Aviation bearing elastic support rigidity measuring device

Abstract

The invention discloses a device for measuring the elastic support rigidity of an aviation bearing. The device comprises a test bed, a mounting seat assembly, a pressing and fixing device, a stepless loading device and a displacement detection device. A mounting surface is arranged on the mounting seat assembly, and the pressing and fixing device is adjustably connected with the mounting surface so as to press the mounting edge at multiple positions in the circumferential direction, so that the mounting edge is tightly attached to the mounting surface to further fix the bearing elastic support, and the fixing requirements of the bearing elastic supports with different outer diameters are met. And the loading end of the stepless loading device is fixed with the mounting end of the bearing elastic support, and the connecting end of the stepless loading device is connected with the test bed so as to apply a vertical stepless load to the mounting end of the bearing elastic support and display the magnitude of the loading force. And the displacement detection device is connected to the mounting seat assembly and is used for displaying the displacement of the bearing elastic support mounting end along the loading direction after the bearing elastic support mounting end is subjected to the action of the loading force. The measuring device can adapt to fixing of the bearing elastic support within a certain outer diameter range, meanwhile, stepless application of loads can be carried out, and the loading range of the loads is wide, continuous and adjustable.

Description

Technical Field

[0001] The invention relates to the technical field of aeroengines, and in particular to a device for measuring the elastic support stiffness of an aero bearing. Background Art

[0002] The elastic bearing support structure (abbreviated as bearing elastic support) is as follows Figure 1 As shown, it is commonly used in the field of aeroengines to provide a support with a suitable stiffness value for the rotor bearing. Its radial stiffness is called elastic stiffness, which is the ratio of the change in radial load to the change in displacement of the free end of the elastic support along the loading direction caused by it.

[0003] At present, in the common bearing spring support stiffness measurement device, the bearing spring support mounting edge is fixed by the adapter plate, the loading lock body is locked in the bearing mounting position at the front end of the bearing spring support, and the loading lock body is also connected to the weight tray. During the measurement, while adding weights, the displacement change of the measuring plane on the loading lock body is recorded. According to the definition of spring support stiffness, the ratio of the load change of the weight to the displacement change of the measuring plane is the spring support stiffness.

[0004] Existing spring-loaded support stiffness measurement devices have two main disadvantages: first, the installation fixture (adapter plate, loading lock body) is not universal, and the bearing spring-loaded support test piece needs to be redesigned and processed when the size changes, which not only has a long cycle and low efficiency but also wastes resources; second, the number of weights that can be placed is limited, and the upper limit of the applied load is low. When the stiffness of the bearing spring to be tested is large, the deformation is too small and the displacement test error is large, which leads to low accuracy of the stiffness test results. Summary of the invention

[0005] The present invention provides an aviation bearing spring support stiffness measuring device to solve the technical problem that the existing measuring device needs to be redesigned and processed when the size of the bearing spring support test piece changes, which not only has a long cycle, low efficiency and wastes resources, but also has a low upper limit of applied load. When the stiffness of the bearing spring support to be measured is large, the deformation is too small and the displacement test error is large, which leads to low accuracy of the stiffness test result.

[0006] The technical solution adopted by the present invention is as follows: A device for measuring the stiffness of an aviation bearing spring support comprises: a test bench, a mounting seat assembly mounted on the test bench, a clamping and fixing device, a stepless loading device and a displacement detection device; a vertical mounting surface is provided on the mounting seat assembly, and the clamping and fixing device is adjustably connected to the mounting surface, so as to be used for clamping the mounting edge at multiple locations along the circumference of the mounting edge of the end of the bearing spring support, so that the mounting edge is close to the mounting surface and thus fixes the bearing spring support, and adapts to the fixing requirements of bearing spring supports of different outer diameters; the loading end of the stepless loading device is fixed to the mounting end of the bearing spring support for mounting the bearing, and the opposite connecting end of the stepless loading device is connected to the test bench, so as to apply a vertical stepless load to the mounting end of the bearing spring support and display the load force; the displacement detection device is connected to the mounting seat assembly, and its detecting end is used for contacting the outer cylindrical surface of the bearing spring support mounting end or the loading end of the stepless loading device, so as to display the displacement of the bearing spring support mounting end along the loading direction after being acted upon by the loading force.

