Rotor inner cavity bolt connection rigidity detection equipment

Abstract

The invention belongs to the technical field of disc-shaped flange part detection equipment, and discloses rotor inner cavity bolt connection rigidity detection equipment. The rotor inner cavity bolt connection rigidity automatic detection equipment comprises a clamping module, a lifting module, a rotation module and a probe test module which are all integrated on a main body rack, the clamping module is used for clamping and positioning, the lifting module is used for providing pressing force for a test probe and a tested piece, and the rotation module is used for rotating the test probe and the tested piece. The rotation module is used for circumferential indexing positioning among different measurement positions, and the probe test module is used for testing the connection rigidity of a single bolt. All the functions are realized by adopting a semi-automatic means, so that the test working efficiency and the test precision can be improved. According to the automatic detection equipment, a solution of a method for placing a test probe in a space circumferential rotation mode, wherein the test probe is carried in a restricted space on one side, and automatic operation of the evaluation parameter testing and obtaining process of bolt connection in the restricted space of an inner cavity of a disc-shaped part is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of disc-shaped flange parts detection equipment and relates to a rotor inner cavity bolt connection stiffness detection equipment. Background Art

[0002] The rotor of an aero-engine is assembled by bolting disc-shaped flange parts such as various levels of wheels, drums, and comb discs. Therefore, the state of the bolt connection is an important factor affecting the quality of engine assembly. When the aero-engine is working, the aero-engine rotor is subjected to various extreme conditions such as high load, high speed, and high temperature. If there are problems such as non-uniformity or dispersion in the state of the bolt connection, the engine rotor will produce additional vibration and unbalanced response, thereby affecting the overall service performance of the aero-engine. Therefore, it is of great significance to detect the bolt assembly stiffness of disc-shaped flange parts in aero-engines.

[0003] Among the existing bolt stiffness detection technologies, the ultrasonic detection method has obvious advantages. It can complete non-destructive testing in-situ without destroying the assembly structure, and has high detection accuracy. It can be selected as a bolt assembly stiffness detection method for detection equipment. It is particularly important to provide physical means for ultrasonic testing within the restricted rotor space. Therefore, it is necessary to realize the fixed installation and circumferential indexing functions of the ultrasonic probe to realize the circumferential multi-bolt group stiffness detection of the disc-shaped flange parts assembly.

[0004] Mu Xiaokai et al. disclosed an interface stiffness detection device based on solid coupling in the patent "An interface stiffness detection device based on solid coupling". The device uses electromagnetic force and spring elastic force to provide drive for controlling the positioning telescopic rod, thereby controlling the telescopic action of the positioning telescopic rod. The process has the phenomenon of force impact, which is easy to cause poor tightening positioning accuracy. The test probe of the device needs to be manually moved to the specified position and then adsorbed at the position to be tested by magnetic force. There is also poor positioning accuracy. The entire test process of the device has a low degree of automation and a low level of positioning accuracy control. Yuan Bo et al. disclosed an ultrasonic detection fixture for the interface stiffness of an aircraft engine disc drum in the patent "An interface stiffness detection device based on solid coupling". The device fixes the fixture to the outside of the flange through a manual tightening structure, and places the test probe at the tightening position for testing. The clamping process is a manual operation with low positioning accuracy, and each bolt at a position needs to release the tightening structure and then move to a new position and repeat the tightening operation. The positioning repeatability accuracy is low, the overall automation level of the device is low, and the positioning accuracy control level is low.

[0005] The existing bolt stiffness testing equipment has the following problems:

[0006] 1) Poor specificity, no bolt stiffness testing equipment for special aircraft engine disc flange parts assembly

[0007] 2) Accessibility is poor. The rotor assembly space of the aircraft engine disc flange parts is highly restricted, and the test equipment is prone to interfere with the test piece.

[0008] 3) The test accuracy is poor. The test equipment needs to detect bolts at dozens of positions around the rotor. During the test, it is difficult to ensure the accuracy of testing the bolt stiffness at different positions. Summary of the invention

[0009] The present invention provides a solution for testing in a strongly restricted space, and relates to a method for placing a test probe in a circumferentially rotating space. The method is suitable for strongly restricted spaces such as the inner cavity of a rotor, and can realize automatic detection of evaluation parameters such as bolt connection stiffness.

[0010] The technical solution of the present invention:

[0011] A rotor inner cavity bolt connection stiffness detection device comprises a clamping module, a lifting module, a rotation module, a probe test module and a main frame. The modules are interconnected to ensure effective operation contact.

[0012] The main frame consists of two parts, the upper and lower frames, including structures such as the upper frame connection plate, the lower frame connection plate, and common sliding spline shafts and other components. The upper and lower frame connection plates are connected to other modules to achieve axial reciprocating motion along the common spline shaft, and have two motion phases of free state and installation state end points. In the free state, the upper and lower connection plates move to the farthest end of the relative position, driving other modules to maintain the free state of the entire device, thereby minimizing the overall radial volume. In the installation state, the upper and lower frame connection plates move to the nearest end of the relative position, driving other modules to maintain the installation state of the entire device, so that the whole is relatively fixed with the rotor disk.

