Bending moment loading device, detection system and bending moment loading method

Abstract

The application discloses a bending moment loading device, a detection system and a bending moment loading method, and relates to the technical field of bearing detection. The bending moment loading device comprises a fixing support and a plurality of loading hydraulic cylinders. The fixing support is used for fixing one of the inner ring and the outer ring. The loading hydraulic cylinders are used for being arranged at intervals along the circumferential direction of the slewing bearing. When being projected along the slewing axis, the projection of the other one of the inner ring and the outer ring at least partially covers the loading hydraulic cylinders. The loading hydraulic cylinders are used for applying forces to the other one of the inner ring and the outer ring. When it is necessary to check the slewing bearing, a plurality of forces can be applied to the inner ring or the outer ring by the plurality of loading hydraulic cylinders in the whole circumferential range, so that a load similar to a sine distribution is formed to simulate the bending moment borne by the slewing bearing. Compared with simulation testing, the bending moment loading device reduces uncontrollable factors, improves testing precision, and is beneficial to improving the checking accuracy of the slewing bearing.

Description

Technical Field

[0001] This invention relates to the field of bearing testing technology, and in particular to a bending moment loading device, testing system and bending moment loading method. Background Technology

[0002] Slewing bearings are widely used large bearings capable of withstanding comprehensive loads, including large axial and radial loads and overturning moments. They are frequently used in the design of large-scale tooling for nuclear power plants, such as in the installation of maintenance arches for nuclear power plant maintenance systems and slewing platforms for large container equipment.

[0003] Slewing bearings are the main load-bearing components. Initial selection is typically based on the standard JB / T2300-2011, followed by detailed verification through finite element analysis. However, conducting simulation testing for benchmarking is difficult due to numerous uncontrollable factors, often resulting in significant discrepancies between simulation and test data, thus requiring improvement in the accuracy of the verification. Summary of the Invention

[0004] The main objective of this invention is to provide a bending moment loading device to improve the accuracy of the verification.

[0005] To achieve the above objectives, the present invention proposes a moment loading device for a slewing bearing, the slewing bearing being used in nuclear power plant fixtures. The slewing bearing includes an inner ring and an outer ring that can rotate relative to each other about a rotation axis. The moment loading device includes a fixed support and a plurality of loading hydraulic cylinders. The fixed support is used to fix one of the inner ring and the outer ring. The loading hydraulic cylinders are arranged at intervals along the circumferential direction of the slewing bearing. Projecting along the rotation axis, the projection of the other of the inner ring and the outer ring at least partially covers the loading hydraulic cylinder. The loading hydraulic cylinder is used to apply a force to the other of the inner ring and the outer ring.

[0006] Optionally, the bending moment loading device further includes a support ring, the axial end face of which is fixedly connected to the axial end face of the inner ring or the axial end face of the outer ring; the maximum force of the loading hydraulic cylinder is greater than or equal to 10 tons and less than or equal to 100 tons, and the loading hydraulic cylinder is used to abut against the support ring and apply force to the corresponding inner ring or outer ring through the support ring.

[0007] Optionally, the inner ring has an inner mounting through hole extending along the height direction, and the outer ring has an outer mounting through hole extending along the height direction; the axial end face of the support ring has a first threaded hole, and the bending moment loading device further includes a connecting rod and a nut, both ends of the connecting rod having external threads; one end of the connecting rod passes through the inner mounting through hole or the outer mounting through hole and is threadedly connected to the first threaded hole, and the nut is threadedly connected to the other end of the connecting rod and abuts against the corresponding inner ring or the outer ring.

[0008] Optionally, some of the loading hydraulic cylinders are configured as tension hydraulic cylinders, and others are configured as thrust hydraulic cylinders. Projected along the axis of rotation, the projection of one of the inner and outer rings includes a first semi-ring portion and a second semi-ring portion. The projection of the tension hydraulic cylinder is at least partially within the first semi-ring portion, and the tension hydraulic cylinders are spaced apart along the circumferential direction of the first semi-ring portion. The projection of the thrust hydraulic cylinder is at least partially within the second semi-ring portion, and the thrust hydraulic cylinders are spaced apart along the circumferential direction of the second semi-ring portion. The bending moment loading device also includes a base plate, the fixed bracket is fixedly connected to the base plate, and the thrust hydraulic cylinder is disposed between the base plate and the slewing bearing. The base plate has a through structure, and the cylinder body portion of the tension hydraulic cylinder is fixedly connected to the side of the base plate facing away from the slewing bearing. The axial end face of the support ring facing away from the slewing bearing has a second threaded hole, and the output end of the tension hydraulic cylinder has a threaded rod that passes through the through structure and is threadedly connected to the second threaded hole.

[0009] Optionally, the fixed bracket includes multiple columns and multiple connecting plates arranged sequentially along the circumferential direction of the slewing bearing. The columns are spaced apart along the circumferential direction of the slewing bearing, and the connecting plates are fixedly connected to the columns one-to-one. The surface of the connecting plate is fixedly connected to the axial end face of one of the inner ring and the outer ring. The columns are spaced apart from the corresponding inner ring or outer ring. And / or, the base plate is provided with multiple rows of through structures, the through structures in the same row are spaced apart on a preset arc, and the through structures in adjacent rows are spaced apart.