[0007] Furthermore, the clamping and fixing device includes an arc-shaped main pressure plate, a straight plate-shaped auxiliary pressure plate, a plurality of first fastening nails and a plurality of second fastening nails that play a fixing role; the main pressure plate and the auxiliary pressure plate are arranged relatively to each other to respectively clamp the mounting edges of the bearing spring support, and the main pressure plate is adjustably fixed to the mounting surface by means of a plurality of first fastening nails passing through it, and the auxiliary pressure plate is adjustably fixed to the mounting surface by means of a plurality of second fastening nails passing through it.

[0008] Furthermore, the mounting surface is provided with a plurality of first screw hole groups arranged in sequence along the radial direction, and each first screw hole group includes a plurality of first screw holes arranged in sequence along the arc extension direction of the main pressure plate. The main pressure plates with different curvatures are selected and fixed with the corresponding first screw hole groups to adapt to the fixation of the elastic support mounting edges of bearings with different outer diameters; or, a group of first screw holes arranged in sequence along the arc extension direction of the main pressure plate are processed on the mounting surface, and waist-shaped holes are arranged through the main pressure plate corresponding to each first screw hole, and each waist-shaped hole extends radially, so as to adjust the relative position of the first fastening nail and the waist-shaped hole, and then adjust the fixed position of the main pressure plate on the mounting surface to adapt to the fixation of the elastic support mounting edges of bearings with different outer diameters.

[0009] Furthermore, the mounting surface is provided with a plurality of second screw hole groups arranged in parallel and at intervals, and each second screw hole group includes a plurality of second screw holes arranged in sequence and at intervals along the length direction of the auxiliary pressure plate; the auxiliary pressure plate is provided with a plurality of mounting grooves arranged in parallel and at intervals and extending along its length direction, and the relative position of the second fastening pin and the mounting groove is adjusted, thereby adjusting the fixed position of the auxiliary pressure plate on the mounting surface to adapt to the fixation of the spring-support mounting edge of bearings with different outer diameters.

[0010] Furthermore, the stepless loading device includes a loading lock body, a load loading assembly and a rigidity adjustment connection assembly; the loading lock body is used to be installed on the outer circle of the bearing elastic support mounting end, and the rigidity adjustment connection assembly is connected to the lower platen; the two ends of the load loading assembly are respectively connected to the loading lock body and the rigidity adjustment connection assembly, so as to be used to relatively tighten the loading lock body and the rigidity adjustment connection assembly under the action of external force, and then apply a vertical load to the mounting end of the bearing elastic support through the loading lock body and display the load force size, and the rigidity adjustment connection assembly is also used to adjust the overall stiffness of the stepless loading device.

[0011] Furthermore, the loading lock body includes a loading plate and a locking plate that are relatively arranged, and a locking bolt for relatively locking and fixing the two; the loading plate and the locking plate are used to be relatively arranged on both sides of the outer circle of the bearing spring support mounting end, and are relatively locked by two sets of locking bolts to clamp the bearing spring support, and the locking plate is connected to the load loading assembly.

[0012] Furthermore, the load loading assembly includes a pull rod, a force sensor for measuring the load force, a stepless loader for steplessly loading the displacement load, a first connector and a second connector; one end of the pull rod is connected to the first connector, the other end of the first connector is connected to the loading lock body, the other end of the pull rod is connected to the force sensor, the other end of the force sensor is connected to the stepless loader, the other end of the stepless loader is connected to the second connector, and the other end of the second connector is connected to the rigid adjustment connection assembly.

[0013] Furthermore, the stepless loader includes an upper threaded barrel and a lower threaded barrel arranged at a relative interval, and a loading bolt threadedly connected therebetween; the upper end of the upper threaded barrel is connected to a force sensor, and the lower end of the lower threaded barrel is connected to a second connecting head, so as to control the displacement load size per unit torsion angle of the load loading component by setting the upper threaded barrel and the lower threaded barrel to have the same or different pitches and the same or opposite thread rotation directions.

[0014] Furthermore, the test bench includes an upper platen and a lower platen which are arranged in sequence and are horizontal; the stepless loading device also includes a torque-stop assembly for preventing the load loading assembly from twisting, and the torque-stop assembly includes a torque-stop base fixed on the lower platen, a torque-stop rod vertically supported on the torque-stop base, and a torque-stop wrench; one end of the torque-stop wrench is connected to the torque-stop rod, and the other end of the torque-stop wrench clamps the upper threaded tube.