[0013] The clamping module is arranged in a circumferential array around the main frame, including a claw connecting rod mechanism and a power output end supported by the frame. The power output end adopts a lower servo, which generates an axial displacement output by rotating the connecting screw, driving the axial displacement of the screw nut to realize the relative and opposite movement of the upper and lower connecting plates of the frame. In the free state, the module claw connecting rod mechanism is tightened to minimize the radial storage size of the entire device. In the installed state, the module claw connecting rod mechanism is unfolded to fix the relative position of the overall structure of the test device and the tested part to achieve the centering clamping effect. The variable claw connecting rod mechanism of the bearing contained in the clamping module can be relatively deformed with the relative and opposite movement of the upper and lower parts of the main frame.

[0014] The lifting module is located at the lower end of the connecting plate on the rack, and includes a motion mechanism bracket and a power output end supported by the bracket. The output end uses an electric push rod center rod to provide displacement output. The main function of the lifting module is to realize the switching of the lifting and lowering states of the rotary module and the probe test module at the upper end of the device when the rack body and the clamping module are in the working state, that is, in the installation state. This is manifested in the extension and retraction of the axial length between the connecting plate on the device rack and the connecting plate on the lower rack and the lifting and lowering action of the upper platform. The movement of the lifting module will drive other modules on the platform, including the rotary module and the probe test module, to realize the axial displacement of these modules, thereby realizing the corresponding functions.

[0015] The slewing module includes a motion mechanism and a power output end supported by a bracket. The output end uses an upper servo to drive the axial rotation torque of the sliding spline shaft. Its main function is to ensure the stable rotation of the rotating rotor relative to the stator to maintain the coaxiality and rotation stability. In the installed state, the slewing module realizes the circumferential rotation of the slewing bearing on the device and its mounting mechanism relative to the entire device. This will drive the probe test module on the rotating platform to realize the circumferential indexing rotation function, which is manifested as the measurement phase switching function of the stiffness test probe at the circumferential test point. In addition, the slewing module can also move axially on the sliding spline shaft, driving the main frame and lifting module connected to it, realizing the axial dimensional deformation function of the entire device, which is ultimately manifested as the displacement input of the clamping module.

[0016] The probe test module is located at the end of the lower connecting arm of the probe of the telescopic module. It is composed of a stiffness test probe, a buffer component and a fine-tuning component. It is designed to achieve precise positioning of the probe and maintain a stable clamping force to ensure the accuracy of the measurement structure and the stability of the measurement data. The stiffness test probe is tightly fixed to the probe movable part bracket and can move linearly relative to the fixed part bracket through spring buffering. When the lifting module moves into place, the probe test module plays a role, converting the displacement input into a stable clamping force output, and realizing the stable clamping and fitting action of the probe.

[0017] Beneficial effects of the present invention:

[0018] (1) The structure of the test device and its automated control system are suitable for highly restricted spaces such as narrow and long spaces. By carrying a test probe, it is possible to detect areas of the nut that are difficult to reach with the naked eye. This system realizes the placement and tightening of the probe, switching between different test points, and automated measurement of all axial test points. At the same time, the device itself can deform to achieve elongation and contraction of the axial and radial dimensions to complete the placement and removal of the entire device. It is worth noting that this set of devices can independently complete the above functions, which helps to reduce equipment costs.

[0019] (2) Each module can move with the overall frame and follow the axial groove. The designed opening mechanism is composed of various modules, which can enable the overall device to complete the changes in axial and radial dimensions according to the set trajectory, thereby reducing the overall size. This helps to effectively prevent structural collisions or damage to engine parts when the strongly restrictive rotor cavity is opened. The above-mentioned rotor cavity bolt connection stiffness automatic detection equipment can be used to carry out efficient testing work in a strongly restrictive space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the automated detection device.

[0021] Figure 2 This is the front view of the automated testing device.

[0022] Figure 3 This is a front view cross-sectional view of the automated testing device.

[0023] Figure 4 This is a working diagram of the automatic testing equipment for the stiffness of the bolts of the rotor inner cavity connection to detect the stiffness of the bolts of the test piece.

