Powder metallurgy gear meshing precision detector

Abstract

The present application relates to gear precision detection field, specifically to powder metallurgy gear meshing precision detector, including vibration detection part, for detecting the exciting force generated in the process of gear meshing, and then judging the meshing precision, the outside of vibration detection part is provided with a bevel gear, the bottom of the bevel gear is engaged with transmission with the second bevel gear, and the two constitute meshing detection pair, drive part, set in the bottom of the second bevel gear, for driving the second bevel gear rotation, and the second bevel gear is fixed in position, guarantee the stability of meshing transmission, the vibration detection part includes rigid sleeve and vibration detector, the vibration detector is fixedly installed on the outside of rigid sleeve, the powder metallurgy gear meshing precision detector, through the triple matching structure of thread barrel and connecting shaft thread connection, butt joint plate and plug rod gap plug-in, round member and groove sliding limit, multiple locking is formed to the first bevel gear.

Description

Technical Field

[0001] This invention relates to the field of gear precision testing technology, specifically to a powder metallurgy gear meshing precision testing instrument. Background Technology

[0002] In the production and quality inspection of powder metallurgy gears and precision transmission components, the meshing accuracy, transmission smoothness, and vibration and noise levels of bevel gear pairs are core indicators for evaluating product quality. During the meshing transmission process, factors such as tooth surface accuracy, assembly clearance, coaxiality error, and axial movement of bevel gears are directly converted into vibration signals. By collecting, analyzing, and judging the meshing vibration signals, it is possible to quickly evaluate the gear machining quality, assembly accuracy, and transmission performance.

[0003] Existing testing devices mostly use single keys, threads, or simple clamping methods to fix the bevel gears under test. Under high-speed rotation and meshing impact, they are prone to loosening, shifting, or even falling off, directly introducing false vibration signals, resulting in distorted test data and poor repeatability. Vibration sensors are mostly directly installed on rotating parts or weakly rigid supports. The vibration of the motor, bearings, and couplings themselves will be superimposed with the meshing vibration, making it impossible to separate the real excitation signal, resulting in low detection accuracy and poor signal-to-noise ratio. Summary of the Invention

[0004] The present invention provides a powder metallurgy gear meshing accuracy testing instrument to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a powder metallurgy gear meshing accuracy tester, including a vibration detection unit for detecting the excitation force generated during gear meshing, thereby determining the meshing accuracy; a first bevel gear is provided on the outer side of the vibration detection unit, and a second bevel gear is meshed and driven at the bottom of the first bevel gear, the two forming a meshing detection pair; The drive unit is located at the bottom of the second bevel gear and is used to drive the second bevel gear to rotate and to fix the second bevel gear in a tight position to ensure the stability of the meshing transmission. The vibration detection unit includes a rigid sleeve and a vibration detector. The vibration detector is fixedly installed on the outside of the rigid sleeve and is used to collect and feedback the excitation force signal generated by the meshing of the first bevel gear and the second bevel gear.

[0006] Preferably, a placement plate is provided at the bottom of the vibration detection unit, the placement plate being used to support the vibration detection unit; a hydraulic cylinder is fixedly installed at the bottom of the placement plate, used to adjust the height of the placement plate and the vibration detection unit, adapting to gear meshing clearance adjustment; a sliding plate is fixedly installed at the bottom of the hydraulic cylinder, used to realize overall displacement adjustment.

[0007] Preferably, the bottom of the drive unit is provided with a support platform, which serves as the support base for the entire device; a fixed rail is fixedly installed on the top of the support platform, and the top of the fixed rail is adapted to slide with the slide plate. An electric push rod is fixedly installed on the outer side of the support platform. The output end of the electric push rod is fixedly connected to the slide plate and is used to drive the slide plate to move along the fixed rail and adjust the relative position of the vibration detection unit and the drive unit.

[0008] Preferably, the vibration detection unit further includes a hollow frame, a No. 1 motor, a connecting shaft, a No. 1 bearing, and a rigid sleeve; the hollow frame is fixedly installed on the top of the placement plate to provide an installation base for the No. 1 motor; The No. 1 motor is fixedly installed inside the hollow frame, and its output end is fixedly connected to the connecting shaft through a coupling to drive the connecting shaft to rotate; the No. 1 bearing is fixedly connected to the outside of the connecting shaft, and its outer ring is squeezed and fitted with the inner wall of the rigid sleeve to realize the rotational support and positioning of the rigid sleeve.