[0015] Furthermore, the rigid adjustment connection assembly includes an elastic base plate, a pin connection seat fixed on the elastic base plate, multiple groups of pads and multiple groups of T-bolts; the elastic base plate is supported on the lower plate through multiple groups of pads, and is fixed to the lower plate through multiple groups of T-bolts; the second connecting head is hinged to the pin connection seat.

[0016] The present invention has the following beneficial effects: Compared with the prior art in which the clamping device is installed on the outer circle of the bearing spring and then the mounting edge is pressed against the mounting surface, in the aviation bearing spring stiffness measuring device of the present invention, the clamping and fixing device is adjustably connected to the mounting surface. On the one hand, the mounting edge of the end of the bearing spring is clamped at multiple locations along the circumference by the clamping and fixing device, so that the mounting edge is tightly attached to the mounting surface and the bearing spring is fixed. At the same time, the clamping and fixing device clamps the mounting edge at multiple locations along the circumference of the mounting edge, rather than being first installed on the outer circle of the bearing spring and then clamping the mounting edge. Therefore, the clamping and fixing device clamps the mounting edge at multiple locations and is not affected by the outer circle diameter of the bearing spring, and the clamping and fixing device is also adjustably connected to the mounting surface, so that the bearing spring of a certain diameter range can be fixed, avoiding the heavy weight of the clamping device. Complex design and processing can improve measurement efficiency and reduce fixture management costs; on the other hand, in the measuring device of the present invention, the stepless loading device can apply a vertical stepless load to the mounting end of the bearing spring support and display the load force, so as to easily obtain the spring support stiffness of the bearing spring support by combining the displacement change value of the bearing spring support mounting end along the loading direction detected by the displacement detection device. At the same time, the stepless loading device can apply the load steplessly, and the load loading range is wide, continuously adjustable, and not restricted by the mass of the weights. The loading range can cover a few kilograms to more than 1000 kilograms, which can effectively improve the measurement accuracy of large stiffness test pieces; the measuring device of the present invention has been successfully used in the bearing spring support stiffness test of a certain type of turboshaft engine, with normal function, expected results, simple operation, safety and reliability.

[0017] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a schematic diagram of the spatial structure of the squirrel cage bearing spring support; Figure 2 It is a schematic diagram of the spatial structure of an aviation bearing elastic support stiffness measuring device according to a preferred embodiment of the present invention; Figure 3 It is a schematic diagram of the spatial structure of the clamping and fixing device; Figure 4 yes Figure 3 Schematic diagram of the spatial structure of the middle mounting seat; Figure 5 yes Figure 3 Schematic diagram of the spatial structure of the middle auxiliary pressure plate; Figure 6 yes Figure 2 Schematic diagram of the spatial structure of the stepless loading device.

[0019] Legend: 1. Test bench; 11. Upper platform; 12. Lower platform; 2. Mounting seat assembly; 201. Mounting surface; 202. First screw hole; 203. Second screw hole; 21. Mounting seat; 22. Fixing member; 31. Main pressing plate; 32. Auxiliary pressing plate; 33. First fastening nail; 34. Second fastening nail; 5. Loading lock body; 51. Loading plate; 52. Locking plate; 53. Locking bolt; 6. Load loading assembly; 61. Pull rod; 62. Force sensor; 63. Stepless loader; 631. Upper threaded barrel; 632. Lower threaded barrel; 633. Loading bolt; 64. First connector; 65. Second connector; 7. Adjustment and connection assembly; 71. Elastic bottom plate; 72. Pin connection seat; 73. Spacer block; 74. T-bolt; 8. Anti-twist assembly; 81. Anti-twist base; 82. Anti-twist rod; 83. Anti-twist wrench; 9. Displacement detection device; 91. Mounting frame; 92. Displacement sensor. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0021] Reference Figure 1-2 The preferred embodiment of the present invention provides an aviation bearing elastic support stiffness measuring device, comprising: a test bench 1, a mounting seat assembly 2 mounted on the test bench 1, a clamping and fixing device, a stepless loading device and a displacement detection device 9. A vertical mounting surface 201 is provided on the mounting seat assembly 2, and the clamping and fixing device is adjustably connected to the mounting surface 201, so as to be used to clamp the mounting edge at multiple locations along the circumference of the mounting edge of the end of the bearing elastic support, so that the mounting edge is close to the mounting surface 201 to fix the bearing elastic support, and to adapt to the fixing requirements of bearing elastic supports of different outer diameters. The loading end of the stepless loading device is fixed to the mounting end of the bearing elastic support for mounting the bearing, and the opposite connecting end of the stepless loading device is connected to the test bench 1, so as to apply a vertical stepless load to the mounting end of the bearing elastic support and display the load force. The displacement detection device 9 is connected to the mounting seat assembly 2, and its detection end is used to contact the outer cylindrical surface of the bearing elastic support mounting end or the loading end of the stepless loading device, so as to display the displacement of the bearing elastic support mounting end along the loading direction after the loading force acts on it.

