Radial loading device for a bearing tester

Abstract

The utility model discloses a radial loading device for bearing testing machine, and the installation platform table on both sides of 1 / 3 place of length direction of test platform is equipped with hydraulic oil cylinder through bolt symmetry fixed, and the piston rod of hydraulic oil cylinder sets up to the upwards, and the ear ring of piston rod top is articulated in support seat, and the both ends of support seat upper end surface and loading arm are fixedly connected through bolt, and loading arm straddles the workbench top of test platform, forms the radial loading device of door type structure, and the center line of radial loading device is perpendicular to the center line of test shaft device, and hydraulic oil cylinder and loading arm cooperate and apply radial load to test shaft system device, set up loading support piece avoided the problem that loading arm loses balance under stress in test machine operation, the loading device design structure simple, compact arrangement, and loading arm realizes the radius simulation of test bearing, and loading force simulation is accurate, and the overall test stability of bearing testing machine has been improved.

Description

Technical Field

[0001] This utility model belongs to the field of bearing testing technology, specifically relating to a radial loading device for a bearing testing machine. Background Technology

[0002] Wind turbine bearings are extra-large bearings, typically installed at heights of tens of meters. Under normal operating conditions, they bear radial and axial loads. The bearings operate in harsh environments and are required to work continuously without failure. This necessitates ensuring that each bearing has high reliability. During the design, development, and manufacturing processes, the bearings must be verified under simulated operating conditions on a testing machine.

[0003] The bearing testing machine works by using a motor to provide rotational speed and apply axial and radial loads to the test shaft system to test the bearing's operation. If the bearing testing machine uses multiple loading heads to uniformly load the outer ring of the test bearing circumferentially, the position of the loading heads relative to the test bearing needs to be adjusted during the installation of the test bearing to ensure that the multiple loading heads uniformly load the outer ring of the test bearing in order to test the performance of the test bearing. However, this method has problems such as unstable loading and force not matching reality, and cannot truly simulate the bearing's operating conditions.

[0004] If a bearing testing machine uses a loading arm as a whole, the loading arm providing radial force is loaded by two parallel hydraulic cylinders. When the shaft system is stationary, the two cylinders with the same tension can keep the loading arm balanced on both sides, preventing it from tilting. However, when the test shaft system rotates, the loading arm loses balance due to the radial force, resulting in an excessive tilt angle. Optimizing the design of a radial loading device for bearing testing to ensure the loading arm uniformly applies radial load to the test shaft system and maintains force balance during shaft rotation, thus facilitating successful bearing performance testing, is a problem that urgently needs to be solved. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this utility model provides a radial loading device for a bearing testing machine. It adopts a hydraulic transmission form and loads the test bearing through a gantry-type loading arm. By setting loading support components, it effectively avoids the problem of the loading arm losing balance of force during the operation of the testing machine. The loading device has a simple design and compact layout. The loading arm realizes the radius simulation of the test bearing, and the loading force simulation is more accurate, which improves the overall testing stability of the bearing testing machine.

[0006] The technical solution adopted by this utility model is as follows: a radial loading device for a bearing testing machine, including a test platform, which is a rectangular integral structure. The middle part of the test platform along its length is a worktable, and the two sides of the test platform are mounting platforms. The height of the worktable is higher than the height of the mounting platforms. Hydraulic cylinders are symmetrically fixed on the mounting platform surfaces on both sides at 1 / 3 of the length of the test platform by bolts. The piston rods of the hydraulic cylinders are set upwards, and the lugs at the top of the piston rods are hinged in the support base. A loading support is detachably installed on the outside of the piston rod between the cylinder barrel and the lugs. The upper end face of the support base is fixedly connected to both ends of the loading arm by bolts. The loading arm spans across the worktable of the test platform, forming a portal-type radial loading device. The centerline of the radial loading device is perpendicular to the centerline of the test shaft system. The hydraulic cylinders and the loading arm cooperate to apply radial load to the test shaft system.

[0007] The bottom of the test platform is supported by crisscrossing support plates, forming a hollow table surface. T-slots and elongated holes are provided on the table surface along the length direction. Semi-circular grooves are evenly distributed on the sides of the mounting platforms on both sides of the test platform, and foot mounting holes are provided in the grooves.