[0009] Preferably, the end of the connecting shaft away from the coupling is provided with an external thread, and a groove is opened at this end. The round handle is slidably adapted to the inside of the groove, and a plug rod is fixedly connected to the outside of the round handle. The fitting plates are respectively fitted to the outer sides of the round handle and the insert rod, and are also slidably fitted to the inside of the groove, which is used to limit and fix the round handle and the insert rod, and ensure the stability of the connection between the two and the connecting shaft.

[0010] Preferably, the connecting ring is fixedly connected to the inside of the insert rod, and the shaft is pressed and adapted to the inner wall of the connecting ring to achieve rotational support of the shaft; the outer end face of the shaft is fixedly connected to the first bevel gear, driving the first bevel gear to rotate synchronously; The top and bottom of the insertion rod are provided with notches to provide a base for insertion and positioning, so as to realize the linkage of components.

[0011] Preferably, the threaded cylinder is threaded to the outside of the coupling shaft, and a groove is provided on the outer end face of the threaded cylinder. The locking plate is slidably adapted to the groove, and its end away from the threaded cylinder is fitted with the rigid sleeve and fastened by bolts to realize the fixed linkage between the threaded cylinder and the rigid sleeve. The threaded cylinder has a vertical groove on its outer side. The telescopic rod is fixedly installed at the top of the vertical groove cavity, and its bottom end is fixedly connected to the slide bar. The slide bar slides and adapts to the inside of the vertical groove. A mating plate is fixedly connected to the bottom of the slide bar. The mating plate is inserted and adapted to the notch to realize the linkage positioning of the threaded cylinder and the insert rod.

[0012] Preferably, the drive unit includes a support rod, a second motor, a square plate, a fixed platform, and a rotating shaft; the bottom of the support rod is fixedly connected to the support platform to provide support for the drive unit; The second motor is fixedly installed inside the support rod, the square plate is fixedly installed at the top of the support rod, and the fixed platform is fixedly installed at the center of the square plate; the rotating shaft is rotatably installed inside the fixed platform, its top end is fixedly connected to the second bevel gear, and its bottom end is fixedly connected to the output end of the second motor through a coupling; the second motor drives the rotating shaft to rotate, which drives the second bevel gear to rotate synchronously, realizing the meshing transmission with the first bevel gear.

[0013] Preferably, the fixed platform has an inner sliding groove inside, and the upper and lower ends of the inner sliding groove have a first annular groove and a second annular groove, respectively, to provide a sliding limit base; the sliding sleeve is slidably adapted to the inside of the inner sliding groove; A spring is fixedly connected to the top of the sliding sleeve. An outer sleeve is fixedly connected to the end of the spring away from the sliding sleeve. The top of the outer sleeve is fixedly connected to the second bevel gear. A mating strip is fixedly connected to the outer side of the outer sleeve. A second bearing is fixedly connected to the end of the mating strip away from the outer sleeve. An elastic sleeve is fixedly connected to the bottom of the outer ring of the second bearing.

[0014] Preferably, a slot is provided on the outer side of the fixed platform, and an L-shaped rod is slidably fitted in the slot. A return spring is fixedly connected to the outer side of the L-shaped rod, and the end of the return spring away from the L-shaped rod is fixedly connected to the outer side of the fixed platform. The L-shaped rod has a short shaft fixedly connected inside, and a rotating block is rotatably installed on the outside of the short shaft. The bottom of the rotating block is squeezed and adapted to the elastic sleeve, and a connecting strip is fixedly connected to the outside of the rotating block.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The vibration detection section employs a triple-locking structure: a threaded cylinder connected to a threaded shaft, a mating plate and a notched insert, and a round handle and a sliding limit mechanism in the groove. This structure provides multiple locking mechanisms for the No. 1 bevel gear. This design effectively prevents axial movement or disengagement of the bevel gear during high-speed rotation, ensuring a smooth and reliable transmission process.

[0016] 2. The rigid sleeve is isolated from the rotating coupling by bearings, allowing the vibration detector to collect only the excitation force generated by gear meshing, without interference from the rotational vibration of the coupling. This fundamentally isolates the interference source, ensuring that the collected vibration signal truly reflects the gear meshing state, greatly improving the accuracy and reliability of the test data.