[0010] Optionally, the fixing bracket includes a first ring plate and a second ring plate, the thickness direction of the first ring plate is perpendicular to the thickness direction of the second ring plate, and the axial end face of the first ring plate is fixedly connected to the surface of the second ring plate; the axial end face of the first ring plate is fixedly connected to the axial end face of the inner ring or the outer ring, the second ring plate includes a connecting portion, the connecting portion extends out of the first ring plate in a direction toward the other of the inner ring and the outer ring, and the loading hydraulic cylinder is connected to the connecting portion; when the axial end face of the first ring plate is fixedly connected to the axial end face of the inner ring, the first ring plate... The outer peripheral wall is spaced apart from the inner peripheral wall of the outer ring; or when the axial end face of the first ring plate is fixedly connected to the axial end face of the outer ring, the inner peripheral wall of the first ring plate is spaced apart from the outer peripheral wall of the inner ring; and / or, the first ring plate and the support ring are disposed on the same side of the slewing bearing, and when the axial end face of the first ring plate is fixedly connected to the axial end face of the inner ring, the outer peripheral wall of the first ring plate is spaced apart from the inner peripheral wall of the support ring; or when the axial end face of the first ring plate is fixedly connected to the axial end face of the outer ring, the inner peripheral wall of the first ring plate is spaced apart from the outer peripheral wall of the support ring.

[0011] Optionally, all loading hydraulic cylinders are configured as thrust hydraulic cylinders; the bending moment loading device further includes a washer ring, which is disposed between the axial end face of the inner ring or the axial end face of the outer ring and the thrust hydraulic cylinder, one side of the washer ring abutting against the axial end face of the inner ring or the axial end face of the outer ring, and the other side of the washer ring abutting against the thrust hydraulic cylinder; and / or, the loading hydraulic cylinder includes an inlet, an outlet, and an adjusting valve, the inlet and the outlet being used to connect to a hydraulic pipeline, and the loading hydraulic cylinder further includes a pressure sensor for detecting the output force; the pressure sensor is used to output a pressure detection value, and the adjusting valve is used to adjust the output force of the loading hydraulic cylinder; and / or, some of the loading hydraulic cylinders are configured as tension hydraulic cylinders, and other parts of the loading hydraulic cylinders are configured as thrust hydraulic cylinders; along the circumferential direction of the slewing bearing, a thrust hydraulic cylinder is provided between any two adjacent tension hydraulic cylinders.

[0012] The present invention also proposes a detection system, which includes a detection component and the aforementioned bending moment loading device, wherein the detection component is used to detect the stress or strain of the slewing bearing.

[0013] Optionally, the detection assembly includes a mounting ring and a plurality of strain gauges disposed on the mounting ring. The mounting ring is disposed inside the inner ring or outside the outer ring, and the strain gauges are disposed on the side of the mounting ring facing the inner ring and in contact with the inner ring, or the strain gauges are disposed on the side facing the outer ring and in contact with the outer ring.

[0014] The present invention also proposes a bending moment loading method, which is applied to the above-mentioned bending moment loading device, and the bending moment loading method includes the following steps:

[0015] Obtain the force model of the slewing bearing;

[0016] Based on the force model, the target output force of each of the loading hydraulic cylinders is obtained;

[0017] Each of the loading hydraulic cylinders is driven to output the corresponding target output force.

[0018] The technical solution of this invention configures a bending moment loading device comprising a fixed support and multiple loading hydraulic cylinders. The fixed support is used to fix one of the inner and outer rings, and the loading hydraulic cylinders are arranged at intervals along the circumferential direction of the slewing bearing. Projection along the axis of rotation is made such that the projection of the other of the inner and outer rings at least partially covers the loading hydraulic cylinders, which apply force to the other of the inner and outer rings. When the slewing bearing needs to be checked, multiple forces can be applied to the inner or outer rings throughout the entire circumference by the multiple loading hydraulic cylinders, forming a sinusoidal load distribution to simulate the bending moment borne by the slewing bearing. Compared with simulation testing, this bending moment loading device reduces uncontrollable factors, improves testing accuracy, and is beneficial for improving the accuracy of slewing bearing verification. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an embodiment of the bending moment loading device of the present invention.

[0021] Figure 2 This is a top view of an embodiment of the bending moment loading device of the present invention.

[0022] Figure 3 This is a bottom view of an embodiment of the bending moment loading device of the present invention.

[0023] Figure 4 This is a schematic diagram of another embodiment of the bending moment loading device of the present invention.

[0024] Figure 5 This is a schematic diagram of a slewing bearing corresponding to an embodiment of the bending moment loading device of the present invention.

[0025] Figure 6This is a schematic diagram of another embodiment of the bending moment loading device of the present invention.

[0026] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.

[0027] Explanation of icon numbers:

[0028]

[0029] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] Conducting simulation tests and benchmarking for slewing bearings is difficult due to numerous uncontrollable factors, often resulting in significant discrepancies between simulation and test data, and the accuracy of the verification needs to be improved.

[0034] In view of this, the present invention proposes a bending moment loading device to improve the accuracy of the verification.

[0035] Reference Figure 1 In one embodiment of the present invention, the bending moment loading device is used for a slewing bearing 100, wherein the slewing bearing 100 can be a four-point contact ball bearing, a three-row column bearing, or a sliding bearing, etc. The slewing bearing 100 is used in nuclear power plant fixtures, such as slewing fixtures applied to steam generators, which are used to allow the steam generator in a nuclear power plant to rotate horizontally during installation and other processes. Typically, the steam generator in a nuclear power plant is approximately 24 meters long and weighs approximately 800 tons; therefore, it is necessary to verify the slewing bearing 100 in the aforementioned slewing fixtures. According to standard JB / T2300-2011, the corresponding slewing bearing 100 includes an inner ring 110 and an outer ring 120 that can rotate relative to each other around a rotation axis. The inner ring 110 has an inner mounting through hole 111 extending along the height direction, and the outer ring 120 has an outer mounting through hole 121 extending along the height direction.

