, a feeler gauge is used to measure the gap between the bottom plane of the external slewing support assembly and the upper surface of the base plate of the support; according to the measurement results, an adjustment shim of corresponding thickness is inserted into the gap, and finally, the mounting screws of the slewing support assembly are tightened from the lower surface of the base plate of the support to complete the product installation of the slewing support assembly.

[0017] In the aforementioned static load stiffness testing fixture applied to a slewing bearing mechanism, when conducting stiffness tests on external slewing bearing components, the tension / compression block is connected to the external test equipment force loading device, and a displacement sensor required for the test is installed.

[0018] The advantages of this invention compared to the prior art are:

[0019] (1) The present invention can constrain the degree of freedom of the test guide rail fixture, so that the rotary support component and the test guide rail fixture can be in stable contact, reducing the difficulty of installing the test equipment, greatly improving the test success rate, and shortening the test time;

[0020] (2) The present invention can improve the installation accuracy of the load application point and the test position. The relative positions of the tension and compression block, the test guide rail fixture and the rotary support assembly remain unchanged. During the test, the test guide rail fixture moves stably along the test direction without deviation.

[0021] (3) The present invention is easy to use and has a high utilization rate of parts. In the static load and stiffness test of the product in different directions, there is no need to disassemble the product. Only the installation position of the U-shaped handle needs to be adjusted. The U-shaped handle is easy to disassemble and reusable, which improves the utilization rate of parts and reduces the tooling production cost.

[0022] (4) This invention has strong overall integrity, making it convenient to carry and store. When both pairs of linear bearing guide rods are fully inserted, all relative degrees of freedom between the test guide rail fixture and the support are constrained, meaning the fixture as a whole has self-locking capability and becomes a single unit. Furthermore, the U-shaped handle takes ergonomics into account, employing a U-shaped design for easy gripping. When not in use, the fixture can be stored as a single item, which is simple and convenient, and it is not easily lost when reused. Attached Figure Description

[0023] Figure 1 This is an exploded view of the static load stiffness test fixture of the present invention;

[0024] Figure 2 This is a schematic diagram of the assembly of the static load stiffness testing fixture of the present invention without a mounting base;

[0025] Figure 3 This is a schematic diagram of the pointed tip of the test guide rail tooling of the present invention;

[0026] Figure 4 This is a schematic diagram showing the fit between the external slewing bearing assembly and the test guide rail fixture of the present invention;

[0027] Figure 5 This is a schematic diagram of the vertical stiffness test for this invention;

[0028] Figure 6 This is a schematic diagram of the horizontal stiffness test conducted for this invention. Detailed Implementation

[0029] The present invention will be further described below with reference to the embodiments.

[0030] This invention provides a static load stiffness testing fixture for a slewing support mechanism, ensuring product safety while achieving a steady-state contact between the slewing support assembly and the guide rail, guaranteeing the normal conduct of static load and stiffness tests, improving the accuracy of test results, and reducing the requirements for the installation precision of the test equipment.

[0031] Static stiffness testing fixtures applied to slewing support mechanisms, such as Figure 1 As shown, it specifically includes a support, a test guide rail fixture, a U-shaped handle, a tension / compression block, four linear bearings, two horizontal linear bearing guide rods, two vertical linear bearing guide rods, and a mounting base.

[0032] The test guide fixture is horizontally positioned axially; two linear bearings are symmetrically mounted horizontally on the same side wall of the test guide fixture; two other linear bearings are vertically mounted on the top of the test guide fixture; a U-shaped handle is fixedly mounted on the top of the test guide fixture; a tension / compression block is mounted on the top of the U-shaped handle; a horizontally positioned cubic structure is used as the mounting base; a support is mounted on top of the mounting base; the bottom of the support is a flat plate structure; four columns are set on the top of the flat plate structure; horizontal linear bearing guide rods are inserted into the corresponding horizontally positioned two linear bearing shafts; vertical linear bearing guide rods are inserted into the corresponding vertically positioned two linear bearing shafts; the test guide fixture is mounted on the columns of the support, such as... Figure 2 As shown. After the external slewing bearing assembly is assembled into the static load stiffness test fixture, the stiffness of the external slewing bearing assembly is tested.

[0033] Four sets of linear bearings are embedded and fixed to two mutually perpendicular surfaces of the test guide fixture using linear bearing mounting screws. They are arranged in pairs and do not need to be disassembled during the experiment, thus forming the test guide fixture assembly. The spacing between the two horizontally placed linear bearings is smaller than the spacing between the two vertically placed linear bearings, and they are staggered.

[0034] The top of the U-shaped handle is provided with a threaded hole, which is connected to the tension and compression block. Tension and compression loads are applied through the tension and compression block. Select the U-shaped handle mounting threaded hole on the test guide fixture according to the direction of the test load, and install the U-shaped handle onto the test guide fixture using the U-shaped handle mounting screw.