[0017] 3. The drive unit achieves unidirectional limiting and locking of the second bevel gear through the cooperation of a deflectable rotating block and an elastic sleeve. When the gear rotates in the opposite direction, causing the elastic sleeve to press against the rotating block, stable support is formed; when it rotates in the opposite direction, the elastic sleeve can smoothly reset. This structure improves the rotational stability of the bevel gear while avoiding the risk of jamming caused by bidirectional locking, thus optimizing the dynamic operating performance of the gear. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of the powder metallurgy gear meshing accuracy testing instrument of the present invention.

[0019] Figure 2 This is a schematic diagram of the fixed rail structure in the powder metallurgy gear meshing accuracy testing instrument of the present invention.

[0020] Figure 3 This is a schematic diagram of the vibration detection unit of the present invention.

[0021] Figure 4 This is a cross-sectional structural schematic diagram of the vibration detection unit of the present invention.

[0022] Figure 5 This is a cross-sectional view of the rigid sleeve in the vibration detection unit of the present invention.

[0023] Figure 6 This is an enlarged structural schematic diagram of the docking plate in the vibration detection unit of the present invention.

[0024] Figure 7 This is an enlarged structural schematic diagram of the interlocking plate in the vibration detection unit of the present invention.

[0025] Figure 8 This is an enlarged schematic diagram of the connecting shaft in the vibration detection unit of the present invention.

[0026] Figure 9 This is a schematic diagram of the drive unit of the present invention.

[0027] Figure 10 This is a cross-sectional view of the fixed platform in the drive unit of the present invention.

[0028] Figure 11 This is a cross-sectional view of the rotating shaft in the drive unit of the present invention.

[0029] Figure 12 This is a cross-sectional view of the L-shaped rod in the drive unit of the present invention.

[0030] Figure 13 This is a cross-sectional enlarged structural diagram of the transfer block in the drive unit of the present invention.

[0031] In the diagram: 1. Support platform; 2. Hydraulic cylinder; 3. Placement plate; 4. Vibration detection unit; 5. First bevel gear; 6. Drive unit; 7. Second bevel gear; 8. Electric push rod; 9. Slide plate; 10. Fixed rail; 41. Hollow frame; 42. Motor No. 1; 43. Coupling shaft; 44. Bearing No. 1; 45. Rigid sleeve; 46. Vibration detector; 47. Groove; 48. Round handle; 49. Insert rod; 40. Connecting ring; 401. Notch; 402. Shaft; 403. Fitting plate; 404. Threaded cylinder; 405. Clamping plate; 406. Vertical groove; 407. Telescopic rod; 408. Sliding bar; 409. Butt joint plate; 61. Support rod; 62. Motor No. 2; 63. Square plate; 64. Fixed platform; 65. Rotating shaft; 66. Inner sliding groove; 67. No. 1 annular groove; 68. Sliding sleeve; 69. Spring; 60. Outer sleeve; 601. No. 2 annular groove; 602. Connecting bar; 603. No. 2 bearing; 604. Elastic sleeve; 605. L-shaped rod; 606. Return spring; 607. Short shaft; 608. Rotating block; 609. Connecting bar. Detailed Implementation

[0032] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. It should be understood that the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1 to 13 The present invention provides a technical solution: Example 1, such as Figure 1 and Figure 2 As shown, the support platform 1 is made of high-strength rigid material, and a fixed rail 10 is fixedly installed on the top by welding. The fixed rail 10 is arranged in the horizontal direction to provide a sliding carrier for the slide plate 9 and realize the overall displacement adjustment; the top of the fixed rail 10 is adapted to slide with the slide plate 9.

[0034] An electric push rod 8 is fixedly installed on the outer side of the support platform 1 by welding. The output end of the electric push rod 8 is fixedly connected to the slide plate 9 by bolts. It is used to drive the slide plate 9 to move horizontally along the fixed rail 10, thereby adjusting the relative position of the vibration detection unit 4 and the drive unit 6 to meet the adjustment requirements of the gear meshing clearance. A hydraulic cylinder 2 is fixedly installed on the top of the slide plate 9 by welding. The hydraulic cylinder 2 is arranged in the vertical direction and is used to adjust the height of the placement plate 3 and the vibration detection unit 4 to further meet the gear meshing clearance adjustment and ensure that the first bevel gear 5 and the second bevel gear 7 can mesh accurately. A placement plate 3 is fixedly installed on the top of the hydraulic cylinder 2 by welding. The placement plate 3 has a horizontal plate structure and is used to support the vibration detection unit 4, providing a stable installation foundation for the vibration detection unit 4.