[0036] The bending moment loading device includes a fixed bracket 210 and multiple loading hydraulic cylinders 220. The fixed bracket 210 is used to fix the inner ring 110, specifically by using the inner mounting through hole 111 of the inner ring 110. The loading hydraulic cylinders 220 are arranged at intervals along the circumferential direction of the slewing bearing 100. Projecting along the axis of rotation, the projection of the outer ring 120 at least partially covers the loading hydraulic cylinders 220, which are used to apply force to the outer ring 120. Of course, the fixed bracket 210 can also be used to fix the outer ring 120, specifically by using the outer mounting through hole 121 of the outer ring 120; the projection of the inner ring 110 at least partially covers the loading hydraulic cylinders 220, which are used to apply force to the inner ring 110. This embodiment does not limit this. It can be understood that in this moment loading device, the fixed bracket 210 is used to fix one of the inner ring 110 and the outer ring 120, and the projection of the other of the inner ring 110 and the outer ring 120 at least partially covers the loading hydraulic cylinder 220, which is used to apply force to the other of the inner ring 110 and the outer ring 120.

[0037] In this embodiment, when the slewing bearing 100 needs to be checked, multiple loading hydraulic cylinders 220 can apply multiple forces to the inner ring 110 or the outer ring 120 throughout the entire circumference to form a sinusoidal load distribution, thereby simulating the bending moment borne by the slewing bearing 100. Compared with simulation testing, this bending moment loading device reduces uncontrollable factors, improves test accuracy, and helps to improve the verification accuracy of the slewing bearing 100.

[0038] Furthermore, for equipment such as steam generators with a total length of approximately 24 meters and a weight of approximately 800 tons, this type of slewing bearing 100 is typically large in size. Since the projection of the other of the inner ring 110 and outer ring 120 at least partially covers the loading hydraulic cylinder 220, the moment loading device can save on the connection structure between the loading hydraulic cylinder 220 and the slewing bearing 100 in the radial direction, reducing the interference of the self-weight of the connection structure in the radial direction on the simulated load applied by the loading hydraulic cylinder 220. The force distribution is closer to the actual working condition, which is beneficial to further improve the verification accuracy. Due to the reduction of the connection structure in the radial direction, the moment loading device reduces the load transmission components and improves the loading efficiency. In addition, the floor space of the moment loading device is also reduced.

[0039] In some implementations, refer to Figure 1 The bending moment loading device also includes a support ring 230, the axial end face of which is fixedly connected to the axial end face of the outer ring 120. The maximum force of the loading hydraulic cylinder 220 is greater than or equal to 10 tons and less than or equal to 100 tons. The loading hydraulic cylinder 220 is used to abut against the support ring 230 and apply force to the outer ring 120 through the support ring 230. Alternatively, the axial end face of the support ring 230 can be fixedly connected to the axial end face of the inner ring 110, and the loading hydraulic cylinder 220 can be used to abut against the support ring 230 and apply force to the inner ring 110 through the support ring 230. This embodiment does not limit this. It can be understood that the axial end face of the support ring 230 is fixedly connected to the axial end face of the inner ring 110 or the axial end face of the outer ring 120, and the loading hydraulic cylinder 220 is used to abut against the support ring 230 and apply force to the corresponding inner ring 110 or outer ring 120 through the support ring 230. In this embodiment, in order to simulate real working conditions, the force of the loading hydraulic cylinder 220 is usually large, for example, the maximum force of the loading hydraulic cylinder 220 is greater than or equal to 10 tons and less than or equal to 100 tons; by setting the support ring 230, the multiple single-point forces formed by the multiple loading hydraulic cylinders 220 arranged at intervals can be applied to the inner ring 110 or the outer ring 120 more evenly through the support ring 230, reducing the risk of damage to the slewing bearing 100 caused by the large force of the loading hydraulic cylinder 220.

[0040] In some implementations, reference continues. Figure 1The support ring 230 has a first threaded hole 231 on its axial end face. The bending moment loading device also includes a connecting rod 241 and a nut 242. Both ends of the connecting rod 241 are provided with external threads, for example, the connecting rod 241 can be set as a double-ended stud. One end of the connecting rod 241 passes through the external mounting through hole 121 and is threadedly connected to the first threaded hole 231. The nut 242 is threadedly connected to the other end of the connecting rod 241 and abuts against the outer ring 120, so as to achieve a fixed connection between the axial end face of the support ring 230 and the axial end face of the outer ring 120. Of course, one end of the connecting rod 241 can also pass through the internal mounting through hole 111 and be threadedly connected to the first threaded hole 231. The nut 242 is threadedly connected to the other end of the connecting rod 241 and abuts against the corresponding inner ring 110, so as to achieve a fixed connection between the axial end face of the support ring 230 and the axial end face of the inner ring 110. This can be understood as follows: one end of the connecting rod 241 passes through the inner mounting through hole 111 or the outer mounting through hole 121 and is threadedly connected to the first threaded hole 231; the nut 242 is threadedly connected to the other end of the connecting rod 241 and abuts against the corresponding inner ring 110 or outer ring 120. In this embodiment, after the threaded connection between the nut 242 and the connecting rod 241 and the threaded connection between the connecting rod 241 and the first threaded hole 231 of the support ring 230 are released, the inner ring 110 and the outer ring 120 can rotate relative to each other to change the relative positional relationship between the outer ring 120 and the multiple loading hydraulic cylinders 220 that apply different forces; thus, when the bending moment loading device performs multi-positional checks on the slewing bearing 100, it can improve the switching efficiency between each position, and through the connecting rod 241 and the nut 242, the inner ring 110 and the outer ring 120 remain stable under large forces during the check process.