[0035] like Figure 3 As shown, the upper surface of the test guide fixture has a pointed corner structure with an angle of 90°; the two side walls of the pointed corner are symmetrically arranged. The top of the external slewing bearing assembly has three bearings, with two bearings symmetrically arranged at the top and the other bearing arranged at the bottom.

[0036] like Figure 4 As shown, when the external slewing bearing assembly is assembled on the static load stiffness test fixture, the bottom of the external slewing bearing assembly is fixedly installed on the flat plate structure at the bottom of the support; the two bearings at the top are in contact with the two side walls of the central sharp corner structure of the test guide fixture, and the one bearing at the bottom is in contact with the bottom surface of the test guide fixture.

[0037] When the external slewing bearing assembly is assembled on the static load stiffness test fixture, after the three bearings of the external slewing bearing assembly contact the three side walls of the test guide fixture, a feeler gauge is used to measure the gap between the bottom plane of the external slewing bearing assembly and the upper surface of the base plate of the support. According to the measurement results, an adjustment shim of corresponding thickness is inserted into the gap. Finally, the mounting screws of the slewing bearing assembly are tightened from the lower surface of the base plate of the support to complete the product installation of the slewing bearing assembly.

[0038] like Figure 5 As shown, when conducting a vertical stiffness test:

[0039] The static load stiffness test fixture equipped with the external slewing bearing assembly is placed vertically; two vertical linear bearing guide rods are inserted into the corresponding vertically placed two linear bearing shafts to achieve limiting in directions other than the vertical direction; two horizontal linear bearing guide rods are not inserted; vertical upward or downward force is applied by the tension and compression blocks to conduct the vertical stiffness test.

[0040] like Figure 6 As shown, when conducting a vertical stiffness test:

[0041] Rotate the static load stiffness test fixture equipped with the external slewing bearing assembly 90° to a horizontal position; insert the two horizontal linear bearing guide rods into the corresponding horizontally placed two linear bearing shafts to limit movement in all directions except the vertical direction; do not insert the two vertical linear bearing guide rods; remove the U-shaped handle and the tension / compression block; install the U-shaped handle on the side wall of the test guide fixture, i.e., at the top of the test guide fixture at this point; install the tension / compression block on the top of the U-shaped handle; apply a vertically upward or downward force through the tension / compression block to conduct a vertical stiffness test.

[0042] When conducting stiffness tests on external slewing bearing components, the tension / compression block is connected to the external test equipment force loading device, and the displacement sensor required for the test is installed.

[0043] The installation principle of this invention is as follows:

[0044] During the installation of the slewing bearing assembly, both pairs of linear bearing guide rods are inserted into the corresponding countersunk holes of the linear bearings and supports, such as... Figure 5 As shown, at this point, the slewing support assembly is installed onto the test guide rail, with the three bearings of the slewing support assembly in contact with the three surfaces of the guide rail. Then, a feeler gauge is used to measure the gap between the bottom plane of the slewing support assembly and the upper surface of the support base plate. Based on the measurement results, adjusting shims of corresponding thickness are inserted into the gap. Finally, the mounting screws of the slewing support assembly are tightened from behind the lower surface of the support base plate, completing the installation of the slewing support assembly.

[0045] The working principle during testing is as follows: After the slewing support assembly is installed, the entire assembly is mounted to the mounting base of the static load stiffness testing equipment using screws. When conducting static load and stiffness tests in direction 1, the U-shaped handle along with the tension / compression block is installed onto the corresponding direction 1 handle mounting surface of the test guide fixture. The mounting base of the testing equipment is placed vertically, adjusted, and then fixed to the test bench to ensure stability. At this point, the pair of linear bearing guide rods aligned with direction 1 are retained, while the pair of linear bearing guide rods perpendicular to direction 1 (i.e., aligned with direction 2) are removed. Finally, the tension / compression block is connected to the force loading device of the testing equipment, and the displacement sensor required for the test is installed. Then, the static load and stiffness tests in direction 1 can be conducted. When switching to static load and stiffness tests in direction 2, the connection between the tension / compression block and the force loading device of the testing equipment is loosened, and the displacement sensor required for the test is removed. Insert a pair of linear bearing guide rods perpendicular to direction 1. Remove the U-shaped handle along with the tension / compression block from the direction 1 handle mounting surface of the test guide fixture and reinstall it onto the direction 2 handle mounting surface. Loosen the connection between the mounting base of the test equipment and the test bench, rotate the test base 90°, readjust its position, and fix it on the test bench to ensure the fixture is stable. At this point, retain the pair of linear bearing guide rods aligned with direction 2 and remove the pair of linear bearing guide rods perpendicular to direction 2 (i.e., aligned with direction 1). Finally, connect the tension / compression block to the force loading device of the test equipment and install the displacement sensor required for the test. The static load and stiffness tests in direction 2 can then be carried out.