[0035] Example 2, as follows Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the hollow frame 41 is fixedly installed on the top of the placement plate 3 by welding, forming a frame structure, providing a stable installation base for the No. 1 motor 42; the No. 1 motor 42 is fixedly installed inside the hollow frame 41 by bolts, and its output end is fixedly connected to the connecting shaft 43 through a coupling, which is used to drive the connecting shaft 43 to rotate, thereby driving the subsequent components to rotate synchronously; the outer side of the connecting shaft 43 is connected to the No. 1 bearing 44 by interference fit, and the outer ring of the No. 1 bearing 44 is squeezed and fitted with the inner wall of the rigid sleeve 45 to realize the support and positioning of the rigid sleeve 45, ensuring that the rigid sleeve 45 does not rotate with the connecting shaft 43. Its only function is to transmit the vibration force to the vibration detector 46.

[0036] The rigid sleeve 45 has a ring structure and is sleeved on the outside of the first bearing 44. It is linked with the connecting shaft 43 through the first bearing 44. A vibration detector 46 is fixedly installed on the outside of the rigid sleeve 45 by bolts. The vibration detector 46 is tightly connected to the rigid sleeve 45 and is used to collect and feed back the excitation force signal generated by the meshing of the first bevel gear 5 and the second bevel gear 7. It converts the vibration signal into an electrical signal and provides data support for judging the meshing accuracy.

[0037] The end of the coupling 43 furthest from the coupling is provided with an external thread for threaded connection with the threaded cylinder 404. This end also has an L-shaped groove 47 to accommodate the round handle 48 and provide it with sliding and rotational space. The round handle 48 slides within the groove 47, extending into the horizontal groove and rotating in the vertical groove to adjust its position. A welding rod 49 is fixedly connected to the outer side of the round handle 48. The welding rod 49 moves synchronously with the round handle 48 to connect the shaft 402 and the first bevel gear 5. The round handle 48 is composed of a disc and a handle. The size of the disc is the same as the cross-sectional size of the welding rod 49, and the length of the handle is the same as the length of the groove 47.

[0038] The fitting plate 403 is fitted to the outer side of the round handle 48 and the insert rod 49 respectively, and is slidably fitted to the inside of the groove 47. It is used to limit and fix the round handle 48 and the insert rod 49 to prevent them from moving or rotating in the connecting shaft 43, and to ensure the stability of the connection between the two and the connecting shaft 43. The insert rod 49 is fixedly connected to the inside by an interference fit with a connecting ring 40. The inner wall of the connecting ring 40 is squeezed and fitted to the shaft 402 to realize the rotational support of the shaft 402 and ensure that the shaft 402 can rotate smoothly without jamming. The outer end face of the shaft 402 is fixedly connected to the first bevel gear 5 by welding, which can drive the first bevel gear 5 to rotate synchronously and realize the meshing transmission with the second bevel gear 7.

[0039] The top and bottom of the insertion rod 49 are provided with notches 401 to provide a base for insertion and positioning, so as to achieve the adaptation with the mating plate 409 and thus realize the linkage of components; the threaded cylinder 404 is threaded to the outside of the connecting shaft 43 and precisely matches the external thread of the connecting shaft 43. It can be tightened and separated from the connecting shaft 43 by rotation. The threaded cylinder 404 completely wraps the groove 47 on the outside of the connecting shaft 43, so as to achieve the positioning of the mating plate 403 and the dual limiting of the insertion rod 49.

[0040] The outer end face of the threaded cylinder 404 is provided with a groove for accommodating the locking plate 405. The locking plate 405 is slidably fitted into the groove and its position can be adjusted along the groove. The end of the locking plate 405 away from the threaded cylinder 404 is engaged with the rigid sleeve 45 and is fastened by bolts to achieve a fixed connection between the locking plate 405 and the rigid sleeve 45. The outer side of the threaded cylinder 404 is provided with a vertical groove 406, which is arranged along the vertical direction of the threaded cylinder 404 and is used to install the telescopic rod 407 and the slide bar 408.

[0041] The telescopic rod 407 is fixedly installed at the top of the inner cavity of the vertical groove 406 by bolts, and its bottom end is fixedly connected to the slide bar 408 by welding. It can stretch and contract as the slide bar 408 moves. The slide bar 408 slides and adapts to the inside of the vertical groove 406, and the gap with the inner wall of the vertical groove 406 is precisely matched, so it can slide smoothly up and down along the vertical groove 406. The bottom of the slide bar 408 is fixedly connected to the butt plate 409 by welding. The butt plate 409 is inserted into the notch 401 and can realize the linkage positioning of the threaded cylinder 404 and the insert rod 49 by inserting into the notch 401. At the same time, it forms a clamping limit on the connecting ring 40 to prevent it from axially dislodging.