[0041] In some implementations, refer to Figure 1 and Figure 2 The bending moment loading device also includes a base plate 250, and a fixed bracket 210 is fixedly connected to the base plate 250, for example, by welding or bolting. Alternatively, the bending moment loading device may not have a base plate 250; for example, the fixed bracket 210 and the loading hydraulic cylinder 220 can be fixed to or placed on the ground. The fixed bracket 210 may include multiple columns 211 and multiple connecting plates 212 arranged sequentially along the circumferential direction of the slewing bearing 100. The connecting plates 212 can be understood as a separate design. The columns 211 are spaced apart along the circumferential direction of the slewing bearing 100, and the connecting plates 212 are fixedly connected to the columns 211 one-to-one, for example, by bolting or welding. The columns 211 can be supports. Furthermore, the columns 211 can be segmented, for example, by stacking multiple supports, to accommodate slewing bearings 100 with different axial dimensions, improving the applicability of the bending moment loading device. (Refer to...) Figure 1The surface of the connecting plate 212 is fixedly connected to the axial end face of the inner ring 110, and the column 211 is spaced apart from the inner ring 110. Alternatively, the surface of the connecting plate 212 can be fixedly connected to the axial end face of the outer ring 120, and the column 211 can be spaced apart from the outer ring 120; this embodiment does not limit this. It can be understood that the surface of the connecting plate 212 is fixedly connected to the axial end face of either the inner ring 110 or the outer ring 120, and the column 211 is spaced apart from the corresponding inner ring 110 or outer ring 120. In this embodiment, the fixed bracket 210 includes a plurality of connecting plates 212 arranged sequentially along the circumferential direction of the slewing bearing 100. The cumulative flatness error of each connecting plate 212 is small, which can reduce the connection stress between the inner ring 110 or the outer ring 120 and the connecting plate 212 after the connecting plate 212 is fixedly connected to the axial end face of one of the inner ring 110 and the outer ring 120. The stress distribution of the inner ring 110 or the outer ring 120 is closer to the actual working condition, which is beneficial to further improve the verification accuracy.

[0042] In some implementations, refer to Figure 1 and Figure 3 ,in Figure 3 A bottom view of the bending moment loading device in this embodiment is shown. Part of the loading hydraulic cylinder 220 is configured as a tension hydraulic cylinder 221, such as a plunger-type hydraulic cylinder; the other part of the loading hydraulic cylinder 220 is configured as a thrust hydraulic cylinder 222, such as a hollow plunger-type hydraulic cylinder. Projected along the axis of rotation, the projection of the outer ring 120 includes a first semi-circular portion and a second semi-circular portion. The projection of the tension hydraulic cylinders 221 is at least partially within the first semi-circular portion, and the tension hydraulic cylinders 221 are spaced apart along the circumferential direction of the first semi-circular portion. The projection of the thrust hydraulic cylinders 222 is at least partially within the second semi-circular portion, and the thrust hydraulic cylinders 222 are spaced apart along the circumferential direction of the second semi-circular portion. Of course, the projection of the inner ring 110 may also include the aforementioned first and second semi-circular portions; this embodiment does not limit this. This can be understood as follows: the projection of one of the inner ring 110 and the outer ring 120 includes a first semi-ring portion and a second semi-ring portion. The projection of the tension hydraulic cylinder 221 is at least partially within the first semi-ring portion, and the tension hydraulic cylinders 221 are spaced apart along the circumferential direction of the first semi-ring portion. The projection of the thrust hydraulic cylinder 222 is at least partially within the second semi-ring portion, and the thrust hydraulic cylinders 222 are spaced apart along the circumferential direction of the second semi-ring portion. In this embodiment, in order to form a sinusoidal load distribution, the tension hydraulic cylinders 221 corresponding to the first semi-ring portion and the thrust hydraulic cylinders 222 corresponding to the second semi-ring portion can form a relatively simple force distribution pattern, for example... Figure 3The tension hydraulic cylinder 221 facing right has a greater tension, and the thrust hydraulic cylinder 222 facing left has a greater thrust. This reduces the need to switch between the tension hydraulic cylinder 221 and the thrust hydraulic cylinder 222, making the load applied by the moment loading device more stable and accurate. When it is necessary to check the slewing bearing 100 in multiple directions, the threaded connection between the nut 242 and the connecting rod 241, and the threaded connection between the connecting rod 241 and the first threaded hole 231 of the support ring 230 can be released. After the inner ring 110 and the outer ring 120 can rotate relative to each other and are then re-fixed, the check can be performed.

[0043] Among them, reference Figure 1 The thrust hydraulic cylinder 222 can be disposed between the base plate 250 and the slewing bearing 100. Furthermore, the base plate 250 has a through structure 251, which can be configured as a through hole, etc. The cylinder body of the tension hydraulic cylinder 221 is fixedly connected to the side of the base plate 250 facing away from the slewing bearing 100, for example, by bolt connection, snap-fit ​​connection, etc. The axial end face of the support ring 230 facing away from the slewing bearing 100 has a second threaded hole 232. The output end of the tension hydraulic cylinder 221 has a threaded rod 223, which passes through the through structure 251 and is threadedly connected to the second threaded hole 232, thereby applying tension to the support ring 230 and the corresponding outer ring 120 (or inner ring 110). In this embodiment, the placement and connection relationship of the thrust hydraulic cylinder 222 and the tension hydraulic cylinder 221 improve the structural compactness of the moment loading device and reduce the space occupied by the moment loading device.

[0044] Reference Figure 3 Multiple rows of through structures 251 can be provided on the base plate 250. The through structures 251 in the same row are arranged at intervals on the preset arc 252, and the through structures 251 in adjacent rows are arranged at intervals, so that the bending moment loading device can adapt to slewing bearings 100 of different diameters and improve the applicability of the bending moment loading device.