[0024] In the figure: 1 upper bearing outer ring upper base, 2 upper bearing outer ring lower base, 3 frame frame upper connecting plate, 4 connecting rod upper shaft seat, 5 connecting rod middle upper double shaft, 6 connecting rod middle upper single shaft, 7 circumferential clamping claws, 8 connecting rod middle lower single shaft, 9 connecting rod middle lower double shaft, 10 connecting rod lower single shaft, 11 connecting rod lower double shaft, 12 connecting rod lower shaft seat, 13 frame lower connecting plate, 14 probe upper connecting arm, 15 probe lower connecting arm, 16 probe arm clamping seat, 17 probe bearing clamping rod, 18 probe linear bearing, 19 probe clamping rod, 20 stiffness test probe, 21 guide rod clamping seat, 22 upper single shaft, 23 upper double shaft, 24 guide rod, 2 5 lower single rotating rod, 26 lower double rotating rod, 27 guide rod linear bearing clamping seat, 28 upper linear bearing upper base, 29 upper linear bearing lower base, 30 upper and lower servo mounting base, 31 upper servo mounting edge, 32 upper and lower servo mounting bottom edge, 33 upper servo, 34 lower servo, 35 lower servo mounting edge, 36 lower coupling, 37 lead screw, 38 lead screw nut, 39 electric push rod connecting piece, 40 electric push rod center rod, 41 electric push rod mounting edge, 42 electric push rod outer wall, 43 sliding spline shaft, 44 upper bearing inner ring upper base, 45 upper bearing inner ring lower base, 46 upper slewing bearing, 47 spline sliding bearing, 48 upper coupling, 49 short guide rod. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0026] A rotor inner cavity bolt connection stiffness detection device comprises a main frame, a clamping module, a lifting module, a rotation module and a probe test module, wherein the clamping module, the lifting module, the rotation module and the probe test module are all integrated on the main frame;

[0027] Main frame, see Figure 1 The modules of the rotor inner cavity bolt connection stiffness automatic detection equipment are connected to each other based on the main frame.

[0028] It includes an upper connecting plate 3 on the frame, a lower connecting plate 13 on the frame, a guide rod clamping seat 23, a guide rod 24, a guide rod linear bearing clamping seat 27, a sliding spline shaft 43 and a spline sliding bearing 47; the connecting rod upper rotating shaft seat 4 and the connecting rod lower rotating shaft seat 12 are respectively fixed on the lower surface of the upper connecting plate 3 on the frame and the upper surface of the lower connecting plate 13 on the frame; the spline sliding bearing 47 is sleeved on the sliding spline shaft 43, and slides along the spline groove on the sliding spline shaft 43 to perform reciprocating linear motion, so that the spline sliding bearing 47 transmits torque while performing linear motion; the spline sliding bearing 47 is connected to the center of the rotary module by the spline sliding bearing 47. The upper bearing inner ring upper base 44 and the upper bearing inner ring lower base 45 are connected to drive the rotary module and the probe test module to reciprocate up and down along the sliding spline shaft 43 to complete the switching between the free state and the installed state; the guide rod linear bearing clamping seat 27 is fixed on the upper surface of the frame lower connecting plate 13, and the guide rod clamping seat 23 is fixed on the lower surface of the frame upper connecting plate 3; one end of the guide rod 24 is fixed in the guide rod linear bearing clamping seat 27, and the other end is fixed in the guide rod linear bearing clamping seat 27, and the three cooperate to realize the distance and approach action between the frame upper connecting plate 3 and the frame lower connecting plate 13;

[0029] Clamping modules, see Figure 1 The clamping module realizes the clamping and fixing between the test device and the test piece. At the same time, the clamping module realizes the movement and deformation of the mechanism through its own power output to achieve the corresponding clamping function.