[0042] Inside the vibration detection unit 4, only the hollow frame 41, motor 42, rigid sleeve 45, vibration detector 46, and locking plate 405 are fixed components, while the rest of the components are driven to rotate by the coupling shaft 43.

[0043] During operation, the mating plate 409 on the threaded cylinder 404 provides a locking position for the insertion rod 49, the round handle 48 on the insertion rod 49 provides a sliding locking position for the connecting shaft 43, and the threaded connection between the threaded cylinder 404 and the outer side of the connecting shaft 43 provides a threaded connection locking position. These three elements work together and lock in place, preventing the first bevel gear 5 from axially disengaging during rotation. Simultaneously, this structure effectively suppresses vibrations caused by structural response during the rotation of the connecting shaft 43, reducing interference from the bevel gear meshing process on vibration detection accuracy and improving detection stability and accuracy.

[0044] Example 3, as follows Figure 1 , Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13As shown, the bottom of the strut 61 is fixedly connected to the support platform 1 by welding to provide stable support for the drive unit 6; the second motor 62 is fixedly installed inside the strut 61 by bolts to provide driving power; the square plate 63 is fixedly installed at the top of the strut 61 by welding, and has a horizontal plate structure for mounting the fixing platform 64; the fixing platform 64 is fixedly installed at the center of the square plate 63 by welding to mount the rotating shaft 65 and related stabilizing components.

[0045] The rotating shaft 65 is rotatably mounted inside the fixed platform 64 via bearings and can rotate smoothly around its own axis. The top of the rotating shaft 65 is fixedly connected to the second bevel gear 7 by welding, and the bottom is fixedly connected to the output end of the second motor 62 via a coupling. The rotating shaft 65 is driven to rotate by the second motor 62, which can drive the second bevel gear 7 to rotate synchronously, realizing the meshing transmission with the first bevel gear 5. The meshing transmission of the first bevel gear 5 and the second bevel gear 7 constitutes a meshing detection pair, which is used to simulate the meshing state of powder metallurgy gears and generate excitation force for the vibration detector 46 to collect.

[0046] The fixed platform 64 has an inner sliding groove 66 inside, which has a flower-shaped structure. It is used to provide a sliding limit base for the sliding sleeve 68 and prevent the sliding sleeve 68 from rotating circumferentially. The upper and lower ends of the inner sliding groove 66 are respectively provided with a first annular groove 67 and a second annular groove 601. The first annular groove 67 is used to accommodate the sliding sleeve 68 and realize its circumferential rotation. The second annular groove 601 is used to accommodate the sliding sleeve 68 for rotation and limit it, preventing it from moving too far downward. The sliding sleeve 68 slides and fits into the interior of the inner sliding groove 66, and the gap between it and the inner wall of the inner sliding groove 66 is precisely matched. It can slide up and down along the inner sliding groove 66, but cannot rotate circumferentially.

[0047] When the spring 69 is compressed and drives the sliding sleeve 68 into the first annular groove 67, the circumferential constraint between the sliding sleeve 68 and the inner sliding groove 66 is released, and the sliding sleeve 68 will rotate synchronously with the outer sleeve 60 under the torque of the spring 69.

[0048] The function of the second annular groove 601 is: when the second bevel gear 7 rotates counterclockwise, the sliding sleeve 68 can rotate synchronously with the outer sleeve 60 in the second annular groove 601. At this time, the elastic sleeve 604 and the L-shaped rod 605 remain stationary, so that the second bevel gear 7 can perform vibration detection in this state.

[0049] A spring 69 is fixedly connected to the top of the sliding sleeve 68 by welding. The end of the spring 69 away from the sliding sleeve 68 is fixedly connected to the outer sleeve 60 by welding. The outer sleeve 60 has a ring structure and is fitted on the outside of the rotating shaft 65. The top of the outer sleeve 60 is fixedly connected to the second bevel gear 7 by welding and can rotate synchronously with the second bevel gear 7 and the rotating shaft 65. A mating strip 602 is fixedly connected to the outside of the outer sleeve 60 by welding. The mating strip 602 is arranged radially along the outer sleeve 60 and is used to connect the second bearing 603. The end of the mating strip 602 away from the outer sleeve 60 is fixedly connected to the inner ring of the second bearing 603 by interference fit, thereby fixing the second bearing 603. An elastic sleeve 604 is fixedly connected to the bottom of the outer ring of the second bearing 603 by welding. The elastic sleeve 604 has good elasticity and is used to limit and lock the second bevel gear 7, thereby improving its rotational stability.