[0045] Reference Figure 4In another embodiment, the fixing bracket 210 includes a first ring plate 213 and a second ring plate 214. The thickness direction of the first ring plate 213 is perpendicular to the thickness direction of the second ring plate 214. This can be understood as the cross-sections of both the first ring plate 213 and the second ring plate 214 forming an inverted T-shape. The axial end face of the first ring plate 213 is fixedly connected to the surface of the second ring plate 214. The first ring plate 213 and the second ring plate 214 can be integrally formed by machining to reduce deformation caused by assembly processes such as welding, and to improve the flatness of the axial end face of the first ring plate 213 facing away from the second ring plate 214. Alternatively, the first ring plate 213 and the second ring plate 214 can be manufactured separately and then fixedly connected by welding or other methods to reduce the raw material cost of the first ring plate 213 and the second ring plate 214 (compared to machining and material removal to form the first ring plate 213 and the second ring plate 214). The axial end face of the first ring plate 213 is fixedly connected to the plate surface of the second ring plate 214, which makes the overall integrity of the fixed bracket 210 higher and the structure more concentrated, reducing the assembly time of the bending moment loading device and improving the verification efficiency.

[0046] In this embodiment, the axial end face of the first ring plate 213 is fixedly connected to the axial end face of the inner ring 110. The second ring plate 214 includes a connecting portion 215, which extends out of the first ring plate 213 in the direction toward the outer ring 120. The loading hydraulic cylinder 220 is connected to the connecting portion 215. The outer peripheral wall of the first ring plate 213 is spaced apart from the inner peripheral wall of the outer ring 120. Alternatively, the axial end face of the first ring plate 213 can be fixedly connected to the axial end face of the outer ring 120, and the second ring plate 214 can include a connecting portion 215, which extends out of the first ring plate 213 in the direction toward the inner ring 110. The loading hydraulic cylinder 220 is connected to the connecting portion 215. The inner peripheral wall of the first ring plate 213 is spaced apart from the outer peripheral wall of the inner ring 110. This embodiment does not limit this configuration. This can be understood as follows: the axial end face of the first ring plate 213 is fixedly connected to the axial end face of the inner ring 110 or the outer ring 120, and the connecting portion 215 extends out of the first ring plate 213 in the direction toward the other of the inner ring 110 and the outer ring 120; when the axial end face of the first ring plate 213 is fixedly connected to the axial end face of the inner ring 110, the outer peripheral wall of the first ring plate 213 is spaced apart from the inner peripheral wall of the outer ring 120; or when the axial end face of the first ring plate 213 is fixedly connected to the axial end face of the outer ring 120, the inner peripheral wall of the first ring plate 213 is spaced apart from the outer peripheral wall of the inner ring 110.

[0047] In the partial slewing bearing 100, there is a certain height difference between the inner ring 110 and the outer ring 120. In this embodiment, the outer peripheral wall of the first ring plate 213 is spaced apart from the inner peripheral wall of the outer ring 120, or the inner peripheral wall of the first ring plate 213 is spaced apart from the outer peripheral wall of the inner ring 110. This reduces the risk of the outer ring 120 or the inner ring 110 being squeezed against the first ring plate 213 after the outer ring 120 or the inner ring 110 tilts or deforms under the overturning moment. This allows the inner ring 110 and the outer ring 120 to rotate relative to each other more quickly to form different detection orientations, thereby improving the overall efficiency of the bending moment loading device in loading multiple orientations.

[0048] Continue to refer to Figure 4 The first ring plate 213 and the support ring 230 can be disposed on the same side of the slewing bearing 100. When the axial end face of the first ring plate 213 is fixedly connected to the axial end face of the inner ring 110, the outer peripheral wall of the first ring plate 213 is spaced apart from the inner peripheral wall of the support ring 230; or when the axial end face of the first ring plate 213 is fixedly connected to the axial end face of the outer ring 120, the inner peripheral wall of the first ring plate 213 is spaced apart from the outer peripheral wall of the support ring 230. In this embodiment, after the support ring 230 tilts or deforms under the overturning moment, the risk of the support ring 230 pressing against the first ring plate 213 can be reduced, allowing the support ring 230 to rotate more quickly so that the inner ring 110 and the outer ring 120 form different detection orientations, thereby improving the overall efficiency of the bending moment loading device in loading multiple orientations.

[0049] Reference Figure 4 The thrust hydraulic cylinder 222 can be disposed between the connecting portion 215 and the slewing bearing 100. Furthermore, the connecting portion 215 has a through structure, which can be a through hole or the like. The cylinder body of the tension hydraulic cylinder 221 is fixedly connected to the side of the connecting portion 215 facing away from the slewing bearing 100, for example, by bolt connection or snap-fit ​​connection. The axial end face of the support ring 230 facing away from the slewing bearing 100 has a threaded hole, and the output end of the tension hydraulic cylinder 221 has a threaded rod. The threaded rod passes through the through structure and is threadedly connected to the threaded hole, thereby applying tension to the support ring 230 and the corresponding outer ring 120 (or inner ring 110). In this embodiment, the placement and connection relationship of the thrust hydraulic cylinder 222 and the tension hydraulic cylinder 221 improve the structural compactness of the moment loading device and reduce the space occupied by the moment loading device.

[0050] Some slewing bearings 100 are not perfectly symmetrical, for example, when a drive belt 124 is used to drive the slewing bearing 100 with the outer ring 120. Specifically, refer to... Figure 5The outer circumferential wall of the outer ring 120 is provided with a mounting notch 122, which can be understood as a structure that is recessed relative to the theoretical circle. A clamping device 123 is provided on the mounting notch 122, which is used to clamp the end of the drive belt 124. The clamping device 123 can be configured to include a toothed plate and a toothed seat, which can be used to clamp the end of the drive belt 124. For this type of not-completely-symmetrical slewing bearing 100, it is usually necessary to check different positions in the circumferential direction.