[0008] The loading arm includes a loading rod, the upper part of which is a semi-circular arc structure, and the lower part of which smoothly transitions into a straight line along the semi-circular arc. Loading plates are fixedly installed on both sides of the loading rod laterally along the test platform. A reinforcing rib is horizontally installed in the middle of the two loading plates. Mounting seats are horizontally fixed on the outer sides of both ends of the loading plates. The loading rod is a cast square tube.

[0009] The side plate of the mounting base is fixedly covered on both ends of the loading plate and extends towards the loading rod. The side of the mounting base has a long strip-shaped through hole in the vertical direction. The bottom plate of the mounting base is fixed to the upper end face of the support base by bolts.

[0010] The support base is a U-shaped integrated structure. The upper end surface of the support base is flat, and two parallel support side plates with arc-shaped bottoms extend downward perpendicularly to the upper end surface of the support base. The lower part of each support side plate is provided with a through hole. The support base is hinged to the lug at the top of the hydraulic cylinder piston rod through a hinge shaft. The lug is a block structure with an arc-shaped upper part, and the arc-shaped top of the lug extends into the U-shaped groove formed by the two support side plates of the support base.

[0011] The loading support consists of two symmetrical support blocks. The inner wall of each support block is semi-circular. The inner shape and size of the support block are adapted to the shape and size of the piston rod. Bolt holes are provided at the four corners of the support block, and the two support blocks are fixed to the outside of the piston rod by bolts.

[0012] Hydraulic cylinders are symmetrically bolted to the mounting platforms on both sides at one-third of the length of the test platform. The piston rods of the hydraulic cylinders are positioned upwards, and the lugs at the top of the piston rods are hinged to the support base. The upper end face of the support base is fixedly connected to both ends of the loading arm by bolts. The loading arm spans across the worktable of the test platform, forming a gantry-type radial loading device. The purpose of this arrangement is to use a hydraulically driven radial load application mechanism, coupled with a gantry-type loading arm. The semi-circular inner wall of the loading arm contacts the loading wheel outside the outer ring of the bearing under test. Both ends of the loading arm are connected to the hydraulic cylinders. By controlling the pulling force of the hydraulic cylinders, a uniform radial load is applied to the bearing under test. The loading arm simulates the radius of the test bearing, and the loading force simulation is more accurate. This effectively reduces the interference that may be caused to the test data during the loading process, provides high-precision operation support for the dynamic loading of the test system, and improves the test performance of the bearing testing machine.

[0013] A loading support is detachably mounted on the piston rod between the cylinder barrel and the clevis of the hydraulic cylinder. This design is intended to address the issue that, in actual use of the bearing testing machine, the loading arm providing radial force is loaded by two parallel hydraulic cylinders. When the shaft system is stationary, the two hydraulic cylinders with equal tension maintain the loading arm's balance, preventing it from tilting. However, when the shaft system rotates, the loading arm loses balance due to the radial force, causing the piston rods of the two cylinders to experience forces in different directions—one extending and the other retracting—potentially leading to excessive tilting of the loading arm. By installing a detachable loading support between the cylinder barrel and the clevis, a gap is maintained between the loading support and the clevis when the loading arm is balanced and not tilted. When the shaft system rotates and the loading arm tilts, the gap between one of the loading support and the clevis is tightened, allowing the cylinder to "bottom out" earlier, preventing excessive tilting of the loading arm and improving the overall testing stability of the bearing testing machine.

[0014] The beneficial effects of this invention are as follows: This invention provides a stable radial loading device, equipped with a gantry-type loading arm, which applies a uniform radial load to the bearing under test using hydraulic transmission. By setting loading support components, the problem of unbalanced force on the loading arm during the operation of the testing machine is effectively avoided. The device is reliable and easy to operate, and can meet the testing requirements of bearings. It effectively reduces the interference that may be caused to the test data during loading, provides high-precision operation support for the dynamic loading of the test system, and improves the overall test stability and test performance of the bearing testing machine. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the radial loading device of this utility model;

[0016] Figure 2 This is a front view schematic diagram of the radial loading device of this utility model;

[0017] Figure 3 This is a side view of the radial loading device of this utility model.

[0018] Figure 4 This is a top view of the radial loading device of this utility model.