[0022] Compared with the prior art in which the clamping device is installed on the outer circle of the bearing spring and then the mounting edge is pressed against the mounting surface, in the aviation bearing spring stiffness measuring device of the present invention, the clamping and fixing device is adjustably connected to the mounting surface 201. On the one hand, the mounting edge of the end of the bearing spring is clamped at multiple locations along the circumference by the clamping and fixing device, so that the mounting edge is tightly attached to the mounting surface 201 and the bearing spring is fixed. At the same time, the clamping and fixing device clamps the mounting edge at multiple locations along the circumference of the mounting edge, rather than first being installed on the outer circle of the bearing spring and then clamping the mounting edge. Therefore, the clamping and fixing device clamps the mounting edge at multiple locations and is not affected by the outer circle diameter of the bearing spring, and the clamping and fixing device is also adjustably connected to the mounting surface 201, so that the bearing spring of a certain diameter range can be fixed to avoid clamping. Repeated design and processing of the device can improve measurement efficiency and reduce fixture management costs; on the other hand, in the measuring device of the present invention, the stepless loading device can apply a vertical stepless load to the mounting end of the bearing spring support and display the load force, so that the spring support stiffness of the bearing spring support can be easily obtained in combination with the displacement change value of the bearing spring support mounting end along the loading direction detected by the displacement detection device 9. At the same time, the stepless loading device can apply the load steplessly, and the load loading range is wide, continuously adjustable, and not restricted by the mass of the weights. The loading range can cover a few kilograms to more than 1000 kilograms, which can effectively improve the measurement accuracy of large stiffness test pieces; the measuring device of the present invention has been successfully used in the bearing spring support stiffness test of a certain type of turboshaft engine, with normal functions, expected results, simple operation, and safety and reliability.

[0023] Alternatively, if Figure 2 As shown, the test bench 1 includes an upper platen 11 and a lower platen 12 which are arranged in sequence and are horizontal. The mounting seat assembly 2 includes a mounting seat 21 with one end supported on the upper platen 11 and the other end suspended above the lower platen 12, and a plurality of fixing members 22 connected to the upper platen 11 for fixing the mounting seat 21 to the upper platen 11. The end surface of the suspended end of the mounting seat 21 forms a mounting surface 201. In this optional solution, if Figure 2 As shown, a T-slot is provided on the upper platen 11; multiple groups of fixing members 22 are sequentially arranged along the length direction of the mounting seat 21, and each fixing member 22 includes a pressing plate and multiple groups of T-bolts; the pressing plate is pressed on the top surface of the mounting seat 21, and the T-bolt is vertically arranged, with its lower end connected to the T-slot, and its upper end opposite to the pressing plate is passed through and then tightened and fixed by a nut, so that the pressing plate presses the mounting seat 21 onto the upper platen 11. The mounting seat 21 is simple to fix and disassemble, and easy to implement.