[0050] A slot is provided on the outer side of the fixed platform 64. The slot is arranged radially along the fixed platform 64. An L-shaped rod 605 is slidably fitted inside the slot. The gap between the L-shaped rod 605 and the inner wall of the slot is precisely matched, and it can slide inside and outside the slot. A return spring 606 is fixedly connected to the outer side of the L-shaped rod 605 by welding. The end of the return spring 606 away from the L-shaped rod 605 is fixedly connected to the outer side of the fixed platform 64 by welding. It is used to reset the L-shaped rod 605. When the pressure is removed, it drives the L-shaped rod 605 to reset to the initial position. A short shaft 607 is fixedly connected to the inside of the L-shaped rod 605 by welding. The short shaft 607 is arranged in the horizontal direction and is used to install the rotating block 608.

[0051] The mating part between the rotating block 608 and the short shaft 607 is provided with several friction protrusions, preventing the rotating block 608 from rotating freely relative to the short shaft 607 without external force. The static friction force formed between the protrusion and the outer wall of the short shaft 607 is greater than the squeezing force of the elastic sleeve 604 on the rotating block 608, thus ensuring that the elastic sleeve 604 cannot drive the rotating block 608 to rotate around the short shaft 607. The rotating block 608 can only rotate around the short shaft 607 when the operator applies force manually. The bottom of the rotating block 608 is squeezed and fitted with the elastic sleeve 604 to limit and lock the elastic sleeve 604. A connecting strip 609 is fixedly connected to the outside of the rotating block 608 by welding to assist the synchronous rotation of several rotating blocks 608. This ensures that when the operator rotates one rotating block 608 to the other side, the remaining rotating blocks 608 will rotate synchronously, and the elastic sleeve 604 will disengage from the rotating block 608 under elastic force.

[0052] When the rotating block 608 deflects to the right, it is arranged in the opposite direction to the elastic sleeve 604. At this time, the elastic sleeve 604 can move smoothly to the right along the bottom of the L-shaped rod 605 and the rotating block 608. However, when the elastic sleeve 604 moves in the opposite direction, it will be limited and blocked by the rotating block 608 and cannot move to the left to reset. Correspondingly, when the rotating block 608 deflects to the left, the elastic sleeve 604 can be smoothly reset to the left along the bottom of the rotating block 608 and the L-shaped rod 605 under the action of its own elastic force.

[0053] Furthermore, during the upward movement of the sliding sleeve 68, a radially outward compressive force is generated on the L-shaped rod 605, driving the L-shaped rod 605 to move outward. When the sliding sleeve 68 moves into the first annular groove 67, the compressive force is released, and the return spring 606 pulls the L-shaped rod 605 to reset. During the reset process, the rotating block 608, which is in a right-deflected state, pulls the elastic sleeve 604, which is limited by it, to move towards the center. As the second bevel gear 7 rotates clockwise, the tensioning effect of the elastic sleeve 604 improves its operational stability.

[0054] The working principle of this invention is as follows: First, the round handle 48 is placed horizontally and inserted into the center hole of the connecting shaft 43 together with the fixedly connected insertion rod 49; at the same time, the round handle 48 extends into the interior of the connecting shaft 43 along the horizontal groove of the groove 47 until it reaches the innermost side of the groove 47. Then, the insertion rod 49 is rotated clockwise to change the round handle 48 from a horizontal to a vertical state, and then the fitting plate 403 is inserted into the remaining cavity of the groove 47 to complete the pre-fixation of the insertion rod 49.

[0055] The threaded cylinder 404 is screwed into the outer thread of the connecting shaft 43. The threaded cylinder 404 completely encloses the groove 47 on the outer side of the connecting shaft 43, achieving positioning of the fitting plate 403 and dual limiting of the insertion rod 49. After the threaded cylinder 404 is fully screwed into the connecting shaft 43, the mating plate 409 and the notch 401 are aligned vertically. The operator simultaneously presses the sliding strip 408 towards the center and stretches the telescopic rod 407, so that the mating plate 409 extends into the notch 401, forming a clamping limit on the connecting ring 40 and preventing it from axially dislodging.