[0019] The markings in the diagram are: 1. Test platform; 2. Workbench; 3. Mounting platform; 4. Hydraulic cylinder; 5. Cylinder barrel; 6. Piston rod; 7. Earring; 8. Support base; 9. Loading arm; 10. Mounting base; 11. T-slot; 12. Groove; 13. Loading rod; 14. Loading plate; 15. Side plate; 16. Supporting side plate; 17. Loading support component; 18. Support block. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-4 As shown, a radial loading device for a bearing testing machine includes a test platform 1, which is a rectangular integral structure. The middle part of the test platform 1 along its length is a workbench 2, and the two sides of the test platform 1 are mounting platforms 3. The height of the workbench 2 is higher than the height of the mounting platforms 3. Hydraulic cylinders 4 are symmetrically fixed to the mounting platforms 3 on both sides at 1 / 3 of the length of the test platform 1 by bolts. The piston rod 6 of the hydraulic cylinder 4 is set upward, and the lug 7 at the top of the piston rod 6 is hinged in the support seat 8. A loading support 17 is detachably provided on the outside of the piston rod 6 between the cylinder barrel 5 of the hydraulic cylinder 4 and the lug 7. The upper end face of the support seat 8 is fixedly connected to both ends of the loading arm 9 by bolts. The loading arm 9 spans across the workbench 2 of the test platform 1, forming a portal-type radial loading device. The centerline of the radial loading device is perpendicular to the centerline of the test shaft device. The hydraulic cylinder 4 and the loading arm 9 cooperate to apply radial load to the test shaft device. The radial load application mechanism adopts hydraulic transmission and is equipped with a gantry-type loading arm 9. The semi-circular inner wall of the loading arm 9 contacts the loading wheel outside the outer ring of the bearing under test. Both ends of the loading arm 9 are connected to the hydraulic cylinder 4. By controlling the pulling force of the hydraulic cylinder 4, a uniform radial load is applied to the bearing under test. The loading arm 9 realizes the radius simulation of the test bearing, and the loading force simulation is more accurate.

[0022] The bottom of the test platform 1 is supported by crisscrossing support plates to form a hollow table surface. T-slots 11 and elongated holes are provided on the table surface of the workbench 2 along the length direction. Semi-circular grooves 12 are evenly distributed on the sides of the mounting platforms 3 on both sides of the test platform 1, and foot mounting holes are provided in the grooves 12.

[0023] The loading arm 9 includes a loading rod 13. The upper part of the loading rod 13 has a semi-circular arc structure, and the lower part of the loading rod 13 smoothly transitions into a straight line segment along the semi-circular arc. Loading plates 14 are fixedly installed on both sides of the loading rod 13 laterally along the test platform 1. A horizontal reinforcing rib is horizontally installed in the middle of the two loading plates 14. Mounting seats 10 are horizontally fixed on the outer sides of both ends of the loading plates 14. The loading arm can be integrally cast. The loading rod 13 is a cast square tube. The shape and size of the loading rod 13 are adapted to the shape and size of the loading wheel on the outside of the bearing to be tested in the test shaft system device.

[0024] The side plate 15 of the mounting base 10 is fixedly covered on both ends of the loading plate 14 and extends towards the loading rod 13. The side of the mounting base 10 has a long strip-shaped through hole in the vertical direction. The bottom plate of the mounting base 10 is fixed to the upper end face of the support base 8 by bolts.

[0025] The support base 8 is a U-shaped integral structure. The upper end surface of the support base 8 is flat. Two parallel support side plates 16 with arc-shaped bottoms extend downward perpendicularly to the upper end surface of the support base 8. The lower part of each support side plate 16 is provided with a through hole. The support base 8 is hinged to the lug 7 at the top of the piston rod 6 of the hydraulic cylinder 4 through a hinge shaft. The lug 7 is a block structure with an arc-shaped upper part. The arc-shaped top of the lug 7 extends into the U-shaped groove formed by the two support side plates 16 of the support base 8.

[0026] The loading support 17 consists of two symmetrical support blocks 18. The inner wall of each support block 18 is semi-circular. The inner shape and size of the support block 18 are adapted to the shape and size of the piston rod 6. Bolt holes are provided at the four corners of the support block 18. The two support blocks 18 are fixed to the outside of the piston rod 6 by bolts to prevent the loading arm 9 from losing balance after being subjected to radial force.