[0046] The principle behind this invention's improvement in test result accuracy is as follows: During the test, a pair of linear bearings and their guide rods constrain the movement of the test guide fixture, retaining only the degree of freedom for movement along the test direction. This ensures stable contact between the product and the fixture, while simultaneously improving the positional accuracy of the load application point. Under externally applied loads, the test guide fixture moves only along the test direction, thus allowing the testing of the slewing support assembly's load-bearing capacity and stiffness in that direction. Since the linear bearings experience minimal resistance to movement on the guide rods, this does not affect the accuracy of the test results. In fact, the improved positional accuracy of the load application point and the stable test state of the product enhance the accuracy of the test results.

[0047] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A static load stiffness testing fixture applied to a slewing support mechanism, characterized in that: It includes a support, a test guide rail fixture, a U-shaped handle, a tension / compression block, four linear bearings, two horizontal linear bearing guide rods, two vertical linear bearing guide rods, and a mounting base; The test guide fixture is horizontally positioned axially; two linear bearings are symmetrically mounted horizontally on the same side wall of the test guide fixture; two other linear bearings are vertically mounted on the top of the test guide fixture; a U-shaped handle is fixedly mounted on the top of the test guide fixture; a tension / compression block is mounted on the top of the U-shaped handle; a cube structure with a horizontally positioned mounting base is present; a support is mounted on top of the mounting base; the bottom of the support is a flat plate structure; four columns are set on the top of the flat plate structure; horizontal linear bearing guide rods are inserted into the corresponding horizontally positioned two linear bearing shafts; vertical linear bearing guide rods are inserted into the corresponding vertically positioned two linear bearing shafts; the test guide fixture is mounted on the columns of the support; after the external slewing bearing assembly is assembled into the static load stiffness test fixture, the stiffness of the external slewing bearing assembly is tested. The upper surface of the middle part of the test guide fixture has a pointed corner structure with an angle of 90°; the two side walls of the pointed corner are symmetrically arranged. The top of the external slewing bearing assembly is provided with three bearings, two of which are symmetrically arranged on the top and the other bearing is arranged on the bottom. When the external slewing bearing assembly is assembled on the static load stiffness test fixture, the bottom of the external slewing bearing assembly is fixedly installed on the flat plate structure at the bottom of the support; the two bearings at the top are in contact with the two side walls of the central sharp corner structure of the test guide fixture, and the one bearing at the bottom is in contact with the bottom surface of the test guide fixture.

2. The static load stiffness testing fixture for a slewing support mechanism according to claim 1, characterized in that: The distance between two horizontally placed linear bearings is less than the distance between two vertically placed linear bearings, and they are arranged in a staggered manner.

3. The static load stiffness testing fixture for a slewing support mechanism according to claim 1, characterized in that: The top of the U-shaped handle is provided with a threaded hole, which is connected to the tension and compression block; tension and compression loads are applied through the tension and compression block; the U-shaped handle mounting threaded hole on the test guide fixture is selected according to the direction of the test load, and the U-shaped handle is installed onto the test guide fixture by U-shaped handle mounting screws.

4. The static load stiffness testing fixture for a slewing support mechanism according to claim 3, characterized in that: When conducting a vertical stiffness test: The static load stiffness test fixture equipped with the external slewing bearing assembly is placed vertically; two vertical linear bearing guide rods are inserted into the corresponding vertically placed two linear bearing shafts to achieve limiting in directions other than vertical; two horizontal linear bearing guide rods are not inserted; vertical upward or downward force is applied by the tension and compression blocks to conduct the vertical stiffness test.

5. The static load stiffness testing fixture for a slewing support mechanism according to claim 4, characterized in that: When conducting a horizontal stiffness test: Rotate the static load stiffness test fixture equipped with the external slewing bearing assembly 90° to a horizontal position; insert two horizontal linear bearing guide rods into the corresponding horizontally positioned two linear bearing shafts to limit movement in directions other than the horizontal direction at this time; do not insert the two vertical linear bearing guide rods; remove the U-shaped handle and tension / compression block; install the U-shaped handle on the side wall of the test guide fixture, i.e., at the top of the test guide fixture at this time; install the tension / compression block on the top of the U-shaped handle; apply a vertically upward or downward force through the tension / compression block to conduct a horizontal stiffness test.

6. The static load stiffness testing fixture for a slewing support mechanism according to claim 5, characterized in that: When the external slewing bearing assembly is assembled on the static load stiffness test fixture, after the three bearings of the external slewing bearing assembly contact the three side walls of the test guide fixture, a feeler gauge is used to measure the gap between the bottom plane of the external slewing bearing assembly and the upper surface of the base plate of the support. According to the measurement results, an adjustment shim of corresponding thickness is inserted into the gap. Finally, the mounting screws of the slewing bearing assembly are tightened from the lower surface of the base plate of the support to complete the product installation of the slewing bearing assembly.

7. The static load stiffness testing fixture for a slewing support mechanism according to claim 6, characterized in that: When conducting stiffness tests on external slewing bearing components, the tension / compression block is connected to the external test equipment force loading device, and the displacement sensor required for the test is installed.

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