[0030] The clamping module comprises an upper shaft seat 4 for the connecting rod, an upper double shaft 5 for the connecting rod, an upper single shaft 6 for the connecting rod, a lower single shaft 8 for the connecting rod, a lower double shaft 9 for the connecting rod, a lower single shaft 10 for the connecting rod, a lower double shaft 11 for the connecting rod, a lower shaft seat 12 for the connecting rod, an upper single shaft 21, an upper double shaft 22, a guide rod clamping seat 23, a lower single shaft 25, a lower double shaft 26, a circumferential clamping claw 7, an upper and lower servo mounting base 30, a lower servo 34, a lower coupling 36, a lead screw 37 and a lead screw nut 38; the driving part of the clamping module is a lower servo 34 mounted on a connecting plate 3 on a frame through a servo mounting seat, an output shaft of the lower servo 34, a lower coupling 3 6. The lead screw 37 and the lead screw nut 38 are connected in sequence. The lead screw nut 38 is installed on the lower connecting plate 13 of the frame. By driving the rotation of the output shaft of the lower servo 34, the lead screw nut 38 is driven to move vertically along the axial direction. At the same time, the torsional torque is transmitted to the guide rod 24 between the upper connecting plate 3 of the frame and the lower connecting plate 13 of the frame, so that the circumferential clamping claw 7 connected by the three-link mechanism and the upper connecting plate 3 of the frame and the lower connecting plate 13 of the frame are approached or moved away from each other in a state of unchanged angular displacement, so that the circumferential clamping claw 7 is expanded or contracted, thereby clamping or loosening the inner diameter of the test piece to be tested before the test work is carried out; wherein, the circumferential clamping claw The holes in the upper and lower parts of the clamping claw 7 are respectively matched with the holes of the upper single rotating rod 21, the upper double rotating rod 22, the lower single rotating rod 25, and the lower double rotating rod 26 through the upper double rotating shaft 5 in the connecting rod, the upper single rotating shaft 6 in the connecting rod, the lower single rotating shaft 8 in the connecting rod, and the lower double rotating shaft 9 in the connecting rod by hole-axis clearance, so that large-angle rotation movement drives the contraction and expansion of the circumferential clamping claw 7. The upper single rotating rod 21 and the upper double rotating rod 22, the lower single rotating rod 25 and the lower double rotating rod 26 are respectively connected with the connecting rod upper rotating shaft seat 4 and the connecting rod lower rotating shaft seat 12 on the main frame through the hole-axis clearance. The contraction and expansion of the circumferential clamping claw 7 can drive the connecting plate 3, The upper and lower connecting plate 13 of the frame moves up and down; the upper single rotating rod 21, the upper double rotating rod 22, the lower single rotating rod 25, the lower double rotating rod 26 and the connecting rod upper rotating shaft seat 4 and the connecting rod lower rotating shaft seat 12 connected with the circumferential clamping claw 7 form a parallelogram structure, which can ensure that the circumferential clamping claw 7 is always parallel to the connecting rod upper rotating shaft seat 4 and the connecting rod lower rotating shaft seat 12, that is, the circumferential clamping claw 7 is always kept vertical, and the clamping module is unfolded or folded through the three-link mechanism. At the same time, the outer side surface of the circumferential clamping claw 7 is an arc surface of the same size as the inner diameter of the test piece, thereby ensuring that the force in the vertical direction is uniform with the inner diameter of the test piece under the clamping state;The lower servo 34, the upper and lower servo mounting seats 30, the lower coupling 36, the lead screw 37, the lead screw nut 38, the guide rod 24, the guide rod clamping seat 23, the guide rod linear bearing clamping seat 27, the upper connecting plate 3, and the lower connecting plate 13 constitute a lead screw slide mechanism. The lower servo 34 is fixed on the upper connecting plate 3 of the frame by the upper and lower servo mounting seats 30. The lower servo 34 is connected to the lead screw 37 through the lower coupling 36 to transmit the torque provided by the lower servo 34 to the lead screw 37. The lead screw nut 38 is placed on the lower connecting plate 13 of the frame and connected to the lead screw 37. The torque acting on the lead screw nut 38 is converted into an axial force to make the lower connecting plate 13 of the frame move axially, thereby controlling the expansion and contraction of the circumferential clamping claw 7 mechanism. At the same time, a guide rod 24, a guide rod clamping seat 23 and a guide rod linear bearing clamping seat 27 are arranged between the upper connecting plate 3 of the frame and the lower connecting plate 13 of the frame to prevent the torque from causing; the angular displacement change of the upper connecting plate 3 of the frame and the lower connecting plate 13 of the frame to avoid the deformation of the three-link mechanism causing the outer side surface of the circumferential clamping claw 7 to improperly cooperate with the inner diameter contact surface of the test piece;

[0031] Lifting module, see Figure 1 The lifting module is installed at the upper center of the rotor inner cavity bolt connection stiffness automatic detection equipment. Its function is to drive the modules mounted above through reciprocating lifting and lowering actions to realize the switching of the probe between different measuring points.