[0024] Alternatively, if Figure 3As shown, the clamping and fixing device includes an arc-shaped main pressure plate 31, a straight plate-shaped auxiliary pressure plate 32, a plurality of first fastening nails 33 and a plurality of second fastening nails 34 for fixing. The main pressure plate 31 and the auxiliary pressure plate 32 are arranged relatively to each other, so as to respectively clamp the mounting edges of the bearing spring support, and the main pressure plate 31 is adjustably fixed to the mounting surface 201 by means of the plurality of first fastening nails 33 passing through it, and the auxiliary pressure plate 32 is adjustably fixed to the mounting surface 201 by means of the plurality of second fastening nails 34 passing through it. In this optional scheme, the main pressure plate 31 is used to fix the upper edge of the bearing spring support mounting edge, and its shape is an arc, preferably a parabola, which can provide effective clamping for the bearing spring support mounting plates within a certain diameter range; the auxiliary pressure plate 32 is used to clamp the lower edge of the bearing spring support mounting edge, such as Figure 5 As shown, the top of the auxiliary pressure plate 32 is an arc to provide a larger clamping area for the installation edge. Therefore, in this embodiment, the clamping and fixing device has a simple structure and is easy to process and prepare. At the same time, through the cooperation of the main pressure plate 31 and the auxiliary pressure plate 32, it can adapt to the fixing requirements of bearing springs of different diameters, avoid repeated design and processing of the test fixture, improve efficiency and reduce fixture management costs.

[0025] In this option, if Figure 3-4 As shown, the mounting surface 201 is provided with a plurality of first screw hole groups arranged in sequence along the radial direction, and each first screw hole group includes a plurality of first screw holes 202 arranged in sequence and at intervals along the arc extension direction of the main pressure plate 31. The main pressure plates 31 with different curvatures are selected and fixed with the corresponding first screw hole groups to adapt to the fixation of the elastic support mounting edges of bearings with different outer diameters. Alternatively, not shown, a plurality of first screw holes 202 arranged in sequence and at intervals along the arc extension direction of the main pressure plate 31 are processed on the mounting surface 201, and waist-shaped holes are provided through the main pressure plate 31 at the positions corresponding to the first screw holes 202, and each waist-shaped hole extends in the radial direction, so as to adjust the relative position of the first fastening nail 33 and the waist-shaped hole, and then adjust the fixed position of the main pressure plate 31 on the mounting surface 201, so as to adapt to the fixation of the elastic support mounting edges of bearings with different outer diameters.

[0026] In this option, if Figure 3-5 As shown, the mounting surface 201 is provided with a plurality of second screw hole groups arranged in parallel and at intervals, and each second screw hole group includes a plurality of second screw holes 203 arranged in sequence and at intervals along the length direction of the auxiliary pressing plate 32. The auxiliary pressing plate 32 is provided with a plurality of mounting grooves arranged in parallel and at intervals and extending along its length direction. By adjusting the relative position of the second fastening nail 34 and the mounting groove, the fixing position of the auxiliary pressing plate 32 on the mounting surface 201 is adjusted to adapt to the fixing of the spring-supported mounting edge of bearings with different outer diameters.

[0027] Alternatively, if Figure 2 and Figure 6As shown, the stepless loading device includes a loading lock body 5, a load loading assembly 6 and a rigidity adjustment connection assembly 7. The loading lock body 5 is used to be installed on the outer circle of the bearing elastic support mounting end, and the rigidity adjustment connection assembly 7 is connected to the lower plate 12. The two ends of the load loading assembly 6 are respectively connected to the loading lock body 5 and the rigidity adjustment connection assembly 7, so as to relatively tighten the loading lock body 5 and the rigidity adjustment connection assembly 7 under the action of external force, and then apply a vertical load to the mounting end of the bearing elastic support through the loading lock body 5 and display the load force. The rigidity adjustment connection assembly 7 is also used to adjust the rigidity of the stepless loading device as a whole.

[0028] In this option, if Figure 3 As shown, the loading lock body 5 includes a loading plate 51 and a locking plate 52 arranged opposite to each other, and a locking bolt 53 for locking and fixing the two relative to each other. The loading plate 51 and the locking plate 52 are used to be arranged opposite to each other on both sides of the outer circle of the bearing spring support mounting end, and are relatively locked by two sets of locking bolts 53 to clamp the bearing spring support, and the locking plate 52 is connected to the load loading assembly 6. Preferably, as Figure 3 As shown, the contact points between the loading plate 51 and the locking plate 52 and the outer cylindrical surface of the bearing spring-support mounting end are formed by three arc surfaces connected in sequence, which can meet the loading requirements of the bearing spring-support mounting end within a certain diameter range. Therefore, in this optional solution, the loading lock body 5 has a simple structure and is easy to process and prepare. At the same time, through the cooperation of the loading plate 51 and the locking plate 52, it can adapt to the clamping requirements of the bearing spring-support mounting ends of different diameters, avoid repeated design and processing of the test fixture, improve efficiency and reduce fixture management costs.