[0056] A locking plate 405 is rotatably mounted on the outer end face of the threaded cylinder 404. As the threaded cylinder 404 and the connecting shaft 43 are screwed together, the locking plate 405 gradually fits into the rigid sleeve 45. Finally, the two are fastened together by bolts to achieve overall connection and locking.

[0057] The hydraulic cylinder 2 and the electric push rod 8 are started simultaneously to move the vibration detection unit 4 and the first bevel gear 5 to the set position, so that the first bevel gear 5 and the second bevel gear 7 are in the meshing position; then the first motor 42 is started, and the coupling shaft 43 is driven to rotate through the coupling, which in turn drives the threaded cylinder 404, the insert rod 49 and the first bevel gear 5 to rotate synchronously in the forward direction. Then the vibration detector 46 receives and processes the vibration generated when the two gears mesh.

[0058] When motor 62 is started, its output end drives shaft 65 to rotate in the forward direction via a coupling. Bevel gear 7, connected to the top of shaft 65, rotates accordingly and meshes with bevel gear 5. The outer sleeve 60, fixed to the bottom of bevel gear 7, drives spring 69 to rotate synchronously. The other end of spring 69 is fixed to sliding sleeve 68, which slides within the inner groove 66 of the flower-shaped structure. Unable to rotate circumferentially with spring 69, spring 69 contracts under torsion, increasing its inner diameter and driving sliding sleeve 68 upward along the inner groove 66 until it enters annular groove 67. At this point, sliding sleeve 68 can rotate synchronously with spring 69 and shaft 65.

[0059] When the sliding sleeve 68 moves upward, its top end face presses against the L-shaped rod 605, causing the L-shaped rod 605 to stretch the return spring 606 and extend outward. During the outward movement of the L-shaped rod 605, the rotating block 608 installed inside it via the short shaft 607 moves outward synchronously, thereby forming a pressing engagement with the elastic sleeve 604. The bottom of the elastic sleeve 604 will pass over each layer of rotating blocks 608 from top to bottom, and during this process, it will be forced to stretch downward, and finally be limited and locked by the bottommost rotating block 608.

[0060] The No. 2 bearing 603, which is fixed at the top of the elastic sleeve 604, is subjected to a downward pulling force. Through the mating strip 602, which is fixed to the inner ring of the No. 2 bearing 603, the pulling force is transmitted to the rotating shaft 65 and the No. 2 bevel gear 7, which significantly improves the stability of the No. 2 bevel gear 7 during rotation and effectively suppresses radial sway.

[0061] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made by those skilled in the art based on the above concepts without creative effort shall fall within the scope of protection of the present invention.

Claims

1. A powder metallurgy gear meshing accuracy testing instrument, characterized in that, include: The vibration detection unit is used to detect the excitation force generated during gear meshing, thereby determining the meshing accuracy; A first bevel gear is provided on the outer side of the vibration detection unit, and a second bevel gear is engaged at the bottom of the first bevel gear, forming a meshing detection pair. The drive unit is located at the bottom of the second bevel gear and is used to drive the second bevel gear to rotate and to fix the second bevel gear in a tight position to ensure the stability of the meshing transmission. The vibration detection unit includes a bearing, a coupling, a rigid sleeve, and a vibration detector. The vibration detector is fixedly installed on the outside of the rigid sleeve and is used to collect and feedback the excitation force signal generated by the meshing of the first bevel gear and the second bevel gear. The connecting ring is fixedly connected to the inside of the insert rod, and the shaft is pressed and fitted to the inner wall of the connecting ring to achieve rotational support of the shaft; the outer end face of the shaft is fixedly connected to the No. 1 bevel gear, driving the No. 1 bevel gear to rotate synchronously. The No. 1 bearing is fixedly connected to the outside of the connecting shaft, and its outer ring is squeezed and fitted with the inner wall of the rigid sleeve to realize the rotational support and positioning of the rigid sleeve. The drive unit includes a second motor, a fixed platform, and a rotating shaft; The rotating shaft is rotatably installed inside the fixed platform. Its top end is fixedly connected to the second bevel gear, and its bottom end is fixedly connected to the output end of the second motor through a coupling. The second motor drives the rotating shaft to rotate, which in turn drives the second bevel gear to rotate synchronously, thereby achieving meshing transmission with the first bevel gear. The fixed platform has an inner sliding groove, and the sliding sleeve is slidably adapted to the inside of the inner sliding groove; The fixed platform has a slot on its outer side, and an L-shaped rod is slidably fitted inside the slot. A short shaft is fixedly connected inside the L-shaped rod, and a rotating block is rotatably installed on the outer side of the short shaft. The bottom of the rotating block is squeezed and fitted with an elastic sleeve. A spring is fixedly connected to the top of the sliding sleeve, and an outer sleeve is fixedly connected to the end of the spring away from the sliding sleeve. The top of the outer sleeve is fixedly connected to the second bevel gear, and a mating strip is fixedly connected to the outer side of the outer sleeve. A second bearing is fixedly connected to the end of the mating strip away from the outer sleeve, and the bottom of the outer ring of the second bearing is fixedly connected to the elastic sleeve. The fitting plate is fitted to the outer side of the round handle and the insert rod respectively, and slides to fit inside the groove, which is used to limit and fix the round handle and the insert rod, and ensure the stability of the connection between the two and the connecting shaft. The threaded sleeve is threaded onto the outside of the coupling; The threaded cylinder has a vertical groove on its outer side, and a slide bar is slidably fitted inside the vertical groove. A mating plate is fixedly connected to the bottom of the slide bar, and the mating plate is inserted into the notch to realize the linkage positioning of the threaded cylinder and the insert rod.