[0032] Located at the upper center of the automatic detection equipment for the stiffness of the bolt connection of the rotor cavity, it drives the modules mounted on the top through reciprocating lifting and lowering movements to realize the switching of the probe between different measuring points; the lifting module includes an upper base 1 for the outer ring of the upper bearing, a lower base 2 for the outer ring of the upper bearing, a connecting plate 3 on the frame, a guide rod linear bearing clamping seat 27, an upper linear bearing upper base 28, an upper linear bearing lower base 29, an upper slewing bearing 46, a short guide rod 49, a sliding spline shaft 43, a spline sliding bearing 47, an upper bearing inner ring upper base 44, an upper bearing inner ring lower base 45, an electric push rod connector 39, an electric push rod The rod center rod 40, the electric push rod installation edge 41 and the electric push rod outer wall 42; wherein, the upper bearing outer ring upper base 1, the upper bearing outer ring lower base 2 are respectively connected to the upper bearing inner ring upper base 44, the upper bearing inner ring lower base 45, to provide structural support for the upper rotary bearing 46; the upper bearing outer ring lower base 2, the frame upper connecting plate 3 are respectively connected to the upper linear bearing upper base 28, the upper linear bearing lower base 29, the upper linear bearing upper base 28 and the short guide rod 49 are fixed by means of interference hole shaft matching, the upper linear bearing lower base 29 realizes axial sliding action through the clearance matching between the linear bearing and the short guide rod 49, and the short guide rod 49 , the sliding spline shaft 43 is respectively matched with the inner ring upper base 44 and the clearance hole shaft of the upper bearing inner ring lower base 45; the electric push rod is divided into an electric push rod installation edge 41 and an electric push rod outer wall 42, both of which are connected to the connecting plate 3 on the frame, and the electric push rod center rod 40 is further connected to the electric push rod connecting piece 39, and the electric push rod center rod 40 provides power drive and structural support for the overall lifting of the lifting module; after the clamping module is clamped and fixed to the inner diameter of the test piece, in order to ensure that the test probe is placed in the correct position to complete the test, the rotary module and the probe test module need to be lifted and the position to be tested is adjusted. The driving component of this part is the electric push rod. The core rod 40 pushes up the lower base 2 of the upper bearing outer ring at the specified time, and the upper base 1 of the upper bearing outer ring is connected to the upper connecting arm 14 of the probe by screws. The lower base 2 of the upper bearing outer ring pushes the upper base 1 of the upper bearing outer ring and then drives the upper connecting arm 14 of the probe to lift up. The rotary module and the test module of the test mechanism move vertically along the axial direction under the guidance of the short guide rod 49 and the upper spline sliding bearing 47, thereby offsetting the overturning tendency caused by the position of the electric push rod. After the test probe is adjusted to the specified position, the central rod 40 of the electric push rod is retracted, so that the rotary module and the test module move downward, so that the test probe and the test piece are closely attached to complete the test work;

[0033] Swivel module, see Figure 1 The core part of the rotary module is located at the upper center of the rotor inner cavity bolt connection stiffness automatic detection equipment, which is responsible for realizing the circumferential rotation function of the overall test device. Through the rotation of the rotary platform, other modules connected to it, including the lifting module, are driven. When the overall test device is working, the rotary module enables the test probe to switch between different measuring points of the part to be measured and realize precise rotation angle control.

[0034] Responsible for realizing the circumferential rotation of the automatic detection equipment for the stiffness of the bolt connection of the inner cavity of the rotor; when the automatic detection equipment for the stiffness of the bolt connection of the inner cavity of the rotor is working, the rotation module enables the test probe to switch between different measuring points of the test piece to be tested and realizes precise rotation angle control; the rotation module includes a connecting plate 3 on the frame, an upper servo 33, an upper and lower servo mounting base 30, an upper servo mounting edge 31, an upper and lower servo mounting bottom edge 32, an upper coupling 48, a sliding spline shaft 43, a spline sliding bearing 47, an upper slewing bearing 46, an upper bearing inner ring upper base 44, an upper bearing inner ring lower base 45, an upper bearing outer ring upper base 1 and an upper bearing outer ring lower base 2; the connecting plate 3 on the frame is connected to the upper and lower servo mounting bases 30, the upper servo mounting edge 31, and the upper and lower servo mounting bottom edges 32 to provide structural support for the upper servo 33; the upper coupling 48 is connected to the sliding spline shaft 43, and the sliding spline shaft 43 is connected to the spline sliding bearing 47 The clearance fit retains the vertical movement freedom of the rotary module and limits the vertical rotation freedom, so that the rotational movement of the upper servo 33 shaft drives the rotational movement of the upper bearing inner ring upper base 44 and the upper bearing inner ring lower base 45 fixed by interference fit with the spline sliding bearing 47; the upper connecting plate 3 of the frame uses the upper and lower servo mounting bases 30, the upper servo mounting edge 31, and the upper and lower servo mounting bottom edges 32 to fix the servo, and the upper connecting plate 3 of the frame is fixed to the upper bearing outer ring upper base 1 and the upper bearing outer ring lower base 2 through the upper linear bearing upper base 28 and the upper linear bearing lower base 29. The upper servo 33 is connected to the sliding spline shaft 43 through the upper coupling 48 to transmit the rotational movement provided by the upper servo 33 to the upper spline sliding bearing 47, and then to the upper bearing inner ring upper base 44 and the upper bearing inner ring lower base 45, driving the test module to rotate to complete the indexing action, so that the test probe is placed in the correct position to complete the test;

[0035] Probe test module, see Figure 1 The probe buffer module is arranged at the end part of the probe connecting arm part and is equipped with a test probe to realize the precise positioning function of the test probe, thereby ensuring that the stable clamping force between the probe and the measured part is maintained when the automatic detection equipment for the stiffness of the rotor inner cavity bolt connection is working, and finally realizing the stability of the measurement structure and the reliability and stability of the measurement data.