[0029] In this option, if Figure 2 and Figure 6 As shown, the load loading assembly 6 includes a pull rod 61, a force sensor 62 for measuring the load force, a stepless loader 63 for steplessly loading the displacement load, a first connector 64, and a second connector 65. One end of the pull rod 61 is connected to the first connector 64, the other end of the first connector 64 is connected to the loading lock body 5, the other end of the pull rod 61 is connected to the force sensor 62, the other end of the force sensor 62 is connected to the stepless loader 63, the other end of the stepless loader 63 is connected to the second connector 65, and the other end of the second connector 65 is connected to the rigid connection assembly 7.

[0030] Furthermore, if Figure 6As shown, the stepless loader 63 includes an upper threaded barrel 631 and a lower threaded barrel 632 arranged at a relative interval, and a loading bolt 633 threadedly connected therebetween. The upper end of the upper threaded barrel 631 is connected to the force sensor 62, and the lower end of the lower threaded barrel 632 is connected to the second connector 65, so as to control the displacement load size of the load loading assembly 6 per unit torsion angle by setting the same or different pitches and the same or opposite thread rotation directions of the upper threaded barrel 631 and the lower threaded barrel 632. During loading, the upper and lower ends of the loading bolt 633 are respectively connected to the upper threaded barrel 631 and the lower threaded barrel 632, and the upper threaded barrel 631 and the lower threaded barrel 632 can be pulled closer and farther apart by twisting the loading bolt 633, that is, the loading and unloading process. In practice, different pitches can be selected for the upper threaded barrel 631 and the lower threaded barrel 632, or the upper threaded barrel 631 and the lower threaded barrel 632 can be controlled to have the same or opposite rotation directions, and the displacement load size applied by the loading bolt 633 rotating one circle can be controlled by these two methods. For example, assuming that the upper thread pitch of the loading bolt 633 is P1 and the lower thread pitch is P2, if the upper thread barrel 631 and the lower thread barrel 632 have the same rotation direction, the displacement load of the loading bolt 633 when it rotates one circle is the absolute value of P1-P2; if the upper thread barrel 631 and the lower thread barrel 632 have opposite rotation directions, the displacement load of the loading bolt 633 when it rotates one circle is P1+P2. In this way, the displacement load per unit torsion angle of the stepless loader 63 can be controlled to adapt to different loading requirements.

[0031] In this option, if Figure 6 As shown, the rigidity adjustment connection assembly 7 includes an elastic base plate 71, a pin connection seat 72 fixed on the elastic base plate 71, multiple groups of pads 73 and multiple groups of T-bolts 74. The elastic base plate 71 is supported on the lower plate 12 by multiple groups of pads 73, and is fixed to the lower plate 12 by multiple groups of T-bolts 74. The second connector 65 is hinged to the pin connection seat 72. In this optional scheme, the function of the elastic base plate 71 is to adjust the series stiffness of the system; the load force applied by the stepless loading device is equal to the displacement load multiplied by the series stiffness of the system, that is, F=P*k, where F is the load force, P is the displacement load applied by the load loading assembly 6, and k is the series stiffness of the system, which is mainly determined by the stiffness of the bearing elastic support and the stiffness of the elastic base plate 71. By increasing or decreasing the thickness of the elastic base plate 71, the load force applied by the unit displacement load can be controlled, so that the loading accuracy can be controlled to meet the loading requirements of the device for test pieces with different stiffness.

[0032] Preferably, if Figure 2 and Figure 6As shown, the stepless loading device also includes a torsion-stop assembly 8 for preventing the load loading assembly 6 from twisting. The torsion-stop assembly 8 includes a torsion-stop base 81 fixed on the lower plate 12, a torsion-stop rod 82 vertically supported on the torsion-stop base 81, and a torsion-stop wrench 83. One end of the torsion-stop wrench 83 is connected to the torsion-stop rod 82, and the other end of the torsion-stop wrench 83 clamps the upper threaded cylinder 631. In this preferred embodiment, as Figure 6 As shown, a square groove is machined inside the anti-twist base 81, and the lower end of the anti-twist rod 82 is clamped in the square groove to prevent the anti-twist rod 82 from twisting. The upper end cross-section of the anti-twist rod 82 is polygonal, and the anti-twist wrench 83 is mounted on the outer circle of the upper end of the anti-twist rod 82 to prevent twisting, or the upper end of the anti-twist rod 82 and the anti-twist wrench 83 are slotted to simultaneously connect the anti-twist key, and the anti-twist wrench 83 is forked tightly on the upper threaded tube 631 to prevent twisting, thereby preventing twisting of the load loading component 6.