[0027] In use, after the workbench 2 and mounting platform 3 of the test platform 1 are assembled in place, they are fixed to the ground by bolts through the mounting holes in the grooves 12 on both sides of the mounting platform 3. The hydraulic cylinder 4 is symmetrically installed on the mounting platforms 3 on both sides of the test platform 1 by bolts. The piston rod 6 of the hydraulic cylinder 4 extends upward. The lug 7 at the top of the piston rod 6 is hinged to the support side plate 16 of the support seat 8 through the hinge shaft. The upper end face of the support seat 8 is fixedly connected to the bottom plate of the mounting seat 10 by bolts. The loading arm 9 is installed across the workbench 2 of the test platform 1 to form a radial loading device with a portal structure. Then, the loading support 17 is installed on the outside of the piston rod 6 between the cylinder barrel 5 of the hydraulic cylinder 4 and the lug 7. The test shaft system of the bearing testing machine is installed on the workbench 2 along the length of the test platform 1. Its position can be adjusted along the T-slot 11 on the workbench. The centerline of the radial loading device is perpendicular to the centerline of the test shaft system. The loading arm 9 of the radial loading device contacts the loading wheel outside the bearing to be tested in the test shaft system. The motor drives the inner ring of the bearing in the test shaft system to rotate, while the outer ring of the bearing and the loading wheel remain stationary. The hydraulic cylinder 4 and the loading arm 9 work together to uniformly apply radial force to the loading wheel of the bearing to be tested, so as to carry out the radial load test of the bearing. This device is reliable and easy to operate, and can meet the testing requirements of the bearing. It effectively reduces the interference that may be caused to the test data during the loading process, provides high-precision operation support for the dynamic loading of the test system, and improves the overall test stability and test performance of the bearing testing machine.

[0028] The parts of this invention not described in detail are prior art. Besides the embodiments described above, this utility model may have other implementations, and all technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

Claims

1. A radial loading device for a bearing testing machine, characterized in that: The test platform is a rectangular integrated structure. The middle part along the length of the test platform is the workbench, and the two sides of the test platform are the mounting platforms. The height of the workbench is higher than that of the mounting platforms. Hydraulic cylinders are symmetrically fixed to the mounting platforms on both sides at 1 / 3 of the length of the test platform by bolts. The piston rods of the hydraulic cylinders are set upwards, and the lugs at the top of the piston rods are hinged in the support base. A loading support is detachably installed on the outside of the piston rod between the cylinder barrel and the lugs. The upper end face of the support base is fixedly connected to both ends of the loading arm by bolts. The loading arm spans across the workbench of the test platform, forming a radial loading device with a portal structure. The centerline of the radial loading device is perpendicular to the centerline of the test shaft device. The hydraulic cylinders and the loading arm cooperate to apply radial load to the test shaft device.

2. The radial loading device for a bearing testing machine according to claim 1, characterized in that: The bottom of the test platform is supported by crisscrossing support plates, forming a hollow table surface. T-slots and elongated holes are provided on the table surface along the length direction. Semi-circular grooves are evenly distributed on the sides of the mounting platforms on both sides of the test platform, and foot mounting holes are provided in the grooves.

3. The radial loading device for a bearing testing machine according to claim 1, characterized in that: The loading arm includes a loading rod, the upper part of which is a semi-circular arc structure, and the lower part of which smoothly transitions into a straight line along the semi-circular arc. Loading plates are fixedly installed on both sides of the loading rod laterally along the test platform. A reinforcing rib is horizontally installed in the middle of the two loading plates. Mounting seats are horizontally fixed on the outer sides of both ends of the loading plates. The loading rod is a cast square tube.

4. A radial loading device for a bearing testing machine according to claim 3, characterized in that: The side plate of the mounting base is fixedly covered on both ends of the loading plate and extends towards the loading rod. The side of the mounting base has a long strip-shaped through hole in the vertical direction. The bottom plate of the mounting base is fixed to the upper end of the support base by bolts.

5. A radial loading device for a bearing testing machine according to claim 1, characterized in that: The support base is a U-shaped integrated structure. The upper surface of the support base is flat, and two parallel support side plates with arc-shaped bottoms extend downwards perpendicular to the upper surface of the support base. The lower part of each support side plate is provided with a through hole. The support base is hinged to the lug at the top of the hydraulic cylinder piston rod through a hinge shaft. The lug is a block structure with an arc-shaped upper part, and the arc-shaped top of the lug extends into the U-shaped groove formed by the two support side plates of the support base.

6. A radial loading device for a bearing testing machine according to claim 1, characterized in that: The loading support consists of two symmetrical support blocks. The inner wall of each support block is semi-circular. The inner shape and size of the support block are matched with the shape and size of the piston rod. Bolt holes are provided at the four corners of the support block, and the two support blocks are fixed to the outside of the piston rod by bolts.

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