[0036] The end of the probe upper connecting arm 14 is provided with a test probe to realize accurate positioning of the test probe, ensure stable pressing force between the test probe and the test piece during operation, and finally realize stability of the measurement structure; the probe test module includes the probe upper connecting arm 14, the probe lower connecting arm 15, the probe arm clamping seat 16, the probe bearing clamping rod 17, the probe linear bearing 18, the probe clamping rod 19 and the stiffness test probe 20; the probe upper connecting arm 14 is connected to the upper bearing inner ring upper base 44, the probe arm clamping seat 16 uses a top screw to fix the probe bearing clamping rod 17, and the probe arm clamping seat 16 and the probe clamping rod 19 are fixed to the probe bearing clamping rod 17. In order to achieve clearance fit, the probe clamping rod 19 is first moved radially and then fixed by a top screw, so that the stiffness test probe 20 can achieve fine adjustment of the radius length in the radial direction. The probe bearing clamping rod 17 and the probe linear bearing 18 are fixed together by interference fit and installed with the probe clamping rod 19. A spring is placed under the probe linear bearing 18 and on the lower step surface of the probe clamping rod 19. The stiffness test probe 20 is connected and fixed to the probe clamping rod 19 by a top screw; the rotary module and the test module are driven downward by the electric push rod, so that the stiffness test probe 20 is close to the test piece, and the test work can be carried out after the pressure generated by the compression of the spring reaches the specified value after continuing to move downward.