[0051] In some embodiments, the loading hydraulic cylinder 220 is configured as a thrust hydraulic cylinder 222. (See reference...) Figure 6 The bending moment loading device also includes a washer 260, which is disposed between the axial end face of the outer ring 120 and the thrust hydraulic cylinder 222. One side of the washer 260 abuts against the axial end face of the outer ring 120, and the other side of the washer 260 abuts against the thrust hydraulic cylinder 222. Alternatively, the washer 260 can be disposed between the axial end face of the inner ring 110 and the thrust hydraulic cylinder 222, with one side of the washer 260 abutting against the axial end face of the inner ring 110 and the other side of the washer 260 abutting against the thrust hydraulic cylinder 222. In other words, the washer 260 is disposed between the axial end face of the inner ring 110 or the axial end face of the outer ring 120 and the thrust hydraulic cylinder 222, with one side of the washer 260 abutting against the axial end face of the inner ring 110 or the axial end face of the outer ring 120, and the other side of the washer 260 abutting against the thrust hydraulic cylinder 222. Of course, referring to… Figure 6 When the support ring 230 is provided, a washer ring 260 can be further provided between the axial end face of the support ring 230 and the thrust hydraulic cylinder 222. One side of the washer ring 260 abuts against the axial end face of the support ring 230, and the other side of the washer ring 260 abuts against the thrust hydraulic cylinder 222.

[0052] In this embodiment, the bending moment loading device also includes a washer ring 260, which allows the outer ring 120 or the inner ring 110 to rotate relative to the thrust hydraulic cylinder 222 without being scratched by the output end of the thrust hydraulic cylinder 222. The inner ring 110 and the outer ring 120 can rotate relative to each other more quickly to form different detection orientations, thereby improving the overall efficiency of the bending moment loading device in loading multiple orientations.

[0053] The washer ring 260 may have an annular groove 261 on the side facing the thrust hydraulic cylinder 222. The extension direction of the annular groove 261 is consistent with the arrangement direction of the loading hydraulic cylinder 220. The output end of the thrust hydraulic cylinder 222 extends into the annular groove 261, which reduces the risk of the washer ring 260 moving radially and detaching from the thrust hydraulic cylinder 222, enabling the washer ring 260 to transfer the load more effectively and improving the accuracy of the verification.

[0054] In some embodiments, the loading hydraulic cylinder 220 includes an inlet, an outlet, and an adjusting valve. The inlet and outlet are used to connect to hydraulic lines. The loading hydraulic cylinder 220 also includes a pressure sensor for detecting the output force; the pressure sensor outputs the detected pressure value, and the adjusting valve adjusts the output force of the loading hydraulic cylinder 220. In this embodiment, the loading hydraulic cylinder 220 can be pressurized through a hydraulic pump and hydraulic lines from the inlet and outlet. The pressure of the loading hydraulic cylinder 220 can be measured by the pressure sensor. When the pressure reaches the design pressure, the adjusting valve can be closed manually or electrically, thereby adjusting the output force of the loading hydraulic cylinder 220 to make the output condition of the bending moment loading device closer to the actual working condition.

[0055] In some implementations, refer to Figure 4 or Figure 6 The first ring plate 213 includes a first ring segment 2131 and a second ring segment 2132. The second ring segment 2132 is fixedly connected to the second ring plate 214. The first ring segment 2131 and the second ring segment 2132 can be integrally formed by machining. The first ring segment 2131 is located on the side of the second ring segment 2132 facing away from the second ring plate 214, and the first ring segment 2131 is fixedly connected to the axial end face of the inner ring 110 or the outer ring 120. The diameter of the outer peripheral wall of the second ring segment 2132 is smaller than the diameter of the outer peripheral wall of the first ring segment 2131. This allows the second ring segment 2132 to form a larger gap with the inner peripheral wall of the inner ring 110 or the support ring 230 when the first ring plate 213 is located inside the inner ring 110 or the support ring 230. After the inner ring 110 or the support ring 230 tilts or deforms under the overturning moment, the risk of the inner ring 110 or the support ring 230 being squeezed by the first ring plate 213 is reduced. This also allows the inner ring 110 and the outer ring 120 to rotate relative to each other more quickly to form different detection orientations, thus improving the overall efficiency of the bending moment loading device in loading multiple orientations.

[0056] Furthermore, the diameter of the inner circumferential wall of the second ring segment 2132 can be made larger than the diameter of the inner circumferential wall of the first ring segment 2131. This allows the second ring segment 2132 to form a larger gap with the outer circumferential wall of the outer ring 120 or the support ring 230 when the first ring plate 213 is located outside the outer ring 120 or the support ring 230. After the outer ring 120 or the support ring 230 tilts or deforms under the overturning moment, the risk of the outer ring 120 or the support ring 230 being squeezed by the first ring plate 213 can be reduced. This also allows the inner ring 110 and the outer ring 120 to rotate relative to each other more quickly to form different detection orientations, thus improving the overall efficiency of the bending moment loading device in loading multiple orientations.