2. The powder metallurgy gear meshing accuracy testing instrument according to claim 1, characterized in that: The bottom of the vibration detection unit is provided with a placement plate, which is used to support the vibration detection unit; a hydraulic cylinder is fixedly installed at the bottom of the placement plate, which is used to adjust the height of the placement plate and the vibration detection unit and to adapt to the gear meshing clearance adjustment; a sliding plate is fixedly installed at the bottom of the hydraulic cylinder, which is used to realize the overall displacement adjustment.

3. The powder metallurgy gear meshing accuracy testing instrument according to claim 2, characterized in that: The bottom of the drive unit is provided with a support platform, which serves as the support base for the entire device; a fixed rail is fixedly installed on the top of the support platform, and the top of the fixed rail is adapted to slide with the slide plate. An electric push rod is fixedly installed on the outer side of the support platform. The output end of the electric push rod is fixedly connected to the slide plate and is used to drive the slide plate to move along the fixed rail and adjust the relative position of the vibration detection unit and the drive unit.

4. The powder metallurgy gear meshing accuracy testing instrument according to claim 2, characterized in that: The vibration detection unit also includes a hollow frame and a No. 1 motor; the hollow frame is fixedly installed on the top of the placement plate to provide a mounting base for the No. 1 motor; The No. 1 motor is fixedly installed inside the hollow frame, and its output end is fixedly connected to the connecting shaft through a coupling to drive the connecting shaft to rotate.

5. The powder metallurgy gear meshing accuracy testing instrument according to claim 4, characterized in that: The end of the connecting shaft away from the coupling is provided with an external thread, and a groove is opened at this end. The round handle is slidably adapted to the inside of the groove, and a plug rod is fixedly connected to the outside of the round handle.

6. The powder metallurgy gear meshing accuracy testing instrument according to claim 5, characterized in that: The top and bottom of the insertion rod are provided with notches to provide a base for insertion and positioning, so as to realize the linkage of components.

7. The powder metallurgy gear meshing accuracy testing instrument according to claim 4, characterized in that: The outer end face of the threaded cylinder is provided with a groove, and the locking plate is slidably adapted to the groove. The end of the locking plate away from the threaded cylinder is engaged with the rigid sleeve and is fastened by bolts to realize the fixed linkage between the threaded cylinder and the rigid sleeve. The telescopic rod is fixedly installed at the top of the vertical groove cavity, and its bottom end is fixedly connected to the slide bar.

8. The powder metallurgy gear meshing accuracy testing instrument according to claim 1, characterized in that: The drive unit also includes a support rod and a square plate; the bottom of the support rod is fixedly connected to the support platform to provide support for the drive unit. The second motor is fixedly installed inside the support rod, the square plate is fixedly installed at the top of the support rod, and the fixed platform is fixedly installed at the center of the square plate.

9. The powder metallurgy gear meshing accuracy testing instrument according to claim 8, characterized in that: The inner sliding groove has a first annular groove and a second annular groove at its upper and lower ends, respectively, to provide a sliding limit base.

10. The powder metallurgy gear meshing accuracy testing instrument according to claim 9, characterized in that: A return spring is fixedly connected to the outer side of the L-shaped rod, and the end of the return spring away from the L-shaped rod is fixedly connected to the outer side of the fixed platform. A connecting strip is fixedly connected to the outer side of the rotating block.

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