Claims

1. A rotor inner cavity bolt connection stiffness detection device, characterized in that: The rotor inner cavity bolt connection stiffness automatic detection equipment comprises a main frame, a clamping module, a lifting module, a rotation module and a probe test module, wherein the clamping module, the lifting module, the rotation module and the probe test module are all integrated on the main frame; The main frame comprises an upper connecting plate (3) of the frame, a lower connecting plate (13) of the frame, a guide rod clamping seat (23), a guide rod (24), a guide rod linear bearing clamping seat (27), a sliding spline shaft (43) and a spline sliding bearing (47); the connecting rod upper rotating shaft seat (4) and the connecting rod lower rotating shaft seat (12) are respectively fixed on the lower surface of the upper connecting plate (3) of the frame and the upper surface of the lower connecting plate (13) of the frame; the spline sliding bearing (47) is sleeved on the sliding spline shaft (43) and slides along the spline groove on the sliding spline shaft (43) to perform reciprocating linear motion, so that the spline sliding bearing (47) transmits torque while performing linear motion; the spline sliding bearing (47) is connected to the sliding spline shaft (43) by the spline groove on the sliding spline shaft (43). The upper bearing inner ring upper base (44) and the upper bearing inner ring lower base (45) in the rotary module are connected to drive the rotary module and the probe test module to reciprocate up and down along the sliding spline shaft (43) to complete the switching between the free state and the installed state; the guide rod linear bearing clamping seat (27) is fixed on the upper surface of the frame lower connecting plate (13), and the guide rod clamping seat (23) is fixed on the lower surface of the frame upper connecting plate (3); one end of the guide rod (24) is fixed in the guide rod linear bearing clamping seat (27), and the other end is fixed in the guide rod linear bearing clamping seat (27), and the three cooperate to realize the movement of the frame upper connecting plate (3) and the frame lower connecting plate (13) away from and approaching each other; The clamping module comprises an upper connecting rod rotating shaft seat (4), an upper connecting rod middle double rotating shaft (5), an upper connecting rod middle single rotating shaft (6), a lower connecting rod middle single rotating shaft (8), a lower connecting rod middle double rotating shaft (9), a lower connecting rod single rotating shaft (10), a lower connecting rod double rotating shaft (11), a lower connecting rod rotating shaft seat (12), an upper single rotating rod (21), an upper double rotating rod (22), a guide rod clamping seat (23), a lower single rotating rod (25), a lower double rotating rod (26), a circumferential clamping claw (7), an upper and lower steering gear mounting base (30), a lower steering gear (34), a lower coupling (36), a lead screw (37) and a lead screw nut (38); the driving parts of the clamping module are a lower steering gear (34) mounted on a connecting plate (3) on a frame through a steering gear mounting seat, and a lower steering gear (34) mounted on a connecting plate (3) on a frame through a steering gear mounting seat. The output shaft of the lower coupling (34), the lead screw (37) and the lead screw nut (38) are connected in sequence. The lead screw nut (38) is installed on the lower connecting plate (13) of the frame. By driving the output shaft of the lower steering gear (34) to rotate, the lead screw nut (38) is driven to move vertically along the axial direction, and the torsional moment is transmitted to the guide rod (24) between the upper connecting plate (3) and the lower connecting plate (13) of the frame, so that the circumferential clamping claw (7) connected by the three-link mechanism and the upper connecting plate (3) and the lower connecting plate (13) of the frame are approached or separated in a state of unchanged angular displacement, so that the circumferential clamping claw (7) is expanded or contracted, thereby clamping or loosening the inner diameter of the test piece and then performing the test work; The holes in the upper and lower parts of the circumferential clamping claw (7) are respectively matched with the holes of the upper single rotating rod (21), the upper double rotating rod (22), the lower single rotating rod (25) and the lower double rotating rod (26) through the upper double rotating shaft (5) in the connecting rod, the upper single rotating shaft (6) in the connecting rod, the lower single rotating shaft (8) in the connecting rod and the lower double rotating shaft (9) in the connecting rod by hole-shaft clearance, so that the large-angle rotation movement drives the contraction and expansion of the circumferential clamping claw (7). The upper single rotating rod (21) and the upper double rotating rod (22), the lower single rotating rod (25) and the lower double rotating rod (26) are respectively connected with the connecting rod upper rotating shaft seat (4) and the connecting rod lower rotating shaft seat (12) on the main frame by hole-shaft clearance. The contraction and expansion of the circumferential clamping claw (7) can drive the frame The upper connecting plate (3) and the lower connecting plate (13) of the frame move up and down; the upper single rotating rod (21), the upper double rotating rod (22), the lower single rotating rod (25), the lower double rotating rod (26) and the connecting rod upper rotating shaft seat (4) and the connecting rod lower rotating shaft seat (12) connected with the circumferential clamping claw (7) form a parallelogram structure, which can ensure that the circumferential clamping claw (7) is always parallel to the connecting rod upper rotating shaft seat (4) and the connecting rod lower rotating shaft seat (12), that is, the circumferential clamping claw (7) is always kept vertical, and the clamping module is unfolded or folded through the three-link mechanism. At the same time, the outer side surface of the circumferential clamping claw (7) is an arc surface of the same size as the inner diameter of the test piece, thereby ensuring that the force in the vertical direction is uniform with the inner diameter of the test piece in the clamped state;The lower steering gear (34), the upper and lower steering gear mounting seats 30, the lower coupling (36), the lead screw (37), the lead screw nut (38), the guide rod (24), the guide rod clamping seat (23), the guide rod linear bearing clamping seat (27), the upper connecting plate 3, and the lower connecting plate 13 constitute a lead screw slide mechanism. The lower steering gear (34) is fixed on the upper connecting plate (3) of the frame by using the upper and lower steering gear mounting seats 30. The lower steering gear (34) is connected to the lead screw (37) through the lower coupling (36) to transmit the torque provided by the lower steering gear (34) to the lead screw (37). The lead screw nut (38) is placed on the lower connecting plate (13) of the frame and is connected to the lead screw (37). The screw (37) cooperates to convert the torque acting on the screw nut (38) into an axial force, so that the lower connecting plate (13) of the frame moves axially, thereby controlling the expansion and contraction of the circumferential clamping claw (7) mechanism. At the same time, a guide rod (24), a guide rod clamping seat (23) and a guide rod linear bearing clamping seat (27) are arranged between the upper connecting plate (3) of the frame and the lower connecting plate (13) of the frame to prevent the torque from causing the angular displacement change of the upper connecting plate (3) of the frame and the lower connecting plate (13), thereby avoiding the deformation of the three-link mechanism causing the outer side surface of the circumferential clamping claw (7) to be improperly matched with the inner diameter contact surface of the test piece; The lifting module is located at the upper center of the rotor inner cavity bolt connection