[0057] In some alternative embodiments, some of the loading hydraulic cylinders 220 are configured as tension hydraulic cylinders 221, and others are configured as thrust hydraulic cylinders 222. Along the circumferential direction of the slewing bearing 100, a thrust hydraulic cylinder 222 is provided between any two adjacent tension hydraulic cylinders 221, which can be understood as an alternating arrangement of tension hydraulic cylinders 221 and thrust hydraulic cylinders 222. In this embodiment, the tension hydraulic cylinders 221 within the first semicircle can stop outputting, while the tension hydraulic cylinders 221 within the second semicircle output different forces according to a preset force model; and the thrust hydraulic cylinders 222 within the first semicircle output different forces according to a preset force model, while the thrust hydraulic cylinders 222 within the second semicircle stop outputting, thereby achieving a check load applied to a specific orientation. By changing the positions of the first and second semicircular ranges, it can be understood as changing the output forces of different tension hydraulic cylinders 221 and thrust hydraulic cylinders 222. The bending moment loading device can quickly complete the verification of different positions in the circumferential direction.

[0058] This invention also proposes a detection system, which includes a detection component and the aforementioned bending moment loading device. The detection component is used to detect the stress or strain of the slewing bearing 100. The detection component can be used to test the preload of the connecting bolts between the inner ring 110 and the outer ring 120 (e.g., the preload formed by the nut 242 and the connecting rod 241), the surface stress of the inner ring 110 or the outer ring 120, and the deformation of the inner ring 110 or the outer ring 120. The bolt preload can be measured using an ultrasonic device, the surface stress can be measured using a strain gauge, and the deformation of the inner ring 110 or the outer ring 120 can be measured using a laser rangefinder sensor. This embodiment does not limit the scope of the measurement.

[0059] In some embodiments, the detection assembly includes a mounting ring and a plurality of strain gauges disposed on the mounting ring. The mounting ring is located inside the inner ring 110 or outside the outer ring 120. The strain gauges are disposed on the side of the mounting ring facing the inner ring 110 and in contact with the inner ring 110, or the strain gauges are disposed on the side facing the outer ring 120 and in contact with the outer ring 120. When the inner ring 110 and the outer ring 120 need to rotate relative to each other to change the calibration orientation, the plurality of strain gauges disposed on the mounting ring can change their positions as a whole and quickly as the mounting ring moves, improving the overall efficiency of multi-directional calibration.

[0060] The present invention also proposes a bending moment loading method, which is applied to the above-mentioned bending moment loading device. The bending moment loading method includes the following steps:

[0061] Obtain the force model of the slewing bearing 100, wherein the force model may include force distribution information along the circumferential direction and position information relative to the inner ring 110 or the outer ring 120.

[0062] Based on the force model, the target output force of each loading hydraulic cylinder 220 is obtained; this step may specifically include converting the force distribution information along the circumferential direction into the target output force of the loading hydraulic cylinder 220.

[0063] Driving each loading hydraulic cylinder 220 to output the corresponding target output force can be understood as driving each loading hydraulic cylinder 220 to perform actions according to the target output force. When the loading hydraulic cylinder 220 also includes the aforementioned pressure sensor for detecting the output force, after the step of driving each loading hydraulic cylinder 220 to output the corresponding target output force, the actual output force of the loading hydraulic cylinder 220 can be adjusted based on the pressure detection value of the pressure sensor, for example, through the aforementioned adjusting valve.

[0064] Among them, reference Figures 1 to 3 If the projection of one of the inner ring 110 and the outer ring 120 includes a first semi-ring portion and a second semi-ring portion, the projection of the tension hydraulic cylinder 221 is at least partially within the first semi-ring portion and the tension hydraulic cylinders 221 are spaced apart along the circumferential direction of the first semi-ring portion, and the projection of the thrust hydraulic cylinder 222 is at least partially within the second semi-ring portion and the thrust hydraulic cylinders 222 are spaced apart along the circumferential direction of the second semi-ring portion, the bending moment loading method further includes the following step: determining the position of the first semi-ring portion corresponding to the tension hydraulic cylinder 221 and the position of the second semi-ring portion corresponding to the thrust hydraulic cylinder 222 based on the position information relative to the inner ring 110 or the outer ring 120 included in the force model. For example, refer to... Figure 3 When verification is required in the left and right directions, the first half-ring is placed on the left and the second half-ring is placed on the right.

[0065] When all loading hydraulic cylinders 220 are configured as thrust hydraulic cylinders 222 or tension hydraulic cylinders 221; or when, along the circumferential direction of the slewing bearing 100, any two adjacent tension hydraulic cylinders 221 are provided with thrust hydraulic cylinders 222 (which can be understood as tension hydraulic cylinders 221 and thrust hydraulic cylinders 222 being staggered), the above-mentioned step of obtaining the target output force of each loading hydraulic cylinder 220 according to the force model further includes changing the output force of each loading hydraulic cylinder 220 according to the circumferential force distribution information included in the force model and the position information relative to the inner ring 110 or outer ring 120.