[0033] Alternatively, if Figure 2 As shown, the displacement detection device 9 includes a mounting frame 91 fixed on the mounting seat assembly 2, and a displacement sensor 92 which is vertically arranged and the upper end is fixedly connected to the mounting frame 91 and the lower end is suspended. Preferably, the surface on the loading plate 51 of the loading lock body 5 for contacting the detection end of the displacement sensor 92 is a plane to improve the detection accuracy and detection stability.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An aviation bearing elastic stiffness measuring device, characterized in that: include: A test bench (1), a mounting seat assembly (2) mounted on the test bench (1), a clamping and fixing device, a stepless loading device and a displacement detection device (9); A vertical mounting surface (201) is provided on the mounting seat assembly (2), and the clamping and fixing device includes an arc-shaped main pressure plate (31), a straight plate-shaped auxiliary pressure plate (32), a plurality of first fastening nails (33) and a plurality of second fastening nails (34) for fixing; the main pressure plate (31) and the auxiliary pressure plate (32) are arranged relative to each other to respectively clamp the mounting edges of the bearing spring support, and the main pressure plate (31) is adjustably fixed to the mounting surface (201) by the plurality of first fastening nails (33) passing through it, and the auxiliary pressure plate (32) is adjustably fixed to the mounting surface (201) by the plurality of second fastening nails (34) passing through it; The loading end of the stepless loading device is fixed to the mounting end of the bearing spring support for mounting the bearing, and the connecting end of the stepless loading device is connected to the test bench (1) to apply a vertical stepless load to the mounting end of the bearing spring support and display the load force; The displacement detection device (9) is connected to the mounting seat assembly (2), and its detection end is used to contact the outer cylindrical surface of the bearing elastic support mounting end or the loading end of the stepless loading device to display the displacement size of the bearing elastic support mounting end along the loading direction after the loading force acts on it.

2. The device for measuring the elastic stiffness of an aviation bearing according to claim 1, characterized in that: The mounting surface (201) is provided with a plurality of first screw hole groups arranged in sequence along the radial direction, each first screw hole group comprising a plurality of first screw holes (202) arranged in sequence and at intervals along the arc extension direction of the main pressure plate (31), and main pressure plates (31) with different curvatures are selected to be matched and fixed with corresponding first screw hole groups, so as to adapt to the fixing of elastic support mounting edges of bearings with different outer diameters; Alternatively, a group of first screw holes (202) arranged in sequence and spaced apart along the arc extension direction of the main pressure plate (31) are processed on the mounting surface (201), and waist-shaped holes are provided through the main pressure plate (31) at positions corresponding to each first screw hole (202), and each waist-shaped hole extends radially, so that the fixed position of the main pressure plate (31) on the mounting surface (201) can be adjusted by adjusting the relative position of the first fastening pin (33) and the waist-shaped hole, so as to adapt to the fixation of the spring-supported mounting edge of bearings with different outer diameters.

3. The device for measuring the elastic stiffness of an aviation bearing according to claim 1, characterized in that: The mounting surface (201) is provided with a plurality of second screw hole groups arranged in parallel and at intervals, each second screw hole group comprising a plurality of second screw holes (203) arranged in sequence and at intervals along the length direction of the auxiliary pressing plate (32); The auxiliary pressure plate (32) is provided with a plurality of installation grooves which are arranged in parallel and spaced apart and extend along its length direction. By adjusting the relative position of the second fastening pin (34) and the installation groove, the fixing position of the auxiliary pressure plate (32) on the installation surface (201) is adjusted to adapt to the fixing of the spring-supported installation edge of bearings with different outer diameters.