stiffness automatic detection equipment. It drives the modules mounted above through reciprocating lifting and lowering actions to realize the switching of the probe between different measuring points; the lifting module includes an upper bearing outer ring upper base (1), an upper bearing outer ring lower base (2), a frame upper connecting plate (3), a guide rod linear bearing clamping seat (27), an upper linear bearing upper base (28), an upper linear bearing lower base (29), an upper rotary bearing (46), a short guide rod (49), a sliding spline shaft (43), a spline sliding bearing (47), an upper bearing inner ring upper base (44), an upper bearing inner ring lower base (45), an electric push rod connector (3 9), an electric push rod center rod (40), an electric push rod mounting edge (41) and an electric push rod outer wall (42); wherein, an upper bearing outer ring upper base (1) and an upper bearing outer ring lower base (2) are respectively connected to an upper bearing inner ring upper base (44) and an upper bearing inner ring lower base (45) to provide structural support for an upper rotary bearing (46); an upper bearing outer ring lower base (2) and a frame upper connecting plate (3) are respectively connected to an upper linear bearing upper base (28) and an upper linear bearing lower base (29), and an upper linear bearing upper base (28) and a short guide rod (49) are fixed by an interference hole shaft fit, and an upper linear bearing lower base (29) is axially fixed by a clearance fit between the linear bearing and the short guide rod (49). The short guide rod (49) and the sliding spline shaft (43) respectively cooperate with the upper base (44) of the inner ring of the upper bearing and the lower base (45) of the inner ring of the upper bearing; the electric push rod is divided into an electric push rod installation edge (41) and an electric push rod outer wall (42), both of which are connected to the connecting plate (3) on the frame, and the electric push rod center rod (40) is further connected to the electric push rod connecting piece (39). The electric push rod center rod (40) provides power drive and structural support for the overall lifting of the lifting module; after the clamping module is clamped and fixed to the inner diameter of the test piece, in order to ensure that the test probe is placed in the correct position to complete the test, the rotary module and the probe test module need to be lifted and the test position adjusted. The driving component of this part is the electric The push rod, the electric push rod center rod (40) pushes up the lower base (2) of the upper bearing outer ring at a specified time, the upper base (1) of the upper bearing outer ring is connected to the upper connecting arm (14) of the probe by screws, the lower base (2) of the upper bearing outer ring pushes the upper base (1) of the upper bearing outer ring and then drives the upper connecting arm (14) of the probe to rise, the rotary module and the test mechanism test module move vertically along the axial direction under the guidance of the short guide rod (49) and the upper spline sliding bearing (47), thereby offsetting the overturning tendency caused by the position of the electric push rod, and after the test probe is adjusted to the specified position, the electric push rod center rod (40) is retracted again, so that the rotary module and the test module move downward, so that the test probe and the test piece are closely attached to complete the test work; The rotary module is responsible for realizing the circumferential rotation of the automatic detection device for the rigidity of the bolt connection of the rotor cavity; when the automatic detection device for the rigidity of the bolt connection of the rotor cavity is working, the rotary module enables the test probe to switch between different measuring points of the test piece and realizes precise rotation angle control; the rotary module includes a connecting plate (3) on the frame, an upper servo (33), an upper and lower servo mounting base (30), an upper servo mounting edge (31), an upper and lower servo mounting bottom edge (32), an upper coupling (48), a sliding spline shaft (43), The invention relates to a spline sliding bearing (47), an upper slewing bearing (46), an upper bearing inner ring upper base (44), an upper bearing inner ring lower base (45), an upper bearing outer ring upper base (1) and an upper bearing outer ring lower base (2); the frame upper connecting plate (3) is connected to the upper and lower steering gear mounting bases (30), the upper steering gear mounting edge (31) and the upper and lower steering gear mounting bottom edges (32) to provide structural support for the upper steering gear (33); the upper coupling (48) is connected to the sliding spline shaft (43), and the sliding spline shaft (43) is connected to the spline sliding bearing ( 47) forms a clearance fit to retain the vertical movement freedom of the rotary module and limit the vertical rotation freedom, so that the rotational movement of the upper steering gear (33) shaft drives the rotational movement of the upper bearing inner ring upper base (44) and the upper bearing inner ring lower base (45) fixed by interference fit with the spline sliding bearing (47); the upper connecting plate (3) of the frame uses the upper and lower steering gear mounting bases (30), the upper steering gear mounting edge (31), and the upper and lower steering gear mounting bottom edges (32) to fix the steering gear, and the upper connecting plate (3) of the frame is fixed by the upper linear bearing The upper base (28), the upper linear bearing lower base (29), the upper bearing outer ring upper base (1), and the upper bearing outer ring lower base (2) are fixed in the circumferential direction; the upper steering gear (33) is connected to the sliding spline shaft (43) through the upper coupling (48) to transmit the rotational motion provided by the upper steering gear (33) to the upper spline sliding bearing (47), and then to the upper bearing inner ring upper base (44) and the upper bearing inner ring lower base (45), driving the test module to rotate to complete the indexing action, so that the test probe is placed in the correct position to complete the test; The probe test module is arranged at the end of the probe upper connecting arm (14), equipped with a test probe, and realizes accurate positioning of the test probe, so as to ensure that a stable pressing force is maintained between the test probe and the test object during operation, and finally realizes the stability of the measurement structure; the probe test module comprises a probe upper connecting arm (14), a probe lower connecting arm (15), a probe arm clamping seat (16), a probe bearing clamping rod (17), a probe linear bearing (18), a probe clamping rod (19) and a stiffness test probe (20); the probe upper connecting arm (14) is connected to an upper bearing inner ring upper base (44), the probe arm clamping seat (16) uses a top screw to fix the probe bearing clamping rod (17), and the probe arm clamping seat (16) and the probe The clamping rod (19) is clearance-fitted. The probe clamping rod (19) is first moved radially and then fixed by a top screw, so that the stiffness test probe (20) can achieve fine adjustment of the radial length in the radial direction. The probe bearing clamping rod (17) and the probe linear bearing (18) are fixed together by interference fit and installed with the probe clamping rod (19). A spring is placed under the probe linear bearing (18) and on the lower step surface of the probe clamping rod (19). The stiffness test probe (20) and the probe clamping rod (19) are connected and fixed by a top screw. The rotary module and the test module are driven downward by an electric push rod, so that the stiffness test probe (20) is closely attached to the test piece. After the pressure generated by the compression of the spring reaches a specified value when the probe is further moved downward, the test work can be carried out.

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