[0066] It is understood that the specific structure of the bending moment loading device refers to the above embodiments. Since the above detection system and bending moment loading method adopt all the technical solutions of all the above embodiments, they have at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0067] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A bending moment loading device, characterized in that, The bending moment loading device is used for a slewing bearing, which is used for nuclear power plant fixtures. The slewing bearing includes an inner ring and an outer ring that can rotate relative to each other about a rotation axis. The bending moment loading device includes a fixed bracket and a plurality of loading hydraulic cylinders. The fixed bracket is used to fix one of the inner ring and the outer ring. The loading hydraulic cylinders are arranged at intervals along the circumferential direction of the slewing bearing. When projected along the axis of rotation, the projection of the other of the inner ring and the outer ring at least partially covers the loading hydraulic cylinder. The loading hydraulic cylinder is used to apply a force to the other of the inner ring and the outer ring. The bending moment loading device further includes a support ring, the axial end face of which is fixedly connected to the axial end face of the inner ring or the axial end face of the outer ring; the maximum force of the loading hydraulic cylinder is greater than or equal to 10 tons and less than or equal to 100 tons, and the loading hydraulic cylinder is used to abut against the support ring and apply force to the corresponding inner ring or outer ring through the support ring; The inner ring has an inner mounting through hole extending along the height direction, and the outer ring has an outer mounting through hole extending along the height direction; the axial end face of the support ring has a first threaded hole, and the bending moment loading device also includes a connecting rod and a nut, both ends of the connecting rod having external threads; one end of the connecting rod passes through the inner mounting through hole or the outer mounting through hole and is threadedly connected to the first threaded hole, and the nut is threadedly connected to the other end of the connecting rod and abuts against the corresponding inner ring or the outer ring; Some of the loading hydraulic cylinders are configured as tension hydraulic cylinders, and others are configured as thrust hydraulic cylinders. Projected along the axis of rotation, the projection of one of the inner and outer rings includes a first semi-circular portion and a second semi-circular portion. The projection of the tension hydraulic cylinder is at least partially within the first semi-circular portion, and the tension hydraulic cylinders are spaced apart along the circumferential direction of the first semi-circular portion. The projection of the thrust hydraulic cylinder is at least partially within the second semi-circular portion, and the thrust hydraulic cylinders are spaced apart along the circumferential direction of the second semi-circular portion. The bending moment loading device also includes a base plate, the fixed bracket is fixedly connected to the base plate, and the thrust hydraulic cylinder is disposed between the base plate and the slewing bearing; the base plate is provided with a through structure, and the cylinder body of the tension hydraulic cylinder is fixedly connected to the side of the base plate facing away from the slewing bearing; the axial end face of the support ring facing away from the slewing bearing is provided with a second threaded hole, and the output end of the tension hydraulic cylinder is provided with a threaded rod, which passes through the through structure and is threadedly connected to the second threaded hole.

2. The bending moment loading device as described in claim 1, characterized in that, The fixed support includes multiple columns and multiple connecting plates arranged sequentially along the circumferential direction of the slewing bearing. The columns are spaced apart along the circumferential direction of the slewing bearing, and the connecting plates are fixedly connected to the columns one-to-one. The surface of the connecting plate is fixedly connected to the axial end face of one of the inner ring and the outer ring. The columns are spaced apart from the corresponding inner ring or outer ring; and / or, The base plate is provided with multiple rows of through structures, the through structures in the same row are arranged at intervals on a preset arc, and the through structures in adjacent rows are spaced apart.

3. The bending moment loading device as described in claim 1, characterized in that, The fixed bracket includes a first ring plate and a second ring plate. The thickness direction of the first ring plate is perpendicular to the thickness direction of the second ring plate. The axial end face of the first ring plate is fixedly connected to the surface of the second ring plate. The axial end face of the first ring plate is fixedly connected to the axial end face of the inner ring or the outer ring. The second ring plate includes a connecting portion. The connecting portion extends out of the first ring plate in a direction toward the other of the inner ring and the outer ring. The loading hydraulic cylinder is connected to the connecting portion. When the axial end face of the first ring plate is fixedly connected to the axial end face of the inner ring, the outer peripheral wall of the first ring plate is spaced apart from the inner peripheral wall of the outer ring; or when the axial end face of the first ring plate is fixedly connected to the axial end face of the outer ring, the inner peripheral wall of the first ring plate is spaced apart from the outer peripheral wall of the inner ring; and / or, The first ring plate and the support ring are disposed on the same side of the slewing bearing. When the axial end face of the first ring plate is fixedly connected to the axial end face of the inner ring, the outer peripheral wall of the first ring plate is spaced apart from the inner peripheral wall of the support ring; or when the axial end face of the first ring plate is fixedly connected to the axial end face of the outer ring, the inner peripheral wall of the first ring plate is spaced apart from the outer peripheral wall of the support ring.

4. The bending moment loading device as described in claim 1, characterized in that, All loading hydraulic cylinders are configured as thrust hydraulic cylinders; the bending moment loading device further includes a washer ring, which is disposed between the axial end face of the inner ring or the axial end face of the outer ring and the thrust hydraulic cylinder, with one side of the washer ring abutting against the axial end face of the inner ring or the axial end face of the outer ring, and the other side of the washer ring abutting against the thrust hydraulic cylinder; and / or, The loading hydraulic cylinder includes an inlet, an outlet, and an adjusting valve. The inlet and outlet are used to connect to hydraulic pipelines. The loading hydraulic cylinder also includes a pressure sensor for detecting the output force; the pressure sensor outputs a pressure detection value, and the adjusting valve adjusts the output force of the loading hydraulic cylinder; and / or... Along the circumferential direction of the slewing bearing, a thrust hydraulic cylinder is provided between any two adjacent tension hydraulic cylinders.

5. A detection system, characterized in that, The detection system includes a detection component and a moment loading device as described in any one of claims 1 to 4, wherein the detection component is used to detect the stress or strain of the slewing bearing.

6. The detection system as described in claim 5, characterized in that, The detection assembly includes a mounting ring and a plurality of strain gauges disposed on the mounting ring. The mounting ring is disposed on the inner side of the inner ring or the outer side of the outer ring. The strain gauges are disposed on the side of the mounting ring facing the inner ring and are in contact with the inner ring, or the strain gauges are disposed on the side facing the outer ring and are in contact with the outer ring.

7. A bending moment loading method, characterized in that, The bending moment loading method is applied to the bending moment loading device as described in any one of claims 1 to 4, and the bending moment loading method includes the following steps: Obtain the force model of the slewing bearing; Based on the force model, the target output force of each of the loading hydraulic cylinders is obtained; Each of the loading hydraulic cylinders is driven to output the corresponding target output force.

Images