4. The device for measuring the elastic stiffness of an aviation bearing according to claim 1, characterized in that: The stepless loading device comprises a loading lock body (5), a load loading component (6) and a rigidity adjustment connection component (7); The loading lock body (5) is used to be installed on the outer circle of the bearing spring support installation end, and the rigidity adjustment connection component (7) is connected to the lower platform (12); The two ends of the load-applying assembly (6) are respectively connected to the loading lock body (5) and the rigidity-adjusting connection assembly (7) so as to relatively tighten the loading lock body (5) and the rigidity-adjusting connection assembly (7) under the action of an external force, thereby applying a vertical load to the mounting end of the bearing spring support through the loading lock body (5) and displaying the magnitude of the load force. The rigidity-adjusting connection assembly (7) is also used to adjust the rigidity of the entire stepless loading device.

5. The device for measuring the elastic stiffness of an aviation bearing according to claim 4, characterized in that: The loading lock body (5) comprises a loading plate (51) and a locking plate (52) which are arranged opposite to each other, and a locking bolt (53) for locking and fixing the two relative to each other; The loading plate (51) and the locking plate (52) are arranged relatively on two sides of the outer circle of the bearing spring support installation end, and are relatively locked by two sets of locking bolts (53) to clamp the bearing spring support, and the locking plate (52) is connected to the load loading assembly (6).

6. The device for measuring the elastic stiffness of an aviation bearing according to claim 4, characterized in that: The load loading assembly (6) comprises a pull rod (61), a force sensor (62) for measuring the magnitude of the load force, a stepless loader (63) for steplessly loading the displacement load, a first connector (64) and a second connector (65); One end of the pull rod (61) is connected to the first connector (64), the other end of the first connector (64) is connected to the loading lock body, the other end of the pull rod (61) is connected to the force sensor (62), the other end of the force sensor (62) is connected to the stepless loader (63), the other end of the stepless loader (63) is connected to the second connector (65), and the other end of the second connector (65) is connected to the rigidity adjustment connection assembly (7).

7. The device for measuring the elastic stiffness of an aviation bearing according to claim 6, characterized in that: The stepless loader (63) comprises an upper threaded cylinder (631) and a lower threaded cylinder (632) which are arranged relatively spaced apart, and a loading bolt (633) threadedly connected between the upper threaded cylinder and the lower threaded cylinder. The upper end of the upper threaded barrel (631) is connected to the force sensor (62), and the lower end of the lower threaded barrel (632) is connected to the second connector (65), so that the displacement load per unit torsion angle of the load applying assembly (6) can be controlled by setting the upper threaded barrel (631) and the lower threaded barrel (632) to have the same or different pitches and the same or opposite thread rotation directions.

8. The device for measuring the elastic stiffness of an aviation bearing according to claim 7, characterized in that: The test bench (1) comprises an upper platform (11) and a lower platform (12) which are arranged in sequence and are horizontal. The stepless loading device also includes a torsion-stop assembly (8) for preventing the load loading assembly (6) from twisting, the torsion-stop assembly (8) including a torsion-stop base (81) fixed on the lower platform (12), a torsion-stop rod (82) vertically supported on the torsion-stop base (81), and a torsion-stop wrench (83); One end of the anti-torque wrench (83) is connected to the anti-torque rod (82), and the other end of the anti-torque wrench (83) clamps the upper threaded cylinder (631).

9. The device for measuring the elastic stiffness of an aviation bearing according to claim 8, characterized in that: A square groove is machined inside the anti-twist base (81); The lower end of the anti-twist rod (82) is clamped in the square groove, thereby preventing the anti-twist rod (82) from twisting. The upper end of the anti-twist rod (82) has a polygonal cross section, and the anti-twist wrench (83) is sleeved on the outer circle of the upper end of the anti-twist rod (82) to prevent twisting. Alternatively, a anti-twist key is provided between the upper end of the anti-twist rod (82) and the anti-twist wrench (83) through a slot to connect the two, and the anti-twist wrench (83) is tightened on the upper threaded tube (631) to prevent twisting, thereby preventing the load loading assembly (6) from twisting.

10. The device for measuring the elastic stiffness of an aviation bearing according to claim 8, characterized in that: The rigidity-adjusting connection assembly (7) comprises an elastic base plate (71), a pin connection seat (72) fixed on the elastic base plate (71), a plurality of groups of cushion blocks (73) and a plurality of groups of T-bolts (74); The elastic bottom plate (71) is supported on the lower plate (12) by a plurality of sets of cushion blocks (73), and is fixed to the lower plate (12) by a plurality of sets of T-bolts (74); The second connecting head (65) is hingedly connected to the pin connecting seat (72).

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